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Alpaca

US stock market data with explicit IEX or consolidated SIP feed selection, historical REST queries, and live WebSocket streams.

Scope and request shape

This profile focuses on US equities market data for individual Trading API users. The official overview separates those subscriptions from Broker API arrangements. Market-data requests use the data host, not the trading/order host.

curl --get 'https://data.alpaca.markets/v2/stocks/bars' \
  -H "APCA-API-KEY-ID: $APCA_API_KEY_ID" \
  -H "APCA-API-SECRET-KEY: $APCA_API_SECRET_KEY" \
  --data-urlencode 'symbols=AAPL' \
  --data-urlencode 'timeframe=1Day' \
  --data-urlencode 'start=2024-01-02T00:00:00Z' \
  --data-urlencode 'end=2024-01-06T00:00:00Z' \
  --data-urlencode 'feed=sip' \
  --data-urlencode 'adjustment=raw'

This is an illustrative historical request, not a recorded live response. Keep credentials in a server-side secret store and never include them in a URL, frontend bundle, or diagnostic log. Follow every next_page_token with page_token; one successful page is not a complete multi-symbol dataset.

Choose coverage before latency

Use the recent SIP error guide to choose a delayed consolidated query or an explicitly IEX-only workflow. Preserve the feed and requested interval with cached data. Changing the feed to make an error disappear changes the dataset.

The current Python SDK is alpaca-py. No SDK installation, authenticated API call, order, or paid subscription was tested for this profile.

Separate asset-catalog contract

The TXSE SDK enum case concerns read-only Trading Assets metadata, not this profile’s Market Data v2 host, subscription prices or limits. Alpaca’s Assets SDK reference defines that separate surface. The source review dated 2026-10-27 did not execute an account request or order; existing market-data fact dates above are unchanged.

Integration surface

Versioning
This profile covers US stock Market Data REST v2; other asset classes and brokerage APIs have separate contracts.
Resource groups
Stock bars, Stock trades, Stock quotes, Stock snapshots
Pagination
Historical stock bars return next_page_token; send it as page_token until absent. The limit is shared across symbols.
Errors
Inspect HTTP status and the JSON error body separately. Code 42210000 identifies the documented recent-SIP subscription error; it is not an HTTP status.
Webhooks
The reviewed market-data documentation describes WebSocket streams; a general webhook delivery contract was not verified.
Official SDKs
Python (alpaca-py), Go, NodeJS, C#

Practical integration cases