Blockchain APIs
15 free public APIs in this category
| API | Auth | HTTPS | CORS | |
|---|---|---|---|---|
| Bitquery Onchain GraphQL APIs & DEX APIs | API Key | Yes | Yes | ↗ |
| Blockscout Multichain block explorer REST API (with Etherscan-compatible JSON-RPC) | API Key | Yes | No | ↗ |
| Chainlink Build hybrid smart contracts with Chainlink | No auth | Yes | Unknown | ↗ |
| Chainpoint Chainpoint is a global network for anchoring data to the Bitcoin blockchain | No auth | Yes | Unknown | ↗ |
| ClearTrace Cross-frontend DEX attribution and execution quality data across Ethereum and L2s | No auth | Yes | Yes | ↗ |
| Covalent Multi-blockchain data aggregator platform | API Key | Yes | Unknown | ↗ |
| Etherscan Ethereum explorer API | API Key | Yes | Yes | ↗ |
| Get Started with Web3 Bilingual Web3 lessons, glossary search and role-based learning paths | No auth | Yes | Yes | ↗ |
| Helium Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage | No auth | Yes | Unknown | ↗ |
| Nownodes Blockchain-as-a-service solution that provides high-quality connection via API | API Key | Yes | Unknown | ↗ |
| Steem Blockchain-based blogging and social media website | No auth | No | No | ↗ |
| The Graph Indexing protocol for querying networks like Ethereum with GraphQL | API Key | Yes | Unknown | ↗ |
| TWZRD Agent Intel Solana on-chain agent trust scoring via MCP; 4 free tools to score, resolve and verify AI agent wallets | No auth | Yes | Yes | ↗ |
| Walltime To retrieve Walltime's market info | No auth | Yes | Unknown | ↗ |
| Watchdata Provide simple and reliable API access to Ethereum blockchain | API Key | Yes | Unknown | ↗ |