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x402 AI Gateway – Currency Amount Conversion
x402
x402 AI Gateway – Currency Amount Conversion 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 micropayment in USDC on Base before execution.
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 result of the currency conversion for the specified amount; exact fields depend on the server implementation but typically include the converted value or exchange result.
Example use cases
Travel budget currency check
“How much is 500 in the source currency worth after conversion? Use the x402 gateway and pay the micropayment automatically.”
E-commerce price normalization
“I need to convert 1000 units through the x402 AI gateway — can you run the conversion and give me the result?”
Single-unit exchange rate lookup
“What does converting just 1 unit give me through the x402 micropayment-gated currency endpoint?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/mnt?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, micropayment-gated currency conversion call on a self-hosted infrastructure and are already set up to handle x402 USDC payments on Base. Useful for agents that need cost-controlled, per-call currency lookups without committing to a subscription API.
Side effects
- Payment not provided or rejected — 402 Payment Required returned before execution
- Invalid or missing amount field — server may return 400 or default to 1
- Service unavailable on self-hosted infrastructure — 503 or timeout
- Unsupported currency pair — may return empty or error object
- Malformed request body — 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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