Synthetix's Kain Warwick Owns sUSD Depeg, Backs SIP-423 Winddown and a BasisVault Successor

Synthetix founder Kain Warwick said sUSD has been off its $1 peg for more than a year and took personal responsibility for what he called treasury mismanagement. In an 11-post thread published this morning, he laid out a plan to wind down the SNX-backed stablecoin and replace it with a new BasisVault-backed instrument expected to run via the protocol's v4 exchange. Warwick's comments follow the passage of SIP-423, previously reported by The Defiant, which would freeze the sUSD contract and compensate holders at a rate of four SNX per sUSD. Warwick went beyond the proposal itself, describing the depeg as the product of multiple failures and explaining the rationale for each step. Treasury has taken in ~30% of supply Warwick said the protocol's treasury has absorbed about 30% of the outstanding sUSD over the past year. He argued that buying back the remaining supply is not viable: selling SNX at current prices to retire the rest of sUSD would destroy value, and there is insufficient demand for locked SNX to restore the peg without worsening the implied discount. He added that locking SNX at today's price implies roughly a 75% discount to the liquid token, "which given the state of the token market is probably accurate." At publication, SNX traded at $0.2426, according to CoinGecko, while sUSD was around $0.25—about $0.75 below its $1.00 target. The 420 Pool trade-off On the 420 pool, Warwick was blunt: the mechanism "very likely saved the protocol from a death spiral at the cost of the sUSD peg." He framed sUSD as a liability borne specifically by SNX holders, which is why SIP-423 would use SNX, rather than cash, to make sUSD holders whole. What Warwick says broke Warwick attributed the depeg to three compounding issues. He called the v3 exchange "a dumpster fire," said the v4 build took far longer to scale than expected, and noted that the intended yield mechanism on sUSD balances—meant to create buy-side demand—never materialized. He said supply previously exceeded $1 billion across sUSD and other synths, and an orderly winddown reduced it to roughly $50 million. The remaining portion, he wrote, is "functionally insolvent" without exchange revenue to support it. "As the founder the responsibility for this mismanagement is mine," Warwick wrote. BasisVault replacement design The forward-looking piece of Warwick's thread is the replacement concept. Instead of a debt instrument backed by SNX, the proposed BasisVault-backed stablecoin would seek yield through funding-rate arbitrage between spot and perpetual positions, rather than relying on collateral in a volatile governance token. Warwick did not provide a launch date or a target supply for the replacement, but positioned it as something intended to operate on the v4 exchange on Ethereum mainnet. Missing the perp cycle Warwick's self-critique focused on a missed market window. He said Synthetix had the architecture and community to compete during the 2023–2024 expansion in onchain perpetuals, but v3 development issues slowed progress while purpose-built perp venues captured growth. "Synthetix was positioned almost perfectly to take advantage of the Perp Dex meta, but we fumbled hard," he wrote. He added that he still holds both SNX and sUSD, calling the position "max pain since 2022." He closed by saying he remains confident in a recovery, while acknowledging the market is not currently pricing one in. Synthetix's total value locked is $32.5 million, according to DefiLlama, with nearly all of it on Ethereum. SNX's market capitalization stands at $83.6 million, per CoinGecko.