Create app.py

app.py

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+import os
+from flask import Flask, request, jsonify
+from flask_cors import CORS
+import requests
+import pytz
+from datetime import datetime, timedelta
+
+app = Flask(__name__)
+CORS(app)
+
+# Load API key from environment variable
+API_KEY = os.environ.get("CONV_TOKEN")
+if not API_KEY:
+    raise ValueError("API Key not found! Set CONV_TOKEN environment variable.")
+
+API_URL = f"https://v6.exchangerate-api.com/v6/{API_KEY}/latest/USD"
+
+# Los Angeles timezone
+LA_TZ = pytz.timezone("America/Los_Angeles")
+
+# Cache storage
+cached_rates = {}
+last_updated = None  # Store last update in LA time
+
+def fetch_exchange_rates():
+    """Fetch exchange rates from API and store them for 24 hours (Los Angeles time)."""
+    global cached_rates, last_updated
+
+    response = requests.get(API_URL)
+    if response.status_code == 200:
+        data = response.json()
+        cached_rates = data["conversion_rates"]
+        last_updated = datetime.now(LA_TZ)  # Store timestamp in LA timezone
+        return True
+    return False
+
+@app.route("/rate", methods=["GET"])
+def get_exchange_rate():
+    """Returns only the exchange rate for a given currency, refreshed every 24 hours (Los Angeles time)."""
+    global cached_rates, last_updated
+
+    from_currency = request.args.get("from", "").upper()
+
+    # Get current Los Angeles time
+    now_la = datetime.now(LA_TZ)
+
+    # If cache is older than 24 hours, refresh rates
+    if last_updated is None or (now_la - last_updated) > timedelta(hours=24):
+        success = fetch_exchange_rates()
+        if not success:
+            return jsonify({"error": "Failed to fetch exchange rates"}), 500
+
+    if from_currency in cached_rates:
+        return jsonify({
+            "from": from_currency,
+            "rate": cached_rates[from_currency],
+            "last_updated": last_updated.strftime("%Y-%m-%d %H:%M:%S %Z")
+        })
+    else:
+        return jsonify({"error": "Currency not supported"}), 400
+
+if __name__ == "__main__":
+    fetch_exchange_rates()  # Pre-load rates
+    app.run(host='0.0.0.0', port=7860)