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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 2026-10-09).
Converts a specified amount of a source currency via a self-hosted AI gateway endpoint secured with x402 USDC micropayments on Base.
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 currency conversion result for the specified amount; exact fields depend on the server implementation but typically includes the converted value.
Example use cases
Quick currency amount lookup
“I need to convert 500 of my source currency — can you hit the x402 gateway, pay the micropayment, and tell me the converted amount?”
Automated FX check in a workflow
“As part of my expense reconciliation, convert 1 unit using the x402-gated API and return the conversion result so I can use it downstream.”
Microtransaction-gated rate fetch
“Use the x402 AI gateway to convert 1000 units and return whatever the conversion result is — go ahead and authorize the USDC micropayment.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/mga?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need currency conversion in an agent workflow that already supports x402 micropayment flows on Base/USDC, and when cost per call ($0.0002 USDC) is acceptable. Prefer this over free alternatives when operating in a trustless, pay-per-use agent economy or when the self-hosted nature of the gateway provides privacy or control benefits.
Side effects
- 402 Payment Required if USDC micropayment fails or wallet balance is insufficient
- Invalid amount input returns a validation error
- Upstream currency data unavailable returns a 503 or empty result
- Malformed request body returns a 422 Unprocessable Entity
- Network timeout if the self-hosted gateway is overloaded
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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