A rug pull is when a crypto project's creators abruptly withdraw funds, abandon development, or otherwise exit with investors' money, leaving a token that's collapsed in value or become untradeable. The name comes from the idiom "pulling the rug out" — the floor disappears with no warning.
There are two broad patterns. A hard rug pull happens fast and deliberately: the team drains the project's liquidity pool in a single transaction, or uses a hidden function in the token's contract to mint and sell an enormous new supply, crashing the price to near zero within minutes. A slow rug pull is subtler — the team quietly stops development, stops engaging with the community, and sells off their own holdings gradually, so the token fades away rather than collapsing instantly.
Certain warning signs show up before most rug pulls, though none of them guarantee one is coming. An anonymous team with no verifiable track record is a real risk factor, not a neutral detail. Liquidity that isn't genuinely locked (or where the "lock" can't be independently verified on-chain) leaves the door open for an instant hard rug. A token contract with functions that let the owner mint unlimited new supply, or pause other holders' ability to sell, hands the team a technical ability to rug regardless of their stated intentions. And aggressive hype with very little substantive product behind it is a pattern worth real scepticism.
Before putting money into a new or small-cap token, it's worth doing the boring checks: look up the contract address on a block explorer, check whether liquidity is actually locked and for how long, see whether the contract has been independently audited, and search for the team's identity and track record outside the project's own marketing. None of this is foolproof, but it catches a meaningful share of the worst cases.