syrupUSDC (L2)

Custom price feed for Maple Finance syrupUSDC on Layer 2 networks.

Custom price feed for Maple Finance syrupUSDC on Layer 2 networks. On L2s, a dedicated Chainlink syrupUSDC/USDC feed is available and used directly, multiplied by the USDC/USD price read from the NAV's own primary feed.

Source: syrupUSDC_L2_CustomPriceFeed.sol

L2 feed. For the Ethereum mainnet feed, see syrupUSDC.

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

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Approach

Chainlink syrupUSDC/USDC × USDC/USD (from the NAV's primary feed via getPriceDataNoDivergence(USDC))

syrupUSDC (L2) price feed — how its oracle inputs compose into a USD price, with the staleness gate.

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Price calculation

price = syrupUSDC_to_USDC_rate × USDC_USD / 10^syrupUSDC_to_USDC_feed.decimals()

Input	Source	Description
syrupUSDC_to_USDC_rate	Chainlink syrupUSDC/USDC	syrupUSDC exchange rate in USDC
USDC_USD	NAV base — getPriceDataNoDivergence(USDC) (8 dec)	the NAV's primary USDC/USD price

The syrupUSDC/USDC rate is read live from Chainlink; the USDC/USD base term is read from the NAV's primary feed. Result carries the feed's 8 decimals.

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Constructor

constructor(
    address syrupUsdc_,
    address syrupUsdcToUsdcChainlink_,
    uint256 syrupUsdcToUsdcHeartbeat_,
    address nav_,
    address baseAsset_
)

Parameter	Description
syrupUsdc_	The syrupUSDC token address
syrupUsdcToUsdcChainlink_	Chainlink syrupUSDC/USDC oracle
syrupUsdcToUsdcHeartbeat_	Staleness window (seconds) for the syrupUSDC/USDC feed
nav_	NAVCalculator (proxy) — supplies the base stablecoin's USD price via getPriceDataNoDivergence
baseAsset_	The registered base stablecoin whose USD price is read (USDC)

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Staleness

The syrupUSDC/USDC rate leg checks its own Chainlink heartbeat: it is stale if the rate is ≤ 0 or if block.timestamp − effectiveUpdatedAt ≥ heartbeat (effectiveUpdatedAt clamped to block.timestamp). The price is also stale if the base USD price is ≤ 0, or if the NAV reports the base asset (USDC) stale — all its feeds stale. The base leg's updatedAt comes from the NAV's selected USDC feed. The reported updatedAt is the older (minimum) of the rate leg and the base leg.

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Chains

Deployed on Arbitrum. Mainnet uses syrupUSDC (Mainnet), which derives the rate from the ERC-4626 vault instead.