Finance — entry 044 of 47
Twelve Data
Twelve Data is a multi-asset market-data API covering real-time US equities/ETFs, forex, and crypto, plus reference data and technical indicators, delivered as JSON over REST with optional WebSocket streaming, credit-metered per minute. The free Basic tier grants roughly 800 requests/day (8 API credits/min) with limited trial WebSocket access; three paid tiers scale from Grow (~$66–79/month, no daily cap, 20+ markets) to Ultra (~$832–999/month, 84 markets, 99.95% SLA).
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSEnabledCallable directly from browser JavaScript.
PricingFreemiumA usable free tier exists, with paid plans for more volume.
FormatsJSON, WebSocketResponses can be requested as JSON or WebSocket.
GreatAPIs Score
Score81
Authentication15/25API key required
Pricing17/20Freemium tier available
Docs14/20Documentation URL provided
Formats15/15Supports 2 response formats
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/twelve-data/"><img src="https://greatapis.com/badge/twelve-data.svg" alt="Scored 81 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.