16 Crypto & Blockchain APIs with verified auth, pricing and rate limits. 13 offer a free tier; 7 document an MCP server. Every field carries the source URL that states it.
| API | Category | Auth | Pricing | MCP | Free | Confidence |
|---|---|---|---|---|---|---|
| CoinPaprika API coinpaprika.com | Crypto & Blockchain | api_key | freemium | ● | ● | high |
| 0x 0x.org | Crypto & Blockchain | api_key | freemium | ● | ● | high |
| Alchemy alchemy.com | Crypto & Blockchain | api_key | freemium | ● | ● | high |
| Bitquery bitquery.io | Crypto & Blockchain | api_key | usage_based | ● | ● | medium |
| CoinMarketCap API coinmarketcap.com | Crypto & Blockchain | api_key | freemium | ● | ● | medium |
| Block Lottos blocklottos.com | Crypto & Blockchain | none | free | — | ● | medium |
| Blockscout blockscout.com | Crypto & Blockchain | api_key | freemium | — | ● | medium |
| Coinremitter coinremitter.com | Crypto & Blockchain | api_key | freemium | — | ● | high |
| INFURA infura.io | Crypto & Blockchain | api_key | freemium | — | ● | medium |
| Messari API messari.io | Crypto & Blockchain | api_key | freemium | — | ● | high |
| CoinGecko API coingecko.com | Crypto & Blockchain | api_key | freemium | ● | ● | medium |
| Etherscan API etherscan.io | Crypto & Blockchain | api_key | freemium | — | ● | medium |
| Coinranking API coinranking.com | Crypto & Blockchain | api_key | freemium | — | ● | medium |
| CryptAPI cryptapi.io | Crypto & Blockchain | none | usage_based | — | — | medium |
| Gemini Exchange API gemini.com | Crypto & Blockchain | api_key | — | — | — | medium |
| Kraken kraken.com | Crypto & Blockchain | api_key | — | ● | — | medium |