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x402 AI Gateway – Currency Conversion Endpoint
x402
x402 AI Gateway – Currency Conversion Endpoint is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0002/call, status unknown (last checked 2026-10-13).
Converts a specified amount from one currency to another, 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
A JSON object containing the converted currency value for the specified amount, likely including the resulting amount and possibly the exchange rate applied. The exact schema is unspecified beyond a generic object response.
Example use cases
Traveler currency budget check
“I'm heading to Japan and want to know how much 500 USD converts to in Japanese yen right now — can you run it through the pay-per-call currency conversion API?”
E-commerce multi-currency pricing
“I need to display product prices in euros for my European customers — convert 79.99 USD to EUR using the x402 currency converter.”
Crypto-to-fiat spot check
“What's 1 ETH worth in British pounds today? Use the micropayment currency conversion endpoint and just charge the USDC fee.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/try?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-use, self-hosted currency conversion with x402 micropayment support on Base (USDC), especially in agent workflows where you want to avoid subscription-based FX APIs and prefer fractional per-call billing at $0.0002 per request. It is well-suited for low-frequency, on-demand currency lookups embedded in autonomous agent pipelines.
Side effects
- Payment not provided or insufficient USDC — returns HTTP 402 Payment Required
- Invalid or unsupported currency codes — may return an error or empty result
- Amount parameter missing — defaults to 1 or may error
- Network/gateway unavailability — connection timeout or 5xx error
- Stale or unavailable exchange rate data — may return outdated or null values
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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