Lock ETH for a fixed term and earn the live U.S. Treasury bill yield for that term. Your rate is written into the contract the moment you deposit. Principal and yield return to your wallet at maturity, with no lending, no leverage and no rehypothecation in the path.
Term structure
Net yield by tenor
Source: U.S. Department of the Treasury · as of —. Net of the Robills platform spread.
The mechanism
Every stage is either enforced by the contract or attested by the treasury operator. Nothing in the path depends on another protocol's solvency.
Robills reads the U.S. Treasury daily bill curve and publishes a net yield for every tenor, refreshed continuously.
off-chain feedYou pick a tenor and deposit ETH. The vault writes your rate, principal and maturity date into the position — immutable from that block onward.
on-chainCapital is swept to the KYC-verified treasury account and allocated into matching-maturity U.S. Treasury bills.
custodyAt maturity the bills redeem at par. Proceeds are funded straight back into the vault contract and the series is marked settled.
settlementPrincipal plus locked yield is claimable in a single transaction. No queue, no lockup extension, no discretionary gate.
on-chainRate board
Curve as of
—
Net APY = coupon-equivalent yield of the matching U.S. Treasury bill less the Robills platform spread. Quotes are indicative until a deposit is confirmed on-chain; the rate written into your position is the rate that settles.
Yield simulator
01 — Principal
02 — Tenor
03 — Engine trace
Payout at maturity
Sep 14, 2027 · 364 days
Principal
5.0000 ETH
Yield earned
+0.20394 ETH
Period return
4.079%
Value accrual
linear · ACT/365
Illustration only. Yield is denominated in ETH and assumes the position is held to maturity. See the risk disclosure.
Assurance
Once a position settles, its payout moves into the settlement reserve. The sweep function subtracts that reserve before calculating what the operator may move, so ETH earmarked for a claim cannot leave the contract by any path except your own withdrawal.
address(this).balance >= settlementReserveThe treasury account that buys the bills is held by an identity-verified operator, not an anonymous multisig.
Swept capital buys U.S. Treasury bills with maturities matched to your tenor. No lending desks, no perps, no farming.
Every quote is EIP-712 signed with a short expiry and a single-use nonce. The vault rejects any rate it cannot verify.
A series becomes claimable only once the contract already holds enough ETH to cover every payout in it.
Claiming is permissionless. After settlement only your wallet can move your payout, and the operator cannot reverse it.
Questions
From the U.S. Treasury's daily bill rate publication. Robills reads the coupon-equivalent yield for the bill that matches your tenor — 4-week, 13-week, 26-week or 52-week — subtracts the platform spread, and publishes the result as your net APY.
When your deposit transaction confirms, the contract stores your APY in basis points alongside your principal and maturity timestamp. Nothing — not a curve move, not the operator, not a contract upgrade — can change the payout those three numbers imply.
A position runs to maturity by design; the underlying bill does too. There is no early-redemption path in the base contract. Pick the shortest tenor if you may need the capital back sooner.
Capital sits in a KYC-verified treasury account and is deployed into Treasury bills. When the bills redeem, the proceeds are funded back into the contract and the series is marked settled, at which point every position in it becomes claimable.
In ETH. You deposit ETH and you claim ETH. The T-Bill yield sets how much ETH you get back — but ETH's own price movement against the dollar is yours, not Robills's. Read the risk disclosure before you size a position.
The contract will not mark a series claimable unless it holds enough ETH to cover the payouts. If funding is late, positions stay unsettled and the emergency refund path returns principal. Nothing is auto-rolled into a new tenor.
Robinhood Chain (chain ID 4663) — an Arbitrum Orbit L2 that posts its data to Ethereum. It has no native chain token, so gas is paid in ETH, the same asset you deposit. Any EVM wallet connects to it without modification; the app will offer to add the network for you.
Open a position
Connect a wallet, pick a tenor, lock today's rate. The rest is arithmetic the contract already knows how to finish.