What Are Altcoins?

"Altcoin" means any cryptocurrency other than Bitcoin — a catch-all covering everything from Ethereum and billion-dollar infrastructure projects to tokens created as jokes last Tuesday. The label tells you nothing about quality; the useful skill is sorting the thousands of altcoins into a handful of categories, because each category has a different purpose, a different way of accruing value, and a different way of going to zero.

Coins vs tokens: the first distinction

Before categories, one structural split that beginners constantly mix up:

• A coin is the native asset of its own blockchain. BTC on Bitcoin, ETH on Ethereum, SOL on Solana. The chain cannot run without it — it pays fees and (on proof-of-stake chains) secures the network.
• A token is an asset issued on top of an existing blockchain via a smart contract, described in the previous guide. It has no chain of its own; it borrows Ethereum's (or another chain's) security and pays fees in that chain's coin.

The practical difference: launching a coin requires launching and securing a whole blockchain; launching a token takes one contract deployment and minutes of work. That asymmetry explains why tokens outnumber coins thousands to one — and why the token universe contains both the most useful and the most worthless assets in crypto.

Layer 1s: the "Ethereum competitors"

Layer 1s are alternative blockchains with their own coins — networks like Solana, BNB Chain, Avalanche, and Cardano — most competing on Ethereum's turf of smart contracts and applications. Their standard pitch is some trade-off Ethereum didn't choose: higher transaction throughput, sub-cent fees, or faster confirmation, usually purchased by accepting more expensive hardware requirements for validators or fewer independent operators — that is, by giving up some decentralization for speed. Where a layer 1's coin has fundamental demand, it comes from the same sources as ETH's: paying fees and staking to secure the chain.

A category next door, covered properly in the DeFi path: layer 2 networks (like Arbitrum, Optimism, and Base) don't compete with Ethereum but process transactions on top of it, inheriting its security — several issue their own tokens too.

The honest history: dozens of "Ethereum killers" have launched since 2017. A few built real ecosystems; many raised large sums, peaked during a bull market, and faded into ghost chains with near-zero activity. When evaluating a layer 1, activity — real users, real applications, real fees paid — matters more than claimed transactions per second.

Utility and governance tokens: shares in a protocol, sort of

Most tokens attach to a specific application — an exchange, a lending market, a game — and grant some mix of:

• Utility: discounts on fees, access to features, or the right to stake in the app's system.
• Governance: voting power over the protocol's parameters and treasury.

These can resemble equity — a claim on a project's success — but the resemblance is loose and legally murky. Many tokens confer no claim on revenue at all: you can hold the governance token of an exchange doing millions in daily fee revenue and be entitled to none of it. Before buying any application token, the question to answer in one sentence is: what exactly does holding this entitle me to, and who has to keep honoring that? If the answer is "nothing, but the number might go up," you know what you own.

Two structural risks specific to this category:

• Supply overhang. Projects typically allocate large token fractions to founders and venture investors, locked for a period and released ("vested") over time. A token can have a modest price and a small circulating supply while billions more tokens await unlock — future sell pressure that is public information, printed in the project's docs, and routinely ignored by buyers. Always check circulating supply against maximum supply (the market cap guide later in this path shows how).
• The protocol can thrive while the token doesn't. Token price and protocol success are only connected if the token's design connects them.

Stablecoins: the altcoins that aren't bets

By trading volume, the most-used altcoins are stablecoins — tokens engineered to hold a fixed value, almost always $1.00. They're the working capital of crypto markets: traders park in them between positions, and they settle enormous transfer volume. They belong in this map because you'll encounter them immediately, but they get a dedicated guide later in this path covering how the pegs work and when they break. For now: a stablecoin is not an investment; it's a dollar-shaped tool with its own risks.

Memecoins: pure attention assets

Memecoins — Dogecoin being the ancestor — are tokens whose explicit value proposition is the joke, the community, and the possibility that attention begets price. There is no cash flow, no utility claim, and usually no pretense of one.

Treat the category with clear eyes. A handful of memecoins have minted fortunes for early holders and sustained communities for years. The overwhelming majority go to zero, and the category is crypto's densest habitat for manipulation: creators holding huge hidden supply, coordinated pump-and-dump groups, and rug pulls — where the team drains the token's trading liquidity and disappears. By the mid-2020s, launch platforms had made creating a memecoin a minutes-long, nearly free act, producing thousands of new tokens per day, nearly all of which die within days. If you participate at all, use only money whose total loss would genuinely not matter, and assume the median outcome is exactly that.

How to place any altcoin in the map

When you meet a new asset, five questions sort it quickly:

1. Coin or token? Own chain, or issued on someone else's?
2. What job does it claim to do? Secure a network, power an application, track a dollar, or entertain?
3. Where would demand come from if speculation stopped tomorrow? Fees, staking, and genuine usage are durable sources; "community" alone is not.
4. What's the supply picture? Circulating vs maximum supply, and who holds the locked portion.
5. Is anyone actually using it? On-chain activity is public; a project's real usage can be checked, not just its marketing.

A sober closing note on the category as a whole: Bitcoin and Ethereum together account for the majority of the entire crypto market's value, and in past bear markets most altcoins fell further than BTC and many never recovered their prior highs even when BTC did. Altcoins are where crypto's genuine innovation happens — and where most of its wreckage accumulates. Both facts are true at once.

Key Takeaways

• "Altcoin" just means "not Bitcoin" — the label spans serious infrastructure, application tokens, stablecoins, and jokes, so categorize before judging.
• Coins run their own blockchains; tokens are issued on someone else's in minutes — which is why tokens are both abundant and, on average, far lower quality.
• Layer 1s compete on trade-offs (usually speed vs decentralization); judge them by real usage, not claimed throughput.
• Application tokens are not shares: check what holding one actually entitles you to, and check locked supply awaiting release before trusting the price.
• Memecoins are pure attention assets where total loss is the median outcome; size any participation accordingly.