alpaca-broker-market-data
Alpaca Market Data API — Stocks (REST + WebSocket)
Real-time and historical US equity data. Unlike the Broker endpoints, market data lives on its own host with its own auth, and the real-time feed is WebSocket, not SSE.
Read
alpaca-broker-integrationfirst. Assets/clock/calendar live on the Trading API host; everything else here is the Market Data API host.
Reference
- Guides:
https://docs.alpaca.markets/docs/historical-stock-data,https://docs.alpaca.markets/docs/streaming-market-data - Live schema:
alpaca-docsMCP →list-endpointstitle"Market Data API"
0. Hosts & auth
| Surface | Host |
|---|---|
| Market data REST | https://data.alpaca.markets (sandbox data.sandbox.alpaca.markets) |
| Market data WebSocket | wss://stream.data.alpaca.markets/{version}/{feed} |
| Assets / clock / calendar | https://api.alpaca.markets (Trading API) — paper: paper-api.alpaca.markets |
Auth: Broker partners authenticate with a client-credentials access token (POST https://authx.alpaca.markets/v1/oauth2/token — flow in alpaca-broker-integration): send Authorization: Bearer <token> on REST and on the WS handshake, or authenticate over WS with {"action":"auth","key":"access_token","secret":"<token>"} (the literal string access_token is the key). Tokens are valid 15 minutes — cache and refresh one, don't mint per call. Key/secret (APCA-API-* headers, or {"action":"auth","key":"…","secret":"…"} on WS) is the Trading API path and the documented legacy Broker path.