# Add Liquidity Guide

Balancer v3 supports several different types of add liquidity operationsopen in new window

# Core Concepts

The core concepts of adding liquidity are the same for any programming language or framework:

• The sender must do a permit2 approval with the Router as the spender for each token
• Token amount inputs/outputs are always in the raw token scale, e.g. 1 USDC should be sent as 1000000 because it has 6 decimals
• If a pool's tokens include an ERC4626 with an initialized buffer, you have the option to add liquidity using the asset() of the ERC4626, which we refer to as the "underlying" token.
• Transactions are always sent to the appropriate Router
  • Use the standard Router to add liquidity with pool tokens
  • Use the CompositeLiquidityRouter to add liquidity with a pool's underlying tokens
• In exchange for providing liquidity the sender will receive Balancer Pool Tokens (BPTs) which represents their share of the pool and can be used to remove liquidity at any time

# Example Scripts

Run any of the scripts listed below against a local fork of Ethereum mainnet using the v3 pool operation examples repoopen in new window

# TypeScript SDK

• addLiquidityUnbalanced.tsopen in new window
• addLiquidityProportional.tsopen in new window
• addLiquidityUnbalancedToERC4626.tsopen in new window
• addLiquidityProportionalToERC4626.tsopen in new window

# Solidity

• AddLiquidityUnbalanced.s.solopen in new window
• AddLiquidityProportional.s.solopen in new window
• AddLiquidityUnbalancedToERC4626.s.solopen in new window
• AddLiquidityProportionalToERC4626.s.solopen in new window

# Beginner Tutorials