# Fuse

Fuse (opens new window) is an open interest rate protocol that allows users to lend and borrow digital assets. The Fuse protocol enables anyone to instantly create and deploy their own lending and borrowing pool. This protocol allows users to choose all of their custom parameters and isolate risk, rather than using a large lending and borrowing pool on other platforms. Pools can be made public or private depending on the creator's preference.

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If you would like an interactive version of this step-by-step process, we have published a Fuse YouTube Tutorial (opens new window) to help!

# What Are The Fees?

By default, 10% of all interest paid by borrowers.

However some pools have lower fee rates as voted on by governance.

# How to Earn Interest

Step 1: Connect a Wallet

The Rari Capital ecosystem currently supports MetaMask (opens new window), WalletConnect (opens new window), Portis (opens new window), Torus (opens new window), Fortmatic (opens new window), and Authereum (opens new window). If you do not have a wallet, we recommend you refer to this guide (opens new window)for MetaMask. Users can connect their wallets by selecting the "Connect Wallet" button on the Rari Capital Fuse Portal (opens new window).

Step 2: Become Friendly With the Fuse Dashboard

Once connected, users will see Supply Balance and Borrow Balance. It's okay for these to both be $0 when you connect for the first time. Now that you are looking at the main dashboard, it's time to start getting comfortable with the user experience. Normally when you enter an open interest rate protocol portal like Compound Finance (opens new window), Aave (opens new window), or CREAM (opens new window), you will immediately see supply and borrow tabs. This is different for Fuse, as you have to select the pool you want to lend or borrow to first! Once you select the pool that fits your choice of assets and parameters, you will now be looking at a screen with two sides: Supply and Borrow. The Supply side shows assets that you can supply to this specific Fuse pool to earn interest, while the Borrow side shows assets that you can borrow from this specific Fuse pool. Remember, everything you do in one Fuse pool is kept isolated from the rest of the pools on the platform.

Step 3: Supply Assets to Fuse

  1. Select the asset that you would like to supply.

  2. Enable permissions for the Fuse protocol to interact with your asset by confirming the Ethereum transaction.

    Note: this will cost gas.

  3. A new window will pop up on your screen displaying the current supply APY and it will adjust based on the amount you type in.

  4. Now that the token has been enabled and you have typed in your desired amount to lend, click Supply and you are all done!

    Note: this is a transaction that will cost gas.

You have now supplied your first asset to a Fuse pool! On your main dashboard, you will see Supply Balance populate with the equivalent amount (in dollars) to your newly supplied asset.

Note: This asset will no longer appear in your wallet as it is now within the Fuse Protocol. You will immediately receive an fToken that represents your share in the pool. You will not have to worry about this token, but when you withdraw, your fToken will be used to redeem the underlying supply balance.

You will only earn interest when the pool is being utilized by borrowers.

# How to Borrow

Step 4: Borrow Against Your Supplied Collateral

Now that you have supplied assets, you have the opportunity to borrow assets in the same Fuse pool! Why might you do this? Users are constantly seen borrowing against their assets to gain leverage (borrowing stablecoins to buy more tokens) or borrowing to short an asset (selling an asset and buying it back at a later date), or even a chance to take out money against an appreciating asset that you do not wish to sell.

Note: There is a significant amount of risk when borrowing assets, and you should do your own research and education before using this functionality

  1. Select the asset that you would like to borrow.

  2. A new window will pop up on your screen displaying the current borrow APY and it will adjust based on the amount you type in.

  3. Now that the token has been selected and you have typed in your desired amount to borrow, click borrow and you are all done!

    Note: this is a transaction that will cost gas.

Step 5: Understanding Liquidation Health

Ethereum-based assets can be extremely volatile in price action, meaning your supplied amount can change rapidly (in USD value for example) which could cause the amount you can borrow to change abruptly based on price moments.

A Liquidation is when your Borrow Limit reaches its full capacity. Once this health bar (at the top of your dashboard) reaches 100%, your balances will be liquidated. This can come from collateral (supplied amount) dropping in value, or borrowed assets surging in value. When you get liquidated, a computer within the community will repay a percentage of your outstanding borrowed amount, as well as keeping a reward from your collateral based on the liquidation incentive percentage found on each Fuse pool's dashboard.

Note: You should always do your own research regarding liquidations and find a safe haven for your health limit. When borrowing assets, you should consistently be checking the analytics monitor to avoid unforeseen liquidations.

Note: You should be aware that sending your fToken (Fuse ownership asset) to another wallet that is affiliated with a current borrowing postion, you will be liquidated as the protocol does not see your collateral position anymore.

What’s an example of when an account needs liquidation? Let’s follow this same example to illustrate it. $1m in OHM as collateral. $100k USDC borrowed. $333k borrow limit. Now let’s say OHM collapses to 1/4th of its previous value. My collateral is now worth $250,000 and my borrow limit would be $83k USDC but I have $100k USDC borrowed. This account is under-collateralized and needs a liquidation.

What happens once it needs liquidation? A liquidator will come along, and repay some or all of your USDC debt. For every $1 of your debt they repay, they get to take $1.12 of your collateral. This $0.12 bonus is defined as the liquidator incentive and is used to ensure the pool stays healthy. This amount is chosen by the pool creator.

The liquidation mechanic is necessary to prevent the pool from going underwater, however, most users will want to avoid being liquidated if possible.

# How to Withdraw

Step 6: Re-Paying Loans

When you are ready to return back the borrowed asset, you will follow the same steps above in reverse.

  1. Select the asset that you are currently borrowing and press the re-pay tab.

    Note: You will have an option to re-pay the max amount or type in your desired amount

Step 6: Removing Collateral/Supplied Asset

If you would like to stop earning interest on your supplied asset and regain ownership of it in your Ethereum wallet, it is time to remove the token from the Fuse pool.

Note: In the background, you have now redeemed your fToken for the underlying amount that we discussed earlier. This is an example of a decentralized system as the protocol never took custody of your funds.

  1. Select the asset that you are currently supplying and press the withdraw tab.

    Note: You will have an option to withdraw the max amount or type in your desired amount

We understand this process can be very tedious for your first time, but be proud of yourself for making it this far! You are on your way to becoming a strong DeFi user who understands and takes advantage of the protocols aimed at removing the need to trust an institution with your finances.

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# The following parameters and preferences are chosen by the pool creator when creating a Fuse pool:

  • Custom Assets

As long as there is an oracle (shown below), a Fuse pool can support it.

  • Custom Oracles (Chainlink, Uniswap/Sushiswap TWAPS, Keep3r)

If there is an oracle feed supported by the protocol that reports price information for the asset, then the token can be used on Fuse.

  • Platform Fee

10% of all fees accrued is distributed to the $RGT community owned treasury (opens new window).

  • Admin Fee

Fuse pool creators can choose to add a fee on top of the protocol fee.

This is the additional collateral given to liquidators as an incentive to perform liquidations of underwater accounts. For example, if the liquidation incentive is 1.1, liquidators receive an extra 10% of the borrower's collateral for every unit they close.

  • Whitelist

Fuse pool creators can choose for a pool to be permissioned for select Ethereum addresses if they choose. This could be for KYC purposes down the road for future partnerships helping to develop capital on-ramps.

The percent, ranging from 0% to 100%, of a liquidatable account's borrow that can be repaid in a single liquidate transaction. If a user has multiple borrowed assets, the closeFactor applies to any single borrowed asset, not the aggregated value of a user’s outstanding borrowing.

  • Upgradeability

When the upgradeability function is turned ON, the underlying Fuse pool Smart Contracts can be modified, as well as any pool parameters that were set during the pool creation stage.

A fToken's (Fuse liquidity proof token) collateral factor can range from 0-90%, and represents the proportionate increase in liquidity (borrow limit) that an account receives by minting the fToken.

Generally, large or liquid assets have high collateral factors, while small or illiquid assets have low collateral factors. If an asset has a 0% collateral factor, it can't be used as collateral (or seized in liquidation), though it can still be borrowed.

The reserve factor defines the portion of borrower interest that is converted into reserves.

Reserves are an accounting entry in each fToken contract that represents a portion of historical interest set aside as liquid cash which can be withdrawn or transferred through the protocol's governance. A small portion of borrower interest accrues into the protocol, determined by the reserve factor.

  • Pool Admin

Deployer and owner of the pool. This can be a singular Ethereum address, a multi-sig, DAO contract, etc. The address that owns and manages the pool is for parameter upkeep.

# Supported Price Oracles

  • AlphaHomora V1
  • AlphaHomora V2
  • Badger Price
  • Balancer LP
  • Base Price
  • Chainlink
  • Curve Liquidity Gauge
  • Curve LP Token
  • Fixed ETH Price
  • Fixed EUR Price
  • Fixed Price
  • Fixed Token
  • Fixed USD
  • Keep3r Price
  • Keep3r V2 Price
  • Master Price
  • mStable Price
  • Opeth Price
  • Preferred Price
  • Synthetix Price
  • Recursive Price
  • Uniswap LP Token
  • Uniswap TWAP Price
  • Uniswap V3 TWAP Price
  • WSTETH Price
  • YVault V1 Price
  • YVault V2 Price