Started at 1,000. Stablecoins and gold tokens excluded. Members are the ten largest coins at each update, and the divisor adjusts when they change so the line stays continuous.
Countdown
Bitcoin halving
Every 210,000 blocks, the reward for mining new Bitcoin is cut in half.
Calculators for prices, market caps, history and risk, using live data.
History
Past investment
What money put into a coin on a past date is worth today.
Your investmentSame money in BitcoinMoney put in
Steady buying
DCA simulator
Buying a fixed amount on a schedule, compared with putting it all in on day one.
Steady buyingAll on day oneMoney put in
Reality check
Price target
What a target price would mean for a coin's market cap.
Converter
Convert
Any coin to dollars or to another coin, at live prices.
Head to head
Compare coins
Side-by-side price, size, supply and performance.
Market cap comparison
What if
The price a coin would have with another coin's market cap.
Flippening watch
Closest races
Neighbours nearest to swapping rank (stablecoins excluded).
Dominance
Market share
Share of total crypto market cap.
Profit & loss
Return check
What a past buy is worth at today's price.
Risk
Position size
How much to buy so a stop-out loses only what you choose.
A stop-loss isn't guaranteed. Gaps and slippage can fill past your stop and make the loss bigger.
Supply
Dilution check
Circulating vs. maximum supply, and the cap if every coin existed.
Investing
Average cost
Your weighted average price across several buys.
Investing
Break-even
The selling price that gets your money back after fees.
Risk
Comeback
The gain needed to recover from a drop.
Start
After drop
Investing
Rebalancer
Trades needed to get back to your target mix.
Coin
Now
Target %
Trade
Today's crypto prices by market cap
Should you keep crypto on an exchange or in your own wallet?
When your coins sit on an exchange, you don't really hold coins. You hold the exchange's promise to give them back.
Usually that promise is kept. When it isn't, as FTX's customers found in 2022, the wait can last years.
Two ways to hold
On an exchange you trust the company. In your own wallet you trust yourself. Many people use both, an exchange to trade and a wallet to hold.
When your coins sit on an exchange, the exchange controls the keys and you hold a promise to be paid back. That's convenient for trading, but if the exchange fails, is hacked or freezes withdrawals, you may not get your coins back quickly or at all. FTX's collapse in 2022 left customers waiting years for repayment.
With self-custody, your coins are in a wallet whose keys only you control, often written down as a recovery phrase. No company can freeze them, but no company can rescue you either if you lose the phrase or send to the wrong address.
Many people use both, with an exchange for buying and selling, and a wallet they control for long-term holdings. Hardware wallets keep keys offline, which protects them from most online attacks.
Questions to ask an exchange
Is it licensed where you live? Does it publish proof of reserves, and does that include its liabilities? Has it had withdrawal freezes before? Does it support two-factor authentication with an app or key rather than text messages?
None of these make an exchange risk-free, but they separate the careful from the careless.
Moving to self-custody
Set up the wallet and back up the recovery phrase first. Then send a small test amount, check it arrives, and only then send the rest.
Always copy addresses by pasting and check the first and last few characters, because some malware swaps the address on your clipboard.
Reading a proof of reserves report
Proof of reserves only tells half the story. Coverage is reserves divided by what the exchange owes customers, and it needs to be at least 100%.
After FTX failed in November 2022, many large exchanges began publishing proof of reserves, meaning evidence usually wallet addresses or an auditor's attestation, that they hold certain amounts of each coin. That is useful, but on its own it answers only half the question. An exchange can show 10,000 bitcoin in its wallets and still be short if customers are owed 12,000.
The figure that matters is coverage, which is reserves divided by customer liabilities, coin by coin. In the example, 10,000 divided by 12,000 is about 83%, so if every customer asked for their bitcoin at once, roughly one in six would go unpaid. Good reports show a ratio of 100% or more for each major asset, and many use a Merkle tree so you can check that your own balance was counted.
Watch for gaps. A report is a snapshot of one day, so coins could be borrowed for the photo and returned the next morning. Liabilities that sit off the customer ledger, such as loans the exchange has taken, may not be included. And an attestation is not a full audit. Treat a strong report as one good sign among several, not a guarantee.
What your recovery phrase actually controls
The phrase is the wallet. Whoever has those words can rebuild every account it controls, on any device, without your phone or password.
Most self-custody wallets follow a standard called BIP-39. The wallet picks a random number and encodes it as 12 or 24 words from a fixed list of 2,048 English words. Every private key the wallet will ever use is derived from that one phrase, in a fixed order, so the same words always produce the same addresses.
That has two practical consequences. First, one backup covers everything, including your Bitcoin addresses, your Ethereum accounts, the tokens on each chain, and any new accounts you add later. If your phone is lost, you can type the phrase into another compatible wallet app and see the same balances, because the coins never lived on the phone. They are recorded on the blockchain, and the phrase proves you control them.
Second, anyone else who gets those words has exactly the same power, from anywhere in the world, without your device or password. That is why the phrase should live on paper or metal stored somewhere safe, never in a photo, email, cloud note or password field on a website. Some wallets let you add an extra passphrase as a 25th word, which protects you if the written words are found but adds one more thing you must not lose.
Key terms
Custody
Who holds the keys that control the coins.
Proof of reserves
An exchange showing it holds customer assets on-chain.
Withdrawal freeze
An exchange stopping customers from taking coins out.
Cold storage
Keys kept offline.
Neither choice is safe by default
Whether an exchange is safe. Proof of reserves shows assets, not the debts behind them.
Whether you're safer alone. Self-custody removes the company and adds your own mistakes.
What people get wrong
"Proof of reserves" from an exchange doesn't prove it has no hidden debts. It's a partial check.
Self-custody isn't automatically safer for everyone. Losing a recovery phrase is a common way people lose coins for good.
Why it matters
Where your coins are held decides who you're trusting, and it's one of the few risks in crypto that you control.
Common questions
What does "not your keys, not your coins" mean?
It's shorthand for the idea that if someone else controls the keys, you depend on them to give you access to your coins.
Is it safe to keep crypto on an exchange?
It can be convenient and reasonably safe on a large, regulated exchange with strong security, but you carry the risk of that company failing, freezing withdrawals or being hacked. Many people keep only what they actively trade on exchanges and move long-term holdings to a wallet they control.
Should I use a hardware wallet?
If you hold an amount you would hate to lose, a hardware wallet is a sensible step. It keeps your keys on a small offline device and asks you to confirm each transaction on its own screen, so malware on your computer can't sign transfers. Buy one directly from the maker, never secondhand.
