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Rug Pull
A rug pull is a fraudulent exit scam in cryptocurrency where project developers abandon a project and abscond with investor funds after gathering significant capital. They typically remove liquidity from a DEX pool, dump team token allocations, or stop development and disappear, leaving token holders with worthless assets and no recourse.
A rug pull is when a project's insiders take investors' money and walk away, typically by draining liquidity, minting and dumping tokens or abandoning the project after a sale. Warning signs include anonymous teams with unlocked tokens, liquidity that is not locked, owner functions that can mint or blacklist, and pressure to buy fast.
A rug pull, by definition, is one of the most destructive types of DeFi scams. Knowing how to identify early warning signs protects investors from catastrophic losses.
How big the problem has been
Chainalysis counted more than $2.8 billion taken in rug pulls in 2021, about 37% of all crypto scam revenue it tracked that year. Most of that came from one case, the Turkish exchange Thodex, whose founder disappeared in April 2021 with customer funds. The rest came from a long list of smaller DeFi projects. Rug pulls cluster in hot markets, when new tokens launch every day and buyers move fast.
The usual mechanics
A token is launched and paired with ETH or another coin in a pool. Buyers swap into it and the price rises. Then the team pulls its liquidity tokens out of the pool, taking the ETH side with it, and the token's price collapses with nobody left to buy from. Variations include hidden mint functions, a tax setting that can be raised to 100% on sales, and contracts that block selling for everyone but the owner. All of that is a hard rug. A soft rug is slower: the team sells its own tokens a little at a time and quietly stops working on the project.
Checks that take five minutes
Look the contract up on a block explorer and see whether the source code is verified. Check whether ownership has been renounced or sits with a multisig. See whether the liquidity tokens are locked, for how long and by whom. Look at the holder list: a few wallets holding most of the supply is a red flag. Token scanners can spot common traps, though they miss new ones.
If it happens to you
Getting money back after a rug pull is hard. Save transaction hashes, addresses and screenshots, and report to the exchange the money moved through and to the police. Watch out for recovery services that contact you offering to get funds back for a fee; that's a common second scam.