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x402 AI Gateway – Currency Conversion Endpoint
x402
x402 AI Gateway – Currency 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 2026-10-10).
Converts a specified amount of a source currency via a self-hosted AI gateway that requires a micropayment (USDC on Base) before executing.
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 converted currency amount or exchange result for the given input amount and currency pair.
Example use cases
Quick cross-currency amount check
“How much is 500 Japanese Yen worth in US dollars right now? Use the x402 gateway and pay the fee automatically.”
E-commerce order total conversion
“I need to convert 1200 GBP to EUR for an invoice — run it through the x402 currency converter and give me the converted amount.”
Crypto-to-fiat estimate
“What would 2.5 ETH be worth in USD? Use the micropayment-gated converter and return the result.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/gel?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, self-hosted currency conversion that is gated by a tiny USDC micropayment on Base, particularly in agent workflows where x402 payment flows are already established and you want to avoid centralized API key management.
Side effects
- Payment not made or insufficient USDC balance — 402 Payment Required response
- Invalid or missing amount field — validation error
- Unsupported currency pair — error or empty result
- Gateway downtime or self-hosted service unavailable — 5xx error
- Network timeout if Base blockchain payment confirmation is slow
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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