Crypto dust is the small amounts of cryptocurrency sent to many addresses. It can be for good or bad reasons. In Bitcoin, a dust amount is about 546 satoshis, which is very small. Tether (USDT) has an even smaller dust limit, often just 0.01 USDT.These small amounts can come from rounding errors or leftovers after a trade. They’re too small to trade but can be changed into the exchange’s token.