Decentralised finance (DeFi) seeks to decentralise traditional financial services like exchanges, lending and borrowing. Over the last couple of years, DeFi protocols have exploded in popularity and a large part of the sector's growth is due to the decentralisation of liquidity via global liquidity pools. Decentralised Exchanges (DEXs), borrow-lend protocols, synthetic assets, on-chain insurance and yield farming all utilise liquidity pools. Liquidity pools are used in conjunction with smart contracts to facilitate financial services.
In traditional finance (CeFi), liquidity is provided by a centralised organisation, such as a bank. In the case of a cryptocurrency exchange, it is usually provided by a market maker that matches buyers with sellers. However, in DeFi, liquidity is provided by individual users that are incentivised to deposit their cryptocurrency in return for rewards. Rewards can come as a share of the transaction fees or additional cryptocurrency tokens.
At the time of writing (May 2021), the total value locked in DeFi liquidity pools is currently $83 billion.
A liquidity pool can be thought of as a pot of cryptocurrency assets locked within a smart contract. The funds can then be used for exchanges, loans and for many other applications.
By far the most popular use case for liquidity pools is on decentralised exchanges, which have become the backbone of the DeFi ecosystem. Decentralised exchanges allow users to swap cryptocurrency assets via smart contracts. They are able to achieve this through the application of an automated market maker (AMM).
A traditional order book exchange working with liquidity pools is extremely inefficient on smart contracts. The process requires a lot of time and a higher amount of gas fees. Luckily, the innovation of AMMs removes the need for an order book exchange. The AMM allows traders to exchange directly with the liquidity pools, which lowers slippage and means the exchanges can run 24/7.
A liquidity pool is usually composed of 2 cryptocurrency tokens that create a market for anyone wishing to exchange between the 2. Some exchanges also offer multiple crypto asset pools.
The most popular decentralised exchange is Uniswap, with over $7 billion in total value locked in the protocol at the time of writing. Uniswap leverages liquidity pools with an automated market maker (AMM) to offer instant cryptocurrency exchanges.
Other popular exchanges that utilise liquidity pools include AAVE, Curve, SushiSwap and Balancer.
A liquidity provider (LP) is a user that supplies a liquidity pool with cryptocurrency assets so that the funds can then be used for the associated DeFi protocol.
Anyone can become a liquidity provider in DeFi and with the innovation of AMMs, the combination has truly opened up the financial capabilities of an individual.
Liquidity providers need to deposit cryptocurrencies of equal proportion into a liquidity pool. This provides a market for that cryptocurrency pairing that others can then use to trade.
In return for providing liquidity to a market, the LP is offered a return on investment. Without LPs, trades could not occur, so, as LPs are facilitating trades, they are rewarded with a percentage of the transaction fees. The amount that a LP is rewarded depends on the percentage of the liquidity pool that they provide.
When liquidity providers offer liquidity to a DeFi protocol they must deposit their own cryptocurrency assets. In exchange for depositing real cryptocurrency assets, LPs receive liquidity provider tokens (LPTs) that represent the users' share of the chosen liquidity pool. LPTs can be thought of as a receipt, used to show proof of ownership.
The liquidity provider token is key to the function of automated market makers (AMMs) used on many exchanges. By receiving LPTs in exchange for deposits it ensures protocols are non-custodial, meaning each user has complete control of their digital assets. The user can use the LPTs to withdraw their staked deposit at any time.
The other major benefit of liquidity provider tokens is that they can multiply the liquidity within the DeFi space. LPTs are created as ERC-20, Ethereum-native, tokens which means they can be used on other DeFi protocols just like the underlying assets they represent.
In order to provide liquidity, assets must be locked in a protocol, which reduces the overall amount of liquidity in the DeFi ecosystem. Liquidity provider tokens solve this problem, because they can be taken and used in additional DeFi services, as the LPT represents ownership of a real amount of money, albeit in a new form.
You can think of this as leveraging, or "double-dipping" – taking a single piece of capital and using it for multiple purposes at once. Similar to how a family might choose to use their house as collateral to take out a loan on a second investment property, without having to give up the underlying asset (the family home).
To get a better understanding of this, let's look at how you can earn the SUSHI token on the decentralised exchange SushiSwap.
The ETH-DAI originally deposited would be earning a proportion of the fees collected from exchanges on that liquidity pool and at the same time, you would be earning the SUSHI token in return for staking your LPTs.
AAVE
A lending and borrowing protocol for both stablecoins and altcoins. Users are offered both variable and stable interest rates on loans.
How to use AAVE for lending and borrowing.
Uniswap
The most popular decentralised exchange currently where users can exchange any ERC-20 token with hundreds of liquidity pools.
How to provide liquidity on Uniswap and earn interest.
Balancer
A decentralised exchange where users can create liquidity pools with up to 8 cryptocurrencies rather than the standard 2. LPs can also set the transaction fees when exchanging with a specific liquidity pool.
How to use Balancer for trading.
Curve Finance
A decentralised exchange focused on the trade of stablecoins such as USDT and USDC. The focus on coins of a stable nature lowers fees and minimises slippage when exchanging.
SushiSwap
Touted as the community-governed decentralised exchange, the protocol offers users up to 3 layers of interest-earning potential.
Let's now look at an example of how to provide liquidity and earn staking rewards from liquidity provider tokens.
For this example, we'll be using Zapper.fi. Zapper.fi is not a DeFi protocol but is a DeFi product aimed at managing DeFi investments. Investing in the DeFi ecosystem can be confusing. A basic understanding of the Ethereum blockchain is usually required. Zapper.fi aims to simplify that process by allowing users to deposit liquidity to different DeFi protocols all from the comfort of one dashboard.
To provide liquidity to the DeFi sector you will need to get a web 3.0 digital wallet such as Metamask. Once you have your Metamask set up you then need to deposit some ETH into it so that you have something that can be used to provide liquidity.
Note: If using a cryptocurrency other than ETH, Zapper.fi may require you to approve a spending limit for the first deposit.
Once the transaction is executed you will receive your associated liquidity provider tokens in your web 3.0 digital wallet. These represent your share of the chosen liquidity pool.
Once you have staked your LPTs, you will then be earning the associated reward. This can be another percentage of the transaction fees or the native cryptocurrency token of that DeFi protocol.
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