SIP - 11: Add native USDC on Sonne Finance (OP mainnet)

##Summary This proposal advocates for adding native USDC support to the SONNE FINANCE platform. Unlike the bridged USDC.e currently supported, native USDC is the official, directly issued version by Circle, offering enhanced stability, security, and lower fees.

###Background On September 5th, 2023, Circle officially announced native USDC on OP Mainnet. Native USDC on OP Mainnet, issued directly by Circle and fully backed by US dollars, stands as the definitive version of USDC within the ecosystem, offering developers and users a reliable and stable base. In contrast, USDC.e (currently supported on SONNE as USDC) is a bridged version of USDC from Ethereum, lacking direct issuance by Circle and compatibility with CCTP, Circle Account and Circle APIs.

It is also an ERC-20 token, and can be issued and redeemed from Circle and used on-chain with popular DeFi protocols like Uniswap or Velodrome.

USDC has a circulating supply and market cap of over 27 Biliion (as of 22.02.2024) on top CEXs and DEXs and natively issued in 14 blockchains. Of these 66,092,472.70 (as of 22.02.2024) USDC ($66M) is available on OP mainnet. About 1M is provided as liquidity pools in Uniswap. LPs on Velodrome paired with USDC is commencing now.

Token Details

Website: https://www.circle.com/en/usdc Documentation: https://www.circle.com/reports/state-of-the-usdc-economy Developer docs: https://developers.circle.com/stablecoins/docs/quickstart-transfer-10-usdc-on-chain CoinGecko(Ethereum Mainnet): https://www.coingecko.com/en/coins/usdc OP mainnet USDC Contract Address: https://optimistic.etherscan.io/token/0x0b2c639c533813f4aa9d7837caf62653d097ff85 Number of Token Holders: 72,058 (22.02.2024) USDC/USD Chainlink Price Feeds: https://optimistic.etherscan.io/address/0x16a9FA2FDa030272Ce99B29CF780dFA30361E0f3

###Purpose: Provide additional liquidity Provide definitive native USDC rather than bridged version Aid OP protocols in migration to native USDC

###Challenges: Needs to be adopted widely as the dominant stablecoin on OP mainnet. USDC is a centralised stablecoin. The stability of USDC comparable to most other coins is commendable although it has also had its depegging events.

###Security Considerations: USDC is fully backed by US dollars held in regulated financial institutions, offering some stability and potential recourse. However, the reserve composition might influence stability depending on the specific assets and the financial institutions they are held. Circle publishes monthly attestations on the reserve composition. The USDC smart contracts have undergone audits by independent firms, but vulnerabilities can still be discovered later. Caveat this by the knowledge that USDC.e(bridged USDC) is already supported by SONNE and has additional bridge risks on top.

###Proposal: I propose that SONNE FINANCE add support for USDC on OP mainnet chain. This would provide users with a number of benefits, including, additional liquidity and improved security.

###Technical implementation, Collateral factor 85% Reserve factor 10% Supply cap unlimited Borrow cap unlimited Interest Rate curve - same as for USDC.e (currently on SONNE) Incentivisation YES using $SONNE

###Roadmap After 5 days of discussion on Discord, this will proposal was submitted with amendments for voting as SIP 11.