Stacks’ Genesis Bond is built to pay Bitcoin yield in BTC, while the bonded bitcoin stays under the holder’s own keys through a standard Bitcoin timelock. The article, written by Alea Research and translated by TechFlow, says the product is aiming for a 3% annual yield and has been paying out weekly since Sept. 17.
The idea is simple. Bitcoin, described in the piece as a $1.68 trillion asset, has never really had a native interest rate. If holders wanted yield, they usually had to lend coins out or settle for rewards paid in some other token. Genesis Bond is trying another path: principal denominated in BTC, yield paid in BTC, and no requirement to hand the underlying bitcoin over to a third party.
A Bitcoin bond that pays in BTC and keeps BTC on Bitcoin
The article sets Genesis Bond against other Bitcoin finance protocols like Core and Babylon, which pay stakers in CORE and BABY. Genesis Bond does not. It pays in BTC. And the 230.17 BTC raised by the first bond is serviced in BTC too, not in a secondary token.
Under the structure laid out in the piece, one bonded BTC goes into a six-month Bitcoin timelock and is matched with STX worth 5% of the BTC position. Smaller holders can get access through StackingDAO’s stBTC, which the article says has an estimated net BTC yield of 2.4% and does not force the user to hold STX directly.
Stacks switched on PoX-5, its Bitcoin staking upgrade, on July 30. The article says users lock BTC in a standard Bitcoin timelock, keep control of their private keys, and pair that position with STX worth at least 5% of the position value. Each bond cycle lasts about 175 days. SIP-045 supports a 3% annual target payout, sent out weekly in BTC. Holders of sBTC, the Bitcoin-backed asset on Stacks, can bond with that as well.
The piece says native bonds are the only option that lets bitcoin stay under the holder’s own keys. It also says stBTC is the only option with no STX price exposure.
At maturity, the bonded BTC comes back in full. Neither side gets slashed. If someone wants out early, a designated group of signers has to jointly approve an early BTC release. In that case, the holder loses the remaining yield, while the STX side remains locked until the original maturity date.
Where the yield comes from: miners fund it, bonds get paid first
The mechanism in the article rests on Stacks miners spending BTC to compete for the right to produce Stacks blocks. The winner gets newly minted STX block rewards and transaction fees. Under SIP-045, the block reward per Bitcoin block was restored from 500 STX to 1,000 STX, and all BTC spent by miners is directed into a reward pool.
Bonds get first claim on a 3% payout. What is left gets split: 85% to STX-only stackers and 15% into reserve. The article presents the bootstrapping phase pretty bluntly. Fresh STX issuance pays for the launch phase. Holders bear that cost through inflation, while fees are only a secondary and relatively small source of revenue for miners. It also says the network approved a separate treasury issuance in SIP-031 to fund the Stacks Endowment, which oversees the launch phase.
According to the piece, fees make up 3.5% of miners’ $18.2 million annualized revenue, and the rest comes from coinbase. Daily miner revenue moves with the STX price. Fee income, though, stayed in a tight range through the August low and the September rise.
On Oct. 1, the PoX-5 contract showed 1.90 BTC in reserve. That reserve grows during the launch phase, and SIP-045 says a consensus change is needed to use it. If miners pay less than bondholders are owed, STX-only stackers take the hit first. New bond size gets cut if coverage drops below 1.5x. If it falls below 1.0x, the protocol stops new bonds and the reserve starts covering the gap.
First month: 230.17 BTC bonded and weekly payments underway
Stacks launched Genesis Bond on Sept. 10 at Bitcoin block 966,350. Four institutions joined, according to the article: UTXO Management, Sypher Capital, 21Shares and HashKey. Muneeb Ali, who became CEO of Stacks Labs on Sept. 30, said each institutional partner used its full allocation. He said the bond rate “could become Bitcoin’s version of the federal funds rate.”
Before the bond even opened, StackingDAO’s 150 BTC pool tied to the product had already closed. Demand hit through two channels at the same time. Bond 1 in the PoX-5 contract held 230.17 BTC, split between 70.00 BTC in native Bitcoin timelocks and 160.17 BTC held as sBTC, with most of that coming through StackingDAO.
Weekly payouts began on Sept. 17. StackingDAO then updated its estimated net yield for stBTC to 2.4% after pool fees. On Sept. 24, Stacks said Anchorage Digital had become the bond custodian, and Fireblocks and Fordefi were also included.
The article also says StackingDAO held 161.20 sBTC, second only to Zest V2 among Stacks applications.
From the pool data, the PoX-5 contract recorded 4.93 BTC in the reward pool in cycle 143. Cycle 139, the last full PoX-4 cycle before the fork, paid 2.79 BTC to stackers. So the reward pool was up 77.0%.
Capacity depends on STX, and the current pool can support about 2,140 BTC of bonds
SIP-045 set the launch phase’s starting conditions at 3,000 BTC of capacity and a 3% target annual yield. The article says that number is not a hard ceiling for the first year. The Endowment sets capacity for each bond window, and Stacks plans to increase the allocation as miner bidding grows. Available size depends on miner economics, including the STX/BTC exchange rate and the coverage needed to support bond payments.
Using that initial reference size, annual bond payments come to 90 BTC. The reward pool in cycle 143 annualized to 128.2 BTC, which equals 1.4x coverage, versus 0.8x before the fork. The article says the payment and coverage math keeps the bond book at the reference size, while future allotments will be set one window at a time.
On that basis, the pool still has room for nine Genesis Bonds. Coverage on the first bond is 18.6x. Stacks set a 2.0x coverage target in SIP-045, and by that yardstick the cycle 143 pool can support about 2,140 BTC of bond capacity.
The article adds that, under the initial reference size and observed coinbase levels, annual bond payments total 90 BTC, with 32.5 BTC going to STX-only stackers and 5.7 BTC going into reserve.
It ties the larger pool to three factors. First, PoX-5 restored coinbase to 1,000 STX and, under SIP-045, sent the BTC that PoX-4 used to burn into the pool. Second, STX/BTC rose 105.5% from July 30 to Sept. 30. Third, miners bid in BTC based on the value of coinbase, which means a stronger STX/BTC rate pulls more miner BTC into the pool.
The article also gives a sensitivity readout. If the bond book stays at the initial reference size, a 30% drop in STX/BTC would push coverage down to 1.0x at the observed coinbase level, while a 40% rise would lift coverage to the 2.0x target. At the same bond size, accepted 1,000 STX coinbase can provide 1.56x coverage.
Each bonded BTC needs STX sitting beside it. That is why the article calls STX a capacity asset. The contract’s reference value for the Genesis Bond was 310,237 STX per BTC, locking 3.57 million STX in total. That equals 0.8% of the 448.3 million STX stacked in cycle 144. Under the initial reference size, the 5% STX leg would lock 34.10 million STX, or 1.8% of supply.
The key risk sits in the STX leg
The article says the main risk for bondholders comes from the STX-side position. STX closed Sept. 30 with a $695 million market capitalization, or 10.9x that of BABY, the token tied to Babylon’s Bitcoin staking protocol. STX-only stackers hold the residual claim on the pool. In the previous settlement cycle, their annualized STX return was 6.0% in BTC terms. Every bond that gets registered ahead of them increases the senior claim on that same pool.
The bond pays a 1.44% coupon over its 175-day term. The STX leg is 5% of the position and is valued in bitcoin terms at maturity. The article’s math says a 20% drop in STX/BTC cuts 1% from the total position. A 28.8% drop erases the full coupon.
It also points to longer-window history. Since October 2021, 51.8% of 1,651 overlapping 175-day windows saw STX/BTC fall by 28.8% or more.
The piece lays out two ways to remove that exposure. One: short STX in an amount equal to the STX leg. That would lock in the 1.44% return across all paths. The other: hold stBTC, which avoids the leg risk because StackingDAO pairs the bond with STX it has already stacked and keeps part of the reward. The article is clear on one point. The bitcoin itself is not reduced by an STX decline: one bonded BTC still returns one BTC at maturity.
Into the Stacks ecosystem, with a second bond window set for Oct. 10
StackingDAO’s stBTC turns the bond into collateral, the article says, and Zest, which holds most of the bitcoin inside Stacks applications, has already accepted it. Zest’s bitcoin-collateral vault went live on Sept. 23. The Stack Sats reward program also announced 1 BTC in weekly distributions to Zest and Bitflow users through Dec. 10.
Measured by coin count, bitcoin in Stacks applications rose to 1,013 by the end of September, still 18% below the May 2026 peak. The Stacks roadmap also added lending against bitcoin that remains in timelock, letting native-bond vaults borrow without moving the underlying BTC.
The second bond window is scheduled for Oct. 10. Contract terms already recorded in the article show a 3% target yield and pricing of 267,384 STX per BTC. Ali said Stacks “may release a larger Bitcoin capacity for the second bond.” Under SIP-045, about 10% of each window’s capacity goes to a public pool on a first-come, first-served basis.
The article’s takeaway is pretty direct: Stacks is trying to build BTC-funded BTC yield for Bitcoin holders while leaving the coins under their own key control. Miners fund that yield in BTC when they buy newly issued STX. One month in, the first bond has raised 230.17 BTC and weekly payouts are already happening. Starting Oct. 10, each new window is set to turn more miner BTC into yield that vaults can hold.
