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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.
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, including the converted amount or equivalent value for the input currency quantity provided.
Example use cases
Quick FX amount calculation
“Can you convert 500 of the source currency for me using the fx gateway? I need the converted amount right away.”
Micropayment-gated FX for agent workflow
“I'm building an automated workflow that needs currency conversion — use the x402 micropayment gateway to convert 1000 units and give me the result.”
Single unit exchange rate lookup
“What does 1 unit of the source currency convert to? Use the fx endpoint on the fastapi.online gateway to get the answer.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/omr?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a low-cost, per-call currency amount conversion accessible via the x402 micropayment protocol (USDC on Base), particularly in autonomous agent pipelines that already handle x402 payment flows. Prefer this over public free FX APIs when your stack is already integrated with the x402 payment rail and you want a unified self-hosted gateway experience.
Side effects
- 402 Payment Required — x402 micropayment not attached or insufficient USDC balance on Base
- Invalid or missing 'amount' field — must be a numeric value
- Unsupported currency pair — source or target currency not recognized
- Network or gateway timeout from the self-hosted inference server
- Empty or malformed response object if upstream FX data is unavailable
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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