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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 a source currency, gated behind 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 given amount; exact fields depend on the server implementation but typically include the converted value and possibly exchange rate metadata.
Example use cases
Quick travel currency estimate
“How much is 500 in the source currency after conversion? Just run the calculation for me — I'll pay the micropayment fee.”
E-commerce checkout conversion
“I need to convert 1200 units of the source currency for a purchase I'm making — can you run that conversion and give me the result?”
Automated FX pipeline step
“As part of my pricing workflow, convert an amount of 75 in the source currency and return the converted value so I can update my records.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/lbp?utm_source=zero.xyzWhen to prefer
Prefer this endpoint when you need a lightweight, low-cost ($0.0002 USDC) currency conversion that is gated by an x402 micropayment and you are operating in an agent or wallet environment already set up to handle x402 payment flows on Base. Not recommended when you need free, unlimited, or enterprise-grade FX data with guaranteed SLAs.
Side effects
- Payment not received or invalid x402 micropayment — endpoint returns 402 Payment Required before executing
- Invalid or missing amount parameter — may return a 422 validation error
- Unsupported or unspecified currency — may return an error or unexpected result
- Server unavailable — self-hosted infrastructure may have higher downtime risk than managed APIs
- Ambiguous input schema — 'amount' alone without an explicit source/target currency may yield unexpected defaults
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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