I built WhaleTrack a few weeks ago — a live dashboard that tracks the biggest wallets on Polymarket. Got some good traction, a few hundred users, and a free Twitter bot posting whale alerts automatically.
Then someone asked me: "Why would I pay for this when you're posting the same data for free on Twitter?"
Fair question. It made me rethink what the product actually was.
The Problem With Twitter Alerts
The Twitter bot works fine. It detects a whale trade and posts within the next 5-minute polling cycle. But here's the thing — by the time it posts, the window is already closing.
Polymarket is liquid. If a whale drops $50K on a market and moves the price, people who see the tweet 20 minutes later are buying into an already-shifted market.
Speed is the product. Not the data.
Free users get the data. Premium users get it first.
The Architecture
Zero npm dependencies — same as the first article. Pure Node.js with the built-in https and crypto modules.
The bot uses long polling instead of webhooks:
async function poll() {
while (true) {
try {
const data = await fetchJson(
https://api.telegram.org/bot${BOT_TOKEN}/getUpdates?offset=${offset}&timeout=30
);
for (const u of (data.result || [])) {
offset = u.update_id + 1;
const msg = u.message;
if (msg?.text?.startsWith('/')) {
handleCommand(msg.chat.id, msg.text);
}
}
} catch (e) {
await new Promise(r => setTimeout(r, 5000));
}
}
}
Long polling holds the connection open for 30 seconds waiting for updates, then immediately reconnects. No webhooks needed, no server config, works fine from a Mac running 24/7.
Two Alert Tiers
Every whale trade fires two alerts — premium first, free after.
Free alert:
🐋 Whale Alert!
somalianKing just bought
🟢 Yes $47K @ 62¢
📊 Will Argentina win the World Cup?
🔓 Get win rate + instant alerts → upgrade to Premium
🌐 whaletrack.app
Premium alert (fires first):
⚡ PREMIUM Whale Alert
somalianKing just bet $47,000
🟢 Yes @ 62¢
📊 Will Argentina win the World Cup?
🐋 This whale's track record:
• Rank: #3 on Polymarket
• Total P&L: +$284K
• Win rate: 71% (34 resolved trades)
🎯 Copy this bet on Polymarket →
⏱ You're seeing this 10+ min before Twitter
The premium alert has three things free doesn't: win rate, P&L context, and a direct affiliate link to copy the bet.
The Win Rate Calculation
This was the interesting part. Polymarket doesn't give you a clean "won/lost" field on activity records — you have to infer it from sell prices.
The logic:
Fetch last 50 trades for a wallet
Filter for SELL transactions only
Sold at ≥ 0.85 = win (exited near $1 resolution)
Sold at ≤ 0.15 = loss (exited near $0 resolution)
Everything in between = position still live or unclear
async function fetchWinRate(address) {
const activity = await fetchActivity(address, 50);
const sells = activity.filter(t => t.side === 'SELL' && parseFloat(t.price || 0) > 0);
let wins = 0, losses = 0;
for (const t of sells) {
const price = parseFloat(t.price || 0);
if (price >= 0.85) wins++;
else if (price <= 0.15) losses++;
}
const total = wins + losses;
return total > 0 ? Math.round((wins / total) * 100) : null;
}
I cache the result for 30 minutes per wallet since it's an expensive-ish call (50 activity records per whale).
Premium Subscriber Management
Kept it dead simple — a JSON file on disk.
let premiumSubs = loadJson(PREMIUM_SUBS_FILE, []); // [chatId, chatId, ...]
When someone pays (manually verified for now), I run /addpremium in my own chat with the bot. It adds them to the array, saves the file, and sends them a welcome message.
No Stripe, no database, no webhook. Works fine at this scale.
The Speed Advantage in Practice
The polling cycle runs every 5 minutes. Premium fires at the top of the cycle. Free fires at the bottom — after premium has already been delivered.
In practice this means premium users see alerts 5–10 minutes before the Twitter bot posts, and 10–20 minutes before anyone on Twitter actually sees it and acts on it.
On a fast-moving market, that gap matters.
What I Learned
Speed is a real value prop. Not "more features" — just faster. Simple to understand, easy to sell.
Long polling is underrated. Webhooks need a server with a public URL and SSL. Long polling works from anywhere. For a side project, that simplicity is worth it.
Keep the free tier genuinely useful. The free alert is still real value. Premium isn't a paywall on the core product — it's an upgrade on timing and context. That distinction matters for trust.
Manual premium management is fine at the start. Don't build Stripe until you have 10 paying customers. A JSON file is enough to validate demand.
What's Next
Proper payment flow (Stripe or Gumroad)
Filter premium alerts by whale win rate threshold (only fire if whale is 60%+ win rate)
Web dashboard showing premium-only whale analytics
Bot is live at @WhaleTrackBot on Telegram. Free tier available, premium is $9/month.
Live site: whaletrack.app
Happy to answer questions about the Telegram API, win rate logic, or the alert architecture.
