Axis (USDx)

Summary

Ketju does not approve Axis USDx: the dollar token is backed by a discretionary trading book across more than forty outside venues, and Axis does not name who holds the assets. Axis states that the backing does not stay on-chain, and it calls custody and counterparty exposure the largest category of risk in its own design. A privileged operator signs every mint and redemption, sUSDx withdrawals wait through a seven-day cooldown before servicing and claim, and Axis operates no reserve fund. Axis itself says USDx is not a stablecoin and can trade away from its target. Ketju does not approve Ethena USDe, which is larger, older and better disclosed on each of these points, so it cannot approve a 26-day-old book with less disclosure. We made no finding that the strategy loses money; an advisor cannot show a client where the assets are, who holds them, or how fast they come back.

Review triggers
• Axis publishes named custodians, venue concentration, and the operator entity, with independent attestation of the off-chain collateral
• Axis demonstrates the seven-day sUSDx cooldown and redemption queue under a material cluster of redemptions without gating
• USDx sustains a material deviation from one dollar, a venue restricts withdrawals, or a redemption is delayed beyond the disclosed schedule

Ketju checks this memo every night and opens a review if its venues or files show a warning or a cited document changes. The first confirmation is due 2026-12-15.

Research

How it works

USDx is minted against supported assets when an authorized operator submits a signed order, and burned for specified assets on redemption. Axis describes the backing as digital and tokenized assets, traditional assets, and the matching futures and hedge positions. It states that USDx is over-collateralized, that it is not a stablecoin, and that it can trade above or below its target. In practice USDx works as a managed arbitrage fund issued as a transferable dollar token. Staking USDx creates an sUSDx vault position, whose exchange rate measures USDx per sUSDx and carries no market-price guarantee. The trading engine earns the return through four strategies: cross-venue arbitrage, cross-currency arbitrage, funding-rate arbitrage, and OTC or RFQ trading. Axis states that none of them is risk-free. It lists execution, liquidity, basis, FX, funding, venue, custody, counterparty and operational failure as the ways they can fail.

Who controls it

Operators hold privileged keys over issuance, redemption, staking and parameters. The risk disclosure lists key compromise, unavailability and misuse as a current risk. Minting therefore needs the operator’s permission, and a holder depends on the operator continuing to sign. The assets do not stay on-chain: Axis writes that the design depends on someone else holding or honouring something, and it calls this its largest category of risk. The documentation available on 2026-09-15 does not identify the custodians, name the venues, or name the operator entity. DefiLlama records two audits, including an OpenZeppelin review of the Coordinate v2 contracts. That review covers how the contracts behave, and it does not cover the off-chain book those contracts record.

History

DefiLlama listed Axis on 2026-08-20 and reported about $58.2M, all on Ethereum, on 2026-09-15. About $30.6M of that sat in pools with a published yield. On that date, Axis had operated in public for twenty-six days. Axis discloses no incident, and our search on 2026-09-15 of the protocol documentation, the risk disclosure and general web sources found none. For a strategy that can fail through a venue default or a withdrawal restriction, twenty-six days without an incident tells us almost nothing.

Withdrawals

sUSDx redemption happens in steps: a seven-day cooldown, then servicing, then a claim. The reserved assets stop earning vault rewards as soon as a holder requests redemption. A withdrawal therefore costs a week of yield and depends on the operator servicing the queue with assets held at outside venues. Axis states that it operates no reserve fund, so no disclosed buffer protects a holder in the queue if a venue fails to return assets. The other way out is to sell USDx in the market. Axis warns in its own risk disclosure that USDx can trade away from one dollar and that selling or redeeming may be expensive, limited or delayed.

Comparison

Ethena USDe has the same structure, and Ketju does not approve it. USDe is a synthetic dollar over an actively managed reserve, with centralized venues, off-exchange custodians, privileged mint and redeem roles, and direct redemption gated by KYC. USDe is far larger and has a published reserve fund. It met $1.9B of redemptions over 2025-10-10 and 11 without using that fund, and it still traded as low as 0.65 USDT on one venue during that event. Axis has less disclosure, no reserve fund, a shorter history and a required seven-day cooldown. If USDe does not meet Ketju’s standard, Axis cannot. For a client who wants dollar yield, the alternative is a researched cash or short-duration instrument with an obligor the holder can name.

Open questions

We could not learn which custodians hold the collateral or under what account structure. We could not learn which venues hold the positions or how much sits at any single venue. We could not learn who the operator entity is or how it divides control of the keys. We do not know whether anyone has tested the seven-day cooldown during a cluster of redemptions. We do not know whether the OpenZeppelin audit covered the accounting for operator-signed mint and redeem orders. The public documentation available on 2026-09-15 answered none of these questions.

Sources

Each claim above comes from one of these sources. Where Ketju could not verify a number, the memo states that.

• Axis: protocol documentation · primary · accessed 2026-09-15
  Supports: USDx definition, over-collateralized, not a stablecoin, operator-signed mint, sUSDx vault, four trading strategies, cooldown
• Axis: risk overview · primary · accessed 2026-09-15
  Supports: custody is the largest risk, counterparty and venue failure, privileged keys, seven-day cooldown, no reserve fund, USDx can trade away from one dollar
• OpenZeppelin: Axis Coordinate v2 contracts audit · primary · accessed 2026-09-15
  Supports: contract audit, audit scope, security review
• DefiLlama: Axis record · secondary · accessed 2026-09-15
  Supports: current TVL, Ethereum perimeter, Basis Trading category, listing date 2026-08-20, audit count

The asset and the chain

This memo covers the protocol. A position also holds an asset and settles on a chain. Whichever of the three holds the most power over the position decides who can freeze it. These tables describe control and do not judge quality.