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Flux Finance Review 2026: Lending Against Tokenized Treasuries

Flux Finance is a Compound v2 fork on Ethereum where users lend and borrow stablecoins against OUSG, a tokenized US Treasury product from Ondo Finance. It suits users who want a narrow, conservative collateral model and accept its permissioned design.

Ethereum

By the DappsAtlas editorial team · Updated Nov 4, 2026

DappsAtlas score

7.0/10

Good

Visit Flux Finance

Our verdict on Flux Finance

7.0/10

Flux Finance is a focused lending market for people who want stablecoin yield tied to tokenized US Treasuries. Its main strengths are the Compound v2 codebase, an audited permissioning layer and a narrow collateral set. The main caveat is concentration: it relies on one collateral type, OUSG, and on Ondo Finance and its underlying funds, plus its permissioned design limits who can use it. Check eligibility and current rates before depositing.

Score breakdown

How Flux Finance scores

Security: 7.5/10
Ease of use: 6.5/10
Fees: n/a
Features: 6.0/10

Scores run from 0 to 10 and are based only on facts we could verify. Where information was missing we mark the score n/a rather than guess.

What is Flux Finance?

Flux Finance is a decentralized lending platform on Ethereum that supports permissioned assets. Its homepage describes it as a place to lend and borrow stablecoins against tokenized US Treasuries. DefiLlama lists it in the Lending category since February 2023.

The design is narrow by intent. The only collateral is OUSG, a tokenized Treasury product from Ondo Finance. Flux is a fork of Compound v2, with changes limited to permissioning, which the homepage says code4rena audited.

DefiLlama shows about $43.7 million in TVL, essentially flat over the past seven days (up 0.1%). There is no native token, and governance runs through the Ondo DAO, whose ONDO holders guide the protocol's direction.

How Flux Finance works

Flux works like Compound v2. Lenders deposit stablecoins into a pool and receive fTokens that represent their share plus accrued interest. Borrowers draw stablecoins from the pool against collateral, and rates adjust with how much of the pool is in use.

The difference is the collateral. The homepage says the only accepted collateral is OUSG, a tokenized US Treasury product from Ondo Finance, which holds mostly BlackRock's BUIDL fund plus FedFund (TFDXX), bank deposits and stablecoins. Because these are permissioned assets, the Compound code was modified to handle permissioning.

Lenders can keep fTokens in their wallet or move them into other DeFi protocols. When they redeem, they get back their stablecoins plus interest.

7 features

Key features

Single Treasury collateral

OUSG, a tokenized US Treasury product from Ondo Finance, is the only accepted collateral. This keeps the risk profile narrow.

Stablecoin lending

Users supply stablecoins and receive fTokens that accrue interest and can be redeemed for the underlying stablecoins.

Composable fTokens

fTokens can be transferred and used in other protocols. The homepage cites Reserve using fUSDC and fDAI as RToken backing.

Compound v2 base

The code is a fork of Compound v2, with changes limited to permissioning, which were audited by code4rena.

Bug bounty

A $550,000 bug bounty is advertised on the homepage to encourage responsible vulnerability disclosure.

Wallet and custody options

The homepage lists MetaMask, Coinbase Wallet, Fireblocks, Ledger and Gnosis Safe as supported access routes.

Ondo DAO governance

Holders of the ONDO token guide the protocol's direction through the Ondo DAO, with a forum and governance pages linked.

Pros and cons

What we like

Built on Compound v2, a long-running lending codebase
Collateral is limited to one tokenized Treasury product, which keeps the risk profile simple
Permissioning changes were audited by code4rena, per the homepage
A $550,000 bug bounty is advertised
fTokens are transferable and usable in other DeFi protocols
Supports institutional-style access such as Fireblocks and Gnosis Safe

Watch out for

Only one collateral type (OUSG) is accepted, so the protocol depends on a single issuer and its underlying funds
Permissioned design means not every user or asset can participate freely
Runs on Ethereum only, so gas costs apply and there is no multichain access
DefiLlama lists no audits for it, and the code4rena audit named on the homepage covers only the permissioning changes
No native token, so participation in governance runs through the separate Ondo DAO
Interest rates and fee details are not published

Flux Finance fees

Flux's supply and borrow rates are shown live on the app and are not stated publicly available here. Rates on Compound-style markets vary with utilization, so check the Markets page for current figures.

The project does not list protocol fees or reserve factors. Users also pay Ethereum gas on each transaction, and any swap fees if they use a zap on a third-party venue such as Cowswap.

Is Flux Finance safe?

Flux relies on Compound v2 code, and the homepage says the permissioning changes were audited by code4rena. A $550,000 bug bounty is offered. DefiLlama lists zero audits for the project, so check the docs for the full audit reports.

Risks remain. The collateral is a tokenized asset issued by Ondo Finance and backed by funds such as BlackRock's BUIDL, so issuer, custody and regulatory risks apply on top of smart-contract risk. Governance sits with the Ondo DAO. The project does not describe any past incidents. This is not financial advice.

6 steps

How to get started with Flux Finance

1
Check that you are eligible to use Flux, since it supports permissioned assets, and read the docs for any requirements.
2
Set up a supported wallet such as MetaMask, Coinbase Wallet or a Ledger-backed wallet, and fund it with ETH for gas.
3
Open the Markets page to review supply and borrow rates and the available stablecoin markets.
4
Connect your wallet and supply stablecoins to receive fTokens.
5
If you hold OUSG and are permitted to use it, deposit it as collateral before borrowing.
6
Monitor your positions and health, and redeem fTokens when you want to withdraw.

Open Flux Finance

Who Flux Finance is for

Flux suits DeFi users, DAOs and institutions that want to lend stablecoins or borrow against tokenized Treasuries and accept a permissioned, single-collateral design. It is less suited to users who want a wide choice of collateral or open access.

Flux Finance FAQs

What is Flux Finance?

Flux Finance is a decentralized lending platform on Ethereum that supports permissioned assets. Users lend and borrow stablecoins, and the only accepted collateral is OUSG, a tokenized US Treasury from Ondo Finance.

What collateral does Flux Finance accept?

OUSG is the only collateral accepted at Flux. According to the homepage, it invests largely in the tokenized BlackRock USD Institutional Digital Liquidity Fund (BUIDL), with the rest in BlackRock's FedFund (TFDXX), bank deposits and stablecoins.

Is Flux Finance safe?

Flux is a fork of Compound v2. The homepage says changes to the Compound codebase relate only to permissioning and were audited by code4rena, and it advertises a $550,000 bug bounty. Smart-contract risk and risk from the tokenized collateral still remain.

What do I receive when I lend on Flux?

When you lend stablecoins, you receive fTokens (called fStables on the homepage) that represent your claim on the deposit plus interest. You can hold them in a wallet or use them in other DeFi protocols.

Does Flux Finance have its own token?

No. DefiLlama lists no token for Flux. The homepage says ONDO token holders guide the protocol's direction through the Ondo DAO.

Which wallets work with Flux?

The homepage lists MetaMask, Coinbase Wallet, Fireblocks, Ledger and Gnosis Safe as ways to access the protocol. The project does not describe any specific eligibility or onboarding checks.

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