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.
Solid contracts, transparent operations, and an easy start — typically complete on four or five facets with one clear soft spot.
API Evangelist profiles Alpaca the way a machine reads it — 77 machine-readable artifacts across 2 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 59.7/100 (strong), with a separate agent-readiness read of 53/100 (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. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-10 · rubric v0.20.0
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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 17
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 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 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.
Scroll within the panel for all 17 ·
Postman Collections 22
A runnable collection turns the contract into something a developer can execute in seconds. We profile them because the fastest way to trust an API is to make a real call against it.
Ready-to-run Postman collections for exercising this provider's APIs.
Scroll within the panel for all 22 ·
Open Collections 26
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).
API Collection
OPEN COLLECTIONBroker Account Activities API
OPEN COLLECTIONBroker Account Activities Account Configurations API
OPEN COLLECTIONBroker Account Activities Accounts API
OPEN COLLECTIONBroker Account Activities Assets API
OPEN COLLECTIONBroker API
OPEN COLLECTIONBroker Account Activities Calendar API
OPEN COLLECTIONBroker Account Activities Clock API
OPEN COLLECTIONBroker Account Activities Corporate Actions API
OPEN COLLECTIONBroker Account Activities Crypto Pricing Data API API
OPEN COLLECTIONMarket Data API
OPEN COLLECTIONBroker Account Activities Documents API
OPEN COLLECTIONBroker Account Activities Events API
OPEN COLLECTIONBroker Account Activities Funding API
OPEN COLLECTIONBroker Account Activities Journals API
OPEN COLLECTIONBroker Account Activities Logo API
OPEN COLLECTIONBroker Account Activities News API
OPEN COLLECTIONBroker Account Activities OAuth API
OPEN COLLECTIONBroker Account Activities Orders API
OPEN COLLECTIONBroker Account Activities Portfolio History API
OPEN COLLECTIONBroker Account Activities Positions API
OPEN COLLECTIONBroker Account Activities Screener API
OPEN COLLECTIONBroker Account Activities Stock Pricing Data API API
OPEN COLLECTIONBroker Account Activities Trading API
OPEN COLLECTIONBroker Account Activities Watchlist API
OPEN COLLECTIONBroker Account Activities Watchlists API
OPEN COLLECTIONScroll within the panel for all 26 ·
MCP 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 Server
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 things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
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 7
SDKs, sample code, and the tooling you integrate with
Scroll within the panel for all 7 ·
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 3
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/alpaca · machine-readable index on apis.io
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.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.