[SIP2.30] Add siUSD to Lower Risk USDC Vault

Governance Summer Improvement Proposals [SIPs]
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Summary

This SIP proposes integrating siUSD into the USDC – lower risk vault on mainnet in the Lazy Summer Protocol.

Following technical review and risk diligence, siUSD meets Lazy Summer’s standards for inclusion. For background, see the discussion in **[RFC] Onboarding infiniFi siUSD into Summer.fi USDC mainnet vault.**

This integration enhances Lazy Summer’s vault diversification and provides access to yield sources beyond standard [e.g., DeFi lending or staking] protocols.

Motivation

  • Expand Yield Sources – siUSD yield comes from fixed-term PTs and liquid lending strategies. This complements existing Summer.fi strategies by adding institutional-grade, diversified yield complementing existing vault strategies.
  • Attract New Users – InfiniFi currently holds $125M+ TVL with a strong base of whales and retail depositors. Onboarding siUSD brings this community closer to Summer.fi while appealing to risk-aware stablecoin user , expanding protocol reach.
  • Increase TVL – With InfiniFi’s 45% MoM growth and 16–17% weekly TVL compounding, this integration is expected to channel new deposits into Summer.fi, strengthens the Lazy Summer product offering and supports growth goals for the siUSD vault family.

Specification

Parameter Value
Vault USDC Mainnet – Low Risk
Network Ethereum
New ARK InfiniFi siUSD (Senior Tranche Strategy)
Contract Address 0xDBDC1Ef57537E34680B898E1FEBD3D68c7389bCB
Risk Tier Lower Risk
$SUMR Rewards In line with [corresponding vault reward policy]

@Recognized_Delegates @BlockAnalitica @halaprix @0xtucks

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Thanks @samehueasyou for bringing this proposal first posted as an RFC by @Valbpereira forward!

I recall the above, which makes me curious if anything changed and the siUSD can become part of the Lower Risk fleet, or else, this proposal should be renominated to Higher Risk Fleet strategy for onchain vote submission.

InfiniFi already has traction and strong growth. Tapping into their depositor base could help Lazy Summer DAO attract a complementary audience of stablecoin users who may not yet be engaged with our protocol. Looking forward to seeing @BlockAnalitica sharing risk diligence more formally so delegates can evaluate alongside performance metrics.

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great point - will change to higher risk

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The proposed InfiniFi siUSD Ark for the High Risk Fleet on Ethereum USDC was evaluated with our risk model, which considers TVL, collateral quality, and exposure. We estimated withdrawal limits at about $38M per 24 hours, based on liquid and time-maturing illiquid assets, and modelled a scenario where assets should be fully withdrawn within 72 hours (being a HR fleet). Based on this assessment, we propose the following initial parameters:

Ark Symbol/Vault maxCap Max. %TVL maxInflow maxOutflow
infiniFi siUSD 74,000,000 31.0% 6,000,000 9,300,000

The cooldown period for all Arks in this Fleet is 10 minutes. These parameters ensure the Fleet operates within controlled risk limits while accommodating expected demand.

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