Understanding Altcoins: Types, Supply Numbers and Risks Explained
An altcoin is any crypto-asset other than bitcoin. The term covers very different things: separate blockchains with their own coins, tokens issued on top of another blockchain, stablecoins meant to track a currency, and tokens whose main purpose is governance or speculation. Treating them as one group hides the differences that matter most to a buyer: what the token is for, how many exist and will exist, who holds them, and where they can actually be traded. This guide explains the main types of altcoin, how to read the supply numbers you see on data sites, and the risks that come with smaller tokens. It doesn't recommend any coin and makes no price predictions.
Educational content, not financial advice. Most altcoins are more volatile and less liquid than bitcoin, and many have lost most or all of their value.
Coins and tokens are not the same thing
- Native coins belong to their own blockchain and pay its transaction fees. ETH on Ethereum and TRX on Tron are examples.
- Tokens are created by smart contracts on an existing blockchain. On Ethereum, ethereum.org describes ERC-20 as the standard for fungible tokens, which is why thousands of different tokens can share the same wallet and tools.
- The same name can exist on several chains. A token on one network is a different contract from a similarly named token on another. That's why checking the contract address matters; see verifying a token contract before a swap.
The main kinds of altcoin
- Layer-1 coins secure their own blockchain and pay its fees.
- Stablecoins aim to hold a steady value, usually one US dollar or euro. How they do it, and what backs them, differs a lot; our comparison of USDT and USDC shows why.
- Exchange tokens are issued by trading platforms and often give fee discounts on that platform. Their fortunes are tied to the issuer.
- DeFi and governance tokens give votes over a protocol's settings, and sometimes a share of its fees.
- Memecoins have little or no function beyond trading. Their prices depend almost entirely on attention.
- Wrapped and bridged tokens represent an asset from another chain. Their value depends on the contract or bridge that holds the original.
Reading the supply numbers
Data sites show several supply figures for each token. They measure different things:
- Circulating supply: tokens currently available to trade.
- Total supply: tokens that exist now, including those locked or held by the team or treasury.
- Maximum supply: the most that can ever exist, if the rules set a cap. Some tokens have no cap.
- Market cap is price times circulating supply. Fully diluted valuation uses maximum (or total) supply instead.
A large gap between circulating and maximum supply means many more tokens may reach the market later. Look for a published schedule of unlocks and vesting for the team, investors and treasury, and check whether it's on-chain or only in a document. Inflation from staking rewards or emissions also adds supply over time.
Questions to ask about what a token is for
A token's description rarely tells you whether anyone needs to hold it. These questions usually do:
- Does the network or app work without the token? If users can do everything with another coin, demand for this one depends mostly on speculation.
- What do holders actually get? Votes, fee discounts, a share of fees, or nothing beyond the price. Check the documentation, not the marketing.
- Who controls the contract? Admin keys that can mint tokens, pause transfers or change fees give a small group a lot of power over your holding.
- Who funded it and when can they sell? Early investors and the team often bought at far lower prices. Their unlock dates matter.
- Is the activity real? Transaction counts and "users" can be inflated by bots and airdrop farming. Treat headline numbers with care.
Where an altcoin can actually be traded
Liquidity decides what you'll pay and whether you can sell. A token listed only on one small exchange, or with a thin order book, can show a price you can't actually get for any real size. Before buying, check which exchanges list it, which network each one supports for deposits and withdrawals, and the spread on the pair. Remember too that a token you hold in your own wallet on one network may not be accepted by an exchange that only supports another, so moving it could mean a bridge, with its own fees and risks. Volume figures on data sites can also include wash trading on less regulated venues, so look at the order book itself rather than the headline volume. Practical approaches to trading them are in altcoin trading strategies on exchanges.
The risks that come with smaller tokens
- Volatility: the CFTC notes that virtual currencies' value comes entirely from supply and demand, and that they are more volatile than ordinary currencies. Smaller tokens usually move more.
- Concentration of holders: if a few wallets hold most of the supply, their selling can move the price sharply.
- Smart contract risk: a token's contract can contain bugs, admin keys that can mint more tokens, or transfer restrictions.
- Delisting: exchanges remove tokens, sometimes at short notice, leaving fewer places to sell.
- Scams: fake tokens, "rug pulls" and pump-and-dump groups target newer coins. Investor.gov's crypto-asset page warns about fraud in this market.
Do more altcoins mean less risk?
Not necessarily. Owning several altcoins spreads money across names, but they often rise and fall together, so the portfolio may be less diversified than it looks. We look at that question in detail in do altcoins diversify a crypto portfolio?
A five-minute research routine
- Find the official website and documentation, and confirm the contract address from them, not from a chat or ad.
- Read the supply figures and look for a vesting or unlock schedule.
- Check the top holders on a block explorer.
- Look at where it trades, and at the spread and depth on those pairs.
- Decide in advance how much you could lose without it mattering, and size the position to that; see position sizing and exchange risk hygiene.
FAQ
What counts as an altcoin?
Any crypto-asset other than bitcoin. Some people exclude ether and stablecoins from the term, but in everyday use it covers them too.
What's the difference between market cap and fully diluted valuation?
Market cap multiplies the price by the tokens in circulation today. Fully diluted valuation multiplies it by the maximum or total supply, so it shows what the market would value every token at the current price.
Are altcoins riskier than bitcoin?
Generally yes. Most have smaller markets, fewer places to trade, more concentrated holders and more dependence on a single team or contract. Some have fallen close to zero.
Why does the same token show different prices on different exchanges?
Each exchange has its own order book and liquidity. Prices are usually close for widely traded tokens, but can differ more for small ones or during sharp moves.
Sources
- ethereum.org: ERC-20 token standard (checked 2026-11-02)
- CFTC: Understand the risks of virtual currency trading (checked 2026-11-02)
- Investor.gov: Crypto assets (checked 2026-11-02)
Educational content, not financial, legal or tax advice. Crypto-assets are volatile and you can lose the full amount you put in. Exchange features, fees and rules differ by venue and country and change over time; confirm details on official pages. Last verified 2026-11-02.