# Add new pool implementation contracts to crvUSD StableSwap factory

**URL:** <http://gov.curve.finance/t/add-new-pool-implementation-contracts-to-crvusd-stableswap-factory/9632>\
**Category:** Proposals\
**Created:** [September 18, 2023, 6:04pm UTC](http://gov.curve.finance/t/add-new-pool-implementation-contracts-to-crvusd-stableswap-factory/9632 "2023-09-18T18:04:36Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![bout3fiddy](http://gov.curve.finance/letter_avatar_proxy/v4/letter/b/94ad74/32.png) [@bout3fiddy](http://gov.curve.finance/u/bout3fiddy)\
**Post date:** [September 18, 2023, 6:04pm UTC](http://gov.curve.finance/t/add-new-pool-implementation-contracts-to-crvusd-stableswap-factory/9632/1 "2023-09-18T18:04:36Z")

</div>

**Summary** :

Add new stableswap implementation contracts to crvusd stableswap factory.

**Abstract** :

Adds 2 new implementation contracts:

```auto
NEW_IMPLEMENTATIONS = {
    "balances": "0x7Ca46A636b02D4aBC66883D7FF164bDE506DC66a",
    "prices": "0x0C9D8c7e486e822C29488Ff51BFf0167B4650953"
}

```

To crvUSD Stableswap factory: `0x4F8846Ae9380B90d2E71D5e3D042dff3E7ebb40d`

**Motivation** :

These will allow pools like:

1. crvUSD \<\> stUSDT (rebases are _not_ taken by Admin, LPs keep all of the rebases).
2. crvUSD \<\> sDAI (or tokens that use rate oracles; useful for USD RWAs like sDAI so long as it remains stable).

**Specification** :

The implementation contracts are not new: they already exist. but crvUSD factory does not have them (only has one implementation contract for plain pools). The improvements to the existing implementation contracts are: EMA oracles.

> <https://github.com/curvefi/curve-factory/pull/47>
>
> Implementation contracts deployed at: \[CurveStableSwap2BalancesEMA\](https://ethe…rscan.io/address/0xf3a6aa40cf048a3960e9664847e9a7be025a390a#code), \[CurveStableSwap2PricesEMA\](https://etherscan.io/address/0x5702BDB1Ec244704E3cBBaAE11a0275aE5b07499#code)

**For** :  
onboard new amm implementation because the dao wants to see new crvUSD \<\> asset pool types.

**Against** :  
reject new amm impementation.

---

<div class="post-metadata">

**Author:** ![mimaklas](http://gov.curve.finance/user_avatar/gov.curve.finance/mimaklas/32/1264_2.png) [@mimaklas](http://gov.curve.finance/u/mimaklas)\
**Post date:** [September 19, 2023, 4:44pm UTC](http://gov.curve.finance/t/add-new-pool-implementation-contracts-to-crvusd-stableswap-factory/9632/2 "2023-09-19T16:44:22Z")

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Vote: [https://dao.curve.fi/vote/ownership/440](https://dao.curve.fi/vote/ownership/440)