> ## 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.

# estimate_x402_outbound_payment

> Validate an external x402 challenge and create a durable outbound intent.

**Mutates state:** Creates a durable outbound intent; moves no funds

```json theme={null}
{
  "x402_url": "https://example.com/paid-resource",
  "request": { "method": "GET" },
  "pay_with": {
    "asset": { "type": "fiat", "symbol": "USD" },
    "payment_instrument": "bank_transfer"
  }
}
```

The tool fetches the exact external request, validates a supported Worldchain
USDC requirement, and returns an intent ID, fiat funding amount, fees, pay-to
address, and confirmation deadline. Current public execution supports live
fiat on-ramp funding only.