OptimistFi Perps API

Funding, open interest, prices and leverage caps for perps on 40+ venues, in one schema.

OptimistFi Perps API is a free Cryptocurrency API that requires no API key, is served over HTTPS and supports CORS, so it can be called from the browser.

Authentication: None required
HTTPS: Yes
CORS: Yes
Category: Cryptocurrency
Uptime (30 days): 100%

Visit documentation ↗optimistfi.com

Online · 1515 msTested Nov 15, 2026 · checked dailyIs it down? Status & uptime

About OptimistFi

Free JSON API for perpetual futures on Hyperliquid, trade.xyz, Lighter, Aster and 40 more venues: one normalized schema for funding, open interest.

Provider: OptimistFi
Website: optimistfi.com ↗

Details from optimistfi.com.

Key facts

No API key needed
100% uptime (30 days)
Callable from the browser (CORS)
HTTPS

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OptimistFi Perps API FAQ

Who provides the OptimistFi Perps API?

The OptimistFi Perps API is provided by OptimistFi (optimistfi.com). Free JSON API for perpetual futures on Hyperliquid, trade.xyz, Lighter, Aster and 40 more venues: one normalized schema for funding, open interest.

Is the OptimistFi Perps API free?

Yes. The OptimistFi Perps API is listed in the Cryptocurrency category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.

Does the OptimistFi Perps API require an API key?

No. The OptimistFi Perps API requires no authentication, so you can start making requests without signing up.

Can I call the OptimistFi Perps API from the browser?

Yes. The OptimistFi Perps API supports CORS, so front-end JavaScript can call it directly.

Does the OptimistFi Perps API support HTTPS?

Yes. The OptimistFi Perps API is served over HTTPS, so it's safe to use in production.

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