isBlackListed Function
isBlackListed is a public, read-only function on the USDT contract that anyone can call to check whether a given address currently carries the blacklist flag. It costs no gas to call off-chain and returns a simple true or false.
isBlackListed is a public, read-only function on the USDT contract that anyone can call to check whether a given address currently carries the blacklist flag. It costs no gas to call off-chain and returns a simple true or false.
Check a wallet before you act
Run a FreezeRadar scan for issuer-freeze signals, sanctions exposure, counterparty risk, and freezeable asset sensitivity before moving funds.
What it means
Because the function is a public view call, it is the most direct way to verify blacklist status yourself, without trusting a third party's claim about a wallet. Any Ethereum node, block explorer, or script can call it against the live contract and get an answer that reflects the current state, not a cached or estimated one.
This is different from checking historical event logs, which show when an address was added or removed but require indexing transaction history. isBlackListed answers only "is this address blocked right now," which is usually the more urgent question before sending funds.
Real-world example
Block explorers like Etherscan expose a "Read Contract" tab on the verified USDT contract where isBlackListed can be called directly against any address for free, returning the live answer in seconds.
Related terms
In FreezeRadar
A FreezeRadar scan calls the equivalent live check across every supported freezeable asset in one request, so you get a current answer without touching a block explorer yourself.
Related reading
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By FreezeRadar Team
Research and product team behind FreezeRadar.