USDD launched in May 2022, weeks before Terra's collapse demonstrated what happens to algorithmic stablecoins under stress, using a comparable design. It survived, restructured, and remains the weakest-scoring stablecoin we rate.
What changed after 2022
The protocol moved toward over-collateralisation, publishing reserve addresses holding TRX, BTC and USDT. That is a genuine improvement over the original mechanism and it is not equivalent to reserves in cash and treasuries: the collateral is volatile, a large portion is the ecosystem's own token, and its value under stress correlates with exactly the conditions that would threaten the peg.
The peg record
USDD has traded meaningfully below par on more than one occasion, including during the 2022 stress and again in 2023. A stablecoin that has broken its peg repeatedly has demonstrated something about its mechanism that no amount of subsequent restructuring erases.
Governance
Control is concentrated around the Tron ecosystem and a single well-known individual, with limited independent oversight. For an instrument whose entire value proposition is a credible promise, that concentration is the central problem.
Who should use it
Users who need it for a specific Tron-ecosystem purpose, at minimum size and minimum duration. There is no scenario in which we would recommend holding it in preference to USDC, USDT or USDS.