People to Wait
The YES side bleeds a little every day. The NO side collects rent.
Here's the math.
THE CLOSING LINE
JUN 10, 2026
Kalshi has a series of markets live right now asking whether the U.S.
government will confirm that aliens exist — split into multiple deadlines.
The headlines focus on the long-dated bets, but the short-dated ones
are where the time decay math gets sharp.
Two markets, side by side, as of June 10, 2026
Before July 1, 2026 20 days out): YES 2¢ / NO 99¢
Before September 1, 2026 82 days out): YES 6¢ / NO 95¢
The series has done over $25 million in total volume. People are clearly
buying this. And on the surface, the YES side is the fun trade — a few-
cent lottery ticket on the most paradigm-shifting announcement in
human history. If it hits, every contract pays a dollar. A 50x return on
the July market. A 16x return on the September market.
But there’s something nobody’s running the numbers on. Every single
day either of these markets stays open without aliens being
confirmed, the YES holder loses a little money and the NO holder
gains a little money. Predictably. Mechanically. Like a tiny interest
payment going from one side of the trade to the other.
The math is more interesting than the bet itself.
Think about what these contracts have to do over the next few months.
If aliens don’t get confirmed, every YES contract is worth exactly $0.00
at expiration. Every NO contract is worth exactly $1.00. Today, they’re
priced at the levels above. Both contracts have to “walk” to their final
value over the next 20 or 82 days, depending on which market you’re
in.
That walk happens slowly. Every day that passes without an alien
announcement, the YES contract loses a tiny sliver of value and the NO
contract gains a tiny sliver. It’s the same dynamic as an option
approaching expiration — what traders call theta, or time decay.
The shorter the timeframe, the more concentrated the decay. That’s why
the July 2026 market is priced at 2¢ and the September 2026 market is
priced at 6¢. More days remaining = more chances something
happens = higher YES price. As days come off the clock, the YES price
has to drop. There’s no other direction it can go without news.
Let’s run the actual numbers on a $1,000 YES position in the Before
September 2026 market at 6¢.
How time decay actually works here
What it costs to hold YES on the
September market, per day
$1,000 ÷ 6¢ per contract = 16,667 YES contracts
If aliens aren’t confirmed by September 1, 2026, all 16,667
contracts expire worthless
Total loss if “no alien” outcome: $1,000 (the full position)
Days until expiration: 82
Average daily decay: $1,000 ÷ 82 ≈ $12.20 per day
Read that again. About $12.20 per day per $1,000 staked. That’s what
you’re paying to hold the YES side of this trade, every single calendar
day, while you wait for an announcement that, by the market’s own
pricing, has only a 6% chance of happening.
A week without news? You’re down about $85. Two weeks? Down $170.
A full month? Down $365. Two months and you’re effectively wiped out
— and you still have to be right about an event the market itself says is
overwhelmingly unlikely.
The July market is even more brutal. With $1,000 staked at 2¢, you
control 50,000 contracts, but you only have 20 days until they expire
worthless. Daily decay: $50 per day per $1,000.
This is the slow bleed almost no retail trader thinks about when they
buy a “cheap” lottery ticket. They see a high upside if they’re right. They
don’t see the guaranteed daily loss if they’re wrong — and “wrong” is
the default outcome.
Now flip it. Same $1,000, on the NO side of the September market at
95¢.
$1,000 ÷ 95¢ per contract = 1,052 NO contracts
If aliens aren’t confirmed, each contract pays $1.00 at expiration
What you earn on the NO side, per day
Total payout: 1,052 × $1.00 = $1,052
Profit if held to expiration: $1,052 – $1,000 = $52
Days until expiration: 82
Average daily theta gain: $52 ÷ 82 ≈ $0.63 per day
Sixty-three cents a day. On $1,000. Doesn’t sound like much. But
annualize it — that’s roughly 23% per year if you can keep rolling the
trade. That’s better than essentially every “safe” yield you can find in
U.S. financial markets right now, including treasury bills 5%, high-
yield savings 4%, and most corporate bonds.
You’re not getting rich. You’re being paid steadily to take a small
probability of getting wiped out by an alien press conference. The
market is offering you that trade. Most retail traders don’t take it
because the absolute dollar number per day looks too small to bother
with.
Let’s actually walk through what holding the YES side of the September
2026 market looks like, day by day. $1,000 in at 6¢. 16,667 contracts.
82 days until expiration.
Day 1 Open the app. Position worth $988. You’re down $12.
Day 2 Position worth $976. Down $24.
Day 7 (one week): Position worth $915. Down $85.
Day 14 (two weeks): Position worth $830. Down $170.
Day 30 (one month): Position worth $635. Down $365.
Day 60 (two months): Position worth $268. Down $732.
Day 82 (expiration): Position worth $0. Down the full $1,000.
The trade in plain English — day by day
That’s what the calendar does to you if nothing happens. And from the
market’s own pricing, nothing happening is the 94% likely outcome.
You’re paying real money every single morning for a 6% chance that
gets smaller every day you don’t get news.
Now the same $1,000 on the NO side at 95¢
Day 1 Position worth $1,000.60. Up 60 cents.
Day 7 Position worth $1,004.40. Up $4.40.
Day 14 Position worth $1,008.80. Up $8.80.
Day 30 Position worth $1,019. Up $19.
Day 60 Position worth $1,038. Up $38.
Day 82 (expiration): Position worth $1,052. Up the full $52.
Slow. Boring. Steady. But every day moves in one direction — yours —
unless something dramatic happens.
If you’ve ever traded options, the structure of this trade should look
extremely familiar. Time decay on a binary prediction market contract
works almost identically to time decay on a stock option, with one
important difference.
A typical at-the-money option on a major stock — say, a 30-day SPY
call — loses somewhere around 35% of its premium per day in theta
near expiration. A $500 option might lose $1525 in time value per
trading day if the underlying doesn’t move. That decay accelerates as
expiration approaches. The closer to expiry, the steeper the daily losses
for the option buyer.
The YES contract on the September aliens market is doing the same
thing, except:
How this compares to stock option theta
- The decay is more predictable. A stock option’s value is driven by
both time decay and stock price movement. The Kalshi YES contract is
driven almost entirely by time decay, because the underlying event
(alien confirmation) is binary and doesn’t move minute-to-minute.
There’s no equivalent to “the stock went up so the option recovered.”
Either aliens get confirmed or they don’t.
- The total decay is capped at the premium paid. Stock options can
lose value in chunks if the stock crashes. The YES contract can only
ever go to zero — and 6¢ is already most of the way there.
- The decay path is closer to linear. Stock option theta is curved
(accelerating into expiration). Binary contract decay, in the absence of
news, is roughly linear over the life of the contract — though it can
lump up around catalyst dates.
Selling YES on Kalshi is, in effect, the cleanest possible version of
selling premium. No earnings reports to worry about. No volatility
crush. No gamma risk. Just a contract that, every day no news arrives,
ticks one day closer to paying you the full dollar.
That’s the trade. It’s just a prediction market wrapper around a strategy
options traders have been running since the 1970s.
If this looks too good — a 23% annualized yield that just keeps
collecting — there are real reasons the price stays where it is.
Capital lockup. Your $1,000 is tied up until the market expires. You can
sell mid-trade on Kalshi if you change your mind, but you’ll typically eat
a spread doing it. The “yield” only fully materializes if you hold to
expiration.
Why the price hasn’t already fixed itself
Tail risk is real, even if small. That 6% probability the market is pricing
isn’t zero. If a senator holds a press conference next Tuesday with what
they claim is recovered non-human biological evidence, your NO
contract crashes to zero overnight. The 23% annualized yield assumes
nothing happens. The whole point of the price is that something might.
Liquidity matters. Short-dated NO contracts at 95¢ don’t have
unlimited depth. If you try to put on a massive position, you’ll move the
price against yourself. The trade scales until it doesn’t.
If you genuinely believe the probability of U.S. alien confirmation by
September 2026 is less than 6%, the NO side is positive expected value.
If you think it’s higher, the YES side is.
Most retail bettors look at a 6-cent YES contract and think “cheap
lottery ticket.” They don’t think “I’m paying $12 a day for the privilege of
holding this.”
Most retail bettors look at a 95-cent NO contract and think “boring, low
upside, why bother.” They don’t think “I’m collecting 63 cents of theta
per day for almost three months, on a position the market itself says is
94% likely to win.”
The math is identical to selling options, running a sportsbook, or being
the house at any casino. The high-probability side gets a slow, steady
drip of small wins. The low-probability side gets the occasional big
payout, but only after eating a lot of small losses in between.
The aliens market is just the cleanest possible example because the
question — will the U.S. government confirm aliens exist by [date]? — is
binary, well-defined, and has no plausible reason to resolve YES on
most days.
The bigger lesson
The YES holder is paying for excitement. The NO holder is being paid to
be patient.
Almost everywhere you look in prediction markets, that’s the trade.
Live prices as of June 10, 2026: Before July 2026 at 2¢ YES / 99¢ NO, Before
September 2026 at 6¢ YES / 95¢ NO, Before 2027 at 13.3¢ YES / 87¢ NO,
Before 2028 at 20¢ YES / 81¢ NO, Before Jan 20, 2029 at 26¢ YES / 75¢ NO.
The article math assumes you hold to expiration; partial holds yield
proportional fractions of the total. The daily decay path is a linear
approximation — actual daily price changes will vary based on news, volume,
and liquidity
.