Crypto Market Cap: What It Measures and What It Hides

Market capitalisation is the simplest number in crypto: circulating supply multiplied by the current price. It is useful because it makes coins comparable. A token at $0.00002 and a coin at $90,000 tell you nothing next to each other until you multiply each by how many units exist.

The trap is treating it as money that went in. It is not. Cap is a valuation at the margin: the last trade repriced every existing unit at once, including the ones nobody would buy at that level. A coin with a small free float can carry a very large cap on very little real buying, and that cap will not survive an attempt to sell into it.

A worked example makes the point. Suppose a token has one billion units, but only fifty million trade freely and the rest are locked with the team or a treasury. A single buyer pushing the traded price from one dollar to two has added fifty million dollars of value to the float and a billion dollars to the headline cap. Nothing about the second number was funded.

Two companions make the picture honest. Fully diluted valuation applies the same maths to the maximum supply, showing what today's price implies once every token exists. Volume relative to cap shows whether the market actually trades the thing or merely quotes it: a large cap with daily volume below one percent of it is a price that has not been tested recently.

Unlock schedules turn that arithmetic into a calendar. When locked supply becomes tradable in scheduled batches, the free float grows on known dates, and a price that was set by a small float now has to hold against a larger one. This is why two coins with identical caps can behave completely differently over a quarter.

Use cap for what it is good at — sorting and comparing things that are otherwise unlike — and then look underneath it. Volume relative to cap, the number of exchanges listing the coin, the spread on those books and the unlock calendar describe whether the size is real. Nothing here is investment advice.