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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 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 result of the currency conversion for the specified amount; exact fields depend on the server implementation but likely include the converted value and possibly exchange rate metadata.
Example use cases
Automated FX rate fetch for invoicing
“I need to convert 500 units of currency for my invoice calculation — use the x402 micropayment API and pay the $0.0002 USDC fee automatically from my Base wallet.”
Pay-per-use currency check in workflow
“In my automated expense pipeline, convert 1 unit of the source currency so I can get the current rate — just pay the micropayment and return the result.”
Spot conversion for crypto treasury
“Convert 1000 units using the x402-gated currency endpoint, deducting the USDC micropayment from my Base account, so I can update my treasury spreadsheet.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/vuv?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a low-cost, pay-per-call currency conversion that integrates natively with the x402 micropayment protocol on Base (USDC), especially in automated agent workflows where per-call billing via crypto micropayments is preferred over subscription APIs.
Side effects
- 402 Payment Required if x402 micropayment is not attached or insufficient
- Invalid amount input (non-numeric or negative values)
- Upstream currency data unavailable causing 500 error
- Malformed request body missing required 'amount' field
- Network timeout if self-hosted server 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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