> For the complete documentation index, see [llms.txt](https://docs.suilend.fi/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.suilend.fi/steamm/what-is-steamm.md). # What is STEAMM? ## What is STEAMM? STEAMM is Sui’s first Superfluid AMM, designed to maximize capital efficiency by integrating directly with Suilend’s lending markets. While many traditional AMMs leave a large portion of their liquidity idle, STEAMM puts those unused funds to work on Suilend, earning additional yield without compromising swap liquidity. STEAMM features a modular swap architecture - supporting constant-product (CPMM), virtual constant-product (vCPMM), and oracle market maker (OMM) quoters - making it highly adaptable to various token types and market conditions on Sui.

Example from the WAL-USDC pair showing how idle liquidity on STEAMM is redeposited into Suilend for additional yield.

*** ## **What pools types does STEAMM support?** STEAMM supports three types of pricing curves: **constant-product (CPMM)**, **virtual constant-product (vCPMM)**, and **oracle quoter (OMM)**. * CPMM is the classic AMM model (used by Uniswap v2), where reserves follow the formula *x*y=k\*. It requires both sides of the trading pair (e.g., SUI and MEME) to be supplied upfront, and pricing is entirely determined by the current reserve ratio. * vCPMM behaves similarly to CPMM in terms of pricing, but introduces a “virtual reserve” on one side of the pool. This allows a pool to launch with liquidity on only one side - say, just MEME and no SUI - and still simulate balanced pricing. It’s ideal for token launches where the issuer wants to bootstrap liquidity without needing to pair against a base asset like SUI. * OMM combines oracle pricing with dynamic fees. Rather than using reserve ratios to determine price, OMM uses an external oracle price (e.g., from Pyth) as the base price, then adds a liquidity fee that scales with trade size. This protects against toxic flow and price manipulation while keeping slippage realistic for large trades. **CPMM:** Best for: everyday trading pairs like SUI/USDC or SUI/MEME **vCPMM**: Best for: launching new tokens or bootstrapping liquidity with just one token **OMM:** Best for: stable pairs, low-slippage trades and more efficient pricing for large or volatile assets ## **What fees does STEAMM have?** When swaps are made via STEAMM, a protocol fee of 20% is incurred. For example, if a swap is made from a pool with a fee tier of 0.3%, 80% of the fee (0.24%) is distributed to liquidity providers (LPs), while the remaining 20% (0.06%) is reserved as the protocol fee.