Altcoin
Last Updated: October 30, 2026
Quick Answer: An altcoin is any cryptocurrency other than Bitcoin. The name is short for “alternative coin,” and it covers everything from smart contract platforms such as Ethereum and Solana to stablecoins, exchange tokens and memecoins. On October 30, 2026, altcoins were worth about $1.05 trillion combined, or roughly 40% of the whole crypto market, according to CoinMarketCap.
Key Takeaways
- Every crypto asset that is not Bitcoin counts as an altcoin, including Ether, XRP, BNB, Solana and stablecoins such as USDT and USDC
- Bitcoin held about 60% of total crypto market value on October 30, 2026 (CoinMarketCap), so altcoins made up about 40%, worth about $1.05 trillion
- Ether is the largest altcoin, at about $272 billion, or about a quarter of all altcoin value
- Stablecoins were worth about $278 billion, so a large part of the “altcoin market” is dollar tokens, not speculative coins
- CoinMarketCap lists more than 40,000 cryptocurrencies but classed only 8,063 as active, a reminder that most altcoins fade away
How Altcoins Work
Bitcoin was the first cryptocurrency: its rules were published by Satoshi Nakamoto, and the network started in 2009, according to bitcoin.org. Every coin created since then is, by definition, an alternative. Some copied Bitcoin’s code and changed a few settings, such as block time or supply. Others built entirely new systems.
Altcoins fall into two technical groups:
- Coins run on their own blockchain. Ether (ETH) is the native coin of Ethereum, SOL of Solana and XRP of the XRP Ledger. The coin pays transaction fees and, on proof of stake networks, is locked up by validators to secure the chain.
- Tokens are issued on top of another chain through a smart contract. Most stablecoins, governance tokens and memecoins are tokens on Ethereum, Solana, BNB Chain or Tron.
Each project sets its own rules for supply, issuance and use, which together are called its tokenomics. Bitcoin is capped at 21 million coins, according to bitcoin.org; Ether has no fixed maximum supply.
Altcoin Market Size in 2026
CoinMarketCap’s global data, updated at 03:48 UTC on October 30, 2026, put the total crypto market at about $2.61 trillion. Bitcoin’s share, often called Bitcoin dominance, was 59.9%, leaving altcoins with 40.1%, or about $1.05 trillion. CoinGecko, which tracks a different set of coins, showed Bitcoin dominance of 57.9% the same day, so altcoins made up about 42% on its numbers.
The share moves over time. When altcoins outperform Bitcoin for a period, traders call it “altcoin season”; when Bitcoin dominance rises, money is moving back toward Bitcoin or out of the market altogether.
Altcoin Examples in 2026
These were among the largest altcoins by market cap on CoinGecko on October 30, 2026:
| Altcoin | Type | Market cap (Oct 30, 2026) |
|---|---|---|
| Ethereum (ETH) | Smart contract platform | about $272 billion |
| Tether (USDT) | Stablecoin | about $180 billion |
| BNB (BNB) | Exchange and chain token | about $92 billion |
| XRP (XRP) | Payments network | about $79 billion |
| USDC (USDC) | Stablecoin | about $71 billion |
| Solana (SOL) | Smart contract platform | about $57 billion |
| TRON (TRX) | Smart contract platform | about $32 billion |
| Dogecoin (DOGE) | Memecoin | about $12 billion |
Privacy coins also ranked high that day: Zcash (ZEC) at about $21 billion and Monero (XMR) at about $11 billion. Live prices for the largest altcoin are on our Ethereum price page.
Large altcoins have also reached regulated markets. On May 23, 2024, the US Securities and Exchange Commission approved rule changes that allowed eight spot ether exchange traded products to list on NYSE Arca, Nasdaq and Cboe BZX, according to the order published in the Federal Register.
Risks and Common Misconceptions
“Altcoins are cheaper versions of Bitcoin.” A low price per coin says nothing about value. What matters is market cap, supply and what the network is used for. On October 30, 2026, Dogecoin at about $0.08 was worth more in total than Monero at about $587, according to CoinGecko.
“Most altcoins survive.” Many do not. CoinMarketCap counted 40,052 cryptocurrencies in its database on October 30, 2026, but classed only 8,063, about 20%, as active. Projects lose developers, users and exchange listings.
“All altcoins are speculative.” Stablecoins are altcoins too, and they are built to hold one dollar, not to rise. They were worth about $278 billion on October 30, 2026, about a quarter of all altcoin value, according to CoinMarketCap.
Other risks include thin liquidity on smaller coins, large holdings by founders or early investors, smart contract bugs, and memecoins that depend almost entirely on attention. Prices of smaller altcoins can move sharply in both directions.
Related Terms
For data driven outlooks on individual coins, see our price prediction section.
Frequently Asked Questions
What is an altcoin in simple terms?
An altcoin is any cryptocurrency that is not Bitcoin. The word comes from “alternative coin.” Bitcoin launched in 2009, and every coin since then counts as an alternative to it. That includes large networks such as Ethereum and Solana, dollar stablecoins such as USDT, and small memecoins. Altcoins differ widely in purpose, design, supply rules and risk.
Is Ethereum an altcoin?
Yes. Ethereum’s native coin, Ether (ETH), is the largest altcoin. It had a market cap of about $272 billion on October 30, 2026, according to CoinGecko, roughly a quarter of all altcoin value. Some people avoid the label for Ethereum because it is a very different network from Bitcoin, but by the standard definition any coin other than Bitcoin is an altcoin.
Are stablecoins altcoins?
Yes. Stablecoins such as Tether (USDT) and USDC are not Bitcoin, so they fall under the altcoin definition, and they are included in altcoin market data. On October 30, 2026, stablecoins were worth about $278 billion, according to CoinMarketCap. Unlike most altcoins, they are designed to hold a steady value of about one US dollar.
What is altcoin season?
Altcoin season is a period when most large altcoins rise faster than Bitcoin. Traders watch Bitcoin dominance, Bitcoin’s share of total crypto market value, to spot it. When dominance falls, altcoins are gaining share. On October 30, 2026, Bitcoin dominance was about 60% on CoinMarketCap and about 58% on CoinGecko. These conditions do not follow a fixed schedule.
How many altcoins are there?
There are tens of thousands. CoinMarketCap counted 40,052 cryptocurrencies in its database on October 30, 2026, but classed only 8,063 of them as active. CoinGecko tracked 22,643 coins the same day. The gap shows that many altcoins stop trading or are abandoned, so a coin being listed somewhere says little about its quality.
Data sources: CoinMarketCap global market data (October 30, 2026, 03:48 UTC), CoinGecko market data (October 30, 2026), bitcoin.org, US Securities and Exchange Commission order Release No. 34-100224 (May 23, 2024, Federal Register).