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Fees

Borrow APR

Solend charges an interest rate for borrowing assets. The borrow APR is set algorithmically, a function of utilization of the pool.
The following piecewise function is used:
Which then produces the following graph:

Protocol Fees

Interest Rate Spread

Interest rate spread is a percentage of the borrow interest rate that Solend receives as protocol revenue. The interest spread is 20%.

Origination Fee

Origination fee is a fee charged upon the origination of a loan. Applied once when borrowed, upfront.
Solend's origination fees are broken down into a program fee and host fee. The host fee can be collected by any interface that refers loans to the protocol.
The fees for most vaults are set to 10 bips (0.1%). There's an 80/20 split between protocol and host fee. Check in-app or on the Broken link a page for specific asset rates.

Liquidation Fee

Liquidation fee is a percentage of the liquidation penalty that Solend receives. These funds go to the DAO treasury. The liquidation fee is currently 30% of the liquidation penalty.

Solana Network Fees

There are two types of fees you pay on the Solana blockchain when transacting: transaction fees and rent fees.

Transaction fees

These fees compensate the validator network for the CPU/GPU and network resources necessary to process the state transaction. Transaction fees are extremely cheap (currently 0.000005 SOL).

Rent fees

These fees compensate the validator network for the memory resources that are required to store state in an account. Accounts which maintain a minimum balance equivalent to 2 years of rent payments are exempt from paying rent. When solend.fi is used, accounts are allocated on behalf of the user and funded with enough SOL to be rent-exempt. This amount can be recuperated later when the account is closed (though this isn't yet implemented on solend.fi). Rent fees can be expensive compared to transaction fees (~0.01 SOL), but are only paid the first time a user is interacting with Solend.