Investing into a Liquidity Pool

This guide will teach you how to find the correct liquidity pool instance to invest in, how to invest and get the respective tranche tokens in return, and how the whole system flows behind the scenes.

Deployed Contracts

Pick the contracts deployed on the network you want to invest from. You will need them on the Step 2. below.

• Ethereum
  • PoolManager - 0x78E9e622A57f70F1E0Ec652A4931E4e278e58142
  • Circle USDC - 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48

Steps

1. ERC20 Approval

   The user should call the ERC20 approval on the investment currency (e.g. USDC on Ethereum) to allow the Liquidity Pools contract to manage those funds for them

2. Pick the correct LiquidityPool instance

   With the appropriate PoolManager contract instance, call the following:

   PoolManager.getLiquidityPool(poolId, trancheId, currency)

   NOTES:

   • The currency param should be the USDC token address in the respective network.
   • The LiquidityPool offers an interface based on EIP-7540, an extension of EIP-4626

3. Invest into a LiquidityPool

   Now that you have the LiquidityPool instance at hand, you can invest into it by calling:

   LiquidityPool.requestDeposit(uint256 amount, address receiver)

   Once submitted, the amount is locked on the escrow contract.

   Then, the pool issuer needs to fulfill this request.

   Once that's done, yield starts to accrue immediately and the user can claim their tranche tokens.

4. Claim the tranche tokens

   Once the request from step 3. is fulfilled, the user can claim their tranche tokens equivalent to y by calling:

   LiquidityPool.mint(uint256 y, address receiver)

   NOTE: y needs to be ≤ maxDeposit. The user can find that amount by calling LiquidityPool.maxDeposit.

Overview

Behind the scenes, this is what takes place on steps 2 and 3: