Mint function
In short A mint function is code in a token contract that creates new tokens; if a privileged wallet can call it freely, supply can be inflated at will.
Minting means creating new units of a token out of nothing. Every token needs some way to create its initial supply, but what matters is whether that ability remains after launch and who controls it. A mint function that the owner can call any time is one of the classic rug pull tools.
On EVM chains, a contract may have a function like mint(address, amount) restricted to the owner or a minter role. Calling it increases the total supply and credits the new tokens to some wallet, which can then sell them into the DEX pool. On Solana, SPL tokens have a mint authority; while it exists, the holder can mint more, and revoking it fixes supply forever.
For holders, an open mint means the supply numbers you see are not final. A creator can mint billions of tokens and dump them, draining the pool's paired asset while the price heads to zero, even if liquidity is locked. Legitimate uses exist, like stablecoins minting against deposits, staking rewards, or bridges issuing wrapped tokens, but those come with clear rules and controls.
Check whether the contract has a mint function at all, and if so who can call it and whether there is a maximum supply enforced in code. On Solana, confirm the mint authority is revoked or held by a known program. Watch for mint logic hidden under another name, or inside a proxy that could be upgraded to add one later. Token scanners flag most of these, but reading the verified code is the surest check.