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Crypto and DeFi · Altcoins and Narratives

The BTC dominance index

Explain what BTC dominance is, how to read the chart, and what it implies for altcoin behavior.

3 min read+25 XPLesson 26 of 79
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Crypto and DeFi

Altcoins and Narratives

Lesson 26 of 7933%
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Lesson 26 of 79Crypto and DeFiAltcoins and Narratives

Today's tiny win: make one idea click.

Explain what BTC dominance is, how to read the chart, and what it implies for altcoin behavior.

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Bitcoin's slice of the pie

BTC dominance, usually written as BTC.D on charts, is the percentage of the entire crypto market value that belongs to Bitcoin. If the total crypto market is worth, say, $3 trillion and Bitcoin alone accounts for $1.5 trillion, then BTC dominance is 50 percent. Traders watch the BTC.D chart almost as often as they watch BTC itself, because it tells you something the BTC price alone cannot — where capital is flowing inside the crypto ecosystem.

Wick checks a calculator showing 50% because $1.5 trillion of Bitcoin out of a $3 trillion crypto market is half, showing what the BTC.D number means.$1.5T BTC / $3T total =50%50%
Wick saysBTC dominance is Bitcoin's share of all crypto value, like $1.5T out of $3T is 50%.

Here is the key idea. BTC.D rising means Bitcoin's slice of the pie is growing. Capital is flowing toward BTC and away from alts, even if the alts are still up in dollar terms. BTC.D falling means Bitcoin's slice is shrinking. Capital is rotating out of BTC and into the rest of the market. That second condition is what gets called alt season. But the direction of BTC.D alone is not enough. You also need to know what the total market cap is doing.

Wick compares two cards: BTC.D up with total cap down means fear and bleeding alts, BTC.D down with total cap up is the classic alt setup, showing why both charts matter.FearBTC.D up, totalcap down: altsbleedAlt setupBTC.D down,total cap up:money rotates
Wick saysRead BTC dominance with total market cap, because together they show the market's mood.

There are four scenarios worth keeping in your head. One — BTC.D up, total cap up. Bitcoin is leading the market higher. Alts may still gain dollars but lose share. This is common in early cycle moves. Two — BTC.D up, total cap down. A defensive market. Capital is hiding in BTC, alts are bleeding. Three — BTC.D down, total cap up. The setup most alt traders pray for. Money is rotating from BTC into the broader market. Four — BTC.D down, total cap down. Risk is leaving crypto entirely, with alts dropping faster than BTC. Each scenario implies a very different game plan.

Wick writes a 30-second check in his notebook: BTC.D daily trend, TOTAL chart trend, name the scenario, showing a quick habit for reading market context.30-second checkBTC.D daily: trend?TOTAL chart: trend?Name the scenario
Wick saysEach time you sit down, check BTC.D and TOTAL to see what kind of market you are in.

A practical habit. Pull up BTC.D on a daily chart whenever you sit down. Notice whether it is trending up, trending down, or stuck in a range. Then pull up the total crypto market cap chart (TOTAL is the usual ticker) and do the same. The combination tells you, in 30 seconds, what kind of market you are working in. That context shapes everything downstream — which alts you focus on, how aggressively you size, and whether you should even be trading alts at all this week.

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1. What does BTC dominance measure?

2. Which combination is the textbook alt-season setup?

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