Free Blockchain APIs with no API key

8 Blockchain APIs that need no API key, account or credit card. 3 of them also allow CORS, so you can call them straight from browser JavaScript. Listed by uptime and ease of use.

1. 1

   Get Started with Web3 API

   Online · 507 ms

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

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
2. 2

   TWZRD Agent Intel API

   Online · 1223 ms

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

   • No API key needed
   • Returns JSON at its URL
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
3. 3

   ClearTrace API

   Online · 940 ms

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

   • No API key needed
   • Callable from the browser (CORS)
   • HTTPS

   No authHTTPSCORS
4. 4

   Chainpoint API

   Online · 1050 ms

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

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
5. 5

   Chainlink API

   Online · 4717 ms

   Build hybrid smart contracts with Chainlink.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
6. 6

   Helium API

   Online · 1953 ms

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

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
7. 7

   Steem API

   Online · 630 ms

   Blockchain-based blogging and social media website.

   • No API key needed

   No authNo HTTPSNo CORS
8. 8W

   Walltime API

   Last check failed

   To retrieve Walltime's market info.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?

Keyless Blockchain APIs compared

Blockchain APIs with no API key

API	API key	HTTPS	CORS	Uptime	Response	Rating
Get Started with Web3	No	Yes	Yes	Up	507 ms	Not rated
TWZRD Agent Intel	No	Yes	Yes	Up	1223 ms	Not rated
ClearTrace	No	Yes	Yes	Up	940 ms	Not rated
Chainpoint	No	Yes	Unknown	Up	1050 ms	Not rated
Chainlink	No	Yes	Unknown	Up	4717 ms	Not rated
Helium	No	Yes	Unknown	Up	1953 ms	Not rated
Steem	No	No	No	Up	630 ms	Not rated
WWalltime	No	Yes	Unknown	Down	–	Not rated

See also: best Blockchain APIs · all 17 Blockchain APIs · every API with no key