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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 2026-10-10).
Converts a specified amount of currency using an AI-powered self-hosted gateway, requiring a micropayment (USDC on Base) via x402 protocol 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
Returns a JSON object containing the conversion result for the specified amount; exact response fields are not strictly defined but typically include the converted value or equivalent output.
Example use cases
Quick single-amount currency conversion
“Can you convert 100 of the source currency for me using the x402 AI gateway and tell me what comes back?”
Default unit conversion check
“What does the x402 AI gateway return when I convert the default amount of 1 unit of the source currency?”
Bulk amount currency estimation
“I need to convert 5000 units through the x402 AI gateway micropayment endpoint — can you run that and give me the result?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/mad?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, ultra-low-cost ($0.0002 USDC) currency conversion via an x402-compatible micropayment workflow, especially when integrating with agents that support the x402 payment protocol on Base and want to avoid subscription-based APIs.
Side effects
- Payment not included or insufficient USDC micropayment returns 402 Payment Required
- Invalid or missing 'amount' field returns validation error
- Upstream AI inference service unavailable returns 503 or 500
- Malformed request body returns 422 Unprocessable Entity
- Network timeout if self-hosted backend is under load
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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