maker

Open a vault by calling openLockETHAndDraw on DssProxyActions through your DSProxy's execute function, passing the CdpManager, Jug, ETH-A join adapter, DaiJoin, ilk bytes32, and DAI amount. This locks ETH and draws DAI in one transaction.

Approve the DaiUsds converter contract to spend your DAI, then call daiToUsds with your address and amount. The conversion is always 1:1 with no fee, and both DAI and USDS coexist on mainnet.

Vat/not-safe means the vault would be undercollateralized after the operation, where ink times spot is less than art times rate. Add more collateral, draw less DAI, or call jug.drip first to update the stale rate accumulator.

Wad is 10^18 for token amounts and normalized debt, ray is 10^27 for rate accumulators, and rad is 10^45 for internal DAI balances in the Vat. Actual vault debt equals art multiplied by rate, and confusing these units causes precision errors.

Direct Vat.frob calls are possible but strongly discouraged because they require manual rad-denominated math and prior vat.hope authorization. DssProxyActions via DSProxy handles unit conversion, jug.drip, and multi-step operations atomically.

Clipper.take fails if you lack internal Vat DAI rather than ERC-20 DAI, if you have not called vat.hope for the Clipper, if the auction needs a redo due to stale price, or if a partial take would leave dust collateral.