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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 2026-10-11).
Converts a specified amount of a source currency, returning the converted value, via a micropayment-gated AI inference endpoint.
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 conversion result for the specified amount of the source currency. The exact fields depend on the endpoint's implementation, but typically include the converted value and possibly the exchange rate or currency pair details.
Example use cases
Quick currency amount conversion
“Can you convert 250 units of currency through the x402 gateway and tell me what the converted amount comes out to?”
Default single-unit conversion check
“What does 1 unit of the source currency convert to? Use the fastapi.online x402 gateway to get the result.”
Batch conversion estimate for invoicing
“I need to convert 5000 units via the micropayment-gated currency endpoint on fastapi.online — what's the converted value so I can use it in my invoice?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/ttd?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a micropayment-gated currency conversion computation hosted on a self-hosted AI inference gateway (fastapi.online), especially in workflows already using the x402 payment protocol on Base/USDC. It is best suited for agents that manage x402 payments natively and need a low-cost ($0.0002 USDC) per-call conversion without relying on traditional API-key-gated FX services.
Side effects
- Payment not provided or invalid x402 micropayment — returns HTTP 402 Payment Required
- Amount field missing or non-numeric — returns validation error
- Source or target currency not supported — may return empty or error object
- Downstream AI inference service unavailable — returns 5xx error
- Malformed request body — returns 422 Unprocessable Entity
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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