What Is an Altcoin? Bitcoin Links, Risks and Market-Cap Categories
Altcoin is a collective term for every cryptocurrency other than Bitcoin. With tens of thousands of varieties and widely differing volatility, beginners should establish the basics first. Here are the definition, relationship with Bitcoin, risks and market-cap categories.
What is an altcoin?
Altcoin combines “alternative” and “coin” and refers to all cryptocurrencies except Bitcoin. After Bitcoin appeared in 2009, many coins emerged to address its limitations or add new functions. They became known collectively as altcoins.
For example, Ethereum (ETH) introduced smart-contract functionality, while XRP was developed for international transfers. Market-information sites list tens of thousands of coins, but only some trade actively.
The relationship between Bitcoin and altcoins
Altcoins compete with Bitcoin while often remaining closely linked to its price movements. Bitcoin's share of the overall market is called Bitcoin dominance, commonly described as moving around 40–60%.
- When Bitcoin rises: Altcoins often follow, although they can underperform when money concentrates in Bitcoin.
- When Bitcoin moves sideways or falls: Altcoin declines are often much larger than Bitcoin's.
Altcoins are therefore heavily influenced by Bitcoin as the market's reference asset. Many investors check Bitcoin's price and whether it is trending or ranging before examining altcoins.
High volatility and risk
Altcoins have smaller market capitalizations and lower trading volume than Bitcoin, producing substantial volatility. Daily moves of ±20–30% are not unusual for some assets. Coins that surge quickly can collapse just as fast.
Common risks include:
- Insufficient liquidity: No buyer is available when you want to sell, preventing an exit at a reasonable price.
- Project abandonment or rug pulls: Developers take the funds and disappear.
- Delisting: Exchange trading is suspended, closing off an exit route.
Greater volatility means greater potential losses as well as opportunities. No coin guarantees profits. Establish stop-loss rules and capital-management principles before investing.
Altcoin categories by market capitalization
Altcoins are often grouped by market capitalization, calculated as coin price × supply. Larger capitalization tends to mean relatively greater stability; smaller capitalization usually brings greater volatility and risk.
| Category | Approximate market capitalization | Characteristics |
|---|---|---|
| Large-cap | Several trillion KRW or more | Established projects such as Ethereum; still volatile but relatively stable |
| Mid-cap | Hundreds of billions to trillions of KRW | Growth potential and risk coexist; sensitive to news |
| Small-cap and obscure coins | Tens of billions of KRW or less | Extreme swings and the greatest liquidity and fraud risks |
Large-cap and obscure altcoins have very different risk levels. Beginners can learn with small amounts in coins with larger market caps and sufficient volume, while checking basics such as candlesticks, support and resistance, and volume.
Summary: Altcoins are all coins other than Bitcoin. Their movements are linked to Bitcoin, but their volatility and risks are generally greater. Start by understanding the concepts and categories, then proceed carefully within what you can afford to lose.
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