The difficult part of frxUSD is not the peg. It is identifying which Frax dollar a document describes, which balance sheet backs it and which operator can honor or interrupt redemption. The same brand moved from an algorithm, to AMOs, to a segregated network of real-world reserve doors.
Legacy FRAX launched in December 2020 with a fractional-algorithmic rule: collateral and FXS absorbed different portions of minting and redemption, and the ratio could move with market price. The official V1 page now labels that mechanism retired. V2's AMOs then spread issuance and peg operations across Curve, lending markets and protocol-controlled liquidity rather than relying on one mint/redeem pool.
After FIP-188, V3 sought at least 100% exogenous collateral using AMOs, onchain loans and governance-approved real-world assets. Its documentation nevertheless called Legacy FRAX non-redeemable: a holder could not demand a particular Treasury instrument or token. Full collateralization was a balance-sheet target and price policy, not a legal delivery instruction.
FIP-419 introduced frxUSD in late 2024 and initially promised 1:1 upgrades from Legacy FRAX across named routes. The new token appeared on Ethereum in January 2025. Months later FIP-430 passed with the opposite accounting conclusion: a permanent upgrade would merge liabilities, so the DAO stopped guaranteeing 1:1 migration and split Legacy FRAX, frxUSD and sfrxUSD into separate balance sheets. Secondary-market swaps remained, but market liquidity is not issuer redemption.
Current Ethereum contracts accept USDC, USTB, BUIDL, WTGXX and USDB through separate proxies. Each door has a cap, fee and inventory; restricted Treasury tokens can demand onboarding. Frax Inc chooses custodians and reserve composition under DAO delegation, while the token-contract administrator can upgrade the token, appoint minters, pause all transfers, freeze addresses and burn balances. The promise is therefore operationally specific: one frxUSD can seek one dollar of an available approved asset through a valid route. It is not a perpetual right to select any named reserve or bypass its legal eligibility rules.
V1 combines collateral with FXS and a price-responsive collateral ratio; the mechanism is now documented as retired.
FraxPoolV3 and AMO minters move peg and liquidity operations into governance-controlled modules, later superseded by V3 mechanisms.
The original stablecoin moves toward at least 100% collateral while remaining non-redeemable for a chosen instrument.
The core team defines a separate stablecoin and an initial 1:1 upgrade route from legacy deployments.
The Snapshot vote closes with all recorded voting power in favor of separating the monetary systems and ending the DAO guarantee of 1:1 migration between Legacy FRAX and frxUSD.
The Snapshot vote closes with all recorded voting power in favor of giving Frax Inc compliance, custodian and reserve-management authority subject to a later DAO override.
Last evidence review: 2026-09-05
Frax USD, styled frxUSD, is the current reserve-backed dollar token in the Frax ecosystem. Its Ethereum deployment is the upgradeable proxy `0xCAcd6fd266aF91b8AeD52aCCc382b4e165586E29`; Fraxtal uses `0xfc00000000000000000000000000000000000001`, and official documentation lists further cross-chain forms. This page is about that asset.
Three similar labels must stay apart. The 2020 stablecoin is now Legacy Frax Dollar. The former governance token FXS was renamed FRAX and became Fraxtal gas. frxUSD is the newer payment-oriented stablecoin with a separately accounted reserve. Frax describes it as fully collateralized and fiat-redeemable, but the exact thing a user receives depends on an available custodian contract or a KYC/KYB fiat route. Holding frxUSD is not, by itself, ownership of BUIDL, USTB or another Treasury fund.
Frax's definition of a dollar changed three times. V1 combined collateral with FXS minting and burning, allowing its collateral ratio to respond to price. V2 replaced a single stabilization loop with Algorithmic Market Operations that could mint stablecoins into lending and liquidity venues and later contract supply. Those mechanisms improved reach but placed monetary operations across governance-controlled contracts.
V3 set a target of at least 100% exogenous collateral for the old stablecoin while expressly saying Legacy FRAX was not redeemable for a particular instrument. frxUSD answered a different institutional requirement: isolate reserves from that AMO balance sheet and let approved reserve conduits mint only against cash-equivalent tokens. The result is clearer accounting, but it adds regulated issuers, transfer restrictions and an operator with compliance powers.
On Ethereum, separate `FrxUSDCustodian` proxies pair frxUSD with USDC, USTB, BUIDL, WTGXX and USDB. A user deposits the specified asset and receives frxUSD, or burns frxUSD to withdraw that route's asset, after any fee. Each proxy has a mint cap, tracks what it minted and can refuse withdrawal beyond available reserves. BUIDL, USTB and WTGXX also require the receiver to be eligible to hold the underlying fund token. A route being 1:1 does not mean every route is always liquid.
The custodian contract owner can change caps, fees and approved operators. Operators may move excess reserve tokens into RWA strategies subject to a minimum balance. FIP-432 put custodian onboarding, reserve composition, KYC/KYB, attestations and fiat redemption operations under Frax Inc, with the DAO retaining authority to amend or revoke the delegation. This is not the old AMO balance sheet: FIP-430 separated Legacy FRAX and frxUSD and ended the DAO-guaranteed 1:1 migration between them.
The token layer also has compliance control. The Ethereum frxUSD proxy can be upgraded; its current implementation exposes authorized minters, global pause, address freeze/thaw and burns directed by the token-contract administrator. Cross-chain supply additionally depends on mint/burn adapters and messaging routes. These powers support regulated operation, but they mean an ERC-20 transfer is not censorship-resistant in the manner of a fixed, ownerless token.
The CoinGecko id `frax-usd` is frxUSD, the reserve-backed stablecoin at Ethereum 0xCAcd…6E29. It is not Legacy Frax Dollar at the old FRAX contract, and it is not FRAX, the governance and Fraxtal gas token formerly called FXS.
No. V1 and V2 describe historical mechanisms of the original FRAX stablecoin; V3 moved that system toward at least 100% collateral but kept it non-redeemable for a specific asset. frxUSD was deployed separately in 2025. The initial 1:1 migration promise was later ended by FIP-430.
Not through one unconditional path. Onchain users redeem through a custodian proxy for an available reserve token, subject to balance, cap, fee and any reserve-token whitelist. Fiat bank routes require FraxNet onboarding and KYC/KYB. No particular asset or custodian is always guaranteed.
The current Ethereum implementation exposes pause, freeze, thaw and minter-management functions behind an upgradeable proxy. Its privileged token-contract administrator can also direct balance burns. Use of these compliance controls depends on the current administrator and authorized roles.
The reviewed materials establish redemption mechanics against available custodian assets, not automatic shareholder status in every reserve fund. Direct receipt of a restricted fund token can require its own onboarding. Treat frxUSD as a claim exercisable through specified routes, not a universal title to a pro-rata basket.
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