sDAI

Custom price feed for Sky Savings Dai (sDAI).

Custom price feed for Sky Savings Dai (sDAI). sDAI is an ERC-4626 vault share that accrues value as savings yield accumulates. The price is derived from the vault's current share-to-asset conversion rate multiplied by the NAV's DAI/USD price.

Source: sDAI_CustomPriceFeed.sol

---

Approach

sDAI.convertToAssets(1 sDAI) × DAI/USD (from the NAV's primary feed)

The DAI/USD term is sourced from the NAV's own selector — see Base/USD from the NAV's own selector.

sDAI is a Sky contract, not a Spark one, despite arriving alongside the Spark Savings feeds — Spark ships no Savings DAI vault, and sDAI is the genuine DAI savings vault (it was Spark's savings-DAI product before the USDS rebrand). DeBank still files it under the spark protocol.

---

Price calculation

decimals = sDAI.decimals()                     // vault share decimals
rate     = sDAI.convertToAssets(10^decimals)   // DAI per 1 sDAI
price    = rate × DAI_USD / 10^assetDecimals

Input	Source	Description
convertToAssets()	IERC4626(sDAI)	DAI backing per 1 sDAI share at the current accrued rate
DAI_USD	NAV base — getPriceDataNoDivergence(DAI) (8 dec)	the NAV's primary DAI/USD price

The divisor is 10^assetDecimals (the underlying's decimals), not the share decimals — they differ whenever a vault uses a decimals offset. Result carries the feed's 8 decimals.

---

Constructor

constructor(
    address vault_,
    address nav_,
    address baseAsset_
)

Parameter	Description
vault_	The sDAI vault address (also used to read vault decimals)
nav_	NAVCalculator (proxy) — supplies the base asset's USD price via getPriceDataNoDivergence
baseAsset_	The registered base asset whose USD price is read (DAI); must equal the vault's asset() — reverts BaseAssetMismatch otherwise

---

Staleness

The price is stale if the NAV reports the base asset (DAI) stale — all its feeds stale. The base leg's updatedAt comes from the NAV's selected DAI feed. The convertToAssets rate has no heartbeat — it is a live view on the ERC-4626 vault.

---

Chains

Deployed on Ethereum mainnet. Gnosis prices its own savings-DAI via sXDAI, a separate feed.