What are Altcoins?

The term "altcoin" — alternative coin — covers every cryptocurrency that isn't Bitcoin. Ethereum is an altcoin. Solana is an altcoin. A token someone launched as a joke at 2 AM with a dog logo and zero utility is also an altcoin. The category spans from $300 billion market caps to projects worth less than a used car.

As of early 2025, CoinGecko tracks over 14,000 cryptocurrencies. Bitcoin's market dominance — its share of total crypto market cap — fluctuates between 40% and 65% depending on the cycle. When dominance falls, it usually means money is rotating into altcoins. When it rises, capital is retreating to the relative safety of BTC.

Most altcoins will go to zero. That's not a prediction — it's historical fact. Of the roughly 5,000 tokens launched during the 2017 ICO boom, over 90% have lost more than 95% of their value. Many are completely dead — no development activity, no trading volume, no community. The graveyard is enormous. The survivors are the ones worth studying.

Lumping all altcoins together is like lumping Amazon, a local bakery, and a Ponzi scheme together because they're all "businesses." The categories matter because they carry fundamentally different risk profiles and value drivers.

Layer 1 platforms — Ethereum, Solana, Avalanche, Cardano — are base-layer blockchains competing to be the infrastructure for decentralized applications. Their tokens pay for gas, secure the network through staking, and accrue value as ecosystem activity grows. They're the closest thing crypto has to blue chips (if blue chips could lose 80% in a bear market).

DeFi tokens — UNI, AAVE, MKR, CRV — represent governance and sometimes revenue rights in decentralized finance protocols. Their value is tied to protocol usage: total value locked, trading volume, fee revenue. Uniswap has generated over $3 billion in cumulative fees. Whether UNI token holders capture that value is an ongoing governance question.

Stablecoins are pegged to a reference asset (usually USD) and are covered in their own article. They're technically altcoins but behave nothing like them.

Meme coins — DOGE, SHIB, PEPE, WIF — have no protocol revenue, no technological moat, and often no development roadmap. Their value is pure social coordination. Dogecoin's $20+ billion market cap is backed by nothing but cultural momentum and Elon Musk's Twitter feed. This makes them simultaneously the easiest to dismiss and the hardest to ignore.

Utility and infrastructure tokens — LINK (Chainlink), FIL (Filecoin), RNDR (Render) — power specific services. Chainlink's oracle network feeds real-world data to smart contracts across every major chain. These tokens have identifiable revenue models and usage metrics, which makes them easier to analyze but doesn't make them safe investments.

Bitcoin dominance — BTC's share of total crypto market cap — is the single most useful macro indicator for altcoin traders. The pattern has repeated across every cycle since 2017.

During bear markets and early recoveries, capital concentrates in Bitcoin. Dominance climbs from the low 40s toward 60%+. Institutional money enters through BTC-only vehicles (ETFs, futures, Grayscale trusts). Altcoins bleed against both USD and BTC.

In late bull markets, dominance drops sharply. Retail arrives. Risk appetite expands. Money rotates from BTC into ETH, then into large-cap alts, then into small caps and meme coins. This cascade is what people call "alt season." It happened in January-May 2018, again in January-May 2021, and the early signals appeared in late 2024.

The cycle isn't guaranteed to repeat, but the incentive structure hasn't changed. New money enters through Bitcoin because it's the most legible crypto asset. As conviction builds, that money migrates down the risk curve. Watching dominance tells you where in that rotation the market sits.

The uncomfortable reality: buying and holding a random altcoin is a losing strategy. A study by Chainalysis found that most tokens launched since 2020 have negative lifetime returns. The median altcoin significantly underperforms Bitcoin over a full cycle. The handful that outperform BTC by 10x or 100x create survivorship bias that makes the entire space look more profitable than it is.

If you're going to trade altcoins, some discipline helps. Check whether the project has real usage — on-chain metrics like daily active addresses, protocol revenue, and developer activity are harder to fake than Twitter followers. Look at token unlock schedules — many projects have massive insider allocations that vest over 2-4 years, creating constant sell pressure. And pay attention to the float: a token with a $500 million market cap but only 10% of supply circulating has $5 billion of potential selling waiting to hit the market.

On GaiaEx, altcoins are available across spot and perpetual markets. The non-custodial architecture means you're never exposed to exchange custody risk during volatile periods — when altcoins crash, exchange withdrawals are typically the first thing to freeze on centralized platforms. On GaiaEx, your wallet is yours regardless of what the market does.