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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 2026-10-11).
Converts a specified amount of a source currency via a self-hosted AI gateway endpoint protected by x402 USDC micropayment.
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 conversion computation. The exact fields are not documented in the schema beyond a generic object, so the agent should inspect the response body for the converted value and any metadata returned by the gateway.
Example use cases
Automated currency conversion in agent workflow
“I need to convert 100 units of my source currency right now — use the x402 gateway and pay the micropayment automatically so I get the converted amount back.”
Testing x402 micropayment-gated API
“Can you hit the x402 AI gateway currency conversion endpoint with an amount of 1 and confirm the USDC micropayment on Base goes through and returns a result?”
Bulk micro-conversion for accounting pipeline
“Run a currency conversion for amount 500 through the fastapi.online x402 gateway — I want to see what value comes back after the micropayment clears.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/pab?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call currency conversion that settles instantly via USDC micropayment on Base, especially in autonomous agent workflows where on-chain payment authorization is already set up. Prefer it over free or subscription-based APIs when you want minimal commitment and true usage-based billing at $0.0002 per call. Avoid if you need a well-documented schema, guaranteed uptime SLA, or do not have a USDC wallet configured on Base.
Side effects
- Payment not authorized or insufficient USDC balance on Base — returns HTTP 402 Payment Required
- Invalid or missing 'amount' field — may return a 4xx validation error
- Gateway server unavailable or self-hosted instance down — returns 5xx or connection timeout
- x402 facilitator unable to verify payment — transaction rejected before processing
- Amount value out of supported range — unspecified error 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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