402 Echo

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

Ready to get started?
Test your x402 client against:
Testnets
Solana Devnet
/api/solana-devnet/paid-content
Base Sepolia
/api/base-sepolia/paid-content
Avalanche Fuji
/api/avalanche-fuji/paid-content
Polygon Amoy
/api/polygon-amoy/paid-content
Sei Testnet
/api/sei-testnet/paid-content
Mainnets
Solana Mainnet
/api/solana/paid-content
Base Mainnet
/api/base/paid-content
Polygon Mainnet
/api/polygon/paid-content
Peaq Mainnet
/api/peaq/paid-content
Sei Mainnet
/api/sei/paid-content

Quickstart Guides

Next.js Quickstart

Build a paywall-protected Next.js app with x402.

Read the guide
Express Quickstart

Add x402 middleware to your Express server in minutes.

Read the guide
Hono Quickstart

Integrate x402 payments into your Hono API with ease.

Read the guide
PayAI Facilitator

Explore the PayAI Facilitator service powering x402 payments.

Visit Facilitator

Resources