Crypto whale watching
Know the moment a whale breaks the surface.
Blackfin Compass watches exchange trade prints and the Bitcoin mempool, flags the movements that dwarf the crowd, and shows you the evidence behind every sighting.
Free to use. No account, no wallet connection.
Largest sightings right now
How it works
Large money leaves a wake. We trace it back to the source.
- Step 1 · Spot
Every print, every pending transfer
We listen to recent trades on Coinbase for BTC, ETH, SOL and XRP, and to unconfirmed Bitcoin transactions as they reach the mempool.
- Step 2 · Score
Measured against the crowd
Each trade is compared with the median print in its window, so a $50K order in a quiet market stands out. A log-scale whale score keeps sizes comparable across assets.
- Step 3 · Show
Evidence, not hunches
Every sighting opens a source trace: trade ID, taker side, tx hash, fee rate and a direct link to verify it yourself on the original venue.
The terminal
One screen. Stream, chart, flow and proof.
- Whale stream
- Filter by exchange or on-chain, set a minimum notional, search by asset, tx hash or trade ID.
- Price context
- Coinbase candles with session VWAP and a marker at the exact minute each whale surfaced.
- Whale flow
- Net aggressor buying versus selling per asset, so you can see which way the big fins lean.
- Event evidence
- Value, USD estimate, inputs and outputs, fee rate and a one-click link to verify at the source.
Pricing
Start watching free. Upgrade when you want the alert.
Observer
Freeforever
The live terminal, open to everyone.
- Live whale stream for BTC, ETH, SOL, XRP
- Exchange prints and Bitcoin mempool
- Price chart with whale markers
- Evidence and source links
Navigator
Early access$24per month
For traders who want the sighting before they look.
- Everything in Observer
- Custom size thresholds per asset
- Email and Telegram alerts
- Saved watchlists
- 30-day sighting history
Desk
Customfor teams
Whale data piped into your own tools.
- Everything in Navigator
- REST API and webhooks
- Additional venues and chains
- Team seats and shared alerts
FAQ
Questions from the observation deck
What counts as a whale?
For exchange trades, a print that is many times larger than the median trade in the same window. For Bitcoin, a pending transaction whose outputs total a large USD value. Every sighting carries a whale score so you can compare sizes across assets.
Where does the data come from?
Trade prints and candles come from the public Coinbase Exchange API. Unconfirmed Bitcoin transactions come from Blockchain.com. We link every sighting back to its source so you can verify it.
Can an on-chain transfer be misleading?
Yes. Output totals include change returned to the sender, so the amount actually moving between parties may be lower. The evidence panel calls this out on every on-chain sighting.
Do I need to connect a wallet or create an account?
No. The terminal is free and read-only. We never ask for keys, seed phrases or wallet connections.
Is this trading advice?
No. Blackfin Compass surfaces public market data. Large movements can be internal transfers, hedges or rebalancing. Treat sightings as context, not signals to buy or sell.