OpenUSDT wallet

What is OpenUSDT (OUSDT)?

OpenUSDT, ticker OUSDT, is a dollar token made for the OP Stack world. Instead of each chain getting its own separately deployed wrapper with its own address and its own liquidity, OUSDT is one omnichain token: the same asset appears on Base, on Optimism and on the other OP Stack chains, and moving it between them burns the supply on the chain you leave and mints it on the chain you arrive at through a cross-chain messaging layer, with USDT held as the backing.

For a holder this has one very practical effect. The address you hold it at is the same string on every one of these chains, but the balance is not shared: OUSDT on Base and OUSDT on Optimism are separate balances, and sending to an address on the wrong chain delivers the token to that chain, where the recipient may not be looking. It is also not USDT itself; the two are related by backing, not interchangeable inside a wallet. Fees on both Base and Optimism are paid in ETH, so a small amount of ETH belongs on each chain you actually use.

Tangem keeps the two sides apart rather than adding them up: each chain's OUSDT is its own entry with its own balance, and the network a transfer is going out on is named on the confirmation screen before the card signs it. Read that line, match it to what the recipient expects, and an omnichain dollar stops being confusing, which is reason enough to keep OUSDT here.

Supported networks in Tangem (3): Base, Optimism, Ink.