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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 by 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 result of the currency conversion computation. The exact fields returned are not fully documented (response schema is a generic object), but expected to include the converted amount or equivalent value for the input amount provided.
Example use cases
Real-time currency conversion for checkout
“I need to convert 500 units of currency for a checkout flow — use the x402 gateway and authorize the $0.0002 USDC micropayment to get the result.”
On-chain pay-per-call data enrichment
“Run a currency amount conversion for 1000 units through the x402 micropayment gateway and give me the output — pay the Base USDC fee automatically.”
Testing x402 micropayment-gated endpoint
“I want to test the x402 AI gateway by converting a default amount of 1 — go ahead and pay the required USDC micropayment on Base and show me what comes back.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/ghs?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, micropayment-gated currency amount conversion that settles on-chain via USDC on Base. It is especially suitable for AI agents that natively support x402 payment flows and need lightweight, serverless-style computation without API key management. Prefer alternatives for high-volume batch conversions or when on-chain payment overhead is undesirable.
Side effects
- Payment not provided or rejected — 402 Payment Required response blocking execution
- Invalid or missing amount field — may default to 1 or return a validation error
- Upstream gateway unavailable — 502/503 if self-hosted inference server is down
- Malformed request body — 422 Unprocessable Entity if schema is violated
- Insufficient USDC balance on Base for micropayment — payment gateway rejects the transaction
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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