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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 2026-10-11).
Converts a specified amount of a source currency (GTQ) using a self-hosted AI gateway protected by 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
Returns a JSON object containing the result of the currency conversion for the specified GTQ amount, including the converted value and potentially exchange rate metadata.
Example use cases
Travel budget in Guatemalan Quetzals
“I'm traveling to Guatemala and want to know how much 500 GTQ is worth — can you convert that amount for me?”
Cross-border payment calculation
“I need to send 1000 GTQ internationally — what is that amount in USD so I can plan the transfer?”
E-commerce multi-currency pricing
“My store needs to display prices in GTQ — can you convert 1 GTQ so I know the base exchange rate to use for my product listings?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/gtq?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a low-cost, per-call currency conversion for GTQ (Guatemalan Quetzal) amounts, and you are operating in an x402-compatible payment environment using USDC on Base. Ideal for agents that already handle x402 micropayments and need a lightweight, self-hosted alternative to large commercial forex APIs.
Side effects
- Payment not included or insufficient USDC micropayment — returns HTTP 402 Payment Required
- Invalid or missing amount field — returns validation error
- Exchange rate data unavailable or stale — may return error or empty result
- Network timeout on self-hosted gateway — returns 503 or connection error
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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