# x402 AI Gateway – Currency Conversion Endpoint

> 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 2026-10-10).

Converts a specified amount of a source currency via a self-hosted AI gateway that requires a micropayment (USDC on Base) before executing.

## Facts

- Endpoint: POST https://api.fastapi.online/f/fx/ang/gel?utm_source=zero.xyz
- Price: $0.0002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-ai-gateway-currency-conversion-endpoint-b50127b3
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6f_NfbQKVDIGhMhDyDQf0

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-currency-conversion-endpoint-b50127b3 -d '<json body>'
```

Example prompt: Convert 250 USD to EUR using the self-hosted x402 gateway — pay the micropayment fee automatically and give me the result.

## When to prefer this

Choose this endpoint when you need a lightweight, self-hosted currency conversion that is gated by a tiny USDC micropayment on Base, particularly in agent workflows where x402 payment flows are already established and you want to avoid centralized API key management.

## Known failure modes

- Payment not made or insufficient USDC balance — 402 Payment Required response
- Invalid or missing amount field — validation error
- Unsupported currency pair — error or empty result
- Gateway downtime or self-hosted service unavailable — 5xx error
- Network timeout if Base blockchain payment confirmation is slow

## 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 or exchange result for the given input amount and currency pair.

## 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-currency-conversion-endpoint-b50127b3/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)