USO

ETFsLive

Tokenized United States Oil Fund

Tokenized United States Oil Fund, fund-style exposure delivered as a single on-chain asset.

See USO on /markets →Underlying ticker: USO

Key facts

On-chain symbol
USO
Underlying
USO
Asset class
ETFs
Custody
Held at Flo Finance
Chains
Base, Arbitrum, Ethereum
Distribution treatment
Total return, accrued to NAV
Attestation cadence
Daily
Issuer
Flo Finance
Backing
1:1 backed by the real underlying

How USO resolves to USO

Each USO on-chain represents a 1:1 claim on the underlying United States Oil Fund held at an institutional custodian. The issuer and backing model are the same for every Flo token; only the underlying differs.

  1. 01

    Issuance

    Flo Finance issues USO as a tokenized United States Oil Fund, 1:1 backed by the real underlying.

  2. 02

    Custody

    The underlying United States Oil Fund is held at Flo Finance, an institutional custodian.

  3. 03

    Settlement

    USO settles on-chain on Base, Arbitrum, Ethereum. Cross-chain transfers route through Chainlink CCIP.

  4. 04

    Attestation

    Reserves are attested daily by an independent auditor and published on the Flo transparency surface.

Mint USO with one SDK call

Every Flo-issued token shares the same six SDK methods. Mint, redeem, supply, withdraw, borrow, repay.

POST /v1/mint

{
  "asset": "USO",
  "notional_usdc": "1000.00",
  "slippage_bps": 50,
  "settlement": {
    "currency": "USDC",
    "chain": "base"
  }
}

Where USO lives today

Flo distributes through partners. The same USO on-chain is the asset every partner integrates against; partner UIs may relabel it for their own brand.

Partner integrations in build

No live partner is distributing USO yet. Twelve integrations are in build across exchanges, wallets, fintechs, neobanks, and asset managers. Partners are listed here only after they ship.

Audits

Four independent firms, $250K bug bounty

Sherlock, Halborn, Cantina, and Cyfrin have audited the smart contracts that issue and settle USO. The same contracts power every Flo-issued token; one audit covers the catalogue.

Read the audit reports →

Backing

1:1 backed by the real underlying

USO is issued by Flo Finance and 1:1 backed by real United States Oil Fund held at institutional custodians. Reserves are attested daily and published on the Flo transparency surface.

Open the transparency page →

Risks

USO carries the market risk of the underlying United States Oil Fund, plus the structural risks common to every tokenized asset: custody concentration, smart-contract risk, and oracle dependency. Read the full risk disclosures on the Flo transparency surface before integrating or holding.