Bitcoin Dominance Indicator Development
Bitcoin Dominance is the share of Bitcoin's market capitalization in the total crypto market capitalization. It is one of the basic macro-indicators of market cyclicity: an increase in dominance often coincides with "flight to quality" or a bear market for altcoins, a decrease — with altseason.
What the Indicator Displays
Simplest calculation: BTC Market Cap / Total Crypto Market Cap × 100%. Data is available through CoinGecko API (/global), CoinMarketCap API (/global-metrics/quotes/latest) or own calculation from aggregated asset data.
Extended dominance variants:
- BTC Dominance (excl. stablecoins) — excludes USDT, USDC, DAI from total capitalization. Gives a cleaner picture.
- ETH Dominance — similar indicator for Ethereum.
- Altcoin Season Index — derivative indicator: if 75 of top 100 altcoins outperformed BTC over the last 90 days — this is altseason.
The indicator is implemented as a separate panel in the trading dashboard or as an overlay on the BTC price chart. Data is updated every 5–15 minutes through polling CoinGecko/CMC API.







