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x402 AI Gateway – Currency Amount Converter
x402
x402 AI Gateway – Currency Amount Converter 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, gated behind an x402 USDC micropayment on Base before execution.
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 result. The exact fields depend on the gateway's internal logic, but the agent receives the computed conversion output for the given input amount.
Example use cases
Real-time travel budget conversion
“I need to convert 500 USD worth of value — can you use the x402 currency converter to tell me how much that is in the destination currency?”
E-commerce multi-currency pricing
“Convert 1 unit of our base currency using the x402 gateway so I can display the correct price for international customers.”
Automated invoice reconciliation
“Run a currency conversion for 1200 on the x402-gated converter so I can reconcile this invoice amount against our local books.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/mop?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, self-hosted currency conversion that integrates natively with the x402 micropayment protocol (USDC on Base). Prefer it in agentic workflows where cost-per-call accountability matters and you want on-chain payment provenance. Not ideal if you need a free or high-volume batch conversion, or if you require guaranteed SLA from a centralized provider.
Side effects
- Payment not fulfilled — x402 micropayment (USDC on Base) not provided or rejected, resulting in a 402 Payment Required response
- Invalid or missing amount field — defaults to 1 if omitted, but malformed input may return an error
- Gateway unavailable — self-hosted infrastructure may be offline or rate-limited
- Unrecognized currency pair — if the endpoint does not support the requested source/target currency combination
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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