Thanks for tagging @tim!
Hi @diwu1989,
we recently introduced a 20M one-to-one cUSD/USDC pool which now allows everyone to buy and sell large amounts of cUSD at par. So even if at some CEXs cUSD drops below 0.996 occasionally, there should now always be the alternative to buy or sell at par at Curve. Additionally, we are launching an entirely revamped version of Mento next week (see Mento Core Contract Upgrade #1 - Multi Collateral Mint). This upgrade allows to directly redeem against non-CELO reserve assets like USDC in larger quantities and can be expected to tighten the price range of cUSD significantly. The same goes for cEUR and cREAL for which we aim to add cEUR/USDC and cREAL/USDC pairs in the new multi-collateral Mento setup very soon (like 4 weeks from now) .