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402 Echo

Try the x402 protocol for free.

Your payment is instantly refunded.

Connect your Phantom wallet to try the payment demo

Demo Video

Testnets

Test your x402 client against:

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

Production Networks

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

Get Started in Minutes

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Axios Quickstart

Attach the x402 interceptor to Axios and pay per request.

Read the guide
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Fetch Quickstart

Wrap fetch with x402 to handle payments automatically.

Read the guide