# fx

> Currency conversion at the official European Central Bank reference rate (via Frankfurter), with rate date. 30+ fiat currencies.

- URL: https://x402-gateway.forge-x402.workers.dev/api/fx (GET or POST)
- Price: 0.001 USDC on Base (1000 atomic USDC)
- MCP tool: fx
- Docs: https://agent-hub.dentreprise.workers.dev/tools/fx/

## Parameters

- `from` (string, required): from
- `to` (string, required): to
- `amount` (string): amount
- `date` (string): optional YYYY-MM-DD historical rate

## Unpaid example

```bash
curl -sS -D - "https://x402-gateway.forge-x402.workers.dev/api/fx?from=EUR&to=USD&amount=100"
```

## Example 402 challenge

```json
{
  "x402Version": 2,
  "error": "Payment required",
  "resource": {
    "url": "https://x402-gateway.forge-x402.workers.dev/api/fx",
    "description": "Currency conversion at the official European Central Bank reference rate (via Frankfurter), with rate date. 30+ fiat currencies.",
    "mimeType": "application/json"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "1000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x7B8bf45ac6AcbA6D4CFB626b57D3f5fF3C9C89F7",
      "maxTimeoutSeconds": 120,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}
```

## Example response

```json
{
  "from": "EUR",
  "to": "USD",
  "amount": 100,
  "rate": 1.1267,
  "result": 112.67,
  "date": "2026-11-04",
  "source": "ECB"
}
```

## Free demo / sample

The original gateway does not serve `?demo=1`. A labelled sample is published on this hub.

```bash
curl -sS "https://agent-hub.dentreprise.workers.dev/demo/fx.json"
```

```json
{
  "demo": true,
  "demo_label": "DEMO / SAMPLE — not live data. This is a labelled example response and was not charged.",
  "charged": false,
  "tool": "/api/fx",
  "docs": "https://agent-hub.dentreprise.workers.dev/tools/fx/",
  "how_to_get_live_data": "Call the live URL on the original gateway with an x402 v2 client (@x402/fetch or the Python package x402). This file is a labelled sample only.",
  "sample": {
    "from": "EUR",
    "to": "USD",
    "amount": 100,
    "rate": 1.1267,
    "result": 112.67,
    "date": "2026-11-04",
    "source": "ECB"
  }
}
```

## Clients

- JS (x402 v2): `@x402/fetch` + `@x402/evm` (`wrapFetchWithPaymentFromConfig`, `ExactEvmScheme`). The older package `x402-fetch` is deprecated v1.
- Python: PyPI package `x402` (`x402HttpxClient` or `x402_requests`, `register_exact_evm_client`, `EthAccountSigner`).
- MCP: stdio `node src/server.mjs` in [forge-agent-mcp](https://github.com/forge-agent-hub/forge-agent-mcp); hosted Streamable HTTP at https://x402-gateway.forge-x402.workers.dev/mcp (original gateway tools).
- LangChain: wrap those clients with `DynamicStructuredTool` (`@langchain/core`) or `@tool` (`langchain_core`).
- Copy-paste snippets: https://agent-hub.dentreprise.workers.dev/tools/fx/ and https://agent-hub.dentreprise.workers.dev/quickstart/