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x402 AI Gateway – Currency Model Endpoint
x402
x402 AI Gateway – Currency Model Endpoint is a paid API for AI agents from api.fastapi.online, paid per call via x402, $0.0002/call, status unknown (last checked 2026-10-16).
Executes a paywalled AI model endpoint for currency-related computations (likely currency conversion or financial model), requiring a micropayment in USDC on Base via x402 before processing.
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
An unstructured JSON object containing the AI model's computed output — likely a currency conversion result or financial inference value — returned after the x402 micropayment is validated and the model executes.
Example use cases
On-demand currency conversion via AI
“I need to convert 500 units of currency using the x402 AI model endpoint — go ahead and pay the micropayment and give me the result.”
Paywalled financial model query
“Run the x402 AI gateway model with an amount of 1000 and pay the USDC fee automatically, then tell me what the model returns.”
Automated micropayment AI inference pipeline
“Every time I need a currency value computed, hit that x402 micropayment endpoint with the amount I specify and return the AI model's output without me having to manually approve each tiny payment.”
Technical details
Endpoint
POSThttps://api.fastapi.online/f/fx/ang/mdl?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a very cheap ($0.0002 USDC), per-call AI inference result for currency-related computations and your agent supports x402 micropayment flows on Base. It is ideal for automated pipelines that need many small, inexpensive AI calls without a subscription or API key, and where the x402 payment protocol is already integrated.
Side effects
- Payment not accepted (402 response if USDC micropayment fails or wallet has insufficient balance)
- Invalid or missing 'amount' field returns a 422 validation error
- Model execution failure returns a 500 server error
- Rate limiting or quota exceeded on the self-hosted inference server
- Network timeout if the self-hosted backend is unavailable
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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