Open almost any big prediction market and you will see a list of brackets. Five rate moves. Eight vote shares. Twelve price bands. The list looks precise. It often hides a simpler question with three real answers.
Collapse the brackets and the market gets easier to read. You see where the weight sits. You see which outcomes are noise. You can also check whether the prices actually add up. That is the first job of anyone trading a multi-outcome market, and it is the native shape of a Yes/No/Maybe market.
The Yes/No/Maybe mechanic, briefly
Oddup markets have three outcomes: Yes, No and Maybe. Yes and No split 90% of the pool reserve. Maybe wins 10% of the pool reserve. Maybe is a hedge, not a guaranteed win on every pool. It suits questions with a real middle state that the rules define before trading opens. Our Maybe outcome explainer covers the full mechanic.
Why venues list brackets
Bracketed markets exist for good reasons. They let traders express fine-grained views. A trader who expects a quarter-point move and one who expects a half-point move can take different positions. More brackets can also attract more liquidity, because each one is its own order book.
The cost is readability. Five brackets give you five prices, five spreads and five chances to misread the total. Most traders do not hold a view that precise. They hold a directional view with a middle: up, flat or down.
That is not a criticism of brackets. It is a reason to read them in two passes. First, collapse them into the question you actually care about. Then go back to the brackets if your view really is that precise.
A real example: the October Fed decision market
The clearest live example this week is the Federal Reserve's October meeting. The FOMC meets on 27 and 28 October 2026, per the Federal Reserve's meeting calendar.
Polymarket lists a market called "Fed Decision in October?" with five brackets. The rules define each bracket by the change in the upper bound of the target federal funds range. The resolution source is the FOMC statement after the meeting. If the rate moves by an amount not listed, the change rounds up to the nearest 25 basis points.
We pulled the market's public prices through Polymarket's read-only data at 17:10 UTC on 27 October 2026, the evening before the decision. The figures below are a snapshot. They will have moved, and the decision may already be out by the time you read this. The structure is the point.
- 50+ bps decrease: 0.05¢ (best ask 0.1¢)
- 25 bps decrease: 0.05¢ (best ask 0.1¢)
- No change: 92.7¢ (bid 92.6¢, ask 92.8¢)
- 25 bps increase: 6.5¢ (bid 6¢, ask 7¢)
- 50+ bps increase: 0.35¢ (bid 0.3¢, ask 0.4¢)
The event showed about $78.8 million in total volume and about $9.4 million in liquidity at the time. This is not a thin side market. It is one of the deepest macro questions on the venue.
Worked example: collapse, check, compare
Step 1: collapse to three outcomes. Group the brackets by direction.
- Yes, the Fed cuts: 0.05¢ + 0.05¢ = 0.1¢.
- Maybe, the Fed holds: 92.7¢.
- No, the Fed hikes: 6.5¢ + 0.35¢ = 6.85¢.
Five brackets become three outcomes. Two of the five were near zero. The real question was hold or hike.
Step 2: check the sum. The displayed prices add to 99.65¢, close to 100¢. That is what you would expect from mid-prices on a set of outcomes where exactly one must happen.
Now check the asks. Buying every bracket at its best ask would cost 0.1 + 0.1 + 92.8 + 7 + 0.4 = 100.4¢. That is slightly more than the $1 that one bracket will pay. The 0.4¢ excess is the cost of crossing every spread at once. Summed bids, by contrast, come in under 100¢. That gap between the two totals is a quick read on how tight the market is overall.
Step 3: compare with your own view. The collapsed market says hold is the base case, with a meaningful tail towards a hike and almost nothing towards a cut. A trader who agrees has no edge. A trader who thinks the hike tail is too fat, or too thin, now knows exactly which outcome to examine.
Step 4: go back to the brackets only if needed. Within the hike side, the market priced a quarter-point move far above a half-point move. If your view is "hike, but small", the bracket structure lets you say so. If your view is just "hike", the collapsed outcome is enough.
Where the middle sits matters
The Fed example has an obvious middle: no change. That is not always true. Collapsing brackets is only useful when the middle is defined by the rules, not by the reader.
Take a price-band market on a crypto asset. If the bands are 2% wide, which ones count as "flat"? The answer depends on the trader. Two people can collapse the same market into different three-way splits. That is fine for analysis. It is a problem for settlement, which is why we argue you should define the Maybe band first.
A well-built three-outcome market does the collapsing for you, in the rules, before trading opens. The Fed's "no change" bracket is a natural Maybe because the FOMC statement settles it without judgement. A vague "roughly flat" outcome is not.
It also helps to remember what the middle is not. As we covered in Maybe is not a tie, the middle outcome is its own result with its own consequences. A Fed hold is a policy decision, not an absence of one.
The rounding rule is part of the price
Bracketed markets need a rule for results that fall between brackets. Polymarket's Fed market rounds an unlisted change up to the nearest 25 basis points. A 12.5 basis point move would count as 25.
That rule matters at the edges. It decides which bracket wins in an unusual outcome. When you collapse brackets, you inherit those edge rules. A cut of any size still lands on the cut side, so the collapsed market is robust here. In other markets, an edge rule can move a result across the middle line.
The same goes for timing. This market can resolve as soon as the FOMC statement is issued. If no statement appears by the end of the next scheduled meeting, it resolves to "No change". That fallback quietly adds weight to the middle. Our piece on a market clock covers why fallbacks deserve a first read.
Brackets, binaries and one three-way market
There are three common ways to list the same question. Each one changes what a trader has to do.
The first is a set of brackets, as in the Fed market. Every bracket is its own Yes/No contract with its own order book. The trader does the collapsing and the adding up. Liquidity is split across five books, so the thin brackets can carry wide spreads relative to their price. In the snapshot, the 25 bps increase bracket had a one-cent spread on a price near seven cents. That is a large cost in percentage terms.
The second is a pair of separate binaries, such as "Will the Fed cut?" and "Will the Fed hike?". Hold is implied, not traded. The trader has to infer the middle as whatever is left over, and the two markets may not price consistently with each other.
The third is one market with three defined outcomes. Cut, hold and hike sit in one pool under one set of rules. The middle is traded directly, so its price is visible rather than inferred. There is one settlement source and one set of edge rules to read.
None of these is wrong. Brackets suit traders with precise views. Binaries suit single-direction questions. The three-way structure suits questions where the middle is the real debate, which is often the case for policy decisions, close contests and range-bound prices.
Three checks for any bracketed market
- Collapse before you read. Group the brackets into the question you actually hold a view on. Usually that is up, flat or down.
- Sum the asks and the bids. Asks summing well above 100¢ means crossing every spread is expensive. Bids summing well below 100¢ means the market is thin.
- Read the edge rules. Rounding, fallbacks and timing decide which outcome wins in unusual cases. They belong to the collapsed outcome too.
Why this matters for prediction traders
Multi-outcome markets look complicated because they are precise. Most trading views are not that precise. Collapsing the brackets aligns the market with the view you actually hold.
It also exposes the shape. In the October Fed market, five brackets reduced to one dominant middle and one meaningful tail. That is a three-outcome market in all but name. The middle outcome carried most of the weight, and the rules defined it cleanly.
That is the case for building three-outcome markets directly. When the middle is written into the rules, traders do not need to collapse anything. They can read Yes, No and Maybe as they are, and spend their time on the view instead of the arithmetic.
This article is for educational and informational purposes only. It is not financial, investment, legal or tax advice, and it does not recommend any trade or predict any policy decision. Market prices are quoted from a public snapshot at the stated time and have since changed. Prediction markets involve risk, including loss of funds. Availability and eligibility vary by jurisdiction, and some markets are restricted in some regions. Read each market's full rules and settlement source before participating. Oddup does not make price predictions or guarantee outcomes.
