A hard cap defines the maximum amount of capital or tokens a blockchain project may raise during an initial coin offering (ICO), initial DEX offering (IDO), or presale. Once this ceiling is reached, the sale stops even if additional investors remain eager to participate.
Smart contracts typically automate the hard-cap check and halt further sales at the preset threshold. Community members, analytics dashboards, and security researchers watch these parameters closely. Software errors or malicious alterations that bypass the cap undermine confidence, as illustrated by Bitcoin’s 2010 inflation bug that briefly inflated supply far beyond the intended 21 million coins before developers issued a fix.
Changing a hard cap after deployment demands broad consensus and transparent justification because modifications can affect trust, token economics, and regulatory interpretation.