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x402 AI Gateway – Currency Conversion (XDR)
x402
x402 AI Gateway – Currency Conversion (XDR) 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 using a micropayment-gated AI gateway endpoint, returning conversion results after a USDC x402 payment.
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 currency amount; exact fields depend on the server implementation but typically include the converted value and possibly the exchange rate used.
Example use cases
Real-time XDR currency conversion
“What is 100 XDR worth right now? Use the micropayment-gated conversion endpoint and pay the small USDC fee.”
Travel budget currency check
“I'm budgeting for a trip — can you convert 500 units of XDR for me and tell me the result? It's fine to pay the tiny x402 micropayment.”
Automated FX rate lookup for invoicing
“I need to convert 1 XDR as a reference rate for an invoice I'm preparing — please use the x402 gateway and authorize the micropayment.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/xdr?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, self-hosted currency conversion with x402 micropayment support on Base (USDC), especially if you want to avoid subscription-based FX APIs and only pay $0.0002 per query. Prefer alternatives if you need free, high-volume, or multi-currency batch conversions.
Side effects
- Payment not authorized or insufficient USDC balance — 402 Payment Required returned
- Invalid or missing amount parameter — validation error
- Upstream currency data unavailable — 500 or timeout
- Unsupported currency pair — empty or error response
- x402 facilitator unreachable — payment flow fails before execution
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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