CoinGeckoとExchangeRate-APIを使用してBTC-ETH価格と為替レートAPIを作成

• •HTTP Webhookエンドポイント（n8nが自動生成）
• •ターゲットAPIの認証情報が必要な場合あり

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        "content": "## 🌐 Crypto + FX Micro-API (Webhook JSON)\n\n**What it does:**  \nExposes a lightweight **GET** endpoint that returns **BTC/ETH price + 24h %** and **USD→EUR / USD→NGN** in clean JSON.\n\n**Route:**  \n`/webhook/crypto-fx` (use n8n’s Test or Production URL)\n\n**Flow:**  \n**Webhook (GET)** → ExchangeRate-API → CoinGecko → **Merge** → **Code (build JSON)** → **Respond**\n\n**Example Response:**  \n```json\n{\n  \"btc\": { \"price\": 112417, \"change_24h\": 1.22 },\n  \"eth\": { \"price\": 4334.57, \"change_24h\": 1.33 },\n  \"usd_eur\": 0.854,\n  \"usd_ngn\": 1524.54,\n  \"ts\": \"2025-09-08T08:00:00.000Z\"\n}\n"
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