“Altcoin” is short for “alternative coin,” and it refers to any cryptocurrency other than Bitcoin. It is a broad, informal label rather than a precise technical category — an altcoin can be a major, well-established smart-contract platform or a brand-new token that launched last week, and lumping every non-Bitcoin asset into one bucket can obscure how differently individual projects actually work and what risks they carry.
Where the term comes from
Since Bitcoin was the first cryptocurrency, every project that came after it was, by definition, an alternative to it — hence “altcoin.” Some early altcoins were near-direct copies of Bitcoin’s code with small tweaks, similar to how Litecoin began. Others took a fundamentally different technical approach, most notably Ethereum, which introduced general-purpose smart contracts and enabled an entire ecosystem of applications to be built on top of a blockchain, rather than the blockchain simply recording transfers of a single currency.
Altcoins are not one type of asset
Because “altcoin” is defined purely by what a coin is not — not Bitcoin — it groups together projects with wildly different purposes and designs:
| Category | What it typically aims to do |
|---|---|
| Smart-contract platforms | Provide infrastructure for building decentralized applications, such as Ethereum and its competitors. |
| Payment-focused coins | Prioritize fast, low-cost transfers, such as Litecoin. |
| Stablecoins | Track a stable value like the US dollar rather than floating freely. |
| Utility tokens | Grant access to a specific application or service built on a blockchain. |
| Governance tokens | Grant holders a vote in decisions about how a specific protocol operates. |
Treating “altcoins” as a single investment category, the way one might treat “small-cap stocks” as a loosely coherent group, understates how different the underlying projects actually are from one another.
Why altcoins tend to be more volatile than Bitcoin
Bitcoin generally has the deepest liquidity and the longest operating history within crypto, which tends to make its price somewhat less erratic than smaller, more thinly traded altcoins, though it remains volatile by the standards of traditional finance. Smaller altcoins often have less trading volume relative to their market capitalization, meaning comparatively modest buying or selling can move the price significantly more than the same dollar amount would move Bitcoin’s price. This is one reason altcoins are frequently described as carrying more risk, on average, than Bitcoin — though risk still varies enormously from one altcoin to the next.
A coin’s low price per unit says nothing about how much risk it carries, and a “cheap”-looking altcoin is not automatically a bargain. What matters is the project behind it, its actual adoption and use, and its market capitalization relative to its stated goals — not the number displayed on a price ticker. See our guide on market capitalization for why price alone is a misleading comparison.
Altcoin seasons and Bitcoin dominance
Crypto market commentary sometimes references an “altcoin season,” a period when altcoins as a group outperform Bitcoin, contrasted with periods when Bitcoin outperforms most altcoins. This pattern is often loosely tracked through Bitcoin dominance, the share of total crypto market capitalization held by Bitcoin specifically. These are descriptive market observations, not predictable, repeating cycles you can reliably time in advance, and past patterns in this area, as in any market, do not guarantee future ones.
Tokens versus coins within the altcoin category
Not every altcoin runs on its own independent blockchain. Many are tokens built on top of an existing platform such as Ethereum, using a shared technical standard rather than requiring their own separate network of validators or miners. This distinction matters practically: a token built on an established platform inherits some of that platform’s security and infrastructure, but it also depends on that platform continuing to function well, and its own project-specific risks — the team, the code, the tokenomics — sit on top of that dependency rather than replacing it. Our guide on what cryptocurrency is covers the coin-versus-token distinction in more depth.
Why so many altcoins exist
The relatively low technical barrier to launching a new token, particularly on established smart-contract platforms, has led to an enormous and constantly growing number of altcoins, ranging from serious, well-resourced technical projects to speculative launches with little more behind them than a name and a social media presence. This range is part of why blanket statements about “altcoins” as a category tend to be unreliable — the honest answer to most questions about a specific altcoin is that it depends entirely on the specific project, not on its membership in this very broad category.
How to evaluate an altcoin before treating it seriously
- What problem does it actually claim to solve, and is that problem meaningfully different from what existing, larger projects already address?
- How is its supply structured — is there a maximum supply, how much has already been distributed, and how concentrated is ownership among a small number of wallets?
- How long has it operated, and has it been tested through both rising and falling markets rather than only a period of broad enthusiasm?
- How liquid is it — can you reasonably expect to buy and sell at a fair price, or is trading thin enough that a modest order moves the market significantly?
Our comparison tool lets you look at several of these data points across different assets side by side, and our glossary defines terms you are likely to encounter while researching a specific project.
Risks that concentrate more heavily in altcoins
These risks do not apply equally across the entire altcoin category, but they show up disproportionately more often among altcoins than among Bitcoin specifically, largely because of Bitcoin’s comparatively longer track record and deeper liquidity.
- Lower liquidity in many smaller altcoins, which can make it harder to exit a position at a fair price during periods of stress.
- Less operating history, meaning fewer market cycles a given project has actually been tested through.
- Higher concentration of ownership in some newer projects, where a small number of wallets can hold a large share of the circulating supply.
- Greater prevalence of outright scams and abandoned projects relative to the largest, most established assets.
This guide is educational and is not financial advice. Cryptocurrency prices are volatile and you should never risk money you cannot afford to lose. Always do your own research before acting.
Frequently asked questions
Is Ethereum an altcoin?
Yes, technically -- any cryptocurrency other than Bitcoin is an altcoin, including Ethereum, despite it being one of the largest by most measures.
Are all altcoins riskier than Bitcoin?
Generally, altcoins as a group show higher volatility and lower liquidity, but this varies enormously by project. A large, liquid altcoin differs a lot from a newly launched, thin one.
What does altcoin season mean?
An informal term for a period when altcoins broadly outperform Bitcoin. It describes a pattern from past cycles, not a predictable or guaranteed recurring event.
Is a token the same thing as a coin?
Not exactly. A coin generally has its own blockchain; a token is typically built on top of an existing platform. Both can qualify as altcoins if not Bitcoin.