Finnhub

With the sole mission of democratizing financial data, we are proud to offer a FREE realtime API for stocks, forex and cryptocurrency. With this API, you can access realtime market data from stock exchanges, 10 forex brokers, and 15+ crypto exchanges.

Finnhub publishes 1 API contract indexed on the APIs.io network: Default API. Tagged areas include Finance, Market Data, Stocks, Foreign Exchange, and Cryptocurrency.

The Finnhub catalog on APIs.io includes 1 event-driven AsyncAPI specification and 1 Spectral governance ruleset.

Finnhub’s developer surface includes authentication, documentation, API reference, support, pricing, signup flow, and 23 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

39.7/100 developing ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent saas Full breakdown ↓
scored 2026-10-23 · rubric v0.25.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

2 published contracts

Finance Market Data Stocks Foreign Exchange Cryptocurrency Fundamentals News WebSocket Real-Time Financial Data

Kin Score

Kin Score How this is scored →
scored 2026-10-23 · rubric v0.25.0

Composite quality — 39.7/100 · developing

Contract Quality 9.5 / 19

Developer Ergonomics 6.5 / 15

Access Clarity 6.3 / 15

Operational Transparency 1.0 / 10

Contract Governance 1.4 / 9

Discoverability 5.0 / 8

Regulatory Posture 3.8 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 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 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 3 / 3

Regulatory Posture applies to this provider. Its tags matched the Securities & Market Data regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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<a href="https://apis.io/providers/finnhub/"><img src="https://apis.io/badge/finnhub/card.svg" alt="Finnhub on APIs.io — Kin Score by API Evangelist"></a>

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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/finnhub: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Capital Markets and Trading	undeclared	-	-	-
Official SDKs on Packagist, pub.dev and Hex	undeclared	-	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

WebSockets

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

APIs 1

Individual APIs this provider publishes, each with its own machine-readable definition.

Finnhub Default API

The Default API from Finnhub — 117 operation(s) for default.

Open Collections 9

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Finnhub Company News API

OPEN COLLECTION

Finnhub Company News Crypto API

OPEN COLLECTION

Finnhub Company News Forex API

OPEN COLLECTION

Finnhub Company News API

OPEN COLLECTION

Finnhub Company News Quote API

OPEN COLLECTION

Finnhub Company News Search API

OPEN COLLECTION

Finnhub Company News Stock API

OPEN COLLECTION

Finnhub API

OPEN COLLECTION

Finnhub API

OPEN COLLECTION

Scroll for all 9

Pricing Plans 1

Published pricing tiers and plan structures.

Finnhub Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Finnhub Rate Limits

6 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Finnhub Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Finnhub WebSocket API

AsyncAPI specification for Finnhub's real-time streaming WebSocket APIs. A single WebSocket endpoint (wss://ws.finnhub.io) multiplexes three documented streams selected by the e...

ASYNCAPI

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Finnhub — asyncapi rules

6 rules · 1 errors 5 warnings

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Finnhub Swagger Overlay

4 actions · update · finnhub-swagger-original.json

DERIVED

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Finnhub Authentication

apiKey · 2 schemes

SECURITY

Finnhub Domain Security

TLSv1.2

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Finnhub Agentic Access

117 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 3

Reference material describing how the API behaves

OpenAPI

OpenAPI

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

X-MCPServerCandidate

X-MCPServerCandidate

LLMsTxt

LLMsTxt

AgentSkill

AgentSkill

Design & Contract 5

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

DataModel

Build 5

SDKs, sample code, and the tooling you integrate with

Packages

SDKs

ToolCrosswalk

Postman

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 4

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

Pricing

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: finnhub
name: Finnhub
description: With the sole mission of democratizing financial data, we are proud to offer a FREE realtime API for stocks,
  forex and cryptocurrency. With this API, you can access realtime market data from stock exchanges, 10 forex brokers, and
  15+ crypto exchanges.
kind: contract
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/finnhub.png
access: 3rd-Party
created: '2025-02-08'
modified: '2026-09-16'
position: Consuming
tags:
- Finance
- Market Data
- Stocks
- Foreign Exchange
- Cryptocurrency
- Fundamentals
- News
- WebSocket
- Real-Time
- Financial Data
tags_raw:
- Financial
- Market Data
- Stocks
- Forex
- Cryptocurrency
- Fundamentals
- News
- WebSocket
- Real-Time
- Financial Data
url: https://raw.githubusercontent.com/api-evangelist/finnhub/refs/heads/main/apis.yml
specificationVersion: '0.23'
apis:
- aid: finnhub:finnhub-default-api
  name: Finnhub Default API
  description: The Default API from Finnhub — 117 operation(s) for default.
  humanURL: https://finnhub.io/docs/api
  baseURL: https://finnhub.io/api/v1
  tags: []
  tags_raw:
  - Default
  properties:
  - type: OpenAPI
    url: openapi/finnhub-default-api-openapi.yml
common:
- type: AgenticAccess
  url: agentic-access/finnhub-agentic-access.yml
- type: DomainSecurity
  url: security/finnhub-domain-security.yml
- type: Authentication
  url: authentication/finnhub-authentication.yml
- type: OpenAPI
  url: openapi/_original/finnhub-swagger-original.json
- type: Packages
  url: packages/finnhub-packages.yml
- type: SDKs
  url: packages/finnhub-packages.yml
- type: X-MCPServerCandidate
  url: mcp/finnhub-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- type: ToolCrosswalk
  url: mcp/finnhub-tool-crosswalk.yml
- type: LLMsTxt
  url: llms/finnhub-llms.txt
- type: Overlay
  url: overlays/finnhub-swagger-overlay.yaml
- type: Conformance
  url: conformance/finnhub-conformance.yml
- type: ErrorCatalog
  url: errors/finnhub-problem-types.yml
- type: Lifecycle
  url: lifecycle/finnhub-lifecycle.yml
- type: Conventions
  url: conventions/finnhub-conventions.yml
- type: DataModel
  url: data-model/finnhub-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
- type: RateLimits
  url: rate-limits/finnhub-rate-limits.yml
- type: Plans
  url: plans/finnhub-plans-pricing.yml
- type: FinOps
  url: finops/finnhub-finops.yml
- type: Postman
  url: collections/finnhub.postman_collection.json
- type: LinkedIn
  url: https://www.linkedin.com/company/finnhub
- type: Website
  url: https://finnhub.io/
- type: Documentation
  url: https://finnhub.io/docs/api
- type: APIReference
  url: https://finnhub.io/docs/api
- type: GitHubOrganization
  url: https://github.com/Finnhub-Stock-API
- type: Support
  url: mailto:support@finnhub.io
- type: TermsOfService
  url: https://finnhub.io/terms-of-service
- type: Pricing
  url: https://finnhub.io/pricing
- type: Signup
  url: https://finnhub.io/register
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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