Alpaca
Alpaca is a developer-first, commission-free brokerage that exposes stock, ETF, options, and crypto trading and market data entirely through APIs. The Trading API places and manages orders against a free paper-trading sandbox (paper-api.alpaca.markets) or a live account (api.alpaca.markets/v2); the Market Data API serves historical and real-time stocks, crypto, options, news, and corporate actions over REST plus WebSocket streams (data.alpaca.markets and stream.data.alpaca.markets); and the Broker API lets businesses open and fund end-user brokerage accounts. Authentication uses APCA-API-KEY-ID and APCA-API-SECRET-KEY headers, with OAuth2 available for third-party apps.
Alpaca publishes 16 APIs on the APIs.io network, including Market Data Streaming API, Account API, Assets API, and 13 more. Tagged areas include Market Data, Trading, Brokerage, Stocks, and Crypto.
The Alpaca catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.
Alpaca’s developer surface includes documentation, engineering blog, and 7 more developer resources.
Kin Score
APIs 16
Individual APIs this provider publishes, each with its own machine-readable definition.
Alpaca Market Data Streaming API
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/v1...
Alpaca Account API
Trading account details, configuration, and activities.
Alpaca Assets API
Tradable asset catalog.
Alpaca Broker - Accounts API
Open and manage end-user brokerage accounts.
Alpaca Broker - Funding API
Transfers and journals between accounts.
Alpaca Broker - Trading API
Place orders on behalf of end-user accounts.
Alpaca Market API
Market calendar and clock.
Alpaca Market Data - Crypto API
Historical and latest crypto bars, trades, quotes, and orderbooks (v1beta3).
Alpaca Market Data - News API
Real-time and historical market news (v1beta1).
Alpaca Market Data - Options API
Options bars, trades, and snapshots (v1beta1).
Alpaca Market Data - Screener API
Most-actives and movers screeners (v1beta1).
Alpaca Market Data - Stocks API
Historical and latest stock bars, trades, quotes, snapshots, and auctions.
Alpaca Orders API
Submit, list, replace, and cancel orders.
Alpaca Portfolio API
Portfolio history and performance.
Alpaca Positions API
Open positions and liquidation.
Alpaca Watchlists API
User watchlists.
Scroll for all 16
Open Collections 1
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Alpaca API
OPEN COLLECTIONPricing Plans 1
Published pricing tiers and plan structures.
Rate Limits 1
Documented rate limits and quota policies.
Alpaca Markets Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals for API financial operations.
Alpaca Markets Finops
FINOPSEvent Specifications 1
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Alpaca Market Data Streaming (WebSocket)
AsyncAPI 2.6 description of Alpaca's **real-time market data WebSocket API**. Unlike many providers, Alpaca publishes a genuine, documented public WebSocket (`wss://`) surface f...
ASYNCAPISpectral Rules 1
Spectral governance rulesets for linting and validating these APIs.
Alpaca API Rules
SPECTRALAgentic Access 1
Recommended x-agentic-access execution contracts for AI agents.
Resources
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Operate 1
Status, limits, changes, and where to get help
Commercial 2
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
Source (apis.yml)
This is an independent, third-party profile of Alpaca, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
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