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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 from one currency to another, requiring a micropayment in USDC 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 converted currency amount and likely the applicable exchange rate or conversion details for the requested currency pair and input amount.
Example use cases
Travel budget currency conversion
“I'm planning a trip to Japan — can you convert 500 USD to JPY so I know roughly how much spending money I'll have?”
E-commerce international pricing
“We're listing a product priced at 89 EUR — can you convert that to GBP, USD, and CAD so we can set international prices?”
Freelance invoice in foreign currency
“My client wants to pay in Swiss francs but my invoice is 1200 AUD — how much is that in CHF right now?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/hrk?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call currency conversion integrated into an x402-compatible agent workflow on Base/USDC, and want to avoid subscription-based FX APIs. Particularly useful for agents that only occasionally need conversions and want to pay fractions of a cent per call rather than maintaining API key subscriptions.
Side effects
- Payment failure: x402 micropayment not completed or insufficient USDC balance, resulting in 402 Payment Required response
- Invalid currency codes: unrecognized or unsupported currency pair returns an error
- Amount out of range: zero or negative amount may cause validation error
- Network/gateway unavailability: self-hosted service may be intermittently offline
- Missing required parameters: omitting amount or currency codes may result in a 422 Unprocessable Entity 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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