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 26 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

42.5/100 developing ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent Heartbeat 92/100 alive saas Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

2 published contracts 3 Agent Skills

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

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 42.5/100 · developing

Contract Quality 9.5 / 19

Developer Ergonomics 6.5 / 15

Access Clarity 8.9 / 15

Operational Transparency 1.2 / 10

Contract Governance 1.4 / 9

Discoverability 5.0 / 8

Regulatory Posture 2.9 / 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

MCP Tool Quality 6 / 6

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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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →

7 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 50.9 — up to +12.3 composite points Ask about this →
Operational Transparency scores 11.9 — up to +11.5 composite points Ask about this →
Developer Ergonomics scores 43.5 — up to +11.3 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

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 the provider profile at artifacts.apis.io/finnhub/apis.yml: open an issue on github.com/api-evangelist/finnhub to ask a question or point us at an artifact you publish. 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	distribution	21.7	-	-
Official SDKs on Packagist, pub.dev and Hex	distribution	21.7	-	-

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 2

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

OpenAPI

measured — observed by APIs.io (published)

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

Agent Skills 3

Packaged agent skills for driving this provider's APIs from an AI assistant.

Research a public company

AGENT SKILL

Fetch OHLCV candles across stocks, forex, and crypto

AGENT SKILL

Get a real-time stock quote

AGENT SKILL

Finnhub API pricing

Prices published by Finnhub, read 2026-10-28 from finnhub.io/pricing.

Plan	Price
Free	$0/month Includes: Personal Use. Terms apply; US fundamental/market data coverage
All-In-One	$3500/month Includes: Global coverage; billing frequency annually; All-in-One plan doesn't include access to Earnings call

Plan details, limits and sources →

Rate limits

Global Per-Second Cap (published): 30 requests per second
Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month

Compiled by API Evangelist, not yet checked against Finnhub's documentation. All 6 limits →

Billed by: subscription · FinOps profile →

Pricing Plans 2

Published pricing tiers and plan structures.

Finnhub Plans Pricing

2 plans

PLANS

Finnhub Price Estimates

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Finnhub Rate Limits

6 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Finnhub

7 quoted statements, read from Finnhub's own page on 2026-11-09.

TERMS

Eligibility 1

Who may sign up and where, quoted from its own terms.

Finnhub

4 quoted statements, read from Finnhub's own page on 2026-11-09.

ELIGIBILITY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

Finnhub

2 quoted statements, read from Finnhub's own page on 2026-11-09.

LICENSE

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. Counts are the severity each rule declares, not results of running them.

Finnhub — asyncapi rules

6 rules · 1 error-severity 5 warn-severity

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 (API Evangelist recommendations) 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 6

Pricing, plans, and the legal terms of use

Plans

FinOps

TermsOfService

Pricing

UsageTerms

DataLicense

Company 2

The organization behind the API

LinkedIn

Website

Website

Other 2

Properties that don't map to a standard resource type

Overlay

Overlay

Eligibility

Eligibility

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
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  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
- type: UsageTerms
  url: terms/finnhub-terms-of-service.yml
- type: Eligibility
  url: eligibility/finnhub-eligibility.yml
- type: DataLicense
  url: data-license/finnhub-data-license.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Finnhub API — frequently asked questions

Does Finnhub have an API?

Yes. APIs.io lists 1 API from Finnhub, including Finnhub Default API.

Is there an OpenAPI specification for the Finnhub API?

Yes. APIs.io indexes 1 OpenAPI specification for Finnhub, each linked for download from this page.

How do I authenticate with the Finnhub API?

Finnhub uses bearer-token authentication (apiKey · 2 schemes). The details are profiled on APIs.io as Finnhub Authentication.

How much does the Finnhub API cost?

Finnhub publishes its prices; its Free plan is $0/month as of 2026-10-28. APIs.io lists 2 pricing plans for Finnhub, with each plan's price, limits and inclusions under Pricing on this page.

Is the Finnhub API ready for AI agents?

Finnhub has a Kin Score of 42.5 out of 100 (developing) and an Agent Readiness score of 23.6 (agent-aware), scored by API Evangelist on 2026-11-13.

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