They made a mistake, but support corrected it in an acceptable timeframe I give Poloniex 3 stars, because my experience was mixed and not ideal, but support resolved the issue acceptably quickly. I transferred cryptos to the site several times without problems but the last time the transfer just vanished from my history, although the tokens did arrive based on the blockchain records. This shocked me and I immediately thought of a scam. I contacted the support and they responded after a few hours and told me, that the will forward this information to the technical department. After not hearing from them for 3 days I contacted the support again and they assured me that they are processing my request. Two days later the deposit arrived. So it took 5 days to resolve the issue, which is acceptable for me, but the errors on the website should be resolved in the future to avoid such errors.

Limit sell orders were not executed and… Limit sell orders were not executed and market sell orders were held for a moment followed by a red wick and at the bottom of the wick my order was sold 8% lower.

Poloniex & Circle are a SCAM!!!! STAY AWAY!!!!! WARNING - DO NOT USE THIS SCAM EXCHANGE!!!! Locks accounts leaving users unable to withdraw their coins. Absolutely no customer support whatsoever - all support tickets are ignored. This exchange is owned by Circle.com - look them up on TrustPilot - their reviews are the same, stealing money, demanding ID, blackmail, scam, etc, etc. Poloniex & Circle are a SCAM!!!! STAY AWAY!!!!!

SCAM ALERT. Avoid at all costs. Stole money from customers in 2019 when their technical incompetency lost them 1800 BTC. They called the theft "socialized losses". Most victims of the theft have not been reimbursed in 2022 still, 3 years later, even though the exchange is still running and in business. Customer service is being useless and dodging questions. Poloniex obviously doesn't plan on doing anything. There are many other exchanges out there. Avoid like the plague.

DO NOT USE POLONIEX ITS A SCAM They’ll let you deposit no problem and charge fees for trading but you’ll never be able to get your money back. Been trying to move some coins to another platform for weeks and they review each transaction then block it. Reason for block ( unfamiliar IP address or unrecognised wallet or similar). Support tool is a joke, takes you round in circles until you give up. Place your investments elsewhere.