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x402 AI Gateway – Currency Amount Conversion
x402
x402 AI Gateway – Currency Amount Conversion 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, returning the converted value, gated behind an x402 USDC micropayment.
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
A JSON object containing the conversion result for the specified amount; the exact fields depend on the gateway's underlying currency conversion logic, but typically includes the converted value or equivalent amount.
Example use cases
Quick currency amount conversion
“I need to convert 500 of the source currency — go ahead and make the x402 micropayment and give me the result.”
Automated per-call FX lookup in workflow
“In my agent workflow, after each transaction I want to convert 1 unit of the source currency to get the baseline rate — handle the USDC micropayment automatically each time.”
Spot-check conversion for budgeting
“Convert 1000 units of the source currency for me and tell me what comes back, the micropayment cost is fine.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/gnf?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call currency amount conversion that requires no subscription or API key — only a small USDC micropayment on Base via the x402 protocol. It is best suited for agent workflows that need sporadic, low-cost currency conversions without committing to a monthly plan.
Side effects
- Payment not provided or insufficient USDC balance — 402 Payment Required returned before execution
- Invalid or missing 'amount' field — 422 Unprocessable Entity or validation error
- Gateway unreachable or self-hosted service down — 502/503 error
- Amount is zero or negative — may return error or undefined result
- Unsupported currency pair — empty or error response from underlying logic
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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