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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 2026-10-12).
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 specified amount; exact fields depend on the endpoint implementation but expected to include the converted value or rate information.
Example use cases
Travel budget currency conversion
“I need to convert 500 dollars worth — can you run that through the x402 currency converter and tell me what I get back?”
E-commerce pricing in local currency
“Run a conversion for an amount of 1000 through the x402 gateway so I can display local pricing on my checkout page.”
Automated micropayment-gated FX check
“Use the x402 currency converter to calculate what 75 units converts to — I want to check the rate before processing a transaction.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/yer?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a low-cost, per-call currency conversion with programmatic micropayment gating via x402 on Base (USDC). Ideal for agents that need occasional FX lookups without a subscription, or for workflows that benefit from pay-per-use pricing at $0.0002 per call. Less suitable if you need guaranteed SLA, detailed currency metadata, or bulk conversions.
Side effects
- Missing or failed x402 USDC micropayment results in 402 Payment Required before execution
- Invalid or missing 'amount' field may return a 422 validation error
- Downstream currency data unavailable may return a 500 or empty result
- Insufficient USDC balance on Base network blocks the call
- Malformed request body returns a 400 Bad Request
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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