sCIP#26 - Add a [USDP, [TriPool]] Metapool

Summary:

A proposal to create a Curve Metapool for Unit Protocol stablecoin (USDP) and the 3Pool stablecoins (USDC, USDT, and DAI).

Unit Protocol is a decentralized borrowing protocol that allows you to mint USDP stablecoin using various tokens as collateral, including Uniswap LP tokens.

Unit Protocol uses a set of oracles to quote collaterals and mint USDP, including Chainlink and feeds.uniquote.finance by Keep3r.Network.

Motivation:

Unit Protocol has recently been launched, driving demand for USDP (https://www.coingecko.com/en/coins/usdp).

Such a pool will help make the USDP peg more stable and bring fees and incentives for the Curve ecosystem. Also, with better liquidity and a stable peg, the Curve community will have a better experience utilizing CRV or Uniswap CRV-WETH LP tokens as collateral for minting USDP stablecoin. Sushiswap CRV-ETH LP token will be added soon as well.
It is planned that the pool will be additionally incentivized with the Unit Protocol DUCK token, which will increase liquidity, trading volume, and fees overall.

Links:

Specification:

Security audit conducted by Certik:
https://github.com/unitprotocol/protocol_docs/blob/master/certik-final-report.pdf

Security audit conducted by Mixbytes:
https://github.com/unitprotocol/protocol_docs/blob/master/Mixbytes%20Security%20Audit%20Report.pdf

Poll:

https://signal.curve.fi/#/curve/proposal/QmTFhJtP1s2WvW32EuQaGzDuWuypD5y6yiJW7y2H1Hqhwo

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