OptimistFi Perps API alternatives

Funding, open interest, prices and leverage caps for perps on 40+ venues, in one schema. If it doesn't fit your project, here are the 10 best free Cryptocurrency APIs to use instead in 2026, out of 107 in the directory.

For reference, OptimistFi Perps API: No API key needed · 100% uptime (30 days) · Callable from the browser (CORS).

1. 1

   CorpStacking API

   Online · 691 ms

   Corporate, government and ETF Bitcoin, Ethereum and Solana treasury disclosures.

   • No API key needed
   • 100% uptime (30 days)
   • Returns JSON at its URL
   • Callable from the browser (CORS)

   No authHTTPSCORS
2. 2

   DefiLlama API

   Online · 1125 ms

   Open and transparent DeFi data, TVL, coin prices, volumes, and yields.

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

   No authHTTPSCORS
3. 3

   0x API

   Online · 4085 ms

   API for querying token and pool stats across various liquidity pools.

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

   No authHTTPSCORS
4. 4

   Alpha (Mossland) API

   Online · 2648 ms

   Korean crypto channel stance + RAG Q&A + canonical entity/topic/event store.

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

   No authHTTPSCORS
5. 5B

   Block Lottos API

   Online · 2188 ms

   On-chain lottery, draw history, jackpot and advertising endpoints.

   • No API key needed
   • 100% uptime (30 days)
   • Returns JSON at its URL
   • Callable from the browser (CORS)

   No authHTTPSCORS
6. 6

   BTCGlobe API

   Online · 1526 ms

   Bitcoin height, fees, mempool and peer data served live from two self-hosted nodes.

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

   No authHTTPSCORS
7. 7

   CoinLobster API

   Online · 1893 ms

   Live executed whale trades across 15 exchanges and on-chain DEX with an unusualness radar.

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

   No authHTTPSCORS
8. 8

   Coinpaprika API

   Online · 1308 ms

   Cryptocurrencies prices, volume and more.

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

   No authHTTPSCORS
9. 9

   CoinXview API

   Online · 4266 ms

   Real-time crypto prices aggregated from 22 exchanges, OHLC, market stats, Fear & Greed.

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

   No authHTTPSCORS
10. 10

    FraudCoins API

    Online · 2633 ms

    On-chain top-10 holder concentration and contract permissions for crypto tokens.

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

    No authHTTPSCORS

OptimistFi Perps API vs alternatives

OptimistFi Perps API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
OptimistFi Perps	No	Yes	Yes	100%	1515 ms	Not rated
CorpStacking	No	Yes	Yes	100%	691 ms	Not rated
DefiLlama	No	Yes	Yes	100%	1125 ms	Not rated
0x	No	Yes	Yes	100%	4085 ms	Not rated
Alpha (Mossland)	No	Yes	Yes	100%	2648 ms	Not rated
BBlock Lottos	No	Yes	Yes	100%	2188 ms	Not rated
BTCGlobe	No	Yes	Yes	100%	1526 ms	Not rated
CoinLobster	No	Yes	Yes	100%	1893 ms	Not rated
Coinpaprika	No	Yes	Yes	100%	1308 ms	Not rated

See also: best Cryptocurrency APIs · all Cryptocurrency APIs