sXDAI

Custom price feed for Savings xDAI (sDAI) on Gnosis Chain.

Custom price feed for Savings xDAI (sDAI) on Gnosis Chain. sXDAI is an ERC-4626 vault share that accrues yield from the Gnosis Chain savings rate. The price is derived from the vault's current share-to-xDAI conversion rate multiplied by the xDAI/USD price read from the NAV's own primary feed.

Source: sXDAI_CustomPriceFeed.sol

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

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Approach

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

sXDAI price feed — how its oracle inputs compose into a USD price, with the staleness gate.

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Price calculation

decimals = sDAI.decimals()                       // vault share decimals
rate     = sDAI.convertToAssets(10^decimals)     // xDAI per 1 sDAI (vault decimals)
price    = xDAI_USD × rate / 10^decimals

Input	Source	Description
convertToAssets()	IERC4626(sDAI)	xDAI backing per 1 sDAI at the current savings rate
xDAI_USD	NAV base — getPriceDataNoDivergence(xDAI) (8 dec)	the NAV's primary xDAI/USD price

xDAI on Gnosis Chain is the native gas token, pegged to DAI. The Gnosis savings rate accumulates directly in the sDAI vault, so convertToAssets reflects real-time interest accrual. Vault decimals are read once at deploy. Result carries the feed's 8 decimals.

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Constructor

constructor(
    address sDai_,
    address nav_,
    address baseAsset_
)

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

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Staleness

The price is stale if the base USD price is ≤ 0, or if the NAV reports the base asset (xDAI) stale — all its feeds stale. The base leg's updatedAt comes from the NAV's selected xDAI feed. The convertToAssets rate has no heartbeat — it is a live view on the ERC-4626 vault.

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Chains

Deployed on Gnosis only. There is no Ethereum counterpart in this system: mainnet registers DAI but not sDAI, so no sDAI feed is configured there.