Category
Blockchain APIs
17 APIs, 8 of them with no auth listed. Each one links to its own page with auth, HTTPS, CORS and the official docs.
APIs17
No auth listed47%8 of 17
HTTPS94%
CORS enabled41%
Docs link reachable94%at the last weekly check
Quick starts
No key, HTTPS and CORS, and the docs link answered at the last check: call these from a web page in minutes.
ClearTraceCross-frontend DEX attribution and execution quality data across Ethereum and L2s
Get Started with Web3Bilingual Web3 lessons, glossary search and role-based learning paths- TWZRD Agent IntelSolana on-chain agent trust scoring via MCP; 4 free tools to score, resolve and verify AI agent wallets
All Blockchain APIs
BitqueryOnchain GraphQL APIs & DEX APIsapiKeyCORS
BlockscoutMultichain block explorer REST API (with Etherscan-compatible JSON-RPC)apiKey
ChainlinkBuild hybrid smart contracts with ChainlinkNo auth
ChainpointChainpoint is a global network for anchoring data to the Bitcoin blockchainNo auth- ClearTraceCross-frontend DEX attribution and execution quality data across Ethereum and L2sNo authCORS
CovalentMulti-blockchain data aggregator platformapiKey
DwellirRPC endpoints for 150+ blockchain networks, including Ethereum, Solana, Polkadot and HyperliquidapiKeyCORS
EtherscanEthereum explorer APIapiKeyCORS- Get Started with Web3Bilingual Web3 lessons, glossary search and role-based learning pathsNo authCORS
HeliumHelium is a global, distributed network of Hotspots that create public, long-range wireless coverageNo auth
NownodesBlockchain-as-a-service solution that provides high-quality connection via APIapiKey
SteemBlockchain-based blogging and social media websiteNo auth
SwiftNodesMulti-chain blockchain RPC nodes (Ethereum, Solana and 75+ networks)apiKeyCORS
The GraphIndexing protocol for querying networks like Ethereum with GraphQLapiKey- TWZRD Agent IntelSolana on-chain agent trust scoring via MCP; 4 free tools to score, resolve and verify AI agent walletsNo authCORS
- WalltimeTo retrieve Walltime's market infoNo authLink down
- WatchdataProvide simple and reliable API access to Ethereum blockchainapiKey