NSE blocks automated requests via TLS fingerprint detection. The relay runs a tiny script in your browser that fetches data from NSE inside your real Chrome session and sends it here automatically.
One-time setup (~30 seconds):

1. Open nseindia.com/option-chain in a Chrome tab and let it fully load
2. Press F12 to open DevTools → click the Console tab
3. Copy the script below → paste into the Console → press Enter
4. You'll see ✓ NIFTY relayed — keep the tab open; it auto-refreshes every 2 min

NSE blocks automated requests. Paste your browser cookies once/day to enable live data.
How: Open nseindia.com/option-chain in Chrome → F12 → Network tab → click the option-chain-indices request → Headers → Request Headers → right-click Cookie → Copy value → paste below.