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 OAuth.
Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.
API Evangelist profiles Alpaca the way a machine reads it — 39 machine-readable artifacts across 23 APIs, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Alpaca scores 86.4/100 (exemplar), with a separate agent-readiness read of 90/100 (agent native). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
How we profile Alpaca
Each block below is one kind of artifact we hold for Alpaca. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 23
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
Individual APIs this provider publishes, each with its own machine-readable definition.
Alpaca Trading API
The Alpaca Trading API enables commission-free trading of US-listed equities, options, and crypto. It exposes endpoints for orders, positions, account information, watchlists, c...
Alpaca OAuth API
The Alpaca OAuth API allows third-party applications to authenticate Alpaca users and obtain access tokens for the Trading and Market Data APIs.
Alpaca Account Activities API
Head to https://alpaca.markets/docs/api-references/trading-api/account-activities/ to view complete documentation on the Account Activities API.
Alpaca Account Configurations API
Head to https://alpaca.markets/docs/api-documentation/api-v2/account-configuration/ to view complete documentation on the Account Configurations API.
Alpaca Accounts API
The Accounts API from Alpaca — 14 operation(s) for accounts.
Alpaca Assets API
The Assets API from Alpaca — 2 operation(s) for assets.
Alpaca Calendar API
The Calendar API from Alpaca — 2 operation(s) for calendar.
Alpaca Clock API
The Clock API from Alpaca — 2 operation(s) for clock.
Alpaca Corporate Actions API
The Corporate Actions API from Alpaca — 1 operation(s) for corporate actions.
Alpaca Crypto Pricing Data API API
The Crypto Pricing Data API API from Alpaca — 17 operation(s) for crypto pricing data api.
Alpaca Documents API
The Documents API from Alpaca — 3 operation(s) for documents.
Alpaca Events API
The Events API from Alpaca — 4 operation(s) for events.
Alpaca Funding API
The Funding API from Alpaca — 7 operation(s) for funding.
Alpaca Journals API
The Journals API from Alpaca — 4 operation(s) for journals.
Alpaca Logo API
The Logo API from Alpaca — 1 operation(s) for logo.
Alpaca News API
The News API from Alpaca — 1 operation(s) for news.
Alpaca Orders API
Head to https://alpaca.markets/docs/api-documentation/api-v2/orders/ to view complete documentation on the Orders API.
Alpaca Portfolio History API
Head to https://alpaca.markets/docs/api-documentation/api-v2/portfolio-history/ to view complete documentation on the Portfolio History API.
Alpaca Positions API
Head to https://alpaca.markets/docs/api-documentation/api-v2/positions/ to view complete documentation on the Positions API.
Alpaca Screener API
The Screener API from Alpaca — 1 operation(s) for screener.
Alpaca Stock Pricing Data API API
The Stock Pricing Data API API from Alpaca — 16 operation(s) for stock pricing data api.
Alpaca Watchlist API
The Watchlist API from Alpaca — 2 operation(s) for watchlist.
Alpaca Watchlists API
Head to https://alpaca.markets/docs/api-documentation/api-v2/watchlist/ to view complete documentation on the Watchlist API.
Scroll within the panel for all 23 ·
Open Collections 4
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
Broker API
OPEN COLLECTIONMarket Data API
OPEN COLLECTIONOAuth API
OPEN COLLECTIONTrader API
OPEN COLLECTIONMCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
alpaca-mcp.yml
MCP SERVERPricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the six things the Kin Score reads for commercial clarity.
Published pricing tiers and plan structures.
Alpaca Plans Pricing
PLANSRate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Alpaca Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Alpaca Finops
FINOPSEvent Specifications 1
Not every API is request/response. AsyncAPI describes the event-driven and streaming side — the webhooks and channels — so the asynchronous half of the interface is documented the same way the synchronous half is.
AsyncAPI definitions for this provider's event-driven and streaming APIs.
Alpaca WebSocket Streaming APIs
AsyncAPI 2.6 description of Alpaca's public WebSocket streaming APIs. Covers real-time stock market data (IEX / SIP / delayed SIP / BOATS), real-time crypto market data (US and ...
ASYNCAPISpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Alpaca API Rules
SPECTRALSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Scopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Alpaca — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 4
Portal, sign-up, and the first successful call
Documentation 2
Reference material describing how the API behaves
Agent Surfaces 6
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 6
Pagination, idempotency, versioning, errors, and events
Build 6
SDKs, sample code, and the tooling you integrate with
Access & Security 7
Authentication, authorization, and security posture
Scroll within the panel for all 7 ·
Operate 5
Status, limits, changes, and where to get help
Commercial 5
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
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