Alpaca
Alpaca is an API-first commission-free stock and crypto trading broker offering trading, market data, options, and broker-as-a-service APIs. Alpaca publishes its OpenAPI specifications publicly via the alpacahq/alpaca-docs GitHub repository, with separate specs for Trading, Broker, Market Data, and
2 channels
across 1 AsyncAPI spec
· Provider profile
Channels
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The single root WebSocket path used by every market data stream (stocks, crypto, news, and the test feed). All control messages (auth, subscribe, unsubscribe) and all data messages flow over this pathAlpaca WebSocket Streaming APIs
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The trade_updates stream delivers order lifecycle events for a single Alpaca trading account. The client first authenticates with an "auth" action, then subscribes by sending a "listen" action whose dAlpaca WebSocket Streaming APIs