Exchange vs Hot Wallet vs Cold Wallet: How Much to Keep
There is no universal ratio. Keep on an exchange only what you are actively trading, keep a small hot wallet for on-chain spending, and put long-term holdings in cold storage. Size each bucket by how often you use it and how long you could cope with it being paused or frozen. No platform or wallet is absolutely safe.
On October 29, 2026, Binance paused withdrawals on several networks after large hot-wallet outflows, calling it a precautionary pause following a “security incident” according to TechCrunch, and the same day Polymarket said a compromised third-party script had abused logged-in user sessions on its international site. Both companies said users would be made whole. Whatever the final details, the episode is a good prompt to ask a question that never goes out of date: how much of your crypto should sit on an exchange, in a hot wallet, and in cold storage?
There is no universal ratio, and anyone giving you one is guessing about your life. What follows is a method you can apply to your own numbers.
Start with what each tier is for
This guide is only about sizing, not about how the wallet types work. If you need a refresher on custodial, hot and cold wallets, read crypto wallet types explained first. Here, each tier is defined by the job its money does:
- Exchange tier: money you will trade or convert to fiat soon.
- Hot wallet tier: money you will use on-chain soon.
- Cold tier: money you will not touch for months.
If a coin has no job in the first two tiers, its default home is the third.
A framework for sizing each bucket
Instead of a fixed percentage, size each bucket with three questions.
| Tier | Sizing question | Stress test | Move the excess to |
|---|---|---|---|
| Exchange | What will I trade or cash out in the next few weeks? | Could I cope if withdrawals paused for weeks? | Cold tier, or a second exchange if still trading |
| Hot wallet | What will I spend or deploy on-chain soon? | Could I cope if this wallet were drained today? | Cold tier |
| Cold | Everything else held for months or years | Is the seed phrase backed up and tested? | Stays put; review on schedule |
Work top-down. Write down a number for the exchange tier from your actual trading plan, then a number for the hot wallet tier from your planned on-chain activity. Run each against its stress test. Whatever fails the test, or has no planned use, moves to the cold tier. The result is a split based on your own activity rather than a percentage borrowed from someone else. For deciding how big your trades should be in the first place, see the position sizing calculator guide.
Keeping each tier at the right size
- Exchange bucket follows activity, not conviction. If you are not trading it, it does not need to be there.
- Split active balances across venues once the amount matters to you, so a single pause does not halt everything. Our futures exchange comparison can help with a shortlist.
- Keep the hot wallet small and refill it. The Polymarket case showed that a logged-in session can be enough for an attacker, so log out of trading sites and revoke old token approvals.
- Read every signature. Wallet drainers rely on approval and delegation prompts that look routine, so give them the same care as a withdrawal.
- Cold storage gets a test transaction first, every time. If you have not set up a device yet, see our hardware wallet guide for beginners.
Whatever amount you keep on an exchange, lock the account down first; our crypto exchange account security checklist lists the settings worth checking.
Where stablecoins fit
Stablecoins are convenient for parking value in any bucket, but they come with issuer control. After the Binance outflows, Tether froze more than 1.567 billion USDT and Circle more than 800 million USDC, according to TechCrunch. Freezes can protect victims, and they also mean an issuer can stop a token from moving. Read what is a stablecoin before putting a large share of your holdings into one.
Before you decide how much to leave on a platform, it helps to check its reserve report yourself. Our guide on how to verify an exchange’s proof of reserves walks through the Merkle tree lookup and what the liability side should show.
How to move funds without new mistakes
Rushing during an incident creates its own losses. Before moving anything:
- Check the platform’s official status or help pages, such as Binance support or the Polymarket help center, not links in DMs.
- Confirm the network on both ends. A token sent on the wrong network can be hard or impossible to recover.
- Send a small test amount, confirm it arrives, then send the rest.
- Save transaction hashes and export your history. The IRS digital assets page explains US reporting.
- If you are defrauded, report it to IC3, and review the CFTC’s customer advisories on digital asset scams. Ignore “recovery services” that charge up front.
The bottom line
No exchange, wallet or platform is absolutely safe, including the ones we track. The goal is not to find a perfect place for your money; it is to avoid having all of it behind a single point of failure. Size the exchange bucket to your trading, keep the hot wallet small, put long-term holdings in cold storage, and review the split on a schedule rather than in a panic.
Frequently asked questions
How much crypto should I keep on an exchange?
Only what you are actively trading or about to sell. A useful test is: if withdrawals on this exchange paused for two weeks, would that amount break your plans? If yes, it is too much for one venue. There is no single correct percentage; it depends on how often you trade.
How much should go in a hot wallet?
Treat a hot wallet like a physical wallet: enough for the on-chain activity you expect in the near term, such as DeFi, payments or prediction markets. Because it is connected to the internet and to sites you sign into, keep it small and refill it from cold storage when needed.
Should everything not being traded go to cold storage?
As a default, yes, but cold storage is not risk-free: you take on the risk of losing the seed phrase or signing a malicious transaction. Only move amounts large enough to be worth the setup, and back up and test your recovery before relying on it.
Should I split funds across more than one exchange?
If you trade regularly, splitting your active balance across two venues means one pause or outage does not freeze your entire strategy. It adds some admin and fee comparison work, so it is most useful once your trading balance is meaningful to you.
Where do stablecoins fit in this split?
Stablecoins can sit in any bucket, but remember that major issuers can freeze tokens. In October 2026 Tether reportedly froze more than 1.567 billion USDT and Circle more than 800 million USDC linked to the Binance incident. That helped contain it, and it also shows issuer control is part of the risk.
How often should I rebalance between the three buckets?
Review it on a schedule, for example monthly, and after any big trade, deposit or platform incident. Move profits you no longer plan to trade from the exchange bucket toward cold storage, using a small test transaction first.
What records should I keep?
Export trade and transfer history from each exchange and wallet regularly. It helps with any reimbursement claim if a platform has an incident, and with tax reporting, which the IRS covers on its digital assets page.