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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 via a self-hosted AI gateway, gated by an x402 USDC micropayment 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 amount for the specified source amount and currency pair, provided the x402 USDC micropayment on Base is successfully processed.
Example use cases
Travel budget currency check
“I'm heading to Japan next month — can you convert 500 USD to JPY so I know roughly how much spending money I'll have?”
Crypto-to-fiat sanity check
“Convert 1 USDC to USD equivalent so I can see the current exchange value before I make a transfer.”
International invoice calculation
“I need to invoice a client in Euros — can you convert 1200 GBP to EUR so I can put the right amount on the invoice?”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/aoa/vnd?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a micropayment-gated, self-hosted currency conversion that integrates with the x402 payment protocol on Base/USDC. It is appropriate for agents that already have x402 payment capabilities and want a lightweight, per-call-priced conversion without committing to a subscription-based FX API.
Side effects
- Payment not provided or insufficient — returns HTTP 402 requiring x402 USDC micropayment before execution
- Invalid or unsupported currency codes — returns an error or empty result
- Amount field missing or non-numeric — may default to 1 or return a validation error
- Network or gateway downtime on the self-hosted server — returns 5xx error
- x402 facilitator or Base network congestion — payment confirmation delay causing timeout
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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