Cryptocurrency — entry 045 of 53
Messari
Messari's API covers on-chain and market metrics, research reports, fundraising and token-unlock data, and news/topics feeds for thousands of crypto assets, aimed at analysts and funds rather than simple price lookups. Core asset and market data now sit behind an Enterprise-gated tier alongside a self-serve API key and a pay-per-request x402 option — a narrower free surface than the API offered in earlier years.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSUnknownNot documented — test from the browser before relying on it.
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
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<a href="https://greatapis.com/api/messari/"><img src="https://greatapis.com/badge/messari.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.