🌐 Crypto + FX Micro-API (Webhook JSON)

📌 Overview

Spin up a tiny, serverless-style API from n8n that returns BTC/ETH prices & 24h changes plus USD→EUR and USD→NGN from public, no-key data sources. Ideal for dashboards, low-code apps, or internal tools that just need a simple JSON feed.

⚙️ How it works

1. Webhook (GET /crypto-fx) — entrypoint for your client/app.
2. HTTP: ExchangeRate-API — USD-base FX rates (no API key).
3. HTTP: CoinGecko — BTC/ETH prices + 24h % change (no API key).
4. Merge — combines payloads.
5. Code (v2) — shapes a clean JSON:
   • btc.price, btc.change_24h
   • eth.price, eth.change_24h
   • usd_eur, usd_ngn, ts (ISO timestamp)
6. Respond to Webhook — returns the JSON with HTTP 200.

🛠 Setup Guide

1. Webhook path & URL
   In the Webhook node, confirm HTTP Method = GET and Path = crypto-fx.
   Use the Test URL while building; switch to Production URL for live usage.
2. Test the endpoint
   Curl:
   curl -s https://<your-n8n-host>/webhook/crypto-fx
   Browser / fetch():
   fetch('https://<your-n8n-host>/webhook/crypto-fx')
   .then(r => r.json())
   .then(data => console.log(data))
3. Response mapping (already wired)
   Respond to Webhook → Response Body is set to {{$json}}.
   The Code node outputs the exact JSON structure shown above, so no extra mapping is required.

🔐 Security (recommended)
Add a Webhook Secret (query header check in Code node) or IP allowlist via your reverse proxy.
If embedding in public sites, proxy through your backend and apply rate-limit/cache headers there.

🚀 Usage ideas
Frontend dashboards (Chart.js, ECharts).
HomeAssistant / Node-RED info panels.
Google Apps Script to store the JSON into Sheets on a timer.

🎛 Customization
More coins: extend CoinGecko ids= (e.g., bitcoin,ethereum,solana).
More FX: read additional codes from fx.rates and add to the payload.
Timestamps: convert ts to your preferred timezone on client side.
CORS: if calling from browsers, add CORS headers in Respond (options → headers).

🧩 Troubleshooting
Empty/partial JSON: run the two HTTP nodes once to verify responses.
429s / rate limiting: add a short Wait node or cache outputs.
Wrong URL: ensure you’re using Production URL outside the n8n editor.
Security errors: if you add a secret, return 401 when it’s missing/invalid.