A freeze check reads one fact: whether the address is on Tether’s blacklist in the USDT contract. Etherscan’s Read Contract tab answers it straight from the contract on Ethereum; BlockSec’s and USDTBanList’s free checkers cover Ethereum and TRON in one step. None of them needs your wallet, and none can see a hold placed by an exchange.
What a freeze check shows — and what it doesn’t
- It shows whether Tether has blacklisted the address in the USDT contract on that network. A blacklisted address cannot send USDT.[1]
- The blacklists are separate for each network. Check the network your USDT is on.
- It cannot see a hold inside an exchange account. For that, see exchange froze your crypto.
- It is a snapshot. An address that is clean today can be blacklisted tomorrow.
- It is not an AML check. An AML score looks at where the money came from; a freeze check only reads the blacklist. See how to check USDT before receiving it.
The four free options
Compared from each tool’s own pages on 13 October 2026. We did not connect a wallet or sign up anywhere.
| Tool | Run by | Networks | Wallet or sign-up? | Good to know |
|---|---|---|---|---|
| BlockSec USDT Freeze & Blacklist Checker[2] | BlockSec, a blockchain security company (it also runs MetaSleuth) | Ethereum, TRON | No | USDT only. A vendor tool that leads to BlockSec’s paid compliance products. |
| USDTBanList[3] | Not named on its site — see our note | TRON and Ethereum; USDT and USDC | No, for the free checks | Watches the USDT and USDC contracts for blacklist events and also checks the OFAC and NBCTF sanctions lists. Telegram alerts; paid AML checks. Our review. |
| Etherscan — Read Contract[4] | Etherscan, Ethereum’s main block explorer | Ethereum | No. Etherscan says only Write Contract needs a wallet. | Reads the answer straight from the contract. A few more clicks. |
| Tronscan — contract page[5] | Tronscan, TRON’s block explorer | TRON | Not verified by us — if it asks to connect a wallet, stop | The TRON contract has the same blacklist functions as on Ethereum. |
Check on Etherscan, step by step
- Open the USDT contract on Etherscan. Its address is 0xdAC17F958D2ee523a2206206994597C13D831ec7; make sure the page shows this exact address and the name Tether USD.[1]
- Open the Contract tab, then Read Contract.
- Find isBlackListed (or getBlackListStatus), paste the address you want to check and press Query.
- true means Tether has blacklisted the address; false means it has not.
On TRON, the USDT contract is TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t on Tronscan, with the same functions.[5]
Never use “Write Contract” or “Connect to Web3” for a check. Reading the blacklist needs no wallet and no signature. Sites that ask you to connect a wallet to “check” USDT are a known scam — see our live list of fake AML checkers.
Which to use
- Quick answer for Ethereum or TRON: BlockSec’s or USDTBanList’s free checker.
- Want the answer from the source: Etherscan’s Read Contract, which reads the contract itself.
- Want to know where the money came from as well: an AML checker — compare them on USDT TRC-20 and USDT ERC-20.
If the address is blacklisted, read why USDT gets frozen and what you can do.
This guide is general information, not legal or financial advice. Rules differ by country and change; check the linked sources.
FAQ
Do I need to connect my wallet to check if USDT is frozen?
No. The blacklist is public. Paste the address into a checker or use Read Contract on a block explorer. A site that asks you to connect a wallet is a scam risk.
Does “not blacklisted” mean my funds are safe?
It means Tether has not frozen the address at the moment you checked. An exchange can still hold a deposit, and the address can be blacklisted later.
Can I check USDC too?
Circle keeps its own blocklist for USDC. USDTBanList says its free checks cover USDC on Ethereum as well as USDT.
Sources
- Etherscan — Tether USD (USDT) on Ethereum: verified contract code. Checked 4 Nov 2026.
- BlockSec (vendor) — USDT Freeze & Blacklist Checker. Checked 4 Nov 2026.
- USDTBanList — USDT & USDC Ban List: live blacklist tracker. Checked 4 Nov 2026.
- Etherscan — How to use Read or Write Contract features on Etherscan. Checked 4 Nov 2026.
- Tronscan — Tether USD (USDT) on TRON: contract. Checked 4 Nov 2026.