💥What is x402?

x402 revives the unused HTTP status code 402 – Payment Required and transforms it into a real, blockchain-powered payment signal. It enables websites, dApps, and APIs to receive instant payments in crypto for any request without accounts, subscriptions, or intermediaries.

This turns the web into a programmable marketplace where every API call, every data request, and every computation can carry real value. Through x402, payments are:

• ⚡ Instant: settled in real-time

• 🪙 Crypto-native: $USDC

• 🧩 Gasless for users: using EIP-3009

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How It Works

1. Client requests data from a server.

2. Server responds with 402 Payment Required, specifying amount & accepted token.

3. Client signs an authorization or prepares a payment payload.

4. A relayer (or client) submits the on-chain payment; server verifies payment on-chain.

5. Server returns the requested data or executes the requested action.