Open any coin's page and the first big number you see is its market cap. New investors treat it like a price tag, the total value of the project. The trouble is that a second number sitting right next to it, the FDV, often tells a very different story, and the gap between the two is where a lot of people quietly lose money. This guide explains what each number means, why a coin that looks cheap can be one of the most expensive things on the market, and how to spot the trap before you buy.
Why market cap fools people
A coin trading at one cent feels cheaper than a coin trading at fifty thousand dollars. That instinct is wrong, and it is the single most expensive mistake new traders make. Price alone tells you almost nothing, because a project can issue a hundred coins or a hundred billion of them. What matters is how many coins exist and how many are still waiting to be released. Market cap and FDV are the two numbers that answer that, and reading them together is the difference between buying a fair deal and walking into a slow sell-off.
What market cap really measures
Market cap is simple. It is the current price multiplied by the number of coins actually in circulation right now.
So a coin at $2 with 50 million coins circulating has a $100 million market cap. This is the number that lets you compare projects fairly. A $100 million coin is a $100 million coin whether its price is $0.01 or $1,000. It also tells you, roughly, how much new money would have to flow in to move the price. Doubling a $100 million coin is far easier than doubling a $100 billion one.
What FDV measures, and the hidden supply
FDV stands for fully diluted valuation. It asks a different question: what would this project be worth if every single coin that will ever exist were already trading?
Here is where it gets important. Many projects launch with only a small slice of their total supply in circulation. The rest is locked, held by the team, early investors, and the foundation, and it is released gradually over months or years. So a coin can have a $100 million market cap but a $2 billion FDV. That gap is not a detail. It is roughly 1.9 billion dollars worth of coins that do not trade yet but will, and every one of them is future supply that can be sold.
Market cap is what a project is worth today. FDV is what it would be worth if everyone's locked coins were already on the table. The space between them is supply that has not arrived yet.
A worked example
Say a new token, call it NEW, launches at $1. The team puts 5% of the supply into circulation and keeps 95% locked.
- Circulating supply: 50 million coins
- Maximum supply: 1 billion coins
- Market cap: $50 million
- FDV: $1 billion
At launch, only 50 million coins are available, so even modest buying pushes the price up fast. NEW pumps to $3. Now its market cap is $150 million and its FDV is $3 billion, the size of a serious, established project, except NEW has no real users yet. Six months later the first unlock arrives and another 100 million coins enter the market. Suddenly there are three times as many coins for sale, the early backers who paid a fraction of a cent start taking profit, and the price slides. The buyers who showed up at $3 are now underwater. None of this was bad luck. It was printed in the supply schedule the whole time.
Token unlocks: the slow leak
That locked supply does not stay locked. It is released on a schedule called a vesting or unlock calendar, and it is one of the most underrated forces in crypto pricing. Binance Research estimated that roughly $155 billion worth of tokens are due to unlock between 2024 and 2030. Without an equal wave of new buyers, all of that supply pushes prices down.
The effect is harsh for newer coins. Tokens launched in 2024 had an average market cap to FDV ratio of around 12%, meaning nearly 90% of their supply was still waiting to hit the market. More than 80% of the coins newly listed on Binance in that stretch went on to lose value. The pattern is so reliable that traders gave the structure a name: low float, high FDV. A low float (few coins circulating) creates scarcity and a price pump, and the high FDV is the bill that comes due as the coins unlock.
Most memecoins launch with all of their coins already circulating, so their market cap and FDV are nearly the same. No locked supply means no future unlock dumps, which is one quiet reason they have often held up better than fancier tokens with huge hidden supply.
Reading the cap to FDV ratio
You do not need to do the math by hand. Most data sites show both numbers, and the ratio between them is the quick tell.
- Ratio near 1: almost all coins are already circulating. Little hidden supply, few surprises. Bitcoin and most memecoins sit here.
- Ratio around 0.5: roughly half the supply is still locked. Manageable, but check the unlock schedule.
- Ratio below 0.2: most of the supply has not been released yet. The price you see rests on a tiny float, and a wall of future supply is coming.
For context, across the top 300 coins the average ratio is about 0.73. The lowest-float large coins, projects like Worldcoin and Starknet, have sat near 0.02 to 0.07, meaning more than 90% of their eventual supply was still to come. That does not make them bad coins, but it does mean the headline price was resting on very little actual float.
When low float is fine, and when it is a trap
Low float is not automatically a scam. What matters is what backs the high FDV.
- The project has a real product and real users.
- It earns fees or revenue that can absorb new supply.
- Unlocks are slow and linear, not sudden cliffs.
- Coins like Arbitrum and Uniswap launched low float with real adoption behind them.
- The valuation rests on hype and a story, not usage.
- There is little or no revenue to soak up selling.
- A big cliff unlock is coming where early backers can exit.
- The coin is all over social media with promises and no product.
The question to ask is simple: is this FDV backed by something real, or just by a slide deck and a low float?
Before you buy: a two-minute check
Three quick checks will save you from most of these situations.
- Compare market cap and FDV. If FDV is many times the market cap, a lot of supply is still locked.
- Look up the unlock schedule. Sites that track vesting show when the next big release lands and how large it is. A cliff in the next month or two is a warning.
- Ask what the FDV is buying. Real revenue and users can justify a high valuation. Hype cannot.
And one habit that ties back to what we do here: watch the volume around unlock dates. Selling pressure tends to show up as a shift in flow before the price fully breaks, which is exactly the kind of move a volume dashboard is built to catch.
See the selling before the price breaks
CryptoFlow tracks live buying and selling volume across five major exchanges, so a wave of unlock supply shows up in the flow before it shows up on the chart.
Open the Dashboard →The bottom line
Market cap tells you what a project is worth today, based on the coins that actually trade. FDV tells you what it would be worth if every coin existed, and the gap between them is future supply waiting to be sold. A low price does not make a coin cheap, and a small market cap next to a giant FDV is not a bargain, it is a reason to read the supply schedule before you buy. Learn to read both numbers together, and you will sidestep the trap that catches most newcomers.