How Notional Works

Kyle Long
Kyle Long

Enabling Fixed Rates in the Crypto Ecosystem

Notional makes it possible for anyone to lend or borrow crypto assets at a fixed-rate of interest at any time, from anywhere in the world, in just a few clicks. Unlike other protocols that just serve lenders at fixed rates, or only offer volatile, variable interest rates, Notional serves both sides of the fixed-rate borrowing and lending market.


Behind the scenes, Notional introduces a concept called fCash to make this happen. fCash allows Notional to tokenize payments in different currencies like ETH or USDC at specific points in the future. fCash is what Notional uses to keep track of who owes what, who is owed what, and when.

For example, on Notional, two users can enter into an agreement where a lender gives 100 USDC to a borrower who promises to repay 105 USDC on December 1st.

fCash is how Notional defines that future payment of 105 USDC from the borrower to the lender. Here is how Notional keeps track of the future payment from borrower to lender using fCash:

  • The lender receives +105 December 1st fUSDC (an asset redeemable for 105 USDC on December 1st)
  • The borrower gets -105 December 1st fUSDC (an obligation of 105 USDC due on December 1st).

The exchange rate between USDC and fUSDC at the specific maturity represents the fixed interest rate that users receive on Notional.

Liquidity pools

It would be challenging for individual users to match on exact terms to borrow and lend with each other. With large pools of liquidity, banks traditionally act as an intermediary that borrowers and lenders interact with - for a hefty fee. Notional removes intermediaries and maintains on-chain liquidity pools that serve as a ready counterparty for individual users at any time.

Liquidity pools hold cash, like USDC, on one side, and fCash, like December 1st fUSDC on the other side.

  • Lenders put their USDC into the pool and take out December 1st fUSDC at the prevailing market exchange rate.
  • Borrowers put December 1st fUSDC into the pool and take out USDC to use however they wish.


Notional guarantees that lenders earn the returns they expect by ensuring that borrowers pay back their debt at maturity. Notional requires every borrower to first lock in high-quality assets like Ether and wrapped Bitcoin to act as collateral - much like how a bank might use your home as seizable collateral on a mortgage. This means, for example, that a user who wants to borrow 100 USDC will be required to hold collateral that is worth at least 150 USDC - a minimum collateralization level of 150%.

The amount of collateral that borrowers are required to hold against their debt varies based on the risk level of their collateral - DAI only requires 120% collateralization, while ETH requires 150%.


Enforcing these collateral requirements ensures that borrowers on Notional can’t simply walk away from the debts they owe. However, instead of the bank repossessing an entire home in case of a mortgage non-repayment, Notional’s liquidation process can sell, or liquidate, partial amounts, so that borrowers maintain their collateral requirements without losing all their collateral. This only becomes necessary if the value of their collateral drops below the required level due to market fluctuations.

In the unlikely event that borrowers are not liquidated quickly enough due to market volatility, Notional can use the protocol’s own reserve assets or sell its native token, the NOTE, to raise the capital necessary to make sure lenders are always made whole.

Notional is a sophisticated system, but the value proposition that it delivers is simple: Notional delivers access to secure and efficient fixed-rate loans to anyone in the world by removing financial intermediaries with the Ethereum blockchain.

Kyle Long

Head of Marketing