# x402 AI Gateway — ARS/BTN Currency Converter

> x402 AI Gateway — ARS/BTN Currency 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 from Argentine Peso (ARS) to Bhutanese Ngultrum (BTN), paid via x402 USDC micropayment on Base.

## Facts

- Endpoint: POST https://api.fastapi.online/f/fx/ars/btn?utm_source=zero.xyz
- Price: $0.0002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-ai-gateway-ars-btn-currency-converter-772b3f4d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_eiHzPtStQ4fCJk7fTYQO_

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-ai-gateway-ars-btn-currency-converter-772b3f4d -d '<json body>'
```

Example prompt: Convert 250 Argentine Pesos to Bhutanese Ngultrum for me using the x402 gateway — it'll charge a tiny USDC micropayment automatically.

## When to prefer this

Choose this endpoint when you specifically need ARS-to-BTN conversion and are already operating in an x402 micropayment-enabled environment using USDC on Base. It is ideal for agents that can autonomously handle 402 payment challenges. For high-volume or multi-currency needs, prefer a dedicated FX data provider.

## Known failure modes

- Payment failure — x402 micropayment (0.0002 USDC on Base) not completed or wallet insufficient
- Invalid amount — non-numeric or negative value provided
- Service unavailable — self-hosted gateway offline or overloaded
- Currency pair stale — exchange rate data may be outdated on self-hosted instance
- Empty or malformed response — open response schema means field names are not guaranteed

## 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 from Argentine Peso (ARS) to Bhutanese Ngultrum (BTN) for the specified input amount. The schema is an open object so the exact field names may vary, but the result represents the calculated BTN equivalent.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "amount": {
   "type": "number",
   "description": "Amount of the source currency to convert (default 1)"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-ai-gateway-ars-btn-currency-converter-772b3f4d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.fastapi.online](https://www.zero.xyz/host/api.fastapi.online/llms.txt)