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x402 AI Gateway – Currency Conversion Endpoint
x402
x402 AI Gateway – Currency Conversion Endpoint 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 one currency to another, gated by a USDC micropayment on Base via the x402 protocol.
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 converted currency value for the specified amount. The exact fields depend on the gateway implementation, but typically includes the result of the conversion.
Example use cases
Real-time travel expense conversion
“I'm budgeting for a trip to Japan — can you convert 1500 USD to JPY so I know roughly what I'm working with?”
Automated invoice currency normalization
“Our invoices come in mixed currencies. Convert 3200 GBP to USD so I can normalize it into our reporting.”
Crypto-adjacent fiat conversion check
“I need to know what 500 EUR is worth in CHF right now — can you run it through the currency converter?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/uyu?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, programmatic currency conversion without a subscription key, and you are already operating within an x402-compatible payment flow using USDC on Base. It is especially suitable for AI agents that handle their own micropayments autonomously.
Side effects
- Payment not included or rejected — 402 Payment Required response; agent must attach valid USDC micropayment on Base
- Invalid or missing amount field — may return a 422 or 400 validation error
- Unsupported currency pair — gateway may return an error if the source/target currencies are not recognized
- Network or gateway downtime — 5xx error from the self-hosted server
- Insufficient payment amount — payment below $0.0002 USDC threshold rejected
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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