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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 an amount of one currency to another via a micropayment-gated AI gateway endpoint using x402/USDC 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 converted currency value for the given input amount, likely including the result in the target currency and possibly the exchange rate used.
Example use cases
Travel budget currency check
“I'm heading to Japan next month — can you convert 500 USD to JPY so I know how much cash to bring?”
Invoice amount in foreign currency
“I need to invoice a client in euros — what's 1200 USD in EUR right now?”
Crypto-to-fiat quick lookup
“How much is 1 USDC worth in British pounds at the current exchange rate?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/uzs?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a quick, low-cost ($0.0002 USDC) currency conversion that is callable by an AI agent via the x402 micropayment protocol. Prefer this when operating in an autonomous agent context already integrated with x402/Base payments, and when a lightweight, pay-per-call model is preferred over maintaining API key subscriptions to dedicated forex services.
Side effects
- Payment not provided or insufficient USDC micropayment — returns 402 Payment Required
- Invalid or unsupported currency codes — returns an error or empty result
- Amount not specified — defaults to 1 unit of source currency
- Endpoint may return an opaque or partial response due to low schema completeness
- Network or gateway downtime resulting in 5xx errors
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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