Reading a Crypto Price Chart and Understanding Market Cap, Supply, and Dominance

Every crypto data page shows a cluster of numbers — price, market cap, circulating supply, dominance — that can be easy to glance past without fully understanding what each one actually measures. This guide walks through the basics of reading a price chart and interpreting the supply and market-cap figures that sit next to it.

The basics of a candlestick chart

Most crypto price charts use candlesticks, a compact way of showing four data points for a given time period (a minute, hour, day, or longer): the opening price, closing price, and the highest and lowest prices reached during that period. A candlestick’s body shows the range between open and close (typically colored differently depending on whether price rose or fell over that period), while thin lines above and below, called wicks or shadows, show the full high-low range. Shorter timeframes show more granular, noisier price action; longer timeframes smooth that noise out but can obscure short-term detail.

Volume: the activity behind the price move

Trading volume, usually shown as bars beneath the price chart, measures how much of an asset changed hands during each time period. A price move on high volume generally reflects broader participation and conviction behind that move; a price move on unusually low volume can be more fragile and prone to reversing, since it may reflect a small number of trades moving price in a thin market. Volume is a useful piece of context, not a standalone signal, and should be read alongside price action rather than in isolation.

Market cap: price times supply, not “the size of the money invested”

Market capitalization is calculated as an asset’s current price multiplied by its circulating supply. It’s a useful, standardized way to compare the relative size of different crypto assets, but it’s a common misconception to treat market cap as the total dollar amount actually invested in an asset; it’s a real-time snapshot valuation based on the last traded price, and because that last price often reflects a relatively small fraction of total supply actually trading at any moment, market cap can shift substantially on trading volume that’s small relative to the total figure, especially for smaller, less liquid assets.

Circulating, total, and max supply: three different numbers

Circulating supply is the amount of an asset currently available and (in theory) tradeable in the market. Total supply includes coins that have been created but may not all be circulating yet, such as tokens locked in a vesting schedule or held in a project treasury. Max supply, when it exists, is the hard cap on how many units can ever be created — Bitcoin’s is 21 million, while many other assets have no fixed max supply at all, as covered in our Ethereum guide. These three numbers can diverge substantially, and conflating them is a common source of confusion when comparing assets.

Fully diluted valuation: a useful, and easily misread, number

Fully diluted valuation (FDV) is calculated using an asset’s max (or total) supply rather than its circulating supply, showing what market cap would be if every unit that will ever exist were already circulating at the current price. A large gap between market cap and FDV can signal significant future dilution as locked or unissued tokens enter circulation over time, which can create ongoing sell pressure independent of demand. Comparing FDV, not just circulating market cap, across assets can reveal meaningfully different risk profiles that a market-cap-only comparison would miss.

Dominance: market share, not a price prediction

Bitcoin dominance (often shown as “BTC.D”) measures Bitcoin’s market cap as a percentage of the total crypto market’s combined market cap, and the same metric can be calculated for any asset relative to the broader market. Rising dominance means an asset’s market cap is growing faster (or shrinking slower) than the rest of the market combined; falling dominance means the opposite. It’s a relative measure of market share, not an indicator of an asset’s own price direction in isolation, since dominance can rise even while an asset’s price falls, if the rest of the market falls faster.

Support, resistance, and why chart patterns aren’t a guarantee

You’ll frequently see chart commentary referencing “support” (a price level where buying pressure has historically emerged) and “resistance” (a level where selling pressure has historically emerged). These are descriptive observations about past price behavior at certain levels, reflecting the fact that many traders watch the same visible levels and react to them, which can become somewhat self-reinforcing. They are not guarantees that price will behave the same way at that level again; a level that has “held” multiple times in the past can still break decisively, and treating any chart pattern as a reliable predictor rather than a description of past behavior is a common and costly mistake.

Why comparing raw supply numbers across assets can mislead

An asset with a circulating supply in the billions and an asset with a circulating supply in the tens of millions aren’t more or less valuable because of that supply figure alone; what matters is the combination of price and supply together, which is exactly what market cap is designed to capture. Judging an asset as “cheap” purely because its per-unit price is a few cents, without considering its supply and resulting market cap, is one of the most common misreadings of these numbers among newer market participants.

Where to check these numbers for a specific asset

For current price, market cap, and supply data on specific assets, see our live markets page and individual coin pages like Bitcoin and Ethereum, rather than any figure in this guide, since all of these numbers change continuously and any specific value would be stale by the time you read it.

Frequently asked questions

Is a higher market cap always better than a lower one?

Not necessarily “better” in any absolute sense — it mainly reflects relative size within the crypto market at that moment. A higher market cap generally correlates with deeper liquidity and, historically, somewhat lower volatility than very small-cap assets, but it doesn’t reflect quality, technology, or future prospects on its own.

Why does an asset’s price sometimes look high or low compared to another asset with a similar market cap?

Price per unit depends entirely on how many units exist; an asset with a huge circulating supply will have a much lower per-unit price than one with a small supply, even at an identical total market cap. Comparing raw prices across different assets without accounting for supply is a common and misleading mistake.

Does rising Bitcoin dominance mean Bitcoin’s price is going up?

Not necessarily. Dominance is a relative measure; it can rise even if Bitcoin’s price is falling, as long as the rest of the market is falling faster, so it should be read as a market-share metric rather than a direct price signal.