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Public APIs

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Public APIs · by APILayerData from public-apis (MIT)
  1. Home
  2. /Categories
  3. /Blockchain

Free Blockchain APIs

17 free public Blockchain APIs for developers. 16 support HTTPS, 7 allow CORS from the browser and 8 need no API key.

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Showing 17 of 17 APIs

Bitquery logo

Bitquery

Onchain GraphQL APIs & DEX APIs

apiKeyHTTPSCORS
Blockscout logo

Blockscout

Multichain block explorer REST API (with Etherscan-compatible JSON-RPC)

apiKeyHTTPSNo CORS
Chainlink logo

Chainlink

Build hybrid smart contracts with Chainlink

No authHTTPSCORS ?
Chainpoint logo

Chainpoint

Chainpoint is a global network for anchoring data to the Bitcoin blockchain

No authHTTPSCORS ?
ClearTrace logo

ClearTrace

Cross-frontend DEX attribution and execution quality data across Ethereum and L2s

No authHTTPSCORS
Covalent logo

Covalent

Multi-blockchain data aggregator platform

apiKeyHTTPSCORS ?
Dwellir logo

Dwellir

RPC endpoints for 150+ blockchain networks, including Ethereum, Solana, Polkadot and Hyperliquid

apiKeyHTTPSCORS
Etherscan logo

Etherscan

Ethereum explorer API

apiKeyHTTPSCORS
Get Started with Web3 logo

Get Started with Web3

Bilingual Web3 lessons, glossary search and role-based learning paths

No authHTTPSCORS
Helium logo

Helium

Helium is a global, distributed network of Hotspots that create public, long-range wireless coverage

No authHTTPSCORS ?
Nownodes logo

Nownodes

Blockchain-as-a-service solution that provides high-quality connection via API

apiKeyHTTPSCORS ?
Steem logo

Steem

Blockchain-based blogging and social media website

No authNo HTTPSNo CORS
SwiftNodes logo

SwiftNodes

Multi-chain blockchain RPC nodes (Ethereum, Solana and 75+ networks)

apiKeyHTTPSCORS
The Graph logo

The Graph

Indexing protocol for querying networks like Ethereum with GraphQL

apiKeyHTTPSCORS ?
TWZRD Agent Intel logo

TWZRD Agent Intel

Solana on-chain agent trust scoring via MCP; 4 free tools to score, resolve and verify AI agent wallets

No authHTTPSCORS
W

Walltime

To retrieve Walltime's market info

No authHTTPSCORS ?
Watchdata logo

Watchdata

Provide simple and reliable API access to Ethereum blockchain

apiKeyHTTPSCORS ?

Blockchain API FAQ

How many free Blockchain APIs are there?

There are 17 free public Blockchain APIs in the directory. 16 support HTTPS, 7 are confirmed to allow CORS and 8 need no API key.

Which Blockchain APIs work without an API key?

8 Blockchain APIs need no authentication, including Chainlink, Chainpoint, ClearTrace and Get Started with Web3. You can call them straight away without signing up.

Which Blockchain APIs can I call from the browser?

APIs with CORS enabled can be called directly from front-end JavaScript. In Blockchain, that includes Bitquery, ClearTrace, Dwellir and Etherscan.