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description: Basic Financial Services of Zootopia
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# StableSwap AMMs

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​​Utilizing a _Zootopia Stableswap_ model, users are able to:

Swap stablecoins at **hyper-efficient** exchange rates with **minimal slippage.**&#x20;

Earn a **sustainable and optimal yield** on their assets via **Muli-staking** pools.

We maximize capital utilization to fuel DeFi growth and adoption



——Zootopia Finance forked with Curve. For Details, check [CURVE WHITEPAPER.](https://curve.fi/files/crypto-pools-paper.pdf)
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## Why provide stableswap service?

Although stable swaps seem like a simple enough concept, they're actually quite complex under the hood. Although complex, their efficiency has made stable swaps one of the most important tools in decentralized finance (DeFi) today.

<figure><img src="https://2086198824-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F71UJ3AkuDxZDM7fkjqlT%2Fuploads%2FBukVOJzDJk2ua8P3Q7Sq%2Fimage.png?alt=media&#x26;token=0dde2bd7-a4b3-43ef-bf7b-df4f4e0aa636" alt=""><figcaption></figcaption></figure>

### **How Stableswap Invariant Pools Work**

Stableswap pools are the middle ground between constant product pools and constant price pools. A constant price pool is similar to a constant product pool, but uses a constant sum formula _**Rx**_+_**Ry**_=**k**, resulting in a constant price **∆x** / **∆y** = 1.

The stableswap invariant algorithm uses an amplification parameter **A** that determines how close the stableswap curve should be to the constant product curve; an amplification value of 0 (_A = 0_) achieves results identical to the constant product pool algorithm; higher values of _A_ push the curve closer to the constant price curve, resulting in lower slippage for exchange rates close to 1:1.

The formula for the stableswap invariant works by combining terms representing the constant product and constant sum formulas. It's using the constant **D** to represent the total number of tokens in the pool when token X and token Y have an equal price, and **A** represents the amplification parameter. The formula can be written as:

<figure><img src="https://2086198824-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F71UJ3AkuDxZDM7fkjqlT%2Fuploads%2FYrxYrJyoYRK7peEOQH0R%2F1_jaOX55FN35nDLx2T_MX23w.jpeg?alt=media&#x26;token=a6ec3aa0-b479-400e-b5f9-59f077d0b321" alt=""><figcaption></figcaption></figure>

#### Zootopia can gain the following advantages by developing a DEX exchange:

* Sustained and stable fee income.
* Provide liquidity for stablecoins trading pairs, **BNB-stkBNB** trading pairs, **ETH-womETH** trading pairs and other basic trading pairs, enriching the BSC network ecology.
* Provide liquidity for Zootopia's financial lending services and derivatives trading.

## Differences from other DEXs

Zootopia pool features unilateral liquidity provision where only one type of token is needed. No liquidity pair token-making is required from your cauldron, which makes liquidity provision impeccably flexible and scalable.

In addition to providing basic Base Reward income, Zootopia also allows users to use **Citizen Passport NFT for Boost**.
