Tether is an altcoin that has a lot of mysteries, when it was first released to the market, tether coin used for alternative reserves that replaced USD in trading activities in several exchanges.
the Tether inc company claims that Tether is backed up by USD, and every Tether has the same value of USD
1: 1. but something makes me doubt is that there is no official agreement between Tether and USD. the meaning has no legality value between Tether and USD.
today I have seen Tether on the market, and its value is stable, and has the same value with USD.
finally, I believe that Tether is USD and USD is Tether.
Tether doesn't need to have any agreement with any USD, USD is just a currency, Tether has agreement with the banks where they hold the said money, so the agreement should be between Tether and the banks and of which i believe that is in place.