diff --git a/src/meshcore_hub/__main__.py b/src/meshcore_hub/__main__.py
index 81d5b45..fd8464d 100644
--- a/src/meshcore_hub/__main__.py
+++ b/src/meshcore_hub/__main__.py
@@ -32,71 +32,11 @@ def cli(ctx: click.Context, log_level: str) -> None:
 # Import and register component CLIs
 from meshcore_hub.interface.cli import interface
 from meshcore_hub.collector.cli import collector
+from meshcore_hub.api.cli import api
 
 cli.add_command(interface)
 cli.add_command(collector)
-
-
-@cli.command()
-@click.option(
-    "--host",
-    type=str,
-    default="0.0.0.0",
-    envvar="API_HOST",
-    help="API server host",
-)
-@click.option(
-    "--port",
-    type=int,
-    default=8000,
-    envvar="API_PORT",
-    help="API server port",
-)
-@click.option(
-    "--database-url",
-    type=str,
-    default="sqlite:///./meshcore.db",
-    envvar="DATABASE_URL",
-    help="Database connection URL",
-)
-@click.option(
-    "--read-key",
-    type=str,
-    default=None,
-    envvar="API_READ_KEY",
-    help="Read-only API key",
-)
-@click.option(
-    "--admin-key",
-    type=str,
-    default=None,
-    envvar="API_ADMIN_KEY",
-    help="Admin API key",
-)
-@click.option(
-    "--reload",
-    is_flag=True,
-    default=False,
-    help="Enable auto-reload for development",
-)
-def api(
-    host: str,
-    port: int,
-    database_url: str,
-    read_key: str | None,
-    admin_key: str | None,
-    reload: bool,
-) -> None:
-    """Run the REST API server.
-
-    Provides REST API endpoints for querying data and sending commands.
-    """
-    click.echo("Starting API server...")
-    click.echo(f"Listening on: {host}:{port}")
-    click.echo(f"Database: {database_url}")
-    click.echo(f"Read key configured: {read_key is not None}")
-    click.echo(f"Admin key configured: {admin_key is not None}")
-    click.echo("API component not yet implemented.")
+cli.add_command(api)
 
 
 @cli.command()
diff --git a/src/meshcore_hub/api/app.py b/src/meshcore_hub/api/app.py
new file mode 100644
index 0000000..a2f5857
--- /dev/null
+++ b/src/meshcore_hub/api/app.py
@@ -0,0 +1,123 @@
+"""FastAPI application for MeshCore Hub API."""
+
+import logging
+from contextlib import asynccontextmanager
+from typing import AsyncGenerator
+
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+
+from meshcore_hub import __version__
+from meshcore_hub.common.database import DatabaseManager
+
+logger = logging.getLogger(__name__)
+
+# Global database manager (set during startup)
+_db_manager: DatabaseManager | None = None
+
+
+def get_db_manager() -> DatabaseManager:
+    """Get the global database manager."""
+    if _db_manager is None:
+        raise RuntimeError("Database not initialized")
+    return _db_manager
+
+
+@asynccontextmanager
+async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
+    """Application lifespan handler."""
+    global _db_manager
+
+    # Get database URL from app state
+    database_url = getattr(app.state, "database_url", "sqlite:///./meshcore.db")
+
+    # Initialize database
+    logger.info(f"Initializing database: {database_url}")
+    _db_manager = DatabaseManager(database_url)
+    _db_manager.create_tables()
+
+    yield
+
+    # Cleanup
+    if _db_manager:
+        _db_manager.dispose()
+        _db_manager = None
+    logger.info("Database connection closed")
+
+
+def create_app(
+    database_url: str = "sqlite:///./meshcore.db",
+    read_key: str | None = None,
+    admin_key: str | None = None,
+    mqtt_host: str = "localhost",
+    mqtt_port: int = 1883,
+    mqtt_prefix: str = "meshcore",
+    cors_origins: list[str] | None = None,
+) -> FastAPI:
+    """Create and configure the FastAPI application.
+
+    Args:
+        database_url: Database connection URL
+        read_key: Read-only API key
+        admin_key: Admin API key
+        mqtt_host: MQTT broker host
+        mqtt_port: MQTT broker port
+        mqtt_prefix: MQTT topic prefix
+        cors_origins: Allowed CORS origins
+
+    Returns:
+        Configured FastAPI application
+    """
+    app = FastAPI(
+        title="MeshCore Hub API",
+        description="REST API for querying MeshCore network data and sending commands",
+        version=__version__,
+        lifespan=lifespan,
+        docs_url="/api/docs",
+        redoc_url="/api/redoc",
+        openapi_url="/api/openapi.json",
+    )
+
+    # Store configuration in app state
+    app.state.database_url = database_url
+    app.state.read_key = read_key
+    app.state.admin_key = admin_key
+    app.state.mqtt_host = mqtt_host
+    app.state.mqtt_port = mqtt_port
+    app.state.mqtt_prefix = mqtt_prefix
+
+    # Configure CORS
+    if cors_origins is None:
+        cors_origins = ["*"]
+
+    app.add_middleware(
+        CORSMiddleware,
+        allow_origins=cors_origins,
+        allow_credentials=True,
+        allow_methods=["*"],
+        allow_headers=["*"],
+    )
+
+    # Include routers
+    from meshcore_hub.api.routes import api_router
+
+    app.include_router(api_router, prefix="/api/v1")
+
+    # Health check endpoints
+    @app.get("/health", tags=["Health"])
+    async def health() -> dict:
+        """Basic health check."""
+        return {"status": "healthy", "version": __version__}
+
+    @app.get("/health/ready", tags=["Health"])
+    async def health_ready() -> dict:
+        """Readiness check including database."""
+        try:
+            db = get_db_manager()
+            with db.session_scope() as session:
+                session.execute("SELECT 1")
+            return {"status": "ready", "database": "connected"}
+        except Exception as e:
+            return {"status": "not_ready", "database": str(e)}
+
+    return app
diff --git a/src/meshcore_hub/api/auth.py b/src/meshcore_hub/api/auth.py
new file mode 100644
index 0000000..dddb38d
--- /dev/null
+++ b/src/meshcore_hub/api/auth.py
@@ -0,0 +1,137 @@
+"""Authentication middleware for the API."""
+
+import logging
+from typing import Annotated
+
+from fastapi import Depends, HTTPException, Request, status
+from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
+
+logger = logging.getLogger(__name__)
+
+# Security scheme
+security = HTTPBearer(auto_error=False)
+
+
+def get_api_keys(request: Request) -> tuple[str | None, str | None]:
+    """Get API keys from app state.
+
+    Args:
+        request: FastAPI request
+
+    Returns:
+        Tuple of (read_key, admin_key)
+    """
+    return (
+        getattr(request.app.state, "read_key", None),
+        getattr(request.app.state, "admin_key", None),
+    )
+
+
+async def get_current_token(
+    credentials: Annotated[HTTPAuthorizationCredentials | None, Depends(security)],
+) -> str | None:
+    """Extract bearer token from request.
+
+    Args:
+        credentials: HTTP authorization credentials
+
+    Returns:
+        Token string or None
+    """
+    if credentials is None:
+        return None
+    return credentials.credentials
+
+
+async def require_read(
+    request: Request,
+    token: Annotated[str | None, Depends(get_current_token)],
+) -> str | None:
+    """Require read-level authentication.
+
+    Allows access if:
+    - No API keys are configured (open access)
+    - Token matches read key
+    - Token matches admin key
+
+    Args:
+        request: FastAPI request
+        token: Bearer token
+
+    Returns:
+        Token string
+
+    Raises:
+        HTTPException: If authentication fails
+    """
+    read_key, admin_key = get_api_keys(request)
+
+    # If no keys configured, allow access
+    if not read_key and not admin_key:
+        return token
+
+    # Require token if keys are configured
+    if not token:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Authentication required",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    # Check if token matches any key
+    if token == read_key or token == admin_key:
+        return token
+
+    raise HTTPException(
+        status_code=status.HTTP_403_FORBIDDEN,
+        detail="Invalid API key",
+    )
+
+
+async def require_admin(
+    request: Request,
+    token: Annotated[str | None, Depends(get_current_token)],
+) -> str:
+    """Require admin-level authentication.
+
+    Allows access if:
+    - No admin key is configured (open access)
+    - Token matches admin key
+
+    Args:
+        request: FastAPI request
+        token: Bearer token
+
+    Returns:
+        Token string
+
+    Raises:
+        HTTPException: If authentication fails
+    """
+    read_key, admin_key = get_api_keys(request)
+
+    # If no admin key configured, allow access
+    if not admin_key:
+        return token or ""
+
+    # Require token
+    if not token:
+        raise HTTPException(
+            status_code=status.HTTP_401_UNAUTHORIZED,
+            detail="Authentication required",
+            headers={"WWW-Authenticate": "Bearer"},
+        )
+
+    # Check if token matches admin key
+    if token == admin_key:
+        return token
+
+    raise HTTPException(
+        status_code=status.HTTP_403_FORBIDDEN,
+        detail="Admin access required",
+    )
+
+
+# Dependency types for use in routes
+RequireRead = Annotated[str | None, Depends(require_read)]
+RequireAdmin = Annotated[str, Depends(require_admin)]
diff --git a/src/meshcore_hub/api/cli.py b/src/meshcore_hub/api/cli.py
new file mode 100644
index 0000000..9df0011
--- /dev/null
+++ b/src/meshcore_hub/api/cli.py
@@ -0,0 +1,157 @@
+"""API CLI commands."""
+
+import click
+
+
+@click.command()
+@click.option(
+    "--host",
+    type=str,
+    default="0.0.0.0",
+    envvar="API_HOST",
+    help="API server host",
+)
+@click.option(
+    "--port",
+    type=int,
+    default=8000,
+    envvar="API_PORT",
+    help="API server port",
+)
+@click.option(
+    "--database-url",
+    type=str,
+    default="sqlite:///./meshcore.db",
+    envvar="DATABASE_URL",
+    help="Database connection URL",
+)
+@click.option(
+    "--read-key",
+    type=str,
+    default=None,
+    envvar="API_READ_KEY",
+    help="Read-only API key (optional, enables read-level auth)",
+)
+@click.option(
+    "--admin-key",
+    type=str,
+    default=None,
+    envvar="API_ADMIN_KEY",
+    help="Admin API key (optional, enables admin-level auth)",
+)
+@click.option(
+    "--mqtt-host",
+    type=str,
+    default="localhost",
+    envvar="MQTT_HOST",
+    help="MQTT broker host for commands",
+)
+@click.option(
+    "--mqtt-port",
+    type=int,
+    default=1883,
+    envvar="MQTT_PORT",
+    help="MQTT broker port",
+)
+@click.option(
+    "--mqtt-prefix",
+    type=str,
+    default="meshcore",
+    envvar="MQTT_TOPIC_PREFIX",
+    help="MQTT topic prefix",
+)
+@click.option(
+    "--cors-origins",
+    type=str,
+    default=None,
+    envvar="CORS_ORIGINS",
+    help="Comma-separated list of allowed CORS origins",
+)
+@click.option(
+    "--reload",
+    is_flag=True,
+    default=False,
+    help="Enable auto-reload for development",
+)
+@click.pass_context
+def api(
+    ctx: click.Context,
+    host: str,
+    port: int,
+    database_url: str,
+    read_key: str | None,
+    admin_key: str | None,
+    mqtt_host: str,
+    mqtt_port: int,
+    mqtt_prefix: str,
+    cors_origins: str | None,
+    reload: bool,
+) -> None:
+    """Run the REST API server.
+
+    Provides REST API endpoints for querying mesh network data and sending
+    commands to devices via MQTT.
+
+    Examples:
+
+        # Run with defaults (no auth)
+        meshcore-hub api
+
+        # Run with authentication
+        meshcore-hub api --read-key secret --admin-key supersecret
+
+        # Run with CORS for web frontend
+        meshcore-hub api --cors-origins "http://localhost:8080,http://localhost:3000"
+
+        # Development mode with auto-reload
+        meshcore-hub api --reload
+    """
+    import uvicorn
+
+    from meshcore_hub.api.app import create_app
+
+    click.echo("=" * 50)
+    click.echo("MeshCore Hub API Server")
+    click.echo("=" * 50)
+    click.echo(f"Host: {host}")
+    click.echo(f"Port: {port}")
+    click.echo(f"Database: {database_url}")
+    click.echo(f"MQTT: {mqtt_host}:{mqtt_port} (prefix: {mqtt_prefix})")
+    click.echo(f"Read key configured: {read_key is not None}")
+    click.echo(f"Admin key configured: {admin_key is not None}")
+    click.echo(f"CORS origins: {cors_origins or 'none'}")
+    click.echo(f"Reload mode: {reload}")
+    click.echo("=" * 50)
+
+    # Parse CORS origins
+    origins_list: list[str] | None = None
+    if cors_origins:
+        origins_list = [o.strip() for o in cors_origins.split(",")]
+
+    if reload:
+        # For development, use uvicorn's reload feature
+        # We need to pass app as string for reload to work
+        click.echo("\nStarting in development mode with auto-reload...")
+        click.echo("Note: Using default settings for reload mode.")
+
+        uvicorn.run(
+            "meshcore_hub.api.app:create_app",
+            host=host,
+            port=port,
+            reload=True,
+            factory=True,
+        )
+    else:
+        # For production, create app directly
+        app = create_app(
+            database_url=database_url,
+            read_key=read_key,
+            admin_key=admin_key,
+            mqtt_host=mqtt_host,
+            mqtt_port=mqtt_port,
+            mqtt_prefix=mqtt_prefix,
+            cors_origins=origins_list,
+        )
+
+        click.echo("\nStarting API server...")
+        uvicorn.run(app, host=host, port=port)
diff --git a/src/meshcore_hub/api/dependencies.py b/src/meshcore_hub/api/dependencies.py
new file mode 100644
index 0000000..5b68652
--- /dev/null
+++ b/src/meshcore_hub/api/dependencies.py
@@ -0,0 +1,73 @@
+"""FastAPI dependencies for the API."""
+
+import logging
+from typing import Annotated, Generator
+
+from fastapi import Depends, Request
+from sqlalchemy.orm import Session
+
+from meshcore_hub.common.database import DatabaseManager
+from meshcore_hub.common.mqtt import MQTTClient, MQTTConfig
+
+logger = logging.getLogger(__name__)
+
+
+def get_db_manager(request: Request) -> DatabaseManager:
+    """Get database manager from app.
+
+    Args:
+        request: FastAPI request
+
+    Returns:
+        DatabaseManager instance
+    """
+    from meshcore_hub.api.app import get_db_manager as _get_db_manager
+
+    return _get_db_manager()
+
+
+def get_db_session(
+    db_manager: Annotated[DatabaseManager, Depends(get_db_manager)],
+) -> Generator[Session, None, None]:
+    """Get a database session.
+
+    Args:
+        db_manager: Database manager
+
+    Yields:
+        Database session
+    """
+    session = db_manager.get_session()
+    try:
+        yield session
+    finally:
+        session.close()
+
+
+def get_mqtt_client(request: Request) -> MQTTClient:
+    """Get an MQTT client for publishing commands.
+
+    Args:
+        request: FastAPI request
+
+    Returns:
+        MQTTClient instance
+    """
+    mqtt_host = getattr(request.app.state, "mqtt_host", "localhost")
+    mqtt_port = getattr(request.app.state, "mqtt_port", 1883)
+    mqtt_prefix = getattr(request.app.state, "mqtt_prefix", "meshcore")
+
+    config = MQTTConfig(
+        host=mqtt_host,
+        port=mqtt_port,
+        prefix=mqtt_prefix,
+        client_id="meshcore-api",
+    )
+
+    client = MQTTClient(config)
+    return client
+
+
+# Dependency types for use in routes
+DbSession = Annotated[Session, Depends(get_db_session)]
+MqttClient = Annotated[MQTTClient, Depends(get_mqtt_client)]
diff --git a/src/meshcore_hub/api/routes/__init__.py b/src/meshcore_hub/api/routes/__init__.py
index 1d3b629..c9a5934 100644
--- a/src/meshcore_hub/api/routes/__init__.py
+++ b/src/meshcore_hub/api/routes/__init__.py
@@ -1 +1,28 @@
 """API route handlers."""
+
+from fastapi import APIRouter
+
+from meshcore_hub.api.routes.nodes import router as nodes_router
+from meshcore_hub.api.routes.node_tags import router as node_tags_router
+from meshcore_hub.api.routes.messages import router as messages_router
+from meshcore_hub.api.routes.advertisements import router as advertisements_router
+from meshcore_hub.api.routes.trace_paths import router as trace_paths_router
+from meshcore_hub.api.routes.telemetry import router as telemetry_router
+from meshcore_hub.api.routes.commands import router as commands_router
+from meshcore_hub.api.routes.dashboard import router as dashboard_router
+
+api_router = APIRouter()
+
+# Include all routers
+api_router.include_router(nodes_router, prefix="/nodes", tags=["Nodes"])
+api_router.include_router(node_tags_router, tags=["Node Tags"])
+api_router.include_router(messages_router, prefix="/messages", tags=["Messages"])
+api_router.include_router(
+    advertisements_router, prefix="/advertisements", tags=["Advertisements"]
+)
+api_router.include_router(
+    trace_paths_router, prefix="/trace-paths", tags=["Trace Paths"]
+)
+api_router.include_router(telemetry_router, prefix="/telemetry", tags=["Telemetry"])
+api_router.include_router(commands_router, prefix="/commands", tags=["Commands"])
+api_router.include_router(dashboard_router, tags=["Dashboard"])
diff --git a/src/meshcore_hub/api/routes/advertisements.py b/src/meshcore_hub/api/routes/advertisements.py
new file mode 100644
index 0000000..378b505
--- /dev/null
+++ b/src/meshcore_hub/api/routes/advertisements.py
@@ -0,0 +1,71 @@
+"""Advertisement API routes."""
+
+from datetime import datetime
+from typing import Optional
+
+from fastapi import APIRouter, HTTPException, Query
+from sqlalchemy import func, select
+
+from meshcore_hub.api.auth import RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import Advertisement
+from meshcore_hub.common.schemas.messages import AdvertisementList, AdvertisementRead
+
+router = APIRouter()
+
+
+@router.get("", response_model=AdvertisementList)
+async def list_advertisements(
+    _: RequireRead,
+    session: DbSession,
+    public_key: Optional[str] = Query(None, description="Filter by public key"),
+    since: Optional[datetime] = Query(None, description="Start timestamp"),
+    until: Optional[datetime] = Query(None, description="End timestamp"),
+    limit: int = Query(50, ge=1, le=100, description="Page size"),
+    offset: int = Query(0, ge=0, description="Page offset"),
+) -> AdvertisementList:
+    """List advertisements with filtering and pagination."""
+    # Build query
+    query = select(Advertisement)
+
+    if public_key:
+        query = query.where(Advertisement.public_key == public_key)
+
+    if since:
+        query = query.where(Advertisement.received_at >= since)
+
+    if until:
+        query = query.where(Advertisement.received_at <= until)
+
+    # Get total count
+    count_query = select(func.count()).select_from(query.subquery())
+    total = session.execute(count_query).scalar() or 0
+
+    # Apply pagination
+    query = query.order_by(Advertisement.received_at.desc()).offset(offset).limit(limit)
+
+    # Execute
+    advertisements = session.execute(query).scalars().all()
+
+    return AdvertisementList(
+        items=[AdvertisementRead.model_validate(a) for a in advertisements],
+        total=total,
+        limit=limit,
+        offset=offset,
+    )
+
+
+@router.get("/{advertisement_id}", response_model=AdvertisementRead)
+async def get_advertisement(
+    _: RequireRead,
+    session: DbSession,
+    advertisement_id: str,
+) -> AdvertisementRead:
+    """Get a single advertisement by ID."""
+    query = select(Advertisement).where(Advertisement.id == advertisement_id)
+    advertisement = session.execute(query).scalar_one_or_none()
+
+    if not advertisement:
+        raise HTTPException(status_code=404, detail="Advertisement not found")
+
+    return AdvertisementRead.model_validate(advertisement)
diff --git a/src/meshcore_hub/api/routes/commands.py b/src/meshcore_hub/api/routes/commands.py
new file mode 100644
index 0000000..3c62f4d
--- /dev/null
+++ b/src/meshcore_hub/api/routes/commands.py
@@ -0,0 +1,149 @@
+"""Command API routes for sending messages to the mesh network."""
+
+import logging
+import time
+
+from fastapi import APIRouter
+
+from meshcore_hub.api.auth import RequireAdmin
+from meshcore_hub.api.dependencies import MqttClient
+from meshcore_hub.common.schemas.commands import (
+    CommandResponse,
+    SendAdvertCommand,
+    SendChannelMessageCommand,
+    SendMessageCommand,
+)
+
+logger = logging.getLogger(__name__)
+
+router = APIRouter()
+
+
+@router.post("/send-message", response_model=CommandResponse)
+async def send_message(
+    _: RequireAdmin,
+    mqtt: MqttClient,
+    command: SendMessageCommand,
+) -> CommandResponse:
+    """Send a direct message to a node.
+
+    Publishes a send_msg command to MQTT for the sender interface to process.
+    """
+    try:
+        # Connect to MQTT
+        mqtt.connect()
+        mqtt.start_background()
+
+        # Build payload
+        payload = {
+            "destination": command.destination,
+            "text": command.text,
+            "timestamp": command.timestamp or int(time.time()),
+        }
+
+        # Publish to wildcard topic (any sender can pick it up)
+        mqtt.publish_command("+", "send_msg", payload)
+
+        # Cleanup
+        mqtt.stop()
+        mqtt.disconnect()
+
+        logger.info(f"Published send_msg command to {command.destination[:12]}...")
+
+        return CommandResponse(
+            success=True,
+            message=f"Message queued for {command.destination[:12]}...",
+        )
+
+    except Exception as e:
+        logger.error(f"Failed to send message: {e}")
+        return CommandResponse(
+            success=False,
+            message=f"Failed to send message: {str(e)}",
+        )
+
+
+@router.post("/send-channel-message", response_model=CommandResponse)
+async def send_channel_message(
+    _: RequireAdmin,
+    mqtt: MqttClient,
+    command: SendChannelMessageCommand,
+) -> CommandResponse:
+    """Send a message to a channel.
+
+    Publishes a send_channel_msg command to MQTT for the sender interface to process.
+    """
+    try:
+        # Connect to MQTT
+        mqtt.connect()
+        mqtt.start_background()
+
+        # Build payload
+        payload = {
+            "channel_idx": command.channel_idx,
+            "text": command.text,
+            "timestamp": command.timestamp or int(time.time()),
+        }
+
+        # Publish to wildcard topic
+        mqtt.publish_command("+", "send_channel_msg", payload)
+
+        # Cleanup
+        mqtt.stop()
+        mqtt.disconnect()
+
+        logger.info(f"Published send_channel_msg command to channel {command.channel_idx}")
+
+        return CommandResponse(
+            success=True,
+            message=f"Message queued for channel {command.channel_idx}",
+        )
+
+    except Exception as e:
+        logger.error(f"Failed to send channel message: {e}")
+        return CommandResponse(
+            success=False,
+            message=f"Failed to send channel message: {str(e)}",
+        )
+
+
+@router.post("/send-advertisement", response_model=CommandResponse)
+async def send_advertisement(
+    _: RequireAdmin,
+    mqtt: MqttClient,
+    command: SendAdvertCommand,
+) -> CommandResponse:
+    """Send a node advertisement.
+
+    Publishes a send_advert command to MQTT for the sender interface to process.
+    """
+    try:
+        # Connect to MQTT
+        mqtt.connect()
+        mqtt.start_background()
+
+        # Build payload
+        payload = {
+            "flood": command.flood,
+        }
+
+        # Publish to wildcard topic
+        mqtt.publish_command("+", "send_advert", payload)
+
+        # Cleanup
+        mqtt.stop()
+        mqtt.disconnect()
+
+        logger.info(f"Published send_advert command (flood={command.flood})")
+
+        return CommandResponse(
+            success=True,
+            message=f"Advertisement queued (flood={command.flood})",
+        )
+
+    except Exception as e:
+        logger.error(f"Failed to send advertisement: {e}")
+        return CommandResponse(
+            success=False,
+            message=f"Failed to send advertisement: {str(e)}",
+        )
diff --git a/src/meshcore_hub/api/routes/dashboard.py b/src/meshcore_hub/api/routes/dashboard.py
new file mode 100644
index 0000000..679c56f
--- /dev/null
+++ b/src/meshcore_hub/api/routes/dashboard.py
@@ -0,0 +1,237 @@
+"""Dashboard API routes."""
+
+from datetime import datetime, timedelta, timezone
+
+from fastapi import APIRouter, Request
+from fastapi.responses import HTMLResponse
+from sqlalchemy import func, select
+
+from meshcore_hub.api.auth import RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import Advertisement, Message, Node
+from meshcore_hub.common.schemas.messages import DashboardStats
+
+router = APIRouter()
+
+
+@router.get("/stats", response_model=DashboardStats)
+async def get_stats(
+    _: RequireRead,
+    session: DbSession,
+) -> DashboardStats:
+    """Get dashboard statistics."""
+    now = datetime.now(timezone.utc)
+    today_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
+    yesterday = now - timedelta(days=1)
+
+    # Total nodes
+    total_nodes = session.execute(
+        select(func.count()).select_from(Node)
+    ).scalar() or 0
+
+    # Active nodes (last 24h)
+    active_nodes = session.execute(
+        select(func.count()).select_from(Node).where(Node.last_seen >= yesterday)
+    ).scalar() or 0
+
+    # Total messages
+    total_messages = session.execute(
+        select(func.count()).select_from(Message)
+    ).scalar() or 0
+
+    # Messages today
+    messages_today = session.execute(
+        select(func.count())
+        .select_from(Message)
+        .where(Message.received_at >= today_start)
+    ).scalar() or 0
+
+    # Total advertisements
+    total_advertisements = session.execute(
+        select(func.count()).select_from(Advertisement)
+    ).scalar() or 0
+
+    # Channel message counts
+    channel_counts_query = (
+        select(Message.channel_idx, func.count())
+        .where(Message.message_type == "channel")
+        .where(Message.channel_idx.isnot(None))
+        .group_by(Message.channel_idx)
+    )
+    channel_results = session.execute(channel_counts_query).all()
+    channel_message_counts = {
+        int(channel): int(count) for channel, count in channel_results
+    }
+
+    return DashboardStats(
+        total_nodes=total_nodes,
+        active_nodes=active_nodes,
+        total_messages=total_messages,
+        messages_today=messages_today,
+        total_advertisements=total_advertisements,
+        channel_message_counts=channel_message_counts,
+    )
+
+
+@router.get("/dashboard", response_class=HTMLResponse)
+async def dashboard(
+    request: Request,
+    session: DbSession,
+) -> HTMLResponse:
+    """Simple HTML dashboard page."""
+    now = datetime.now(timezone.utc)
+    today_start = now.replace(hour=0, minute=0, second=0, microsecond=0)
+    yesterday = now - timedelta(days=1)
+
+    # Get stats
+    total_nodes = session.execute(
+        select(func.count()).select_from(Node)
+    ).scalar() or 0
+
+    active_nodes = session.execute(
+        select(func.count()).select_from(Node).where(Node.last_seen >= yesterday)
+    ).scalar() or 0
+
+    total_messages = session.execute(
+        select(func.count()).select_from(Message)
+    ).scalar() or 0
+
+    messages_today = session.execute(
+        select(func.count())
+        .select_from(Message)
+        .where(Message.received_at >= today_start)
+    ).scalar() or 0
+
+    # Get recent nodes
+    recent_nodes = session.execute(
+        select(Node).order_by(Node.last_seen.desc()).limit(10)
+    ).scalars().all()
+
+    # Get recent messages
+    recent_messages = session.execute(
+        select(Message).order_by(Message.received_at.desc()).limit(10)
+    ).scalars().all()
+
+    # Build HTML
+    html = f"""
+<!DOCTYPE html>
+<html>
+<head>
+    <title>MeshCore Hub Dashboard</title>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta http-equiv="refresh" content="30">
+    <style>
+        body {{
+            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
+            margin: 0;
+            padding: 20px;
+            background: #f5f5f5;
+            color: #333;
+        }}
+        h1 {{ color: #2c3e50; }}
+        .container {{ max-width: 1200px; margin: 0 auto; }}
+        .stats {{
+            display: grid;
+            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
+            gap: 20px;
+            margin-bottom: 30px;
+        }}
+        .stat-card {{
+            background: white;
+            padding: 20px;
+            border-radius: 8px;
+            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+        }}
+        .stat-card h3 {{ margin: 0 0 10px 0; color: #666; font-size: 14px; }}
+        .stat-card .value {{ font-size: 32px; font-weight: bold; color: #2c3e50; }}
+        .section {{
+            background: white;
+            padding: 20px;
+            border-radius: 8px;
+            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
+            margin-bottom: 20px;
+        }}
+        table {{ width: 100%; border-collapse: collapse; }}
+        th, td {{ padding: 10px; text-align: left; border-bottom: 1px solid #eee; }}
+        th {{ background: #f8f9fa; font-weight: 600; }}
+        .text-muted {{ color: #666; }}
+        .truncate {{ max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }}
+    </style>
+</head>
+<body>
+    <div class="container">
+        <h1>MeshCore Hub Dashboard</h1>
+        <p class="text-muted">Last updated: {now.strftime('%Y-%m-%d %H:%M:%S UTC')}</p>
+
+        <div class="stats">
+            <div class="stat-card">
+                <h3>Total Nodes</h3>
+                <div class="value">{total_nodes}</div>
+            </div>
+            <div class="stat-card">
+                <h3>Active Nodes (24h)</h3>
+                <div class="value">{active_nodes}</div>
+            </div>
+            <div class="stat-card">
+                <h3>Total Messages</h3>
+                <div class="value">{total_messages}</div>
+            </div>
+            <div class="stat-card">
+                <h3>Messages Today</h3>
+                <div class="value">{messages_today}</div>
+            </div>
+        </div>
+
+        <div class="section">
+            <h2>Recent Nodes</h2>
+            <table>
+                <thead>
+                    <tr>
+                        <th>Name</th>
+                        <th>Public Key</th>
+                        <th>Type</th>
+                        <th>Last Seen</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {"".join(f'''
+                    <tr>
+                        <td>{n.name or '-'}</td>
+                        <td class="truncate">{n.public_key[:16]}...</td>
+                        <td>{n.adv_type or '-'}</td>
+                        <td>{n.last_seen.strftime('%Y-%m-%d %H:%M') if n.last_seen else '-'}</td>
+                    </tr>
+                    ''' for n in recent_nodes)}
+                </tbody>
+            </table>
+        </div>
+
+        <div class="section">
+            <h2>Recent Messages</h2>
+            <table>
+                <thead>
+                    <tr>
+                        <th>Type</th>
+                        <th>From/Channel</th>
+                        <th>Text</th>
+                        <th>Received</th>
+                    </tr>
+                </thead>
+                <tbody>
+                    {"".join(f'''
+                    <tr>
+                        <td>{m.message_type}</td>
+                        <td>{m.pubkey_prefix or f'Ch {m.channel_idx}' or '-'}</td>
+                        <td class="truncate">{m.text[:50]}{'...' if len(m.text) > 50 else ''}</td>
+                        <td>{m.received_at.strftime('%Y-%m-%d %H:%M') if m.received_at else '-'}</td>
+                    </tr>
+                    ''' for m in recent_messages)}
+                </tbody>
+            </table>
+        </div>
+    </div>
+</body>
+</html>
+"""
+    return HTMLResponse(content=html)
diff --git a/src/meshcore_hub/api/routes/messages.py b/src/meshcore_hub/api/routes/messages.py
new file mode 100644
index 0000000..e2f255a
--- /dev/null
+++ b/src/meshcore_hub/api/routes/messages.py
@@ -0,0 +1,83 @@
+"""Message API routes."""
+
+from datetime import datetime
+from typing import Optional
+
+from fastapi import APIRouter, HTTPException, Query
+from sqlalchemy import func, select
+
+from meshcore_hub.api.auth import RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import Message
+from meshcore_hub.common.schemas.messages import MessageList, MessageRead
+
+router = APIRouter()
+
+
+@router.get("", response_model=MessageList)
+async def list_messages(
+    _: RequireRead,
+    session: DbSession,
+    type: Optional[str] = Query(None, description="Filter by message type"),
+    pubkey_prefix: Optional[str] = Query(None, description="Filter by sender prefix"),
+    channel_idx: Optional[int] = Query(None, description="Filter by channel"),
+    since: Optional[datetime] = Query(None, description="Start timestamp"),
+    until: Optional[datetime] = Query(None, description="End timestamp"),
+    search: Optional[str] = Query(None, description="Search in message text"),
+    limit: int = Query(50, ge=1, le=100, description="Page size"),
+    offset: int = Query(0, ge=0, description="Page offset"),
+) -> MessageList:
+    """List messages with filtering and pagination."""
+    # Build query
+    query = select(Message)
+
+    if type:
+        query = query.where(Message.message_type == type)
+
+    if pubkey_prefix:
+        query = query.where(Message.pubkey_prefix == pubkey_prefix)
+
+    if channel_idx is not None:
+        query = query.where(Message.channel_idx == channel_idx)
+
+    if since:
+        query = query.where(Message.received_at >= since)
+
+    if until:
+        query = query.where(Message.received_at <= until)
+
+    if search:
+        query = query.where(Message.text.ilike(f"%{search}%"))
+
+    # Get total count
+    count_query = select(func.count()).select_from(query.subquery())
+    total = session.execute(count_query).scalar() or 0
+
+    # Apply pagination
+    query = query.order_by(Message.received_at.desc()).offset(offset).limit(limit)
+
+    # Execute
+    messages = session.execute(query).scalars().all()
+
+    return MessageList(
+        items=[MessageRead.model_validate(m) for m in messages],
+        total=total,
+        limit=limit,
+        offset=offset,
+    )
+
+
+@router.get("/{message_id}", response_model=MessageRead)
+async def get_message(
+    _: RequireRead,
+    session: DbSession,
+    message_id: str,
+) -> MessageRead:
+    """Get a single message by ID."""
+    query = select(Message).where(Message.id == message_id)
+    message = session.execute(query).scalar_one_or_none()
+
+    if not message:
+        raise HTTPException(status_code=404, detail="Message not found")
+
+    return MessageRead.model_validate(message)
diff --git a/src/meshcore_hub/api/routes/node_tags.py b/src/meshcore_hub/api/routes/node_tags.py
new file mode 100644
index 0000000..2da9c2b
--- /dev/null
+++ b/src/meshcore_hub/api/routes/node_tags.py
@@ -0,0 +1,131 @@
+"""Node tag API routes."""
+
+from fastapi import APIRouter, HTTPException
+from sqlalchemy import select
+
+from meshcore_hub.api.auth import RequireAdmin, RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import Node, NodeTag
+from meshcore_hub.common.schemas.nodes import NodeTagCreate, NodeTagRead, NodeTagUpdate
+
+router = APIRouter()
+
+
+@router.get("/nodes/{public_key}/tags", response_model=list[NodeTagRead])
+async def list_node_tags(
+    _: RequireRead,
+    session: DbSession,
+    public_key: str,
+) -> list[NodeTagRead]:
+    """List all tags for a node."""
+    # Find node
+    node_query = select(Node).where(Node.public_key == public_key)
+    node = session.execute(node_query).scalar_one_or_none()
+
+    if not node:
+        raise HTTPException(status_code=404, detail="Node not found")
+
+    return [NodeTagRead.model_validate(t) for t in node.tags]
+
+
+@router.post("/nodes/{public_key}/tags", response_model=NodeTagRead, status_code=201)
+async def create_node_tag(
+    _: RequireAdmin,
+    session: DbSession,
+    public_key: str,
+    tag: NodeTagCreate,
+) -> NodeTagRead:
+    """Create a new tag for a node."""
+    # Find node
+    node_query = select(Node).where(Node.public_key == public_key)
+    node = session.execute(node_query).scalar_one_or_none()
+
+    if not node:
+        raise HTTPException(status_code=404, detail="Node not found")
+
+    # Check if tag already exists
+    existing_query = select(NodeTag).where(
+        (NodeTag.node_id == node.id) & (NodeTag.key == tag.key)
+    )
+    existing = session.execute(existing_query).scalar_one_or_none()
+
+    if existing:
+        raise HTTPException(status_code=409, detail="Tag already exists")
+
+    # Create tag
+    node_tag = NodeTag(
+        node_id=node.id,
+        key=tag.key,
+        value=tag.value,
+        value_type=tag.value_type,
+    )
+    session.add(node_tag)
+    session.commit()
+    session.refresh(node_tag)
+
+    return NodeTagRead.model_validate(node_tag)
+
+
+@router.put("/nodes/{public_key}/tags/{key}", response_model=NodeTagRead)
+async def update_node_tag(
+    _: RequireAdmin,
+    session: DbSession,
+    public_key: str,
+    key: str,
+    tag: NodeTagUpdate,
+) -> NodeTagRead:
+    """Update a node tag."""
+    # Find node
+    node_query = select(Node).where(Node.public_key == public_key)
+    node = session.execute(node_query).scalar_one_or_none()
+
+    if not node:
+        raise HTTPException(status_code=404, detail="Node not found")
+
+    # Find tag
+    tag_query = select(NodeTag).where(
+        (NodeTag.node_id == node.id) & (NodeTag.key == key)
+    )
+    node_tag = session.execute(tag_query).scalar_one_or_none()
+
+    if not node_tag:
+        raise HTTPException(status_code=404, detail="Tag not found")
+
+    # Update tag
+    if tag.value is not None:
+        node_tag.value = tag.value
+    if tag.value_type is not None:
+        node_tag.value_type = tag.value_type
+
+    session.commit()
+    session.refresh(node_tag)
+
+    return NodeTagRead.model_validate(node_tag)
+
+
+@router.delete("/nodes/{public_key}/tags/{key}", status_code=204)
+async def delete_node_tag(
+    _: RequireAdmin,
+    session: DbSession,
+    public_key: str,
+    key: str,
+) -> None:
+    """Delete a node tag."""
+    # Find node
+    node_query = select(Node).where(Node.public_key == public_key)
+    node = session.execute(node_query).scalar_one_or_none()
+
+    if not node:
+        raise HTTPException(status_code=404, detail="Node not found")
+
+    # Find and delete tag
+    tag_query = select(NodeTag).where(
+        (NodeTag.node_id == node.id) & (NodeTag.key == key)
+    )
+    node_tag = session.execute(tag_query).scalar_one_or_none()
+
+    if not node_tag:
+        raise HTTPException(status_code=404, detail="Tag not found")
+
+    session.delete(node_tag)
+    session.commit()
diff --git a/src/meshcore_hub/api/routes/nodes.py b/src/meshcore_hub/api/routes/nodes.py
new file mode 100644
index 0000000..27a1d66
--- /dev/null
+++ b/src/meshcore_hub/api/routes/nodes.py
@@ -0,0 +1,68 @@
+"""Node API routes."""
+
+from typing import Optional
+
+from fastapi import APIRouter, HTTPException, Query
+from sqlalchemy import func, select
+
+from meshcore_hub.api.auth import RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import Node
+from meshcore_hub.common.schemas.nodes import NodeList, NodeRead
+
+router = APIRouter()
+
+
+@router.get("", response_model=NodeList)
+async def list_nodes(
+    _: RequireRead,
+    session: DbSession,
+    search: Optional[str] = Query(None, description="Search in name or public key"),
+    adv_type: Optional[str] = Query(None, description="Filter by advertisement type"),
+    limit: int = Query(50, ge=1, le=100, description="Page size"),
+    offset: int = Query(0, ge=0, description="Page offset"),
+) -> NodeList:
+    """List all nodes with pagination and filtering."""
+    # Build query
+    query = select(Node)
+
+    if search:
+        query = query.where(
+            (Node.name.ilike(f"%{search}%")) | (Node.public_key.ilike(f"%{search}%"))
+        )
+
+    if adv_type:
+        query = query.where(Node.adv_type == adv_type)
+
+    # Get total count
+    count_query = select(func.count()).select_from(query.subquery())
+    total = session.execute(count_query).scalar() or 0
+
+    # Apply pagination
+    query = query.order_by(Node.last_seen.desc()).offset(offset).limit(limit)
+
+    # Execute
+    nodes = session.execute(query).scalars().all()
+
+    return NodeList(
+        items=[NodeRead.model_validate(n) for n in nodes],
+        total=total,
+        limit=limit,
+        offset=offset,
+    )
+
+
+@router.get("/{public_key}", response_model=NodeRead)
+async def get_node(
+    _: RequireRead,
+    session: DbSession,
+    public_key: str,
+) -> NodeRead:
+    """Get a single node by public key."""
+    query = select(Node).where(Node.public_key == public_key)
+    node = session.execute(query).scalar_one_or_none()
+
+    if not node:
+        raise HTTPException(status_code=404, detail="Node not found")
+
+    return NodeRead.model_validate(node)
diff --git a/src/meshcore_hub/api/routes/telemetry.py b/src/meshcore_hub/api/routes/telemetry.py
new file mode 100644
index 0000000..0d954cb
--- /dev/null
+++ b/src/meshcore_hub/api/routes/telemetry.py
@@ -0,0 +1,71 @@
+"""Telemetry API routes."""
+
+from datetime import datetime
+from typing import Optional
+
+from fastapi import APIRouter, HTTPException, Query
+from sqlalchemy import func, select
+
+from meshcore_hub.api.auth import RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import Telemetry
+from meshcore_hub.common.schemas.messages import TelemetryList, TelemetryRead
+
+router = APIRouter()
+
+
+@router.get("", response_model=TelemetryList)
+async def list_telemetry(
+    _: RequireRead,
+    session: DbSession,
+    node_public_key: Optional[str] = Query(None, description="Filter by node"),
+    since: Optional[datetime] = Query(None, description="Start timestamp"),
+    until: Optional[datetime] = Query(None, description="End timestamp"),
+    limit: int = Query(50, ge=1, le=100, description="Page size"),
+    offset: int = Query(0, ge=0, description="Page offset"),
+) -> TelemetryList:
+    """List telemetry records with filtering and pagination."""
+    # Build query
+    query = select(Telemetry)
+
+    if node_public_key:
+        query = query.where(Telemetry.node_public_key == node_public_key)
+
+    if since:
+        query = query.where(Telemetry.received_at >= since)
+
+    if until:
+        query = query.where(Telemetry.received_at <= until)
+
+    # Get total count
+    count_query = select(func.count()).select_from(query.subquery())
+    total = session.execute(count_query).scalar() or 0
+
+    # Apply pagination
+    query = query.order_by(Telemetry.received_at.desc()).offset(offset).limit(limit)
+
+    # Execute
+    records = session.execute(query).scalars().all()
+
+    return TelemetryList(
+        items=[TelemetryRead.model_validate(t) for t in records],
+        total=total,
+        limit=limit,
+        offset=offset,
+    )
+
+
+@router.get("/{telemetry_id}", response_model=TelemetryRead)
+async def get_telemetry(
+    _: RequireRead,
+    session: DbSession,
+    telemetry_id: str,
+) -> TelemetryRead:
+    """Get a single telemetry record by ID."""
+    query = select(Telemetry).where(Telemetry.id == telemetry_id)
+    telemetry = session.execute(query).scalar_one_or_none()
+
+    if not telemetry:
+        raise HTTPException(status_code=404, detail="Telemetry record not found")
+
+    return TelemetryRead.model_validate(telemetry)
diff --git a/src/meshcore_hub/api/routes/trace_paths.py b/src/meshcore_hub/api/routes/trace_paths.py
new file mode 100644
index 0000000..38a5b42
--- /dev/null
+++ b/src/meshcore_hub/api/routes/trace_paths.py
@@ -0,0 +1,67 @@
+"""Trace path API routes."""
+
+from datetime import datetime
+from typing import Optional
+
+from fastapi import APIRouter, HTTPException, Query
+from sqlalchemy import func, select
+
+from meshcore_hub.api.auth import RequireRead
+from meshcore_hub.api.dependencies import DbSession
+from meshcore_hub.common.models import TracePath
+from meshcore_hub.common.schemas.messages import TracePathList, TracePathRead
+
+router = APIRouter()
+
+
+@router.get("", response_model=TracePathList)
+async def list_trace_paths(
+    _: RequireRead,
+    session: DbSession,
+    since: Optional[datetime] = Query(None, description="Start timestamp"),
+    until: Optional[datetime] = Query(None, description="End timestamp"),
+    limit: int = Query(50, ge=1, le=100, description="Page size"),
+    offset: int = Query(0, ge=0, description="Page offset"),
+) -> TracePathList:
+    """List trace paths with filtering and pagination."""
+    # Build query
+    query = select(TracePath)
+
+    if since:
+        query = query.where(TracePath.received_at >= since)
+
+    if until:
+        query = query.where(TracePath.received_at <= until)
+
+    # Get total count
+    count_query = select(func.count()).select_from(query.subquery())
+    total = session.execute(count_query).scalar() or 0
+
+    # Apply pagination
+    query = query.order_by(TracePath.received_at.desc()).offset(offset).limit(limit)
+
+    # Execute
+    trace_paths = session.execute(query).scalars().all()
+
+    return TracePathList(
+        items=[TracePathRead.model_validate(t) for t in trace_paths],
+        total=total,
+        limit=limit,
+        offset=offset,
+    )
+
+
+@router.get("/{trace_path_id}", response_model=TracePathRead)
+async def get_trace_path(
+    _: RequireRead,
+    session: DbSession,
+    trace_path_id: str,
+) -> TracePathRead:
+    """Get a single trace path by ID."""
+    query = select(TracePath).where(TracePath.id == trace_path_id)
+    trace_path = session.execute(query).scalar_one_or_none()
+
+    if not trace_path:
+        raise HTTPException(status_code=404, detail="Trace path not found")
+
+    return TracePathRead.model_validate(trace_path)
diff --git a/src/meshcore_hub/common/models/telemetry.py b/src/meshcore_hub/common/models/telemetry.py
index 991edf3..7bf1341 100644
--- a/src/meshcore_hub/common/models/telemetry.py
+++ b/src/meshcore_hub/common/models/telemetry.py
@@ -56,7 +56,6 @@ class Telemetry(Base, UUIDMixin, TimestampMixin):
     )
 
     __table_args__ = (
-        Index("ix_telemetry_node_public_key", "node_public_key"),
         Index("ix_telemetry_received_at", "received_at"),
     )
 
diff --git a/tests/test_api/conftest.py b/tests/test_api/conftest.py
new file mode 100644
index 0000000..55e5ccf
--- /dev/null
+++ b/tests/test_api/conftest.py
@@ -0,0 +1,262 @@
+"""API test fixtures."""
+
+import os
+import tempfile
+from datetime import datetime, timezone
+from unittest.mock import MagicMock, patch
+
+import pytest
+from fastapi.testclient import TestClient
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker
+
+from meshcore_hub.api.app import create_app
+from meshcore_hub.api.dependencies import get_db_session, get_mqtt_client, get_db_manager
+from meshcore_hub.common.database import DatabaseManager
+from meshcore_hub.common.models import (
+    Advertisement,
+    Base,
+    Message,
+    Node,
+    NodeTag,
+    Telemetry,
+    TracePath,
+)
+
+
+@pytest.fixture
+def test_db_path():
+    """Create a temporary database file path."""
+    fd, path = tempfile.mkstemp(suffix=".db")
+    os.close(fd)
+    yield path
+    # Cleanup
+    if os.path.exists(path):
+        os.unlink(path)
+
+
+@pytest.fixture
+def api_db_engine(test_db_path):
+    """Create a SQLite database engine for API testing."""
+    db_url = f"sqlite:///{test_db_path}"
+    engine = create_engine(
+        db_url,
+        connect_args={"check_same_thread": False},
+    )
+    Base.metadata.create_all(engine)
+    yield engine
+    Base.metadata.drop_all(engine)
+    engine.dispose()
+
+
+@pytest.fixture
+def api_db_session(api_db_engine):
+    """Create a database session for API testing."""
+    Session = sessionmaker(bind=api_db_engine)
+    session = Session()
+    yield session
+    session.close()
+
+
+@pytest.fixture
+def mock_mqtt():
+    """Create a mock MQTT client."""
+    mock = MagicMock()
+    mock.connect.return_value = None
+    mock.start_background.return_value = None
+    mock.stop.return_value = None
+    mock.disconnect.return_value = None
+    mock.publish_command.return_value = None
+    return mock
+
+
+@pytest.fixture
+def mock_db_manager(api_db_engine):
+    """Create a mock database manager using the test engine."""
+    manager = MagicMock(spec=DatabaseManager)
+    Session = sessionmaker(bind=api_db_engine)
+    manager.get_session = lambda: Session()
+    return manager
+
+
+@pytest.fixture
+def app_no_auth(test_db_path, api_db_engine, mock_mqtt, mock_db_manager):
+    """Create a FastAPI app with no authentication required."""
+    db_url = f"sqlite:///{test_db_path}"
+
+    # Patch the global db_manager to avoid lifespan issues
+    with patch("meshcore_hub.api.app._db_manager", mock_db_manager):
+        app = create_app(
+            database_url=db_url,
+            read_key=None,
+            admin_key=None,
+        )
+
+        # Create session maker for this test engine
+        Session = sessionmaker(bind=api_db_engine)
+
+        def override_get_db_manager(request=None):
+            return mock_db_manager
+
+        def override_get_db_session():
+            session = Session()
+            try:
+                yield session
+            finally:
+                session.close()
+
+        def override_get_mqtt_client(request=None):
+            return mock_mqtt
+
+        app.dependency_overrides[get_db_manager] = override_get_db_manager
+        app.dependency_overrides[get_db_session] = override_get_db_session
+        app.dependency_overrides[get_mqtt_client] = override_get_mqtt_client
+
+        yield app
+
+
+@pytest.fixture
+def app_with_auth(test_db_path, api_db_engine, mock_mqtt, mock_db_manager):
+    """Create a FastAPI app with authentication enabled."""
+    db_url = f"sqlite:///{test_db_path}"
+
+    with patch("meshcore_hub.api.app._db_manager", mock_db_manager):
+        app = create_app(
+            database_url=db_url,
+            read_key="test-read-key",
+            admin_key="test-admin-key",
+        )
+
+        Session = sessionmaker(bind=api_db_engine)
+
+        def override_get_db_manager(request=None):
+            return mock_db_manager
+
+        def override_get_db_session():
+            session = Session()
+            try:
+                yield session
+            finally:
+                session.close()
+
+        def override_get_mqtt_client(request=None):
+            return mock_mqtt
+
+        app.dependency_overrides[get_db_manager] = override_get_db_manager
+        app.dependency_overrides[get_db_session] = override_get_db_session
+        app.dependency_overrides[get_mqtt_client] = override_get_mqtt_client
+
+        yield app
+
+
+@pytest.fixture
+def client_no_auth(app_no_auth, mock_db_manager):
+    """Create a test client with no authentication.
+
+    Uses raise_server_exceptions=False to skip lifespan events.
+    """
+    # Don't use context manager to skip lifespan
+    client = TestClient(app_no_auth, raise_server_exceptions=True)
+    yield client
+
+
+@pytest.fixture
+def client_with_auth(app_with_auth, mock_db_manager):
+    """Create a test client with authentication enabled.
+
+    Uses raise_server_exceptions=False to skip lifespan events.
+    """
+    client = TestClient(app_with_auth, raise_server_exceptions=True)
+    yield client
+
+
+@pytest.fixture
+def sample_node(api_db_session):
+    """Create a sample node in the database."""
+    node = Node(
+        public_key="abc123def456abc123def456abc123de",
+        name="Test Node",
+        adv_type="REPEATER",
+        first_seen=datetime.now(timezone.utc),
+        last_seen=datetime.now(timezone.utc),
+    )
+    api_db_session.add(node)
+    api_db_session.commit()
+    api_db_session.refresh(node)
+    return node
+
+
+@pytest.fixture
+def sample_node_tag(api_db_session, sample_node):
+    """Create a sample node tag in the database."""
+    tag = NodeTag(
+        node_id=sample_node.id,
+        key="environment",
+        value="production",
+    )
+    api_db_session.add(tag)
+    api_db_session.commit()
+    api_db_session.refresh(tag)
+    return tag
+
+
+@pytest.fixture
+def sample_message(api_db_session):
+    """Create a sample message in the database."""
+    message = Message(
+        message_type="direct",
+        pubkey_prefix="abc123",
+        text="Hello World",
+        received_at=datetime.now(timezone.utc),
+    )
+    api_db_session.add(message)
+    api_db_session.commit()
+    api_db_session.refresh(message)
+    return message
+
+
+@pytest.fixture
+def sample_advertisement(api_db_session):
+    """Create a sample advertisement in the database."""
+    advert = Advertisement(
+        public_key="abc123def456abc123def456abc123de",
+        name="TestNode",
+        adv_type="REPEATER",
+        received_at=datetime.now(timezone.utc),
+    )
+    api_db_session.add(advert)
+    api_db_session.commit()
+    api_db_session.refresh(advert)
+    return advert
+
+
+@pytest.fixture
+def sample_telemetry(api_db_session):
+    """Create a sample telemetry record in the database."""
+    telemetry = Telemetry(
+        node_public_key="abc123def456abc123def456abc123de",
+        parsed_data={
+            "battery_level": 85.5,
+            "temperature": 25.3,
+        },
+        received_at=datetime.now(timezone.utc),
+    )
+    api_db_session.add(telemetry)
+    api_db_session.commit()
+    api_db_session.refresh(telemetry)
+    return telemetry
+
+
+@pytest.fixture
+def sample_trace_path(api_db_session):
+    """Create a sample trace path in the database."""
+    trace = TracePath(
+        initiator_tag=12345,
+        path_hashes=["abc123", "def456", "ghi789"],
+        hop_count=3,
+        received_at=datetime.now(timezone.utc),
+    )
+    api_db_session.add(trace)
+    api_db_session.commit()
+    api_db_session.refresh(trace)
+    return trace
diff --git a/tests/test_api/test_advertisements.py b/tests/test_api/test_advertisements.py
new file mode 100644
index 0000000..803a13f
--- /dev/null
+++ b/tests/test_api/test_advertisements.py
@@ -0,0 +1,62 @@
+"""Tests for advertisement API routes."""
+
+import pytest
+
+
+class TestListAdvertisements:
+    """Tests for GET /advertisements endpoint."""
+
+    def test_list_advertisements_empty(self, client_no_auth):
+        """Test listing advertisements when database is empty."""
+        response = client_no_auth.get("/api/v1/advertisements")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["items"] == []
+        assert data["total"] == 0
+
+    def test_list_advertisements_with_data(self, client_no_auth, sample_advertisement):
+        """Test listing advertisements with data in database."""
+        response = client_no_auth.get("/api/v1/advertisements")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+        assert data["total"] == 1
+        assert data["items"][0]["public_key"] == sample_advertisement.public_key
+        assert data["items"][0]["adv_type"] == sample_advertisement.adv_type
+
+    def test_list_advertisements_filter_by_public_key(
+        self, client_no_auth, sample_advertisement
+    ):
+        """Test filtering advertisements by public key."""
+        response = client_no_auth.get(
+            f"/api/v1/advertisements?public_key={sample_advertisement.public_key}"
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+
+        response = client_no_auth.get(
+            "/api/v1/advertisements?public_key=nonexistent"
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 0
+
+
+class TestGetAdvertisement:
+    """Tests for GET /advertisements/{id} endpoint."""
+
+    def test_get_advertisement_success(self, client_no_auth, sample_advertisement):
+        """Test getting a specific advertisement."""
+        response = client_no_auth.get(
+            f"/api/v1/advertisements/{sample_advertisement.id}"
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["id"] == sample_advertisement.id
+        assert data["public_key"] == sample_advertisement.public_key
+
+    def test_get_advertisement_not_found(self, client_no_auth):
+        """Test getting a non-existent advertisement."""
+        response = client_no_auth.get("/api/v1/advertisements/nonexistent-id")
+        assert response.status_code == 404
diff --git a/tests/test_api/test_auth.py b/tests/test_api/test_auth.py
new file mode 100644
index 0000000..b084090
--- /dev/null
+++ b/tests/test_api/test_auth.py
@@ -0,0 +1,106 @@
+"""Tests for API authentication."""
+
+import pytest
+
+
+class TestAuthenticationFlow:
+    """Tests for authentication behavior."""
+
+    def test_no_auth_when_keys_not_configured(self, client_no_auth):
+        """Test that no auth is required when keys are not configured."""
+        # All endpoints should work without auth
+        response = client_no_auth.get("/api/v1/nodes")
+        assert response.status_code == 200
+
+        response = client_no_auth.get("/api/v1/messages")
+        assert response.status_code == 200
+
+        response = client_no_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Test",
+            },
+        )
+        assert response.status_code == 200
+
+    def test_read_endpoints_accept_read_key(self, client_with_auth):
+        """Test that read endpoints accept read key."""
+        response = client_with_auth.get(
+            "/api/v1/nodes",
+            headers={"Authorization": "Bearer test-read-key"},
+        )
+        assert response.status_code == 200
+
+    def test_read_endpoints_accept_admin_key(self, client_with_auth):
+        """Test that read endpoints accept admin key."""
+        response = client_with_auth.get(
+            "/api/v1/nodes",
+            headers={"Authorization": "Bearer test-admin-key"},
+        )
+        assert response.status_code == 200
+
+    def test_admin_endpoints_reject_read_key(self, client_with_auth):
+        """Test that admin endpoints reject read key."""
+        response = client_with_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Test",
+            },
+            headers={"Authorization": "Bearer test-read-key"},
+        )
+        assert response.status_code == 403
+
+    def test_admin_endpoints_accept_admin_key(self, client_with_auth):
+        """Test that admin endpoints accept admin key."""
+        response = client_with_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Test",
+            },
+            headers={"Authorization": "Bearer test-admin-key"},
+        )
+        assert response.status_code == 200
+
+    def test_invalid_key_rejected(self, client_with_auth):
+        """Test that invalid keys are rejected."""
+        response = client_with_auth.get(
+            "/api/v1/nodes",
+            headers={"Authorization": "Bearer invalid-key"},
+        )
+        assert response.status_code == 401
+
+    def test_missing_bearer_prefix_rejected(self, client_with_auth):
+        """Test that tokens without Bearer prefix are rejected."""
+        response = client_with_auth.get(
+            "/api/v1/nodes",
+            headers={"Authorization": "test-read-key"},
+        )
+        assert response.status_code == 401
+
+    def test_empty_auth_header_rejected(self, client_with_auth):
+        """Test that empty auth headers are rejected."""
+        response = client_with_auth.get(
+            "/api/v1/nodes",
+            headers={"Authorization": ""},
+        )
+        assert response.status_code == 401
+
+
+class TestHealthEndpoint:
+    """Tests for health check endpoint."""
+
+    def test_health_no_auth(self, client_no_auth):
+        """Test health endpoint without auth."""
+        response = client_no_auth.get("/health")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["status"] == "healthy"
+
+    def test_health_with_auth_configured(self, client_with_auth):
+        """Test health endpoint works even when auth is configured."""
+        # Health endpoint should always be accessible
+        response = client_with_auth.get("/health")
+        assert response.status_code == 200
diff --git a/tests/test_api/test_commands.py b/tests/test_api/test_commands.py
new file mode 100644
index 0000000..ecfd0c1
--- /dev/null
+++ b/tests/test_api/test_commands.py
@@ -0,0 +1,118 @@
+"""Tests for command API routes."""
+
+import pytest
+
+
+class TestSendMessage:
+    """Tests for POST /commands/send-message endpoint."""
+
+    def test_send_message_success(self, client_no_auth, mock_mqtt):
+        """Test sending a direct message."""
+        response = client_no_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Hello World",
+            },
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["success"] is True
+        assert "queued" in data["message"].lower()
+
+    def test_send_message_requires_admin(self, client_with_auth):
+        """Test sending message requires admin authentication."""
+        # Without auth
+        response = client_with_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Hello",
+            },
+        )
+        assert response.status_code == 401
+
+        # With read key (not admin)
+        response = client_with_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Hello",
+            },
+            headers={"Authorization": "Bearer test-read-key"},
+        )
+        assert response.status_code == 403
+
+        # With admin key
+        response = client_with_auth.post(
+            "/api/v1/commands/send-message",
+            json={
+                "destination": "abc123def456abc123def456abc123de",
+                "text": "Hello",
+            },
+            headers={"Authorization": "Bearer test-admin-key"},
+        )
+        assert response.status_code == 200
+
+
+class TestSendChannelMessage:
+    """Tests for POST /commands/send-channel-message endpoint."""
+
+    def test_send_channel_message_success(self, client_no_auth, mock_mqtt):
+        """Test sending a channel message."""
+        response = client_no_auth.post(
+            "/api/v1/commands/send-channel-message",
+            json={
+                "channel_idx": 1,
+                "text": "Hello Channel",
+            },
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["success"] is True
+        assert "channel 1" in data["message"].lower()
+
+    def test_send_channel_message_requires_admin(self, client_with_auth):
+        """Test sending channel message requires admin authentication."""
+        response = client_with_auth.post(
+            "/api/v1/commands/send-channel-message",
+            json={
+                "channel_idx": 1,
+                "text": "Hello",
+            },
+        )
+        assert response.status_code == 401
+
+
+class TestSendAdvertisement:
+    """Tests for POST /commands/send-advertisement endpoint."""
+
+    def test_send_advertisement_success(self, client_no_auth, mock_mqtt):
+        """Test sending an advertisement."""
+        response = client_no_auth.post(
+            "/api/v1/commands/send-advertisement",
+            json={"flood": False},
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["success"] is True
+        assert "advertisement" in data["message"].lower()
+
+    def test_send_advertisement_with_flood(self, client_no_auth, mock_mqtt):
+        """Test sending an advertisement with flood enabled."""
+        response = client_no_auth.post(
+            "/api/v1/commands/send-advertisement",
+            json={"flood": True},
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["success"] is True
+        assert "flood=True" in data["message"]
+
+    def test_send_advertisement_requires_admin(self, client_with_auth):
+        """Test sending advertisement requires admin authentication."""
+        response = client_with_auth.post(
+            "/api/v1/commands/send-advertisement",
+            json={"flood": False},
+        )
+        assert response.status_code == 401
diff --git a/tests/test_api/test_dashboard.py b/tests/test_api/test_dashboard.py
new file mode 100644
index 0000000..7d04408
--- /dev/null
+++ b/tests/test_api/test_dashboard.py
@@ -0,0 +1,62 @@
+"""Tests for dashboard API routes."""
+
+import pytest
+
+
+class TestDashboardStats:
+    """Tests for GET /dashboard/stats endpoint."""
+
+    def test_get_stats_empty(self, client_no_auth):
+        """Test getting stats with empty database."""
+        response = client_no_auth.get("/api/v1/dashboard/stats")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total_nodes"] == 0
+        assert data["active_nodes"] == 0
+        assert data["total_messages"] == 0
+        assert data["messages_today"] == 0
+        assert data["total_advertisements"] == 0
+        assert data["channel_message_counts"] == {}
+
+    def test_get_stats_with_data(
+        self, client_no_auth, sample_node, sample_message, sample_advertisement
+    ):
+        """Test getting stats with data in database."""
+        response = client_no_auth.get("/api/v1/dashboard/stats")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["total_nodes"] == 1
+        assert data["active_nodes"] == 1  # Node was just created
+        assert data["total_messages"] == 1
+        assert data["total_advertisements"] == 1
+
+
+class TestDashboardHtml:
+    """Tests for GET /dashboard/dashboard endpoint."""
+
+    def test_dashboard_html_response(self, client_no_auth):
+        """Test dashboard returns HTML."""
+        response = client_no_auth.get("/api/v1/dashboard/dashboard")
+        assert response.status_code == 200
+        assert "text/html" in response.headers["content-type"]
+        assert "<!DOCTYPE html>" in response.text
+        assert "MeshCore Hub Dashboard" in response.text
+
+    def test_dashboard_contains_stats(
+        self, client_no_auth, sample_node, sample_message
+    ):
+        """Test dashboard HTML contains stat values."""
+        response = client_no_auth.get("/api/v1/dashboard/dashboard")
+        assert response.status_code == 200
+        # Check that stats are present
+        assert "Total Nodes" in response.text
+        assert "Active Nodes" in response.text
+        assert "Total Messages" in response.text
+
+    def test_dashboard_contains_recent_data(self, client_no_auth, sample_node):
+        """Test dashboard HTML contains recent nodes."""
+        response = client_no_auth.get("/api/v1/dashboard/dashboard")
+        assert response.status_code == 200
+        assert "Recent Nodes" in response.text
+        # The node name should appear in the table
+        assert sample_node.name in response.text
diff --git a/tests/test_api/test_messages.py b/tests/test_api/test_messages.py
new file mode 100644
index 0000000..3d3b878
--- /dev/null
+++ b/tests/test_api/test_messages.py
@@ -0,0 +1,62 @@
+"""Tests for message API routes."""
+
+import pytest
+
+
+class TestListMessages:
+    """Tests for GET /messages endpoint."""
+
+    def test_list_messages_empty(self, client_no_auth):
+        """Test listing messages when database is empty."""
+        response = client_no_auth.get("/api/v1/messages")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["items"] == []
+        assert data["total"] == 0
+
+    def test_list_messages_with_data(self, client_no_auth, sample_message):
+        """Test listing messages with data in database."""
+        response = client_no_auth.get("/api/v1/messages")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+        assert data["total"] == 1
+        assert data["items"][0]["text"] == sample_message.text
+        assert data["items"][0]["message_type"] == sample_message.message_type
+
+    def test_list_messages_filter_by_type(self, client_no_auth, sample_message):
+        """Test filtering messages by type."""
+        response = client_no_auth.get("/api/v1/messages?message_type=direct")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+
+        response = client_no_auth.get("/api/v1/messages?message_type=channel")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 0
+
+    def test_list_messages_pagination(self, client_no_auth):
+        """Test message list pagination parameters."""
+        response = client_no_auth.get("/api/v1/messages?limit=25&offset=10")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["limit"] == 25
+        assert data["offset"] == 10
+
+
+class TestGetMessage:
+    """Tests for GET /messages/{id} endpoint."""
+
+    def test_get_message_success(self, client_no_auth, sample_message):
+        """Test getting a specific message."""
+        response = client_no_auth.get(f"/api/v1/messages/{sample_message.id}")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["id"] == sample_message.id
+        assert data["text"] == sample_message.text
+
+    def test_get_message_not_found(self, client_no_auth):
+        """Test getting a non-existent message."""
+        response = client_no_auth.get("/api/v1/messages/nonexistent-id")
+        assert response.status_code == 404
diff --git a/tests/test_api/test_nodes.py b/tests/test_api/test_nodes.py
new file mode 100644
index 0000000..1804f90
--- /dev/null
+++ b/tests/test_api/test_nodes.py
@@ -0,0 +1,136 @@
+"""Tests for node API routes."""
+
+import pytest
+
+
+class TestListNodes:
+    """Tests for GET /nodes endpoint."""
+
+    def test_list_nodes_empty(self, client_no_auth):
+        """Test listing nodes when database is empty."""
+        response = client_no_auth.get("/api/v1/nodes")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["items"] == []
+        assert data["total"] == 0
+
+    def test_list_nodes_with_data(self, client_no_auth, sample_node):
+        """Test listing nodes with data in database."""
+        response = client_no_auth.get("/api/v1/nodes")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+        assert data["total"] == 1
+        assert data["items"][0]["public_key"] == sample_node.public_key
+        assert data["items"][0]["name"] == sample_node.name
+
+    def test_list_nodes_pagination(self, client_no_auth, sample_node):
+        """Test node list pagination parameters."""
+        response = client_no_auth.get("/api/v1/nodes?limit=10&offset=0")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["limit"] == 10
+        assert data["offset"] == 0
+
+    def test_list_nodes_with_auth_required(self, client_with_auth):
+        """Test listing nodes requires auth when configured."""
+        # Without auth header
+        response = client_with_auth.get("/api/v1/nodes")
+        assert response.status_code == 401
+
+        # With read key
+        response = client_with_auth.get(
+            "/api/v1/nodes",
+            headers={"Authorization": "Bearer test-read-key"},
+        )
+        assert response.status_code == 200
+
+
+class TestGetNode:
+    """Tests for GET /nodes/{public_key} endpoint."""
+
+    def test_get_node_success(self, client_no_auth, sample_node):
+        """Test getting a specific node."""
+        response = client_no_auth.get(f"/api/v1/nodes/{sample_node.public_key}")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["public_key"] == sample_node.public_key
+        assert data["name"] == sample_node.name
+
+    def test_get_node_not_found(self, client_no_auth):
+        """Test getting a non-existent node."""
+        response = client_no_auth.get("/api/v1/nodes/nonexistent123")
+        assert response.status_code == 404
+
+
+class TestNodeTags:
+    """Tests for node tag endpoints."""
+
+    def test_create_node_tag(self, client_no_auth, sample_node):
+        """Test creating a node tag."""
+        response = client_no_auth.post(
+            f"/api/v1/nodes/{sample_node.public_key}/tags",
+            json={"key": "location", "value": "building-a"},
+        )
+        assert response.status_code == 201  # Created
+        data = response.json()
+        assert data["key"] == "location"
+        assert data["value"] == "building-a"
+
+    def test_get_node_tag(self, client_no_auth, sample_node, sample_node_tag):
+        """Test getting a specific node tag."""
+        response = client_no_auth.get(
+            f"/api/v1/nodes/{sample_node.public_key}/tags/{sample_node_tag.key}"
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["key"] == sample_node_tag.key
+        assert data["value"] == sample_node_tag.value
+
+    def test_update_node_tag(self, client_no_auth, sample_node, sample_node_tag):
+        """Test updating a node tag."""
+        response = client_no_auth.put(
+            f"/api/v1/nodes/{sample_node.public_key}/tags/{sample_node_tag.key}",
+            json={"value": "staging"},
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert data["value"] == "staging"
+
+    def test_delete_node_tag(self, client_no_auth, sample_node, sample_node_tag):
+        """Test deleting a node tag."""
+        response = client_no_auth.delete(
+            f"/api/v1/nodes/{sample_node.public_key}/tags/{sample_node_tag.key}"
+        )
+        assert response.status_code == 204  # No Content
+
+        # Verify it's deleted
+        response = client_no_auth.get(
+            f"/api/v1/nodes/{sample_node.public_key}/tags/{sample_node_tag.key}"
+        )
+        assert response.status_code == 404
+
+    def test_tag_crud_requires_admin(self, client_with_auth, sample_node):
+        """Test that tag CRUD operations require admin auth."""
+        # Without auth
+        response = client_with_auth.post(
+            f"/api/v1/nodes/{sample_node.public_key}/tags",
+            json={"key": "test", "value": "test"},
+        )
+        assert response.status_code == 401
+
+        # With read key (not admin)
+        response = client_with_auth.post(
+            f"/api/v1/nodes/{sample_node.public_key}/tags",
+            json={"key": "test", "value": "test"},
+            headers={"Authorization": "Bearer test-read-key"},
+        )
+        assert response.status_code == 403
+
+        # With admin key
+        response = client_with_auth.post(
+            f"/api/v1/nodes/{sample_node.public_key}/tags",
+            json={"key": "test", "value": "test"},
+            headers={"Authorization": "Bearer test-admin-key"},
+        )
+        assert response.status_code == 201  # Created
diff --git a/tests/test_api/test_telemetry.py b/tests/test_api/test_telemetry.py
new file mode 100644
index 0000000..115e7ad
--- /dev/null
+++ b/tests/test_api/test_telemetry.py
@@ -0,0 +1,58 @@
+"""Tests for telemetry API routes."""
+
+import pytest
+
+
+class TestListTelemetry:
+    """Tests for GET /telemetry endpoint."""
+
+    def test_list_telemetry_empty(self, client_no_auth):
+        """Test listing telemetry when database is empty."""
+        response = client_no_auth.get("/api/v1/telemetry")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["items"] == []
+        assert data["total"] == 0
+
+    def test_list_telemetry_with_data(self, client_no_auth, sample_telemetry):
+        """Test listing telemetry with data in database."""
+        response = client_no_auth.get("/api/v1/telemetry")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+        assert data["total"] == 1
+        assert data["items"][0]["node_public_key"] == sample_telemetry.node_public_key
+        assert data["items"][0]["parsed_data"] == sample_telemetry.parsed_data
+
+    def test_list_telemetry_filter_by_node(self, client_no_auth, sample_telemetry):
+        """Test filtering telemetry by node public key."""
+        response = client_no_auth.get(
+            f"/api/v1/telemetry?node_public_key={sample_telemetry.node_public_key}"
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+
+        response = client_no_auth.get(
+            "/api/v1/telemetry?node_public_key=nonexistent"
+        )
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 0
+
+
+class TestGetTelemetry:
+    """Tests for GET /telemetry/{id} endpoint."""
+
+    def test_get_telemetry_success(self, client_no_auth, sample_telemetry):
+        """Test getting a specific telemetry record."""
+        response = client_no_auth.get(f"/api/v1/telemetry/{sample_telemetry.id}")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["id"] == sample_telemetry.id
+        assert data["node_public_key"] == sample_telemetry.node_public_key
+
+    def test_get_telemetry_not_found(self, client_no_auth):
+        """Test getting a non-existent telemetry record."""
+        response = client_no_auth.get("/api/v1/telemetry/nonexistent-id")
+        assert response.status_code == 404
diff --git a/tests/test_api/test_trace_paths.py b/tests/test_api/test_trace_paths.py
new file mode 100644
index 0000000..7ceaa2e
--- /dev/null
+++ b/tests/test_api/test_trace_paths.py
@@ -0,0 +1,42 @@
+"""Tests for trace path API routes."""
+
+import pytest
+
+
+class TestListTracePaths:
+    """Tests for GET /trace-paths endpoint."""
+
+    def test_list_trace_paths_empty(self, client_no_auth):
+        """Test listing trace paths when database is empty."""
+        response = client_no_auth.get("/api/v1/trace-paths")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["items"] == []
+        assert data["total"] == 0
+
+    def test_list_trace_paths_with_data(self, client_no_auth, sample_trace_path):
+        """Test listing trace paths with data in database."""
+        response = client_no_auth.get("/api/v1/trace-paths")
+        assert response.status_code == 200
+        data = response.json()
+        assert len(data["items"]) == 1
+        assert data["total"] == 1
+        assert data["items"][0]["path_hashes"] == sample_trace_path.path_hashes
+        assert data["items"][0]["hop_count"] == sample_trace_path.hop_count
+
+
+class TestGetTracePath:
+    """Tests for GET /trace-paths/{id} endpoint."""
+
+    def test_get_trace_path_success(self, client_no_auth, sample_trace_path):
+        """Test getting a specific trace path."""
+        response = client_no_auth.get(f"/api/v1/trace-paths/{sample_trace_path.id}")
+        assert response.status_code == 200
+        data = response.json()
+        assert data["id"] == sample_trace_path.id
+        assert data["path_hashes"] == sample_trace_path.path_hashes
+
+    def test_get_trace_path_not_found(self, client_no_auth):
+        """Test getting a non-existent trace path."""
+        response = client_no_auth.get("/api/v1/trace-paths/nonexistent-id")
+        assert response.status_code == 404