Undertow: Crypto Flows

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About this app

Undertow measures what price charts do not show: how much of each crypto asset
actually sits in exchange wallets, and what happens when that amount moves.

We read balances directly from the blockchain every 10 minutes across six
chains and eleven exchanges. Nothing is licensed from a third party — which
is why we can show you exactly which addresses we track and where our data
has gaps.

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WE TELL YOU. YOU DON'T HUNT.

Nobody opens an app to scan tables. Radar is a feed of measured anomalies:
when an exchange reserve moves unusually, when whales cluster, when
liquidations cascade — it arrives with the numbers already in it.

Notifications have a daily cap and quiet hours. If you set a watchlist, only
those assets reach you.

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WHAT YOU GET

• Exchange reserves — 24h, 7d and 30d change for every tracked asset,
ranked and z-scored against each asset's own history
• Stablecoin Barometer — total stablecoins held 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
• Premiums — cross-exchange spreads and stablecoin peg deviation
• Token unlocks — with the share of circulating supply, not just the amount

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MEASUREMENT, NOT PREDICTION

Undertow never tells you what will happen. 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.

There are no signals, no scores, no price targets. Every number is a
historical measurement you can verify.

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PRIVACY BY SUBTRACTION

No wallet connection. No location. No contacts, camera or microphone.
No advertising ID — we don't even ask for tracking permission, because we
do no tracking. No password: sign in with Google or Apple.

Data not collected cannot leak.

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FREE AND PREMIUM

Free: top 20 assets, 24h window, 60-minute delayed data, the Stablecoin
Barometer, 5 watchlist slots, 3 alerts. No ads, ever.

Premium: every asset, every time window, real-time data, full history,
exchange-by-exchange breakdown, unlimited alerts and instant notifications.

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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.

What’s new

Gamma exposure for BTC and ETH options: total GEX, the gamma flip level, and the strikes carrying the most gamma — with an always-visible note on the assumption behind it.
Whales vs the crowd: positioning now separates large position holders from all accounts.
Bitcoin network health: hashrate trend, fees and mempool depth.
DEX share of spot volume: how much trading exchange flows cannot see.
You now stay signed in between sessions, and every feature lives in the tab it belongs to.