402 Echo

Try the x402 protocol for free.
Your payment is instantly refunded.

Test your x402 client against:

Testnets

Base Sepolia

http://localhost:3000//api/base-sepolia/paid-content

Avalanche Fuji

http://localhost:3000//api/avalanche-fuji/paid-content

Polygon Amoy

http://localhost:3000//api/polygon-amoy/paid-content

Sei Testnet

http://localhost:3000//api/sei-testnet/paid-content

Mainnets

Base Mainnet

http://localhost:3000//api/base/paid-content

Polygon Mainnet

http://localhost:3000//api/polygon/paid-content

Peaq Mainnet

http://localhost:3000//api/peaq/paid-content

Sei Mainnet

http://localhost:3000//api/sei/paid-content

Quickstart Guides

Axios Quickstart

Attach the x402 interceptor to Axios and pay per request.

Fetch Quickstart

Wrap fetch with x402 to handle payments automatically.

Resources