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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 2026-10-15).
Converts a specified amount of a source currency, using a self-hosted AI gateway protected by x402 USDC micropayment 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
Returns a JSON object containing the conversion result for the specified amount; exact fields depend on the server implementation but typically include the converted value and possibly exchange rate metadata.
Example use cases
Travel budget currency check
“I'm heading to Europe and want to know what 500 of my source currency converts to — can you run that through the AI gateway and give me the result?”
E-commerce price localization
“We need to display localized prices on our store — can you convert an amount of 1 unit through the AI gateway so I can see the base conversion rate?”
Automated financial reporting
“For our monthly report, convert 10000 units through the currency conversion endpoint and return the result so I can include it in the spreadsheet.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/lsl?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call currency conversion via a self-hosted AI gateway that accepts x402 USDC micropayments on Base, and you want extremely low cost ($0.0002 per call). Ideal for high-frequency automated agents that need cheap, programmatic currency lookups without committing to a subscription-based FX API.
Side effects
- Payment not attached or insufficient USDC micropayment — returns HTTP 402 Payment Required
- Invalid or missing 'amount' field — returns 400 Bad Request or validation error
- Server-side AI inference failure — returns 500 Internal Server Error
- Network timeout on self-hosted endpoint — connection refused or timeout
- Unsupported currency pair — may return empty or 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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