What is Frax Finance?
Frax Finance is a decentralized protocol for issuing stablecoins and the DeFi ecosystem that has grown up around them. It started with a single idea — a dollar token that was only partly backed by collateral — and has since turned into a stack that covers savings, lending, trading, Ethereum staking and a blockchain of its own.
Where it came from
The project went live on 20 December 2020, built by Sam Kazemian, Travis Moore and Jason Huan. Its claim to fame was being the first fractional-algorithmic stablecoin: instead of holding a dollar of reserves for every token (fully collateralized) or holding none at all (purely algorithmic), early FRAX sat in between. Part of each token was backed by collateral, and part was held in place by an algorithm and the value of the project's second token, FXS.
That design drew a lot of attention, and a lot of scrutiny, especially after other algorithmic stablecoins collapsed in 2022. The community's answer was decisive: through a governance vote, FRAX moved to full collateral backing, ending the algorithmic experiment. The lesson the team took from the era was that a stablecoin people rely on should not depend on reflexive market confidence to hold its peg.
What it is today
Calling Frax "a stablecoin" now undersells it. The protocol is closer to a small on-chain financial system, with a handful of products that feed into each other:
- Stablecoins — a US-dollar stablecoin (branded frxUSD under the current rebrand) and FPI, a separate stablecoin pegged to a basket of consumer goods rather than to a flat dollar.
- frxETH and sfrxETH — a liquid-staking system that lets you hold a token tracking ETH and, separately, earn Ethereum staking rewards.
- Fraxlend — a permissionless lending market built from isolated pairs of assets.
- Fraxswap — the protocol's own automated market maker, with a built-in tool for executing very large trades slowly.
- Fraxtal — a layer-2 network built on the Optimism OP Stack, central to where the project is heading.
- A governance token — historically FXS, now being renamed FRAX, which carries voting power and accrues protocol value.
Each of these gets its own page in this guide. If you want the mechanics next, read how it works; if you want the token names sorted out, the token map is the place to go.
The 2025 rebrand in one line
The "North Star" plan renames the governance token FXS to FRAX (making it the gas and staking token of Fraxtal), and rebrands the original FRAX stablecoin to frxUSD. It is rolling out in stages — confirm the current state on the governance forum.
Why people use it
The honest answer is that different people use Frax for different reasons. Some hold the stablecoin as a dollar they can move on-chain. Some park stablecoins in the sFRAX vault for yield. ETH holders use frxETH to earn staking rewards while keeping a liquid token. Borrowers use Fraxlend to take a loan against collateral without going through a bank. And builders treat Fraxtal as a place to deploy applications with predictable fees.
None of that is risk-free, and this guide does not pretend otherwise. Before you act on anything, it is worth reading the risks and liquidations page and understanding how the code has been audited.