What is Token Supply?
How it works
Token supply is defined at the protocol level, often in the genesis block or smart contract code. For example, Bitcoin enforces a hard cap of 21 million coins via its halving schedule, while Ethereum has no fixed max supply but uses EIP-1559 to burn a portion of transaction fees, dynamically adjusting net issuance. ERC-20 tokens on Ethereum specify total supply in their constructor, with minting and burning functions that alter circulating supply.
Circulating supply is the subset of total supply that is not locked, staked, or reserved. It is used to calculate market capitalization (price × circulating supply). Total supply includes all tokens ever created, minus any that have been provably burned. Max supply is the theoretical upper limit, which may never be reached if burning outpaces minting. Protocols like Binance Coin (BNB) conduct periodic token burns to reduce total supply over time.
Supply mechanics directly influence tokenomics. A fixed supply can create scarcity (e.g., Bitcoin), while inflationary models (e.g., Dogecoin with no cap) encourage spending. Some tokens, like rebase tokens (e.g., Ampleforth), adjust supply algorithmically to target a price peg. Smart contract audits verify supply functions to prevent infinite mint exploits.
Why it matters
Token supply determines scarcity, inflation rate, and potential price appreciation. A low or decreasing supply can drive demand, while high inflation may dilute holders. Investors assess supply metrics to gauge long-term value and project sustainability. Understanding supply helps avoid scams with hidden mint functions or misleading circulating counts.
Real-world examples
Bitcoin has a fixed max supply of 21 million, enforced by its halving schedule. Ethereum has no hard cap but uses EIP-1559 to burn fees, reducing net issuance. Binance Coin (BNB) burns tokens quarterly until 50% of its initial supply is removed. Dogecoin has an uncapped supply with a fixed annual issuance (about 5 billion DOGE per year), so its inflation rate gradually declines over time.
FAQ
What is the difference between circulating supply and total supply?
Circulating supply is the number of tokens publicly available and tradeable, while total supply includes all tokens ever created, minus those burned. Locked or reserved tokens are part of total supply but not circulating.
Can token supply change after launch?
Yes, many tokens have mint and burn functions that allow supply to increase or decrease. Fixed-supply tokens like Bitcoin cannot be minted beyond their cap, while others like Ethereum can adjust via protocol upgrades.
Why is max supply important for investors?
Max supply sets a hard limit on how many tokens can ever exist, creating scarcity. A low max supply relative to demand can support price growth, while no cap may lead to inflation and dilution.
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