Cryptocurrency — entry 049 of 53
Poloniex
Poloniex's REST and WebSocket APIs cover spot trading, margin, and futures across hundreds of markets, with public market-data endpoints open with no key and private trading/account endpoints secured by an API key and HMAC-signed requests. The exchange, founded in the US, has changed hands several times (Circle, then a Justin Sun-linked consortium via Polo Digital Assets) and suffered a major 2023 hot-wallet hack, though its documented API has remained live and versioned since.
AuthenticationAPI KeySign up with the provider to obtain credentials.
HTTPSSupportedTraffic is encrypted in transit.
CORSDisabledBrowser calls need a server-side proxy.
PricingFreeNo paid tier — free for the documented use case.
FormatsJSON, WebSocketResponses can be requested as JSON or WebSocket.
GreatAPIs Score
Score84
Authentication15/25API key required
Pricing20/20Free to use
Docs14/20Documentation URL provided
Formats15/15Supports 2 response formats
Freshness20/20Verified within 6 months
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<a href="https://greatapis.com/api/poloniex/"><img src="https://greatapis.com/badge/poloniex.svg" alt="Scored 84 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.