Bitcoin dominance chart (BTC.D): BTC's share of total crypto market cap since May 2013, with the 40% alt-euphoria threshold used as a cycle-peak signal. History every 3 days through early September 2026, daily since then from Coinfuty's tracked market cap.
Left axis: BTC price (log). Right axis: BTC market cap as % of total crypto market cap. History since May 2013 at 3-day steps (whole market); daily from 8 Sep 2026 on the market cap Coinfuty tracks (~2–3 pts higher, so a small step at the seam).
dominance = BTC market cap / Σ market cap of active crypto assets tracked by Coinfuty
Bitcoin dominance is BTC's share of total crypto market capitalisation. Coinfuty computes it hourly from the market caps of the active crypto assets in its own universe (stocks, indices and commodities traded as perpetuals are excluded), so the denominator is a little smaller than site-wide figures that include every token. The daily series accumulates from September 2026.
Dominance falls when capital rotates from Bitcoin into altcoins — the late-cycle phase. In 2017–18 and 2021 the drop below roughly 40% coincided with the final weeks of the bull market, which is why a reading at or below 40% counts as a peak signal here. Rising dominance in a downturn means alts are being sold harder than BTC.
65.1% of Coinfuty's tracked crypto market cap as of Oct 19, 2026.
Capital is rotating from Bitcoin into altcoins. Early in a cycle that is healthy breadth; late in a cycle, when dominance drops toward 40%, it has marked the speculative final phase before a market-wide top.
The denominator is the market cap of the active crypto assets Coinfuty tracks (futures-listed coins, excluding tokenised stocks and commodities), which is smaller than an all-tokens total — so the level runs a few points higher.
Coinfuty's own daily series starts in September 2026 and grows every day; a long-history dominance chart from 2013 is planned and will replace the backfill on this page.
Coinfuty computes every series on this page from daily BTC close prices and public constants — the Bitcoin halving schedule, block subsidy and published regression coefficients. Values refresh nightly (00:20 UTC) and the current day is patched hourly. These are historical, backward-looking indicators; nothing here is investment advice.