shipx402.comLaunch app →
Ship x402
shipx402.com

Learn

Learn x402 interactively

Short, crawlable lessons. No account required. Jump to Learn x402 if you already have a wallet.

Featured

Learn x402

x402 makes HTTP 402 Payment Required useful: the server returns a machine-readable price; you (or an agent) pay; you retry with proof; the resource unlocks. Five steps.

Try lab in app
  1. 1

    You ask for a paid resource

    Your app (or an AI agent) does a normal HTTP request — same as loading any API.

    Why: No special payment channel. Money rides on the same web request/response loop the internet already uses.

  2. 2

    Server answers 402 Payment Required

    Instead of 200 OK or 401 Login, you get 402: 'Pay this amount, on this network, to this address, for this resource.'

    Why: HTTP already reserved 402 for payments. x402 finally defines the machine-readable details so software can pay without humans filling forms.

  3. 3

    Client builds a payment

    Your wallet signs a payment that matches the requirements — amount, destination, resource.

    Why: Only the key holder can authorize spend. Signing proves intent without handing the server your private key.

  4. 4

    Retry the same request with proof

    You call the same URL again, this time attaching the payment proof in a header.

    Why: One protocol for humans, bots, and agents: request → price → pay → unlock. No account signup required.

  5. 5

    Server verifies / settles, then delivers

    The server checks the proof (itself or via a facilitator), settles on-chain if needed, and returns 200 + the goods.

    Why: Sellers get paid per call. Buyers only pay when they need the resource. Micropayments become practical on fast, cheap chains like Solana.

x402 vs MPPShip an API on SolanaLive lab endpoint →

Solana wallets in plain English

A wallet is a key pair, not an app-store install. Public address = share to receive. Private key = never share; it is spending power. Ship x402 creates keys only in your browser.

How the wallet works

Devnet vs mainnet

  • Learn / Devnet — free practice SOL, airdrops, break things safely.
  • Real / Mainnet — real value. Small amounts in-browser; hardware wallet for savings.

Solana Pay turns your address into a QR / solana: link phones can scan.

What to do next

  1. Open the wallet app and create a Devnet wallet (write down keys).
  2. Run the x402 Lab tab — same five steps as above.
  3. If you build agents, read the agent classroom and curriculum JSON.
Open appAgents