Legacy Frax Dollar

Frax launched with a fractional-algorithmic design where only part of each token was backed by collateral and the rest by a governance token's market value. It has since moved to full collateralisation — a transition that is the most informative thing about it.

The fractional model, explained honestly

A portion of each stablecoin was backed by hard collateral and the remainder by the protocol's own token, with the ratio adjusting by algorithm. It worked in stable conditions and shared a structural weakness with every partially algorithmic design: the backing asset's value falls precisely when the peg is under pressure.

Why the industry abandoned the model

The 2022 collapse of a large algorithmic stablecoin destroyed tens of billions of dollars in days through exactly this reflexive mechanism. Frax moved to full collateralisation in response. Changing a core design after observing how it fails elsewhere is the correct behaviour, and it is uncommon.

An ecosystem rather than a single token

The project extends into lending, liquid staking and its own chain, with the stablecoin as the centre. That breadth means holders are exposed to more than the peg mechanism, and each component should be assessed rather than assuming the stablecoin's properties apply across all of them.

What to verify

For any collateralised stablecoin the questions are the same: what backs it, where those assets sit, who verifies them and how quickly they could be liquidated in a redemption wave. The answers are what determine whether the peg holds under stress, not the design's history.

Reading the history correctly

Frax's evolution is a case study in a protocol responding to sector-wide evidence. That is a point in its favour and it does not erase that holders of the earlier design carried a risk that later proved catastrophic elsewhere.