Exponent Finance: How ONyc Becomes Senior, Junior and Fixed Yield
One ONyc position can become 5 different investments on Exponent: ONyc, srONyc, jrONyc, PT-srONyc and YT-srONyc. My first thought was that someone had discovered an unusually efficient way to create ticker symbols.
The structure is simpler than the names suggest. Exponent makes 2 separate cuts: senior versus junior decides who takes a loss first, while PT versus YT decides who receives principal and yield before a fixed expiry.
I previously explained how ONyc earns from reinsurance and what can make its NAV fall. This article starts from that same ONyc and focuses only on what Exponent does with it.
Start with ordinary ONyc
Holding ONyc is the unsplit position. I receive its full variable return and directly share the gains or losses of OnRe’s reinsurance portfolio.
ONyc displayed 15.38% APY when I checked on 30 August 2026. That return can change, and a large insurance claim can reduce ONyc’s NAV.
There is no Exponent expiry when I simply hold ONyc. I can continue holding it, mint it through OnRe if eligible, or sell it through available liquidity.
Every other position in this article is a derivative of that underlying ONyc. Exponent changes the distribution of its yield and losses, but it doesn’t remove the reinsurance risk beneath it.
Senior and junior decide who takes the loss first
Exponent’s tranching market accepts ONyc into 2 pools:
- srONyc, the senior or protected tranche
- jrONyc, the junior or boosted tranche
Senior holders give up part of ONyc’s return. That sacrificed yield becomes a risk premium paid to junior holders, whose capital sits underneath senior and absorbs losses first.
At the point I checked, the market showed:
| Position | Displayed APY | Role |
|---|---|---|
| ONyc | 15.38% | Unsplit underlying exposure |
| srONyc | 10.22% | Lower yield with junior protection beneath it |
| jrONyc | 30.33% | Higher yield in exchange for taking first loss |
The junior APY didn’t come from ONyc suddenly earning 30.33%. Junior received its own share of ONyc’s return, the premium surrendered by senior and active launch incentives. The app also showed 6x OnRe points and ONyc rewards for jrONyc, so the headline rate wasn’t purely reinsurance income.
Coverage tells me how much protection exists
The market showed 27.82% coverage against a 20% minimum. Coverage measures how much junior capital is available beneath senior.
More coverage gives senior a thicker buffer. As coverage becomes tight, junior protection becomes more valuable and the market can transfer a larger risk premium to junior.
The live Exponent simulation made the leverage much easier to understand:
| ONyc loss | Simulated srONyc result | Simulated jrONyc loss |
|---|---|---|
| 0% | 10.22% APY | 0% |
| 5% | Protected, 9.21% APY | 17.98% |
| 10% | Protected, 5.11% APY | 35.95% |
Those figures depend on the current coverage and market state, so they aren’t permanent promises. But they show the point: a 10% ONyc loss can become a much larger percentage loss for junior while senior remains protected.
Senior can still lose money if junior protection is exhausted. Exponent can also enter a recovery period after an ONyc NAV loss, stopping senior yield and pausing senior withdrawals while the market determines whether the loss recovers or proceeds to settlement.
Senior and junior don’t have a fixed expiry
srONyc and jrONyc are continuing tranche positions rather than dated contracts. Their APYs, coverage and share values move as ONyc performs and investors enter or leave either side.
I can normally redeem a tranche instead of waiting for a maturity date. But “normally” is doing real work there.
Senior withdrawals can pause during recovery. Junior withdrawals can be restricted when an exit would leave the market below its required protection level.
This means senior is protected from the first layer of ONyc losses, not protected from every inconvenience. The buffer can be exhausted, the APY can change and liquidity can disappear precisely when everyone wants it.
Exponent then puts an expiry on srONyc
srONyc is itself a yield-bearing asset, so Exponent can split it again through a fixed-maturity yield market:
ONyc
├── srONyc: protected senior tranche, no fixed expiry
│ ├── PT-srONyc: principal claim at 10 January 2027
│ └── YT-srONyc: srONyc yield until 10 January 2027
└── jrONyc: boosted first-loss tranche, no fixed expiry
The important detail is that PT-srONyc doesn’t mature into ONyc directly. It matures into srONyc, because srONyc is the underlying asset of this second market.
If I eventually want ONyc, the route is:
PT-srONyc → redeem at maturity for srONyc → redeem srONyc for ONyc
That extra layer preserves the senior-tranche exposure. It doesn’t bypass the tranche’s recovery, coverage or settlement rules.
Income owns the principal, Farm owns the temporary yield
The 10 January 2027 srONyc market displayed 11.82% implied APY with 133 days remaining. The underlying srONyc APY was 9.98% at that moment.
Exponent calls the principal side Income:
- I exchange srONyc for PT-srONyc at a discount.
- I give up srONyc’s variable yield until expiry.
- At maturity, 1 PT-srONyc is redeemable for 1 srONyc.
- My return comes from the discounted PT price moving to its redemption value.
The fixed APY is locked only when I hold until maturity and the contracts and underlying assets continue working. If I sell early, I receive the live market price, which can be higher or lower than what I paid.
Exponent calls the yield side Farm:
- I pay for YT-srONyc.
- YT receives the yield and eligible points produced by srONyc until expiry.
- YT has no principal claim.
- It decays toward zero and expires after the final yield period.
The page showed 25.10x effective yield exposure. That leverage doesn’t come from borrowing; it comes from paying a small amount for the yield generated by a much larger notional amount of srONyc.
With srONyc yielding 9.98% against an 11.82% implied rate, the cash yield alone was below what YT buyers were paying for. OnRe points and reward campaigns may explain some demand, but points aren’t the same as guaranteed cash and I wouldn’t value them blindly.
The 5 choices side by side
| Position | Fixed expiry | Where the return comes from | Main risk | What I end with |
|---|---|---|---|---|
| ONyc | No | Full ONyc variable return | Direct reinsurance and NAV loss | ONyc |
| srONyc | No | Reduced ONyc return | Junior buffer can be exhausted; withdrawals can pause | srONyc |
| jrONyc | No | ONyc return, senior premium and incentives | First-loss exposure and withdrawal constraints | jrONyc |
| PT-srONyc | 10 Jan 2027 | Buying future srONyc at a discount | Early-exit price and all underlying srONyc risks | Redeemable srONyc |
| YT-srONyc | 10 Jan 2027 | srONyc yield, points and rewards until expiry | Time decay; can lose most or all of purchase price | Nothing after expiry |
I would hold ONyc when I want the simplest exposure and accept its full risk. I would choose srONyc when the junior buffer is worth giving up part of the yield, and jrONyc only when the position is small enough that a multiplied loss won’t wreck my portfolio.
PT-srONyc makes sense when I want a fixed return in srONyc units and can hold until expiry. YT-srONyc is the speculative choice, suitable only when I believe realised yield and rewards will beat the implied rate by enough to compensate for its decay.
Exponent’s risk documentation adds smart-contract, oracle, integration and liquidity risk to every choice. The OnRe reinsurance risk never leaves the structure; it is merely passed around.
If I can’t tell who gave up the yield and who takes the first loss, I am probably the yield.
