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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 before executing.
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; exact output fields depend on the gateway's current implementation but typically include the converted value or exchange details.
Example use cases
Real-time currency conversion for checkout
“Convert 100 units of currency using the x402 gateway so I can display the converted amount at checkout.”
Budget calculation in foreign currency
“I need to convert 250 of a source currency — use the micropayment-gated converter and give me the result.”
Single-unit exchange rate lookup
“What does 1 unit of the source currency convert to? Use the x402 AI gateway converter and pay the micropayment.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/mru?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a low-cost ($0.0002 USDC), pay-per-call currency conversion without committing to a subscription, and your agent already supports the x402 micropayment protocol on Base. Best for lightweight, infrequent conversions where a dedicated FX API subscription is overkill.
Side effects
- Payment not provided or rejected — 402 Payment Required returned before execution
- Invalid or missing amount field — 422 Unprocessable Entity
- Upstream currency data unavailable — 503 or empty result
- Malformed request body — 400 Bad Request
- Micropayment insufficient — gateway rejects and returns 402
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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