Aster USDF

This review is adverse because Aster categorically excludes US users, the same pattern that led this registry to reject Solstice. USDF is a delta-neutral basis-trading stablecoin with the same structure as Ethena USDe and Solstice. Deposited USDT funds long-spot, short-perpetual positions on Binance through Ceffu custody, earning funding-rate income that stakers receive through asUSDF. Aster’s own Terms and Conditions, governed by Hong Kong law with HKIAC arbitration, explicitly prohibit use by United States residents and entities alongside a standard sanctioned-jurisdiction list. The language is nearly identical to Solstice’s own exclusion, which this registry has already rejected. No incorporated legal entity name was found anywhere in Aster’s documentation, matching the disclosure gap this registry already recorded in its Aster Bridge entry. That entry also found that DefiLlama delisted Aster’s self-reported perpetual-trading volume after it proved unverifiable and closely tracked Binance’s own figures. This matters directly because USDF’s yield depends on that same trading venue.

Review triggers: events that reopen the verdict
• A US-eligible offering opens to this registry’s target client population
• A named incorporated legal entity is disclosed for Aster
• Admin, multisig, or pause authority over the USDF and asUSDF contracts is publicly disclosed
• DefiLlama or an independent source confirms Aster’s underlying perpetual-trading volume as verifiable, resolving the wash-trading concern this registry already documented for Aster Bridge

Watched nightly: a warning on its venues or files, or a cited document that changes, reopens the memo. The first confirmation is due 2026-11-19.

The research file

Mechanism

USDF is minted 1:1 against deposited USDT. The protocol puts the deposited collateral into delta-neutral positions: long spot paired with short perpetual futures on major assets such as BTC and ETH, executed on Binance. These positions earn funding-rate and fee income instead of taking directional price exposure. Staking USDF mints asUSDF, a yield-bearing wrapper whose net asset value accrues trading profits distributed weekly. This is the same basis-trading model this registry has already reviewed for Ethena USDe, Solstice, and BitFi Basis.

The categorical US exclusion

Aster’s Terms and Conditions explicitly prohibit use by residents, citizens, or entities incorporated or located in the United States, alongside Canada, the UK, China, and standard OFAC-sanctioned jurisdictions. Aster’s documentation gives no incorporated legal entity name or jurisdiction of incorporation anywhere beyond “governed by Hong Kong law.” This is the same gap that this registry’s existing Aster Bridge entry already found. According to that entry, YZi Labs, a venture vehicle associated with Binance founder Changpeng Zhao, holds a minority stake in Aster. Zhao has said that his own role is advisory only.

Custody and control

Ceffu, the Binance-affiliated institutional custodian, holds the collateral through its MirrorX system. MirrorX mirrors a 1:1 balance to a Binance sub-account for trading while the assets remain off-exchange in Ceffu cold storage. Withdrawals from Ceffu to Binance settle T+1. Ceffu holds ISO 27001/27701 certification and SOC 2 Type 1 and 2 compliance. No disclosed source names the multisig or admin-key holder for the USDF or asUSDF minting and redemption contracts. This gap applies across every Aster product this registry has reviewed, not just USDF.

Redemption and the wash-trading concern

Direct redemption returns USDT 1:1 with a 0.1% fee. It takes 1-2 days for standard amounts and up to 7 days for large amounts, and no yield accrues during the wait. Users can instead make an instant PancakeSwap swap at the market price and accept slippage. This registry’s existing Aster Bridge entry records that DefiLlama delisted Aster’s self-reported perpetual-trading volume after finding that it tracked Binance’s own figures too closely to verify independently. That creates a direct credibility concern for USDF because its yield comes from the same trading venue, although the flagged data did not include USDF’s own TVL accounting.

Track record and comparison

Tracked TVL grew from roughly $2M at its November 2024 launch to a peak near $370.5M in October 2025, then fell roughly 70% to around $112-113M at this review. Aster’s own documentation contained audits from PeckShield and Halborn even though DefiLlama’s protocol record showed zero. Compared with Ethena USDe, which this registry covers elsewhere and which names its owner and admin multisigs and discloses a Risk Committee, USDF reveals much less about its own governance. Compared with Solstice, which this registry also rejected for a near-identical categorical US exclusion, USDF carries an extra unresolved question about the credibility of its trading venue.

Sources

The claims above trace to these. Where a number could not be independently verified, the thesis says so.

• Aster documentation — how USDF works · primary · accessed 2026-08-19
  Supports: delta-neutral mechanism, asUSDF yield wrapper
• Aster — Terms and Conditions · primary · accessed 2026-08-19
  Supports: explicit US-person and prohibited-jurisdiction exclusion, Hong Kong governing law and HKIAC arbitration, no named incorporated entity
• Aster documentation — fund custody and risk management · primary · accessed 2026-08-19
  Supports: Ceffu MirrorX custody chain
• Aster documentation — audit reports · primary · accessed 2026-08-19
  Supports: PeckShield and Halborn audit engagements for USDF and asUSDF
• DefiLlama — Aster USDF protocol data · secondary · accessed 2026-08-19
  Supports: TVL history and peak-to-current decline

Inherited controls

The research above describes the protocol layer. Every position also inherits the asset it holds and the chain it settles on. The layer with the most administrative power sets the position’s effective control; that describes control, not quality or suitability.