Market overview
The Market Data hub opens with six readings that describe the market as a whole, a set of module cards, and a daily summary. This page explains the six readings and the rules every module on the section obeys.
Every figure in this section describes what has already happened. Nothing here is a forecast, and nothing here is a recommendation to buy or sell anything.
The six readings
| Reading | What it is |
|---|---|
| Total market cap | The capitalisation of every listed crypto asset, from our market-data provider's global endpoint — not a sum of the hundred assets this section measures. |
| 24h volume | Total traded value across the same whole market, over the last 24 hours. |
| BTC dominance | Bitcoin's share of total market cap. |
| ETH dominance | Ether's share. |
| Stablecoin dominance | The combined share of assets pegged to a currency. |
| Altcap ex-BTC | Total market cap with Bitcoin's share removed. |
These six describe the entire market, not the hundred assets the boards measure. That distinction matters on a day the heatmap is green and the total cap is down: the heatmap measures a defined hundred, and the total includes thousands of assets outside it.
How the change beside each reading is measured
Each reading shows a change against the last day we recorded, not against a rolling 24 hours. We record one row per day; on any ordinary day the anchor is yesterday and the card reads "24h". When a day's recording was missed the window really is longer, and the card names the date it is comparing against instead.
Units are not assumed by the page — the server states them:
- A money reading changes by a percentage.
- A dominance is already a percentage, so it changes by percentage points. Bitcoin going from 58.0% to 58.4% moved 0.4 points, not 0.4 percent, and rendering it the second way would understate the rotation by a third.
The rules every module here follows
These are worth knowing once, because they explain most of what you will see.
Missing is a dash, never a zero
If we could not measure something, the figure is absent and the page shows "—". It is never filled in with a zero, an average, or an interpolated value. A total volume of zero across a whole market is not a market state — it is a provider with no figure, and we render it as one.
Every aggregate declares what it was drawn from
A percentage over a partial sample says so: "68 of 94". Below half coverage the figure is withheld entirely rather than shown weakly, because a percentage over twelve assets reads exactly like one over ninety-four.
A figure quoted twice comes from one computation
The sector table under the heatmap and the sector table on the breadth page are the same table, from the same calculation. The summary's breadth sentence and the breadth page's counts are the same numbers. Nothing on this section is computed in two places.
History is recorded forward, never reconstructed
We are the only source of our own history for dominance and for the overview series, so those charts begin on the day we started recording. A range with too few days is offered disabled, with the date it becomes available — never padded, never interpolated, and never silently shortened. Every history response states its own span.
Classifications are descriptions
"Risk-on", "Overbought", "Extreme greed" describe a measured state against a published threshold, and every threshold is written down in these pages. None of them is advice.
Where the numbers come from
Each page carries a credit line at its foot naming every feed it drew on. The section reads price, capitalisation and volume from a market-data provider; candle history for the calculated measures from a spot exchange; the sentiment index from its publisher; the Bitcoin block height from a public chain API; and ETF flows from records an operator imports.
When something is behind
Every module serves its last good reading with a banner and a date rather than going blank, and a module that has never been able to read says so rather than showing an empty grid. A dated figure is honest; a blank page is not, and a fabricated one is worse than either.