BTC Dominance Index
Index showing Bitcoin's share of total crypto market.
BTC.D = MarketCap(BTC)/MarketCap(All). Pattern: post-crash rises (flight to safety), flat in accumulation, BTC pumps first (rises), capital rotates to alts (falls), memecoin mania (cycle min).
In plain words
Short for Bitcoin Dominance, see BTC.D. Tells you what % of the total crypto market value is Bitcoin alone. The key indicator of capital rotation between BTC and alts: rising = flight to BTC, falling = altseason.
Example
Sep 2019: 71%. May 2021: 39%. Jun 2022: 47%. Nov 2024: 58%. May 2025: 64%.
Also known as: BTC.D, Bitcoin Dominance