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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 2026-10-12).
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
Returns a JSON object containing the conversion result for the given amount; exact output fields depend on the gateway's underlying computation, but the response reflects the converted value after the x402 micropayment is processed.
Example use cases
Quick foreign exchange amount check
“I need to convert 500 units of currency using that micropayment-gated conversion API — go ahead and pay the tiny USDC fee and give me the result.”
Automated FX calculation in agent workflow
“As part of my expense reporting workflow, convert the amount 1200 using the x402 gateway and return the converted value so I can log it.”
On-demand single-unit conversion rate lookup
“What does 1 unit convert to? Use the x402 currency conversion endpoint and pay the $0.0002 USDC fee automatically.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/kpw?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call currency amount conversion that is gated by an x402 USDC micropayment on Base, making it suitable for autonomous AI agents that can handle blockchain-based micropayments natively without subscription management.
Side effects
- 402 Payment Required if the x402 micropayment has not been provided or is invalid
- Malformed request if 'amount' is not a valid number
- Timeout or 5xx error if the self-hosted gateway is unavailable
- Insufficient USDC balance on Base for the micropayment
- Gateway returns empty or null result if conversion data is unavailable
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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