tempo-x402-demo

Interactive demo of the tempo-x402 payment protocol.

Demonstrates the HTTP 402 Payment Required flow on the Tempo blockchain:

1. Request a protected endpoint
2. Receive 402 response with payment requirements
3. Sign an EIP-712 payment authorization
4. Retry with PAYMENT-SIGNATURE header
5. Receive the paid response + settlement transaction

Quick start

npm install
npm run dev

Open http://localhost:3000

How it works

• Demo Key mode (default): Uses a pre-funded testnet wallet. No setup required.
• Browser Wallet mode: Connect MetaMask or any EIP-1193 wallet. Must have pathUSD on Tempo Moderato and have approved the facilitator.

Stack

• Next.js 16
• viem for EIP-712 signing
• Tailwind CSS
• Points at deployed Railway services

Links

• tempo-x402 crate
• GitHub
• Tempo Moderato Explorer

Chain

• Network: Tempo Moderato (testnet)
• Chain ID: 42431
• Token: pathUSD (6 decimals)
• RPC: https://rpc.moderato.tempo.xyz