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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.

agent native

Reference-quality API operations across every facet — a rich contract, published governance, transparent operations, and machine-readable commercial terms.

Kin Score

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.

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 86.4/100 · exemplar
Contract Quality 17.3 / 25
Developer Ergonomics 18.3 / 20
Commercial Clarity 20.0 / 20
Operational Transparency 11.3 / 13
Governance 7.3 / 12
Discoverability 10.0 / 10
Regulatory · Securities & Market Data 15.0 / 15
Agent readiness — 90/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 9 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3

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 COLLECTION

Market Data API

OPEN COLLECTION

OAuth API

OPEN COLLECTION

Trader API

OPEN COLLECTION

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.yml

MCP SERVER

Pricing 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

3 plans

PLANS

Rate 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

5 limits

RATE LIMITS

FinOps 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.

Event 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 ...

ASYNCAPI

Spectral 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

6 rules · 1 errors · 4 warnings

SPECTRAL

Security 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.

Alpaca Authentication

apiKey/http/oauth2 · 5 schemes

SECURITY

Alpaca Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Alpaca Vulnerability Disclosure

Hackerone · contact published

SECURITY

Alpaca Trust Center

SOC 2 Type 2, ISO 27001:2022, GDPR, UK ICO Data Protection

SECURITY

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.

Alpaca Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

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.

Alpaca Agentic Access

119 operations · 39 acting

119 operations · 39 acting

AGENTIC

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

Company 2

The organization behind the API

← All providers · Data indexed from github.com/api-evangelist/alpaca · machine-readable index on apis.io