Watchdata API alternatives

Provide simple and reliable API access to Ethereum blockchain. If it doesn't fit your project, here are the 10 best free Blockchain APIs to use instead in 2026, out of 16 in the directory.

For reference, Watchdata API: HTTPS.

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

   Dwellir API

   Online · 1042 ms

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

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
5. 5

   Chainpoint API

   Online · 1050 ms

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

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
6. 6

   Chainlink API

   Online · 4717 ms

   Build hybrid smart contracts with Chainlink.

   • No API key needed
   • HTTPS

   No authHTTPSCORS ?
7. 7

   Etherscan API

   Online · 1568 ms

   Etherscan APIs derives data from Etherscan’s Ethereum (ETH) Block Explorer to cater for Ethereum applications through API Endpoints & API Pro Endpoints.

   • Callable from the browser (CORS)
   • HTTPS

   apiKeyHTTPSCORS
8. 8

   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 ?
9. 9

   Nownodes API

   Online · 879 ms

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

   • HTTPS

   apiKeyHTTPSCORS ?
10. 10

    SwiftNodes API

    Online · 1700 ms

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

    • Callable from the browser (CORS)
    • HTTPS

    apiKeyHTTPSCORS

Watchdata API vs alternatives

Watchdata API compared with its alternatives

API	API key	HTTPS	CORS	Uptime	Response	Rating
Watchdata	Required	Yes	Unknown	Up	569 ms	Not rated
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
Dwellir	Required	Yes	Yes	Up	1042 ms	Not rated
Chainpoint	No	Yes	Unknown	Up	1050 ms	Not rated
Chainlink	No	Yes	Unknown	Up	4717 ms	Not rated
Etherscan	Required	Yes	Yes	Up	1568 ms	Not rated
Helium	No	Yes	Unknown	Up	1953 ms	Not rated

See also: best Blockchain APIs · all Blockchain APIs