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x402 AI Gateway – Currency Amount Conversion Endpoint
x402
x402 AI Gateway – Currency Amount Conversion Endpoint is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0002/call, status unknown (last checked 2026-10-12).
Converts a specified amount of a source currency via a self-hosted AI gateway, gated by an x402 USDC micropayment on Base.
Price / call$0.0002
Success—
StatusUnknown
How this service works
Self-hosted AI API gateway. Expensive endpoints require an x402 micropayment (USDC on Base) before executing.
Output
Returns a JSON object containing the result of the currency conversion computation. The exact fields depend on the endpoint's internal logic, but typically includes the converted amount or related financial data.
Example use cases
On-chain micropayment currency conversion
“I need to convert 500 of my source currency and I'm okay paying a small USDC fee per call on Base — use the x402 gateway to do it.”
Automated currency amount normalization
“For my app's pricing pipeline, convert 1 unit of the source currency through the x402 AI gateway so I can normalize costs across markets.”
Testing x402 payment-gated API flow
“Run a test conversion of 10 units through the x402 micropayment AI gateway and show me what comes back so I can verify the payment flow works.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/npr?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, micropayment-gated currency conversion that integrates with the x402/USDC payment rail on Base, particularly in autonomous agent workflows where on-chain payments are preferred over subscription APIs.
Side effects
- 402 Payment Required if USDC micropayment on Base is not provided or insufficient
- Invalid input if amount is not a valid number
- Timeout or 5xx if the self-hosted inference backend is unavailable
- Malformed response if the upstream AI gateway encounters an internal error
- Rejected payment if the x402 facilitator cannot verify the transaction
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| amount | number | Amount of the source currency to convert (default 1) |
Output
Schema · Response
{
"type": "object"
}Tags
x402
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