Open Data — entry 027 of 44
OpenCorporates
OpenCorporates exposes the world's largest open database of company records — officers, filings, jurisdiction codes, and corporate structures for 200+ million entities across 140+ jurisdictions. Every call requires an api_token query parameter; open-data and non-commercial projects get a free tier capped at 200 requests/month and 50/day, while higher-volume or commercial use requires a paid plan.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSDisabledBrowser calls need a server-side proxy.
PricingFreemiumA usable free tier exists, with paid plans for more volume.
FormatsJSONResponses can be requested as JSON.
GreatAPIs Score
Score75
Authentication15/25API key required
Pricing17/20Freemium tier available
Docs14/20Documentation URL provided
Formats9/15Single response format
Freshness20/20Verified within 6 months
Embed this badge
<a href="https://greatapis.com/api/opencorporates/"><img src="https://greatapis.com/badge/opencorporates.svg" alt="Scored 75 on greatapis.com"></a>Auth quickstart
- Sign up with the provider to get an API key.
- Send it on every request as a header
Authorization: <key> - The exact header isn't documented — Authorization is a common default; confirm in the provider's docs.
Stored keyNo key stored
Your key is stored only in this browser (localStorage) and sent directly to the API — never to greatapis.
Developer reference
Base URL
https://api.opencorporates.com/v0.4