# Alpaca Market Data Streaming API

**Canonical:** https://apis.io/apis/alpaca-markets/alpaca-markets-streaming-api/  
**Provider:** Alpaca — https://apis.io/providers/alpaca-markets/  
**Base URL:** wss://stream.data.alpaca.markets  
**Documentation:** https://docs.alpaca.markets/docs/streaming-market-data

Alpaca Market Data Streaming API is one of 16 APIs that [Alpaca](https://apis.io/providers/alpaca-markets/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include Streaming, WebSocket, Market Data, Real-Time, and Trading. The published artifact set on APIs.io includes API documentation, an API reference, and an AsyncAPI specification.

Real-time market data over WebSocket. Stocks stream at wss://stream.data.alpaca.markets/v2/{feed} (iex, sip, delayed_sip, test) and crypto at wss://stream.data.alpaca.markets/v1beta3/crypto/us. Authenticate with an auth message, then subscribe to trades, quotes, bars, dailyBars, updatedBars, statuses, lulds, and (crypto) orderbooks per symbol or with a wildcard. This is a documented public wss:// API.

## Machine-readable artifacts (4)

- **Documentation** — https://docs.alpaca.markets/docs/streaming-market-data
- **APIReference** — https://docs.alpaca.markets/docs/real-time-crypto-pricing-data
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/alpaca-markets/refs/heads/main/asyncapi/alpaca-markets-asyncapi.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/alpaca-markets/refs/heads/main/apis.yml

## Other Alpaca APIs (12)

- [Alpaca Account API](https://apis.io/apis/alpaca-markets/alpaca-markets-account-api/)
- [Alpaca Assets API](https://apis.io/apis/alpaca-markets/alpaca-markets-assets-api/)
- [Alpaca Broker - Accounts API](https://apis.io/apis/alpaca-markets/alpaca-markets-broker-accounts-api/)
- [Alpaca Broker - Funding API](https://apis.io/apis/alpaca-markets/alpaca-markets-broker-funding-api/)
- [Alpaca Broker - Trading API](https://apis.io/apis/alpaca-markets/alpaca-markets-broker-trading-api/)
- [Alpaca Market API](https://apis.io/apis/alpaca-markets/alpaca-markets-market-api/)
- [Alpaca Market Data - Crypto API](https://apis.io/apis/alpaca-markets/alpaca-markets-market-data-crypto-api/)
- [Alpaca Market Data - News API](https://apis.io/apis/alpaca-markets/alpaca-markets-market-data-news-api/)
- [Alpaca Market Data - Options API](https://apis.io/apis/alpaca-markets/alpaca-markets-market-data-options-api/)
- [Alpaca Market Data - Screener API](https://apis.io/apis/alpaca-markets/alpaca-markets-market-data-screener-api/)
- [Alpaca Market Data - Stocks API](https://apis.io/apis/alpaca-markets/alpaca-markets-market-data-stocks-api/)
- [Alpaca Orders API](https://apis.io/apis/alpaca-markets/alpaca-markets-orders-api/)

## Tags

Streaming, WebSocket, Market Data, Real-Time, Trading

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/alpaca-markets/alpaca-markets-streaming-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/alpaca-markets/.