Three gauges that read the crypto market: dominance, sentiment, breadth

Crypto produces more indicators than any market in history, and most of them are noise wearing a chart. Three survive professional use because each measures something structurally different: where the capital sits (Bitcoin dominance), what the crowd feels (Fear & Greed) and how broad the move runs (altcoin breadth). None works alone. Together they form a read that is hard to fool.

Dominance: the capital gauge

BTC.D divides Bitcoin’s market cap by the whole market’s. Its power is that it cancels direction out: the market can crash or rally, and dominance still tells you whether Bitcoin or the alts took the flow. Rising dominance in a falling market is capitulation out of risk; rising dominance in a rising market is a BTC-led advance that has not yet trusted the long tail. The falling-dominance variants mark rotation into risk — the precondition for every altseason on record.

Its failure mode is composition. Stablecoins and new listings dilute the denominator, so a multi-month dominance drift can reflect issuance rather than rotation. Cross-check big moves against the global cap dashboard before treating them as signal.

Sentiment: the emotion gauge

The Fear & Greed Index compresses volatility, volume, social activity, dominance and search interest into a 0–100 score. Its edge is asymmetry: panic prints faster and deeper than euphoria, so single-digit readings have historically clustered within weeks of durable lows — the November 2022 FTX collapse being the canonical example. Extreme greed is looser as a timing tool; strong trends can pin the gauge above 80 while prices double again.

Treat it as a permission filter, not a trigger: extreme fear grants permission to start looking for entries, extreme greed grants permission to start trimming. The gauge’s 90-day history strip matters more than today’s print — persistence distinguishes regime from noise.

Breadth: the participation gauge

The Altcoin Season Index counts how many top-50 coins beat BTC over the trailing window. It answers the question dominance blurs: is outperformance concentrated in three lucky tickets or spread across the board? Readings above 75 define altseason; below 25, Bitcoin season. Because every coin votes equally, breadth catches broad mid-cap rallies that mega-cap-weighted dominance can hide entirely.

The combined read, in practice

The classic sequence of a full cycle: dominance rises with fear high (accumulation into BTC) → dominance peaks while sentiment normalizes (BTC-led advance) → dominance rolls over as greed builds and breadth explodes (altseason) → all three extremes coincide (distribution). No cycle follows the script exactly, but disagreements between the gauges are themselves information — greed with collapsing breadth, for example, has preceded most local tops since 2021.

All three gauges live on this site, free and account-less. Check them in the same order the market moves: capital, then emotion, then breadth — and let the disagreements do the teaching.