How a Betting Exchange Works: Back, Lay, Liability and Trading Out
The mechanics behind the blue and pink columns, with every number worked through
Updated by the 99exch.ind.in ID desk
A bookmaker sets a price and takes your bet. An exchange works differently: it is a marketplace where one person's bet is matched against another person's opposite bet. Someone who thinks India will win (a backer) is matched with someone who thinks they will not (a layer). The exchange sits in the middle, holds both sides' money, and settles when the result is in.
This post explains the mechanics using one cricket match throughout. If you only need a quick refresher on the back and lay columns, the homepage has a short version. This is the long one, including the part most beginners never learn: trading out.
Decimal odds in one line
Exchange prices are decimal odds, and they include your stake. A back of ₹1,000 at 2.50 returns ₹2,500 if it wins: your ₹1,000 back plus ₹1,500 profit. Profit is always (odds − 1) × stake. The odds also tell you the implied chance: 1 ÷ 2.50 = 0.40, so the market is pricing that outcome at about 40%. For more on reading prices, see cricket betting odds explained.
Back and lay
Take an India vs Australia Match Odds market before the toss. India show 2.50 to back (blue) and 2.52 to lay (pink).
Backing India: ₹1,000 at 2.50
- India win: profit (2.50 − 1) × ₹1,000 = +₹1,500.
- India do not win: −₹1,000.
Laying India: ₹1,000 at 2.52
Laying means you take the bookmaker's side of someone else's back bet. The ₹1,000 you type is the backer's stake you stand to win.
- India do not win: you keep the backer's stake, +₹1,000.
- India win: you pay the backer's profit, (2.52 − 1) × ₹1,000 = −₹1,520.
Liability: the number that surprises people
Your liability is the most you can lose on a bet. For a back, it is your stake. For a lay, it is (odds − 1) × stake. The panel reserves your liability from your balance the moment the bet is matched, and shows it as exposure.
| Lay bet | Calculation | Liability (amount held) |
|---|---|---|
| ₹2,000 at 1.30 | (1.30 − 1) × 2,000 | ₹600 |
| ₹1,000 at 2.52 | (2.52 − 1) × 1,000 | ₹1,520 |
| ₹500 at 4.00 | (4.00 − 1) × 500 | ₹1,500 |
| ₹1,000 at 10.00 | (10.00 − 1) × 1,000 | ₹9,000 |
Matched and unmatched bets
A bet only exists once someone takes the other side. If you ask for a better price than is on offer, your bet waits in the queue.
- You try to back India at 2.60 when the best back price is 2.50. Nobody is laying at 2.60 yet, so your bet sits unmatched. If the price moves to 2.60, it gets matched; if it does not, it stays open until you cancel it or the market closes.
- Your bet can also be partly matched. Ask to back ₹1,000 at 2.60 and if only ₹400 is available at that price, ₹400 is matched and ₹600 waits.
Unmatched bets are usually cancelled when a market is suspended or goes in-play, depending on the panel's rules. Always check your bet list for the words "matched" and "unmatched". Players regularly think they are on a bet that never actually got matched.
The spread: a quiet cost
The gap between the best back and best lay price is the spread. In our example India are 2.50 back, 2.52 lay. Suppose you back ₹1,000 at 2.50 and change your mind straight away, laying at 2.52 to get out.
- Lay stake to balance the position: ₹1,000 × 2.50 ÷ 2.52 = ₹992 (rounded).
- If India win: +₹1,500 on the back, −₹992 × 1.52 = −₹1,507.84 on the lay. Net about −₹8.
- If India do not win: −₹1,000 on the back, +₹992 on the lay. Net −₹8.
About ₹8 lost for doing nothing, purely because of the spread. In a busy international match that is small. In a thin market, such as a low-profile domestic game in the middle of the night, the spread can be many times wider, and you pay it every time you enter and exit.
Trading out: the worked example
Trading out means placing an opposite bet after the price has moved, so you lock in a result whatever happens in the match. It is the main thing an exchange lets you do that a bookmaker does not.
When the price moves your way
You backed India for ₹1,000 at 2.50 before the toss. India win the toss, bowl well, and their price shortens to 1.80 back / 1.82 lay. You now lay India at 1.82.
Equal-profit lay stake = back stake × back odds ÷ lay odds = ₹1,000 × 2.50 ÷ 1.82 = ₹1,374 (rounded from ₹1,373.63).
| Outcome | Back ₹1,000 at 2.50 | Lay ₹1,374 at 1.82 | Net |
|---|---|---|---|
| India win | +₹1,500 | −₹1,126.68 (0.82 × 1,374) | +₹373.32 |
| India do not win | −₹1,000 | +₹1,374 | +₹374 |
You have locked in roughly ₹373 whatever the result. The small difference between the two rows is only rounding.
Some players prefer to lay just the original stake instead: lay ₹1,000 at 1.82. Then if India win you get +₹1,500 − ₹820 = +₹680, and if India do not win you get −₹1,000 + ₹1,000 = ₹0. That is a free bet on India: no loss either way, with all the profit on one side.
When the price moves against you
Now the other version. India lose early wickets and drift to 3.20 back / 3.25 lay. You decide to cut the loss.
Equal lay stake = ₹1,000 × 2.50 ÷ 3.25 = ₹769 (rounded from ₹769.23).
| Outcome | Back ₹1,000 at 2.50 | Lay ₹769 at 3.25 | Net |
|---|---|---|---|
| India win | +₹1,500 | −₹1,730.25 (2.25 × 769) | −₹230.25 |
| India do not win | −₹1,000 | +₹769 | −₹231 |
You lose about ₹231 either way, instead of risking the full ₹1,000. Whether that is the right call depends on your view of the match. Trading out does not make a bad bet good; it lets you choose a smaller, certain result over an uncertain one.
Many panels have a "cash out" button that does this calculation for you. It is worth checking the figure it offers against the arithmetic above, so you know what you are accepting.
Exchange markets vs bookmaker and session markets
Not everything on an Indian exchange panel is a true exchange market. Match Odds is matched between back and lay orders. The Bookmaker market and Fancy/Session lines are priced at fixed rates set by the panel, with a built-in edge such as the one-run gap between the Yes and No lines in a session. You cannot lay and trade those in the same way. On an agent panel you also cannot see who is on the other side of a Match Odds bet. The details of each market type are in cricket betting markets explained.
Some exchanges charge commission on net winnings in a market. Whether and how much depends on the panel, so ask us before you start if it matters to your trading.
What none of this changes
Understanding the mechanics stops you making expensive mistakes, like laying an outsider without looking at the liability. It does not give you an edge over the market. The spread, the session gap and the bookmaker rate mean the average player loses over time. Bet only what you are fine losing completely. 18+ only. The Promotion and Regulation of Online Gaming Act, 2025 restricts online money games nationally and several states have their own bans. You are responsible for checking the law where you live; this is not legal advice.
Want to practise this without money? Ask for a demo ID and try a trade-out on play balance first.