IEF

ETFsLive

Tokenized iShares 7-10 Year Treasury

Tokenized iShares 7-10 Year Treasury, fund-style exposure delivered as a single on-chain asset.

See IEF on /markets →Underlying ticker: IEF

Key facts

On-chain symbol
IEF
Underlying
IEF
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 IEF resolves to IEF

Each IEF on-chain represents a 1:1 claim on the underlying iShares 7-10 Year Treasury 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 IEF as a tokenized iShares 7-10 Year Treasury, 1:1 backed by the real underlying.

  2. 02

    Custody

    The underlying iShares 7-10 Year Treasury is held at Flo Finance, an institutional custodian.

  3. 03

    Settlement

    IEF 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 IEF with one SDK call

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

POST /v1/mint

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

Where IEF lives today

Flo distributes through partners. The same IEF 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 IEF 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 IEF. 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

IEF is issued by Flo Finance and 1:1 backed by real iShares 7-10 Year Treasury held at institutional custodians. Reserves are attested daily and published on the Flo transparency surface.

Open the transparency page →

Risks

IEF carries the market risk of the underlying iShares 7-10 Year Treasury, 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.