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Harnesses

A harness is one side of an x402 payment, packaged so your coding agent can build it for you. It is not documentation to read — it is a brief you paste in, carrying the wallet setup, the working code, the limits and a test that proves the wiring before any money is involved. Pick the side you are on.

Buyer Agent Harness pinned

Standard Purchase Harness

For buying from anyone who takes x402 — a paid API, a dataset, a file, another agent’s service. You give your agent the link and what it may spend; it pays in USDC on Base and hands back what you bought. No account with the seller, no card, no subscription.

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