BTC Dominance
Bitcoin's share of total cryptocurrency market capitalization. Rising dominance marks risk-off rotation into BTC; falling dominance indicates altcoin season. A foundational macro indicator.
What is it?
BTC Dominance is the ratio of Bitcoin's market capitalization (price × circulating supply) to the total market cap of all cryptocurrencies combined. Historically, Bitcoin represented 100% of the market in 2009. With the emergence of altcoins (Ethereum in 2015, DeFi in 2020, memecoins), BTC dominance has structurally declined. It typically oscillates between 40% (altcoin seasons) and 70% (flights to quality). It's a thermometer of risk appetite in the crypto ecosystem: when investors seek safety, they flee to BTC (dominance rises); when euphoria dominates, capital flows to riskier altcoins (dominance falls).
How to read
Dominance > 65%: flight to quality, altcoins underperform BTC - conservative environment. 55-65%: neutral zone, BTC and altcoins coexist. 50-55%: start of rotation toward altcoins. < 50%: altcoin season, speculative capital flowing to small caps. The TREND matters more than the absolute level - rapidly rising dominance indicates fear (even at 55%), rapidly falling dominance indicates greed.
Key zones
BTC dominance reached a historical minimum of ~32% in January 2018 (ICO mania peak), another trough of ~38% in November 2021 (altcoin peak). Notable highs include ~72% in September 2019 (pre-DeFi summer). The 55-65% zone has historically been associated with a neutral-high regime reflecting a structural preference for BTC in uncertain macro environments.
What to observe
Compare BTC.D direction with BTC price: if BTC rises AND dominance rises, it's a 'BTC only' move (altcoins left behind). If BTC rises and dominance falls, capital is also flowing to altcoins - sign of broad confidence. If BTC falls and dominance rises, it's altcoin capitulation (flight to BTC). If both fall, it's a generalized bear market.
Historical context
BTC Dominance followed a structural descending arc from 2009 (100%) to 2018 (~32%), then rebounded. Each altcoin cycle produced a higher dominance trough than the previous one (32% → 38% → ???), suggesting Bitcoin is consolidating its 'store of value' role over time. The introduction of spot BTC ETFs in January 2024 accelerated the dominance uptrend, as institutional capital primarily targets Bitcoin.
Expert notes
BTC Dominance is skewed by stablecoins: USDT + USDC represent a substantial share of total market cap that isn't a 'crypto investment' but capital waiting on the sidelines. Some analysts use a 'stablecoin-adjusted dominance' excluding stablecoins, yielding values ~5-8 points higher. Additionally, 'dead' tokens (abandoned projects still listed) artificially inflate the denominator, underestimating true BTC dominance.
Common mistakes to avoid
'BTC Dominance falling = BTC is weak' is FALSE. Dominance can fall during a bull market if altcoins rise faster than BTC. The reverse is also true: rising dominance doesn't mean BTC is rising - it can rise during a crash if altcoins crash harder. Always look at dominance + BTC price together, never in isolation.
Programmatic access
REST API
curl -sS \
'https://api.trinityinsights.io/api/v1/onchain/btc-dominance/history?days=90' \
-H 'X-API-Key: $TRINITY_API_KEY'MCP server
{
"tool": "get_chart_value",
"metric_id": "btc-dominance",
"timeframe": "1y"
}Required tier: free. See the pricing grid for the tier list and the MCP documentation for multi-client configuration.
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Institutional disclaimer
Trinity Insights is an educational and analytical tool. The metric above does not constitute investment advice. Trinity Insights is not a Crypto-Asset Service Provider (CASP) registered under MiCA Regulation (EU) 2023/1114. See the full disclaimer.