Finnhub · OpenAPI Overlay 1.0.0

API Evangelist enhancements for the Finnhub API

4 actions 4 updates update extends openapi/finnhub-swagger-original.json

Derived by API Evangelist Built from the contracts Finnhub publishes. Finnhub did not publish this file.

View Overlay File View on GitHub Overlay Specification

What the actions change

x-apievangelistx-rate-limitx-streamingapi_key

Targets 2

$.info

$.securityDefinitions

OpenAPI Overlay

overlay: 1.0.0
info:
  title: API Evangelist enhancements for the Finnhub API
  version: 1.0.0
  x-description: >-
    Overlay of API Evangelist enhancements to Finnhub's official Swagger 2.0
    specification (harvested verbatim from https://finnhub.io/static/swagger.json).
    The original spec is never mutated; these actions annotate it with catalog
    cross-links and operational semantics captured elsewhere in this repository.
extends: openapi/finnhub-swagger-original.json
x-generated: '2026-07-22'
x-method: generated
actions:
  - target: $.info
    update:
      x-apievangelist:
        provider: finnhub
        rating: https://apis.io/providers/finnhub/
        agentic-access: agentic-access/finnhub-agentic-access.yml
        conventions: conventions/finnhub-conventions.yml
        errors: errors/finnhub-problem-types.yml
        asyncapi: asyncapi/finnhub-asyncapi.yml
        tool-crosswalk: mcp/finnhub-tool-crosswalk.yml
  - target: $.info
    update:
      x-rate-limit: >-
        On top of each plan's limit there is a hard cap of 30 API calls/second;
        exceeding a limit returns HTTP 429 (https://finnhub.io/docs/api/rate-limit).
  - target: $.info
    update:
      x-streaming: >-
        Real-time trades, news, and press releases stream over
        wss://ws.finnhub.io (see asyncapi/finnhub-asyncapi.yml); one WebSocket
        connection per API key.
  - target: $.securityDefinitions
    update:
      api_key:
        x-alternative: >-
          The same key may be sent as the X-Finnhub-Token request header
          instead of the token query parameter
          (https://finnhub.io/docs/api/authentication).

Work with this as data

Every overlay here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for openapi overlays

4 MCP tools reach this

find_overlaysBrowse and filter every overlay in the catalog.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This overlay

curl "https://apis.io/api/v1/overlays/finnhub-swagger-overlay"

All openapi overlays

curl "https://apis.io/api/v1/overlays?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.