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How Do AI Agents Pay For Apis With Crypto

AI agents pay APIs in crypto through x402, an HTTP 402 flow where the agent pays USDC and retries the request.

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The x402 flow in four steps

  1. The client requests a protected resource.
  2. The server returns payment instructions instead of the resource.
  3. The wallet reviews and authorizes the payment.
  4. The client retries the request and inspects the response.

The payment response and the returned work should be checked separately.

What the agent needs

The client needs to understand the payment challenge, use a wallet and network it supports, and resume the same request after payment. A service can still refuse or fail the underlying call, so inspect its response separately.

Check the current client and server documentation before enabling unattended payment.

A live example with Zambo

Zambo is the tool and record layer beside the payment request. It can return a receipt for the work call so the caller can share and inspect what the tool returned.

Use the connection guide to add the MCP server; review Day Pass details before any purchase.

Try this prompt

Start with a small request. Change the details to match your task.

Use Zambo to explain the payment step before it happens, then show the receipt for the completed request.

Live example

This is a public record from the production site. Review the record itself; it does not establish that the work was correct.

Open a live receipt example

Related guides

FAQ

What is how do ai agents pay for apis with crypto?

AI agents pay APIs in crypto through x402, an HTTP 402 flow where the agent pays USDC and retries the request.

What does a Zambo receipt show?

It shows the saved record and its available status. It does not prove that the output is correct or complete.

How do I try this with Zambo?

Check the payment request in your wallet, approve only a request you intend to pay, then review the resulting receipt.

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