Exchange Flows

3.1 Coins leaving the building

Hash showed Mint a chart. Over a year, the amount of bitcoin held on exchanges had steadily fallen.

"People keep taking their bitcoin off exchanges," said Hash. "What do you think that means?"

Mint thought. "If they wanted to sell, they'd leave it on the exchange. If they're taking it off, maybe they plan to hold."

"That's the classic interpretation," said Hash. "It's often right. But not always. Let's see why."

3.2 Why exchange flows matter

Centralised exchanges are where most crypto is bought and sold (Module 1, Chapter 7). To sell coins held in a self-custody wallet, a holder usually needs to send them to an exchange first. To withdraw purchased coins into self-custody, a buyer sends them out.

That makes exchange flows a rough indicator of intent:

Flow	Common interpretation
Inflows (coins moving to exchanges)	Potential selling pressure; holders preparing to sell or use as margin
Outflows (coins leaving exchanges)	Potential accumulation; coins moving to long-term storage
Netflow (inflows minus outflows)	The overall direction
Exchange reserves (total held on exchanges)	Available supply that could be sold quickly

3.3 A worked example

One day of Bitcoin exchange flows (illustrative)	BTC
Inflows to all labelled exchanges	25,000
Outflows from all labelled exchanges	32,000
Netflow	−7,000
Exchange reserves at the start of the day	2,400,000
Exchange reserves at the end of the day	2,393,000

A negative netflow of 7,000 BTC means more bitcoin left exchanges than arrived. If this continues for weeks, exchange reserves fall steadily, sometimes described as a supply squeeze: less supply readily available to sell.

Chapter 3 · Exchange flows and reserves

Coins flow into an exchange and out of it; netflow is inflow minus outflow. In the example, 25,000 coins in and 32,000 out give a net outflow of 7,000, lowering reserves from 2.4 million toward 2.393 million. Reserves only reflect addresses that analysts have labelled.

3.4 Large inflows

Analysts often watch for unusually large inflows, especially from whales or long-term holders. A sudden spike of inflows, particularly from addresses that have held coins for a long time, can signal intent to sell.

But inflows don't always mean selling:

1. Coins may be deposited as collateral for derivatives trading or loans.
2. They may be moved to an exchange's custody service, rather than for sale.
3. An over-the-counter (OTC) desk may receive coins for a large private trade that doesn't hit the exchange's order book.
4. The exchange itself may be moving coins between its own wallets, if labels are incomplete (Chapter 2).

3.5 Outflows aren't always accumulation

Similarly, outflows have several possible explanations:

1. Buyers withdrawing to self-custody, the classic accumulation signal.
2. Coins moving to ETF custodians or institutional custody providers.
3. Coins moving to DeFi, for example bridging to another chain or depositing into lending protocols.
4. An exchange migrating to new wallets that aren't labelled yet, which can look like a huge outflow.
5. Coins moving to another exchange, which is a shift, not a removal from the market.

That fourth case has caused many false alarms. A sudden "record outflow" sometimes turns out to be an exchange restructuring its wallets.

"So I should be most suspicious of the most dramatic numbers," said Mint.

"Dramatic numbers deserve the most checking," said Hash. "Real trends are usually gradual. Sudden jumps are often data issues."

3.6 Structural changes

Exchange reserve trends have been affected by changes in market structure:

ETFs. Spot Bitcoin and Ether ETFs (Module 1, Chapter 9) hold coins with custodians. Some of those custodians also run exchanges. Depending on how platforms label custodial wallets, ETF holdings can be counted inside or outside "exchange reserves."

Self-custody trends. After exchange collapses like FTX in 2022, many users moved coins into self-custody, which pushed reserves down for reasons that had little to do with price expectations.

Layer 2 and DeFi growth. Activity that moves to other chains or protocols may not show up as exchange flows on the main chain.

These changes mean that comparing today's exchange reserves with those from several years ago isn't always like-for-like.

3.7 Stablecoin exchange flows

Exchange flows aren't just for volatile assets. Stablecoins flowing into exchanges can be read as potential buying power: dollars arriving, ready to buy crypto. Stablecoins flowing out can mean the opposite. Chapter 8 covers stablecoin flows in detail.

Combining the two can be revealing:

Bitcoin flows	Stablecoin flows	Possible interpretation
Out of exchanges	Into exchanges	Buying power arriving, supply leaving: potentially bullish
Into exchanges	Out of exchanges	Supply arriving, buying power leaving: potentially bearish
Mixed	Mixed	No clear signal

3.8 Using exchange flows well

Hash gave Mint four rules:

1. Watch trends, not single days. One day's netflow is noise. Weeks of consistent flows matter more.
2. Investigate spikes. Check the addresses involved before drawing conclusions (Chapter 2).
3. Compare platforms. If two platforms show very different reserves, their labels differ.
4. Combine with other data. Exchange flows are more meaningful alongside price structure (Module 4), holder behaviour (Chapters 5 and 6), and derivatives data (Module 4, Chapter 15).

3.9 Try it yourself

Find a chart of Bitcoin exchange reserves on an analytics platform, covering the past two years. Describe the overall trend. Then find the largest single-day inflow and outflow in that period, and try to identify what caused them, using news and the addresses involved.

Finally, find the same chart on a second platform and compare their numbers.

Key takeaways from this chapter

1. Coins usually need to move to exchanges to be sold, so exchange flows hint at intent.
2. Inflows suggest potential selling pressure; outflows suggest potential accumulation; reserves show readily available supply.
3. Inflows can also be collateral, custody, OTC trades, or internal transfers.
4. Outflows can also be ETF custody, DeFi use, wallet migrations, or moves between exchanges.
5. ETFs, self-custody trends, and Layer 2 growth have changed what exchange reserves mean over time.
6. Combine crypto and stablecoin exchange flows for a fuller picture.
7. Watch trends, investigate spikes, compare platforms, and combine with other evidence.