The Prediction Markets

Avg. # of ships transiting Bab el-Mandeb Strait end of October?

Closes
Nov 1, 2026, in 8 days
Traded
$73K
Venues
Polymarket
Prices updated
just now
Share

What the markets expect

25-29 72.4%

Next is 30-34 at 12.8%. Only Polymarket lists this market, so there is no second price to compare.

25-29 72.4%30-34 12.8%20-24 9.2%20 4.8%35+ 0.8%

Odds by venue

Fair chance strips out each venue’s built-in margin (its prices add up to more than 100%), then blends the venues by how much has traded there, so the outcomes add up to 100%. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue. Ages are as of when this page was built.

  • Polymarket
25-29
72.4%
Polymarket 71%(72.4% fair)polled, 26s agoBest Yes 72¢ on Polymarket, $100 pays $139 (1.39x)
Polymarket
Contract
25-29
Last price
71%
Fair, margin removed
72.4%
As of
Polled just now
Buy Yes
72¢
Sell Yes
70¢
$100 on Yes pays
$139 (1.39x)
Volume
$20K
Trade this on Polymarket
30-34
12.8%
Polymarket 12.5%polled, 26s agoBest Yes 13¢ on Polymarket, $100 pays $769 (7.69x)
Polymarket
Contract
30-34
Last price
12.5%
As of
Polled just now
Buy Yes
13¢
Sell Yes
12¢
$100 on Yes pays
$769 (7.69x)
Volume
$22K
Trade this on Polymarket
20-24
9.2%
Polymarket 9%polled, 26s agoBest Yes 10¢ on Polymarket, $100 pays $1,000 (10.0x)
Polymarket
Contract
20-24
Last price
9%
As of
Polled just now
Buy Yes
10¢
Sell Yes
8¢
$100 on Yes pays
$1,000 (10.0x)
Volume
$15K
Trade this on Polymarket
20
4.8%
Polymarket 4.7%polled, 26s agoBest Yes 6.4¢ on Polymarket, $100 pays $1,563 (15.6x)
Polymarket
Contract
20
Last price
4.7%
As of
Polled just now
Buy Yes
6.4¢
Sell Yes
3¢
$100 on Yes pays
$1,563 (15.6x)
Volume
$10K
Trade this on Polymarket
35+
0.8%
Polymarket 0.8%polled, 26s agoBest Yes 1¢ on Polymarket, $100 pays $10,000 (100x)
Polymarket
Contract
35+
Last price
0.8%
As of
Polled just now
Buy Yes
1¢
Sell Yes
0.6¢
$100 on Yes pays
$10,000 (100x)
Volume
$7K
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle, source: IMF PortWatch

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • 25-29
  • 30-34
  • 20-24

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Top of book

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Best bid
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Spread
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Best ask
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Depth · top 8 levels

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Recent trades

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What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

$
Buy

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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.05 × price × (1 − price) per share (other / general rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "Avg. # of ships transiting Bab el-Mandeb Strait end of October?". 25-29 leads at 72.4%. Next is 30-34 at 12.8%. $73K has traded across 5 outcomes on Polymarket. The market is expected to resolve by Nov 1, 2026.

This market will resolve according to the 7-day moving average of transit calls (“Arrivals of Ships”) for the Bab el-Mandeb Strait that IMF Portwatch reports for October 31, 2026. Transit calls include container, dry bulk, roll-on/roll-off, general cargo, and tanker ships. Ships not reported by IMF Portwatch will not be considered. This market will resolve as soon as the relevant data has been published. If the relevant data is not published within 14 calendar days of the specified date, this market will resolve based on the most recent data published up to that point. In case of obvious data integrity issues (i.e., erroneous data), the market may remain open until the end of the third calendar day (ET) after the date on which such data is first released to allow for corrections. Data integrity issues refer only to clerical or other similar errors in the underlying data, and do not include cases where IMF Portwatch differs from alternative sources. The resolution source for this market will be IMF Portwatch, specifically the transit calls data published for the Bab El-Mandeb Strait at https://portwatch.imf.org/pages/6b1814d64903461b98144a6cc25eb79c, both in the chart and through downloadable files. Where an unrounded and rounded value provided by the resolution source differ with respect to the resolution of this market, the unrounded value will be used.

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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