Altcoin
An Altcoin (Alternative Coin) is any cryptocurrency other than Bitcoin.
The term 'Altcoin' is a portmanteau of 'Alternative Coin' and serves as the catch-all classification for the thousands of cryptocurrencies launched after Bitcoin. While Bitcoin remains the 'pristine' store of value and decentralized money, Altcoins represent the decentralized R&D lab of the blockchain industry.
### Taxonomy of Altcoins:
1. Platform Tokens (L1s): The 'Digital Real Estate' of crypto. Chains like Ethereum, Solana, and Avalanche allow others to build apps on top of them. Their value is derived from gas fees and network security.
2. Protocol Tokens (DeFi/L2s): Tokens that govern specific applications (UNI for Uniswap) or scale basic chains (OP for Optimism).
3. Stablecoins: The 'Liquidity Layer.' These are pegged to fiat (USD/EUR) to reduce volatility (USDT, USDC, DAI).
4. Utility Tokens: Assets that provide access to a specific service (e.g., Filecoin for storage).
5. Memecoins: Pure social consensus assets (DOGE, SHIB). Their value is derived from community attention and 'Unit Bias' (the psychological preference for owning millions of 'cheap' coins over a fraction of an 'expensive' one).
### The Altcoin Cycle (Altseason):
Markets typically move in a standard rotation: Bitcoin pumps first (due to safe-haven status), then liquidity flows into 'Blue Chip' Altcoins (Ethereum/Solana), and finally into 'Small Caps' and Memecoins. This final stage is known as 'Altseason,' characterized by rapid, vertical growth across the board, followed by a sharp correction.
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🧒 Explain Like I'm 5
Think of [Bitcoin](/en/terms/bitcoin) as the 'Grandfather' of all crypto. It was the first. Altcoins are like Bitcoin's children and cousins. Some are serious and helpful (like [Ethereum](/en/terms/ethereum), which is like a giant world computer), some are like dollars you can send anywhere safely ([Stablecoins](/en/terms/stablecoins)), and some are just jokes or 'memes' that became valuable because people like the fun (Memecoins). Essentially, if it's a crypto coin and it's NOT Bitcoin, it's called an Altcoin.
🤓 Expert Deep Dive
The 'Altcoin Beta' is the defining characteristic for portfolio managers in crypto. Altcoins generally exhibit a beta > 1 relative to Bitcoin, meaning they amplify Bitcoin's movements in both directions. A core metric for timing the altcoin market is 'Bitcoin Dominance' (BTC.D); when BTC.D peaks and begins to trend downward while the total market cap stays stable or increases, it signals the onset of an Altcoin season.
Market Microstructure & Liquidity:
Altcoins suffer from the 'Liquidity Gap.' While Bitcoin has hundreds of billions in daily volume, Altcoins often have thin order books. This results in 'Positive Slippage' during hype cycles and 'Liquidation Cascades' during crashes. Traders also monitor the 'ETH/BTC' pair, as it often leads the rest of the altcoin market. Technically, most altcoins today are built as ERC-20 (Ethereum) or SPL (Solana) tokens rather than independent blockchains, relying on the 'Shared Security' of the parent chain. This has shifted the definition of 'Altcoin' from 'alternative chain' to 'alternative asset' within a modular ecosystem.