Boosted Pools

(to be initiated later)

Overview

Boosted Pools are designed to facilitate trades between stablecoins while simultaneously forwarding much of the pool's liquidity to external protocols, such as Aave. These versions of Stable Pools don't directly hold the stablecoins themselves, but rather hold the pool tokens of nested Linear Pools, which maintain proper balances of TOKEN and aTOKEN.

Advantages

High Capital Efficiency

Boosted Pools are designed to deliver high capital efficiency by enabling users to provide trade liquidity for common tokens while forwarding idle tokens to external protocols. This gives liquidity providers the benefits of Aave on top of the swap fees they collect from trades.

Superfluid, Consolidated Liquidity

Nesting pool tokens create a powerful avenue to make swaps between any stablecoin and any aToken in the Boosted Pool. On top of that, any token in a pool with a Boosted Pool Token can tap directly into the underlying tokens.

How Do They Work?

Linear Pools

Linear Pools are the base component of Boosted Pools. They use Linear Math to facilitate trades between two tokens at a known exchange rate. They also use a positive/negative fee mechanism to incentivize arbitrageurs to maintain a desired ratio between the two tokens. For example, the Balancer Aave Boosted Pool (DAI) balances DAI with aDAI, facilitating DAI trades while maintaining a large aDAI balance for an extra boost to Liquidity Providers.

Phantom Pool Tokens ("Phantom BPT")

One of the key features that make trades through Boosted Pools so simple is the use of Phantom BPT. Normally when a Liquidity Provider joins/exits a pool, the pool mints/burns pool tokens as needed. This is gas-intensive and requires users to execute a join or exit.

In pools that use Phantom BPT, however, all pool tokens are minted at the time of pool creation and are held by the pool itself. With Phantom BPT, Liquidity Providers use a swap (or more likely a batchSwap) to trade to or from a pool token to join or exit, respectively.