Legacy Frax Dollar (FRAX) — Retail Risk Report
High risk · 2.5/10 · Wind-down asset, existing holders should exit
This report covers Legacy Frax Dollar (FRAX,
0x853d955a…1b99e), NOT frxUSD. They are separate assets with separate balance sheets and separate contracts. The 1:1 FRAX→frxUSD migration path was closed in April 2025 (FIP-430). frxUSD is Frax Finance’s current flagship; L-FRAX is deprecated.
Legacy FRAX is the original Frax stablecoin (launched Dec 2020), now in wind-down. Following the April 2025 “North Star” upgrade, Frax Finance separated the L-FRAX balance sheet from frxUSD and stopped offering the 1:1 swap that used to exit legacy holders into the successor. Today L-FRAX sits with ~$132M circulating supply, a 91% collateral ratio, a -$16M deficit, and only $24M of real (non-FRAX-denominated) backing — the rest of the “backing” is the protocol holding its own token.
| Peg | Yield | Exit | Status | Chains |
|---|---|---|---|---|
| $1 nominal (trades persistently ~$0.99) | None | Curve frxUSD/FRAX pool — $4.1M depth, frxUSD-denominated (not USDC) | Wind-down (legacy) | Ethereum + 6 chains |
Backing & solvency
L-FRAX is under-collateralized, and the realistic backing is shrinking.
| Metric | Value (June 1, 2026) |
|---|---|
| Headline collateral ratio | 90.99% |
| External-only CR (non-FRAX backing only) | 13.5% |
| Net deficit | -$16.3M |
| Circular treasury (protocol holding its own token) | 77% of “backing” |
| Real external assets | $24.4M |
The headline 91% CR moves slowly, but the External-only CR — the share of backing that is not L-FRAX, sFRAX, or Frax-ecosystem tokens — has fallen from 15.8% in March to 13.5% in June. The real external assets went from $28.6M → $24.4M in two months while supply contracted less. The deficit is widening on the axis that matters.
The on-chain CR oracle is frozen. The on-chain collateral_ratio() value reads 94.5% and has not changed since June 19, 2023 — predating the “100% CR” vote and the North Star upgrade entirely. Any protocol reading this oracle for risk parameters is consuming a 3-year-old value with no relationship to current state. The actual CR (90.99%) is 3.5 percentage points below the stale read.
There is no reserves audit. The balance sheet is on-chain and publicly visible via the live dashboard and Frax Facts, but no third-party CPA firm attests to the AMO positions, and S&P rated FRAX 5/5 (Weak) in December 2023 — the worst score among the eight stablecoins it assessed at the time.
Exit liquidity
The primary exit venue is Curve, the depth is thin, and the quote is in frxUSD, not USDC.
| Venue | Depth | Notes |
|---|---|---|
| Curve frxUSD/FRAX (Ethereum) | $4.11M total ($3.87M frxUSD, $248K FRAX) | The main price-setting pool. Most FRAX has been drained to the buy side. A $1M+ sell moves the pool meaningfully. |
| Bridged FRAX on other chains | Varies, mostly thin | Cross-chain inventory exists on Fraxtal, Arbitrum, Optimism, Polygon, BSC, Avalanche via FraxFerry. Bridging back to Ethereum to exit is the practical path. |
| CEX | None to speak of | Not a listed asset on major centralized venues. |
Exit takes two hops for USDC: FRAX → frxUSD (Curve) → USDC (further DEX route). Each hop carries slippage, and the $4.1M Curve pool is the binding constraint — exiting a sized FRAX position pushes price through that pool before reaching frxUSD, then through frxUSD’s own liquidity to reach USDC.
Practical guidance: exit in small tranches. The pool is already below the $5M depth threshold where round-trip slippage becomes material for retail-scale positions.
Peg dynamics
L-FRAX has traded at a persistent discount to par for months and has been widening in late May. Over the last 30 days (May 2 – Jun 1, 2026, 710 hourly PegTracker readings), the average price was $0.9928 (-0.72% deviation), with 92% of readings below $0.995 and 5.2% below $0.990. The week of May 25 alone had 17% of readings below $0.990 — the worst concentration since the Feb-Mar baseline window — and the latest reading on Jun 1 was $0.9908 (-0.92%). The discount is widening as the balance sheet’s external-CR slide (15.16% → 13.5% in two months) gets repriced; the peg is the market’s running estimate of real backing.
The peg is held by passive inertia, not active defense. The AMO Minter contract — the system designed to mint and deploy new FRAX into peg-stabilizing positions — has been dormant since February 2023 (3+ years). Today’s price is the equilibrium between existing legacy LP positions (about $55M in a Convex FRAX/USDe pool, $37M in a Compound borrow position, and a handful of smaller LPs) absorbing marginal trading flow. Nobody is actively rebalancing or defending the peg.
Governance has been clear about the priority. Every AMO-related proposal since mid-2025 has been frxUSD/sfrxUSD-specific (FIP-434, 437, 439, 443, 444). The only L-FRAX-touching governance is a May 2026 TempCheck for early withdrawal of inactive Convex pools — i.e. proposals about unwinding L-FRAX positions, not defending them.
Admin & multisig
The FRAX token contracts and AMO comptroller are controlled by the same Frax 3-of-5 multisig with no timelock (0xB1748C79…3f27) that runs frxUSD. The multisig is active (last transaction May 28, 2026) but its activity does not prove L-FRAX peg defense — it manages both ecosystems and the policy direction is firmly toward frxUSD.
There are no new audits of the legacy AMO stack. The original CertiK audit (Oct 2020, 39 issues — 3 critical, 8 major — all addressed) predates most current deployments.
Who it’s for · Who should avoid
For (genuinely no one in good conscience):
- Holders with existing positions that need to be exited methodically — see Exit liquidity above.
- Specialized fixed-income operators evaluating the related Frax Bonds (FXBs), which are zero-coupon claims on L-FRAX at specific future dates and trade at discounts. The wrapper isolates from new-issuance risk but inherits L-FRAX credit risk at maturity. FXBs require their own per-maturity assessment.
Avoid if (the general case):
- Looking for a stablecoin allocation. The 13.5% external-only CR and the absence of any active peg defense mean L-FRAX should not be treated as a $1-pegged asset in any sized position.
- Holding L-FRAX as collateral inside a third-party protocol that reads the on-chain CR oracle. The oracle is frozen at 94.5% from June 2023 — your protocol may be using a value that overstates actual collateralization by ~3.5 percentage points.
- Considering FRAX as a frxUSD substitute. They are different assets; the 1:1 migration is closed.
What to watch
- External-only CR. Currently 13.5% and falling (about $1.5M/month of external assets disappearing). If it drops another $5M without supply contraction, the realistic backing position becomes meaningfully worse.
- Curve frxUSD/FRAX pool depth. Live on the dashboard. If pool depth drops below $3M, exit liquidity is in a different regime.
- Comptroller multisig activity. Track the comptroller address for sudden large withdrawals from the Convex FRAX/USDe position (~$55M) or the Curve frxUSD/FRAX LP — those are the legacy peg-support positions, and there’s no governance lock preventing their reallocation to frxUSD.
- Governance proposals touching L-FRAX. The May 2026 TempCheck for early Convex pool withdrawal is the only L-FRAX-touching governance currently in motion. Any FIP proposing further balance-sheet separation or accelerated wind-down would be material.
- Compound AMO leverage. $20M USDT borrowed against $37M sFRAX collateral. The position has been steady for 2 months; a sudden change (forced unwind, liquidation pressure) would worsen the deficit.
A note on Frax Bonds (FXBs)
L-FRAX has a related instrument worth disambiguating: FXBs (Frax Bonds) are zero-coupon ERC-20 tokens that redeem for exactly 1 L-FRAX at specific future dates (2026-12-31, 2027-12-31, 2029-12-31, 2055-12-31). The L-FRAX collateral is locked inside each FXB contract at mint, so redemption is contract-guaranteed for already-issued FXBs — but the asset you receive at maturity is L-FRAX, with all of the risk described above. FXBs trade at discounts that price in the L-FRAX trajectory. They are a separate decision from holding L-FRAX directly; the per-maturity dynamics matter.
This report describes Legacy FRAX as of June 1, 2026. Live balance sheet, CR, AMO positions, and Curve pool depth are on the live dashboard. Frax Finance has not engaged on this report; figures are sourced from on-chain reads, the Frax Facts API, and the Frax governance forum. Corrections welcome at info@tidresearch.com.