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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 2026-10-11).
Converts a specified amount of one currency to another, 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 converted currency value or exchange result for the specified amount. Exact output fields are unspecified in the schema but expected to include the converted amount.
Example use cases
Real-time FX amount lookup
“How much is 500 in the source currency worth after conversion? Use the x402 micropayment gateway on fastapi.online and pay with USDC on Base.”
Automated finance pipeline conversion
“In my automated bookkeeping workflow, convert 1000 units through the x402-gated currency endpoint on fastapi.online and give me the converted value.”
Single-unit exchange rate check
“What does 1 unit of the source currency convert to? Use the micropayment-gated converter at fastapi.online and deduct the $0.0002 USDC fee.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/lrd?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a pay-per-call, self-hosted currency conversion that is gated by an x402 USDC micropayment on Base, particularly when minimizing per-call cost ($0.0002 USDC) and avoiding subscription-based FX APIs. Suitable for agents with x402 payment capability that need lightweight, on-demand currency conversion without API key management.
Side effects
- Payment not provided or insufficient — endpoint returns HTTP 402 requiring x402 USDC micropayment on Base
- Invalid or missing amount field — endpoint may return validation error
- Network or gateway error on the self-hosted server — returns 5xx
- Unsupported currency pair — may return empty or error response
- Amount of 0 or negative — may produce unexpected result
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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