Blockchain APIs provide access to cryptocurrency data, smart contracts, and decentralized networks. Query transaction histories, wallet balances, and real-time market data for Bitcoin, Ethereum, and thousands of altcoins.
Last verified: November 12, 2026
| Name | Description | Auth | HTTPS | CORS | Uptime (30 days) |
|---|---|---|---|---|---|
| Bitquery | Onchain GraphQL APIs & DEX APIs | apikey | Yes | yes | 100% (5 checks) |
| Blockscout | Multichain block explorer REST API (with Etherscan-compatible JSON-RPC) | apikey | Yes | no | 100% (5 checks) |
| BlockVectra | EVM JSON-RPC, indexed blockchain data, and keyless chain discovery | apikey | Yes | yes | 100% (4 checks) |
| Bscscan | Binance Smart Chain explorer API | apikey | Yes | yes | 100% (5 checks) |
| Chainlink | Build hybrid smart contracts with Chainlink | none | Yes | unknown | 100% (5 checks) |
| Chainpoint | Chainpoint is a global network for anchoring data to the Bitcoin blockchain | none | Yes | unknown | 100% (5 checks) |
| ClearTrace | Cross-frontend DEX attribution and execution quality data across Ethereum and L2s | none | Yes | yes | 100% (5 checks) |
| Covalent | Multi-blockchain data aggregator platform | apikey | Yes | unknown | 100% (4 checks) |
| Dwellir | RPC endpoints for 150+ blockchain networks, including Ethereum, Solana, Polkadot and Hyperliquid | apikey | Yes | yes | 100% (5 checks) |
| Etherscan | Ethereum explorer API | apikey | Yes | yes | 100% (5 checks) |
| Get Started with Web3 | Bilingual Web3 lessons, glossary search and role-based learning paths | none | Yes | yes | 100% (5 checks) |
| GoldRush (formerly Covalent) | Multi-blockchain data aggregator platform | apikey | Yes | unknown | 80.0% (5 checks) |
| Helium | Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage | none | Yes | unknown | 100% (5 checks) |
| HEY Research Lab | Builder activity for Robinhood Chain tokens and projects: who is shipping, each ship with its source | none | Yes | yes | 100% (4 checks) |
| Layer4 | Layer4 is a blockchain integration platform that supports no-code and API use | apikey | Yes | yes | 100% (5 checks) |
| MELEK | Graphene social blockchain (Steem family) with a keyless condenser_api JSON-RPC | none | Yes | yes | 100% (5 checks) |
| Nownodes | Blockchain-as-a-service solution that provides high-quality connection via API | apikey | Yes | unknown | 100% (5 checks) |
| Steem | Blockchain-based blogging and social media website | none | No | no | 100% (5 checks) |
| The Graph | Indexing protocol for querying networks like Ethereum with GraphQL | apikey | Yes | unknown | 100% (5 checks) |
| Watchdata | Provide simple and reliable API access to Ethereum blockchain | apikey | Yes | unknown | 100% (5 checks) |
8 of these APIs require no authentication — you can start making requests immediately without signing up for an account. Just pick one from the table above, check its documentation, and send your first request.
12 APIs in this category require a free API key. This usually means creating a free account on the provider's website and copying your key from the dashboard. The process typically takes less than a minute.
Not sure where to start? Check the uptime column: it shows how often each API's documentation responded to our daily checks over the last 30 days, and the dot shows whether it responded at the latest check. For browser-based projects, check that the API supports CORS.
Yes, all APIs listed on API Bouncer have a free tier. Some are completely open (no sign-up needed), while others require a free account to get an API key. Free tiers typically have rate limits — check each API's documentation for specifics.
It depends on your needs. Consider: Do you need authentication or prefer no-auth? Does your project need CORS support for browser access? How many requests will you make? Start with a no-auth API to prototype quickly, then switch to a more feature-rich option if needed.
We run periodic health checks on all listed APIs. The "Status" column shows whether each API was responding at our last check. APIs marked as "alive" were recently verified. You can also test any API yourself using curl or our guides on testing APIs.
Most free APIs allow commercial use, but terms vary by provider. Always check the specific API's terms of service. Some APIs have separate free and commercial tiers with different rate limits.
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