Sky Adviser BA Labs Proposes Zero Debt Ceilings for Five ETH and WSTETH Vaults

BA Labs, the risk adviser to the Sky protocol, has proposed setting debt ceilings to zero for five Ethereum-collateralized vault types, a move that would block all new borrowing against ETH and WSTETH collateral while leaving existing positions intact.

The proposal covers ETH-A, ETH-B, ETH-C, WSTETH-A and WSTETH-B. BA Labs framed the change as a way to reduce potential security risks, according to the proposal text.

The five vault types together carry 771 open positions and approximately 376 million USDS in outstanding debt. That debt load has declined by roughly 25 percent over the past year — a contraction of about 94 million USDS, equivalent to the entire annual budget of a mid-sized public university, withdrawn from the protocol in twelve months.

What changes for borrowers if the proposal passes?

Approval would prevent borrowers from opening new loans or drawing additional debt through the affected vault types. The restriction is one-directional: existing users retain full exit rights.

Specifically, position holders in the five vault types would still be able to:

• Repay outstanding debt
• Add collateral to existing positions
• Withdraw collateral, subject to the original collateralization requirements

Crucially, existing positions would remain governed by their original liquidation rules. No retroactive change to liquidation parameters accompanies the proposal, which means borrowers who maintain adequate overcollateralization face no new forced-exit mechanics.

Why target the ETH and WSTETH vaults?

The rationale BA Labs cited is security risk reduction, not credit deterioration. The debt decline of roughly 25 percent over the past year indicates shrinking utilization rather than stress: fewer borrowers are choosing to mint USDS against ETH and WSTETH collateral through these legacy vault types.

For context on scale: 376 million USDS in debt across 771 positions implies an average position of roughly 488,000 USDS per borrower. This is a wholesale user base, not a retail one. The average position is roughly nine times the median US household income, which frames the counterparty concentration the adviser is working to manage.

What does this change for Sky practitioners?

Three operational consequences follow if governance approves the ceilings.

First, ETH and WSTETH collateral loses fresh borrowing capacity across all five vault types. Users planning new leverage against staked or native Ethereum would need to migrate to alternative vault types or venues before the change takes effect.

Second, the 376 million USDS already outstanding remains a live liability. Repayments will continue to reduce Sky's collateral exposure over time, but the protocol carries the existing stock until borrowers unwind.

Third, the proposal preserves optionality for existing holders. Because repayment, collateral addition and withdrawal remain available, the change functions as a controlled wind-down of new issuance rather than a forced deleveraging event.

The governance path ahead

The proposal now moves through Sky's governance process, where SKY token holders vote on executive changes to protocol parameters. Debt ceiling adjustments of this kind typically require an executive spell execution after a governance poll, a timeline that historically runs on the order of days rather than weeks.

Until the vote concludes, borrowing through the five vault types remains open. Borrowers with pending plans to mint USDS against ETH or WSTETH collateral should treat the governance timeline as an effective deadline: once the executive spell executes, new debt through these vault types is closed.

If approved, the change would consolidate Sky's Ethereum-collateral exposure into a shrinking legacy book, with the protocol's future borrowing capacity concentrated in its newer vault architecture.