Past a certain price, the legs stop paying

A ceiling does not shorten a bet - it cuts a horizontal line through the price. Below the line the price pays exactly as quoted; above it the return is flat while the probability keeps falling. This page draws the line and works out what sits above it.

Open the partner account Start with the price you were shown

In the rules: a maximum payout, a cap per day, a market liability limitPaid as priced: everything below the ceilingPaid at the cap: everything the ceiling was drawn through

Direct answerA ceiling converts into a maximum usable price: the cap divided by the stake. A 10,000.00 cap on a 1.00 stake means no combined price above 10,000.0 can be paid, so every leg that pushes a slip past that figure is quoted, settled and unpaid. The reader's probability keeps falling with each added leg while the payable amount stays flat, which is why the marginal value of a long bet's last legs is exactly zero.

Cap: 10,000.00 per betStake: 1.00Maximum usable price: 10,000.0Legs above the line: unpaid

The line, drawn once

cap ÷ stake Three facts produce the whole mechanism. A price is a multiplier: stake times price is the return. A cap is a fixed ceiling: the return cannot exceed it. Put together, the longest price that can be paid is the cap divided by the stake - and that number has nothing to do with how likely the bet is. It is a property of the reader's stake, not of the selections.

So the same fifteen selections are, in order, a bet worth 750,000.0 to a reader staking 0.01, and a bet worth 10,000.0 to a reader staking 1.00. Nothing about the selections changed. The ceiling made the stake the deciding variable.

Worked example - the last leg pays nothing (illustrative) Nine legs produce a combined price of 1,500.0 on a stake of 1.00. Return: 1,500.00, paid in full. A tenth leg priced at 8.00 takes the combined price to 12,000.0. Return if paid as quoted: 12,000.00. Return payable under a 10,000.00 ceiling: 10,000.00. The tenth leg therefore contributed 2,000.00 of price and 0.00 of payout - and it still contributed its own risk: the whole bet now needs ten outcomes instead of nine, so the probability of being paid at all is lower than it was before the leg was added. Reduce the stake to 0.25 and the same ten legs pay 3,000.00 in full - under the ceiling, and worth a quarter of the money for a quarter of the stake. The ceiling did not change; the relationship between stake and ceiling did.

The truncation, stated as a distribution

Every bet has a range of possible returns and a probability attached to each. A ceiling removes everything above one value and moves it down to that value. This does three things at once, and all three are worth understanding separately.

It flattens the top. Above the line, outcomes that used to be worth very different amounts all return the same figure. A reader is paying for a spread of long-odds outcomes and receiving one of them.
worth more than its price It raises the average. Truncation moves probability mass down to the cap, so the expected return of the capped bet is higher than the expected return of the same bet priced honestly at the long odds - because the honest price of a 1-in-750,000 shot is a 750,000.0 payout, and the cap pays 10,000.0 for it. The bet is now better value than its true price, which is exactly why operators are content to keep offering it.
the top of the range It makes the price you were shown a fiction in its top decile. The number on the slip is the price of a bet that would be paid in full. It is not the price of the bet the reader is holding.

Worked example - the cap as a share of the price (illustrative) A fifteen-leg slip at a combined price of 750,000.0 on a stake of 1.00, under a 10,000.00 ceiling. The ceiling as a share of the price: 10,000 ÷ 750,000 = 1.33%. So 98.67% of the advertised return is a figure that cannot be paid, and the reader's own probability of collecting is the probability of a 750,000.0 outcome. For comparison, on a nine-leg slip at 1,500.0 the same ceiling is 667% of the price - irrelevant, and the bet is paid as quoted. The ceiling only becomes part of the price somewhere in the middle of a slip, and nothing on the slip marks where.

The three things a reader can actually check

The cap, in the rules. It is published as a figure in the betting rules, and the small print page sets out where to find it and how to tell which version applies.
The stake against the cap. Dividing one by the other gives the longest price the bet can pay. That is the only arithmetic needed, and it is two keystrokes.
The price at which the ceiling is crossed. Multiplying the combined price of the legs as they are added shows the rung at which the slip stops paying. Every leg after that rung is a leg the reader has taken on without being paid for it.

What this is not

It is not a claim that a capped bet is unfair, and not a suggestion about what to bet on. A published maximum payout is a disclosed limit; the information problem is not that it is secret, it is that it does not appear where the price appears. It is also not the same subject as the value of a price itself - whether a price is generous given the probability is the value desk, and this page assumes the price is whatever it is before the ceiling is applied.