> ## Documentation Index
> Fetch the complete documentation index at: https://docs.useagentbank.com/llms.txt
> Use this file to discover all available pages before exploring further.

# x402 outbound payments

> Pay an external x402 resource through a supported live fiat on-ramp.

Use the dedicated x402 tools only when a requested external URL returns an
x402 payment challenge.

<Steps>
  <Step title="Estimate the external request">
    Call `estimate_x402_outbound_payment` with the exact URL, HTTP method,
    optional request body, and requested fiat funding asset. The tool validates
    the challenge and creates a durable outbound intent without moving funds.
  </Step>

  <Step title="Review and confirm">
    Show the external USDC requirement, exact fiat amount, fees, pay-to
    address, and `confirm_before`. Obtain explicit confirmation.
  </Step>

  <Step title="Start fiat funding">
    Call `confirm_x402_outbound_payment` with the returned intent ID and
    `confirmed_by_user=true`. Follow the server-generated on-ramp instruction.
  </Step>

  <Step title="Track the durable intent">
    Poll `get_x402_outbound_payment` until terminal. Use
    `list_x402_outbound_payments` to recover an existing intent when its ID is
    unknown.
  </Step>
</Steps>

Outbound x402 currently supports live fiat on-ramps only. Do not construct an
x402 header, EIP-3009 authorization, transaction, or signature locally. A USDC
transaction hash alone does not prove that the external resource accepted the
payment; require the durable intent to report `completed` and
`successful=true`.