Tether’s US dollar stablecoin for the US market, USAT, saw explosive growth in April, with its supply in circulation reaching $140.8 million by April 30, up from $22 million in March. According to Tether’s latest reserve attestation, signed and released by Deloitte on Thursday, this means USAT’s supply jumped by 540 percent in just one month. Over the same period, the reserves backing USAT also scaled rapidly, climbing from $22.2 million to $141.2 million.