See beneath the price
Undertow measures how much of each crypto asset actually sits in exchange wallets — and tells you when that changes.
We tell you
Nobody opens an app to scan tables. Unusual moves arrive as a notification with the numbers already in it.
Our own data
Balances read directly from six blockchains every 10 minutes. Nothing licensed from a third party.
Measurement, not prediction
No signals, no scores, no price targets. Every number is a historical measurement you can verify.
Privacy by subtraction
No wallet connection. No location. No advertising ID — we don't even ask for tracking permission.
A rising exchange balance can mean coins arrived to be sold — or that an institution moved custody. We show the measurement and the context, and leave the call to you.
What it measures
Exchange reserves
24h / 7d / 30d change, ranked and z-scored against each asset's own history.
Stablecoin Barometer
Total stablecoins on exchanges — the one on-chain metric with no interpretation ambiguity.
Whale transfers
Classified, with internal rotations and bridge movements filtered out.
Derivatives
Funding, open interest, basis and live liquidations.
Undertow is an information and data-visualisation tool. It does not provide investment advice or buy/sell recommendations. Crypto assets are high risk and you may lose the entire amount you invest.
How it works
We read the chain
Every 10 minutes we pull balances directly from six blockchains across eleven exchanges — no third-party licensed data.
We measure what changed
Each balance is ranked and z-scored against its own history, so "unusual" means unusual for that specific asset — not a fixed threshold.
We tell you
Only measured anomalies reach your notifications — capped daily, with quiet hours, and only for assets you actually watch.
Free and Premium
Free
- Top 20 assets
- 24h window
- 60-minute delayed data
- Stablecoin Barometer
- 5 watchlist slots
- 3 alert rules
- No ads, ever
Premium
- Every asset, not just top 20
- Every time window
- Real-time data, no delay
- Full history
- Exchange-by-exchange breakdown
- Unlimited alerts
- Instant push notifications
Questions
Is Undertow a trading or investment advice app?
No. Undertow is a measurement tool. It shows what has already happened on-chain — it never predicts prices, issues buy/sell signals, or gives investment advice. What you do with the measurement is entirely up to you.
Where does the data come from?
Directly from the blockchains themselves — balances are read via RPC every 10 minutes and cross-checked against known exchange addresses. Nothing is licensed or scraped from a third-party aggregator, which is also why we can tell you exactly where our data has gaps.
Do I need to connect a wallet?
No, and you can't — Undertow has no wallet-connection feature at all. We only read public exchange addresses, never yours.
Can I cancel anytime?
Yes. Subscriptions are billed through the App Store or Google Play and can be cancelled at any time from your device's subscription settings — access continues until the end of the period you already paid for.
How do I delete my account?
Settings → Delete account, inside the app. No email required. Personal data is erased immediately.