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x402 AI Gateway — Currency Conversion
x402
x402 AI Gateway — Currency 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, gated behind an x402 USDC micropayment on Base before executing.
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, computed at current exchange rates. The exact response schema is open-ended but expected to include the result of the conversion.
Example use cases
Real-time FX rate for invoicing
“I need to invoice a client in Japan — can you convert 5000 USD to JPY right now so I know the current amount to put on the invoice?”
Crypto portfolio valuation
“Convert 2.5 ETH to USD using the x402 currency API so I can see what my holdings are worth in dollars today.”
Travel budget estimation
“I'm heading to London next month — convert 1000 CAD to GBP so I know roughly how much spending money I'll have.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/lak?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, cheap currency conversion via a self-hosted gateway and your agent stack already supports x402 micropayment flows on Base (USDC). At $0.0002 per call it is cost-effective for high-frequency conversions. Prefer it when you want to avoid centralized FX API key management and instead use crypto-native pay-per-use access.
Side effects
- Payment not attached or insufficient USDC balance returns HTTP 402 Payment Required
- Invalid or unsupported currency codes may return an error or empty result
- Malformed amount (e.g. negative or non-numeric) may cause a 422 Unprocessable Entity
- Service unavailability due to self-hosted infrastructure downtime returns 5xx
- Missing amount field may default to 1 or return a validation 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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