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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 2026-10-10).
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 result of the currency amount conversion; the exact fields depend on the gateway implementation but typically include the converted value and possibly metadata about the conversion.
Example use cases
Travel budget currency conversion
“I'm heading to Japan and want to know how much 500 USD converts to — can you run that through the x402 micropayment currency converter and give me the result?”
E-commerce multi-currency pricing
“For my online store, convert 1 unit of GBP so I can display the equivalent price in my base currency — use the x402-gated converter endpoint.”
Crypto-adjacent fiat amount check
“I need to know what 75 EUR is worth right now — please use the x402 currency conversion gateway and tell me the converted amount.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/kgs?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, self-hosted, pay-per-call currency conversion that operates within the x402 micropayment protocol on Base (USDC). It is ideal for agents that already have x402 payment capability and want to avoid subscription-based FX APIs. At $0.0002 per call it is extremely cheap for low-volume or on-demand conversion needs.
Side effects
- 402 Payment Required if the USDC micropayment on Base is not provided or fails
- Invalid or missing amount field results in a validation error
- Unsupported currency pair may return an error or empty result
- Network timeout or gateway unavailability
- Malformed request body causing a 422 Unprocessable Entity response
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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