Finding a good free crypto API is harder than it should be. Most "free" tiers are so rate-limited they're useless for real applications. Here's the truth about free crypto APIs in 2026.
| API | Free Tier | Limits | MCP |
|---|---|---|---|
| CryptoBoss | $1 free credit | Pay per use | 44+ tools |
| CoinGecko | Free with signup | 10-30 req/min | No |
| CoinMarketCap | Free with signup | 333 req/day | No |
| Binance | Free with KYC | 1200 req/min | No |
The Problem with "Free" APIs
Every free tier limits you. 10 requests per minute works for a hobby project but breaks for any real application. And none support MCP, meaning your AI agent can't use them natively.