Tether is based on Bitcoin's blockchain so a USDT transaction is actually a bitcoin transaction, therefore you will always need to pay fees.
I've never tried the wallet, and I don't suggest it because it's not even open source but I managed to find Bitpie for that purpose, so instead of paying BTC fees, you will be paying USDT.
Hi OmegaStarScream,
I am the developer of Bither Wallet. Bither is an open-source Bitcoin wallet, and it is the world first Hot/Cold wallet which is using QR-Code as Hot/Cold communication method.
Bitpie.com is another wallet developed by our team. The reason of developing another different wallet in different way is because Bither is a decentralized SPV wallet and it needs to sync blockchain data with nodes on bitcoin network. It is good, but difficult to extend more flexible functions, such as multiple chains or in wallet exchange services. So we developed another wallet, called Bitpie. Bitpie does not communicating with bitcoin nodes directly, it connects to our servers APIs for querying the blockchain data and other things, that means Bitpie is not THAT decentralized.
Bitpie supports multiple different blockchains, for example, Bitcoin, Ethereum, EOS, USDT, TRX, Dash, Zcash, Litecoin, Dogecoin, and so on, and also Bitpie supports ETH ERC20 tokens, EOS/TRX Dapps. Bitpie also supports instant trade (currently in China CNY, we may support USD and HKD in next month), and also instant exchange between different blockchain assets (BTC/ETH/EOS/USDT).
Although Bitpie is not so popular in other country, it is almost the most famous wallet in China today, and we are working hard to help more people all over the world to enjoy our products.
Because Bitpie has different design and purpose with Bither, we use different open-source strategy.
For Bither, it is full open-source, and we are continue our works on it (to make a better decentralized SPV Hot/Cold wallet), and next week, Bither will have another new version with better performance on importing private keys and reloading transaction data.
For Bitpie, it is close-source, we may consider the Bitpie's open-source strategy in the future, but for now, it is still close-source.
Also to remind, today, we have another hardware wallet called BITHD.com , it has card design and watch design, and it supports multiple chains and also supports BTC/ETH/EOS multisig. BITHD is full open-source, including hardware design and firmware source code.
Thanks.
Bither Team