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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 micropayment in USDC 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 result of the currency conversion for the specified amount. The exact fields depend on the gateway's response but typically include the converted value and possibly metadata about the conversion.
Example use cases
Single unit currency baseline check
“Convert 1 unit of currency through the x402 gateway and tell me the result — go ahead and authorize the $0.0002 USDC micropayment on Base.”
Bulk amount conversion estimate
“I need to convert 500 units of my source currency through the x402-gated endpoint on fastapi.online — approve the micropayment and return the converted value.”
Automated agent FX pricing check
“My agent needs to check the converted value for 250 units using the x402 micropayment API, paying $0.0002 USDC on Base per call — run it now.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/xcg?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call currency conversion gated by x402 micropayments in USDC on Base, particularly in agentic workflows where autonomous micropayment authorization is supported and cost-per-call pricing is acceptable.
Side effects
- Payment not authorized or insufficient USDC balance — 402 Payment Required returned
- Invalid or missing 'amount' field — validation error
- Gateway service unavailable — 503 or timeout
- Malformed request body — 400 Bad Request
- Amount out of acceptable range — error response
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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