402 Echo

Try the x402 protocol for free.

Your payment is instantly refunded.

Test your x402 client against:

Testnets

Base Sepolia
https://x402.a2a-x402.network/api/base-sepolia/paid-content
Avalanche Fuji
https://x402.a2a-x402.network/api/avalanche-fuji/paid-content
Polygon Amoy
https://x402.a2a-x402.network/api/polygon-amoy/paid-content
Sei Testnet
https://x402.a2a-x402.network/api/sei-testnet/paid-content

Mainnets

Base Mainnet
https://x402.a2a-x402.network/api/base/paid-content
Polygon Mainnet
https://x402.a2a-x402.network/api/polygon/paid-content
Peaq Mainnet
https://x402.a2a-x402.network/api/peaq/paid-content
Sei Mainnet
https://x402.a2a-x402.network/api/sei/paid-content

Quickstart Guides

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Axios Quickstart

Attach the x402 interceptor to Axios and pay per request.

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Fetch Quickstart

Wrap fetch with x402 to handle payments automatically.