The Prediction Markets

Plague declared public health emergency by...?

Closes
Dec 1, 2026, in 39 days
Traded
$21K
Venues
Polymarket
Prices updated
5 min ago
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What the markets expect

December 31 2.3%

Next is November 30 at 1.7%. Only Polymarket lists this market, so there is no second price to compare.

Odds by venue

Consensus blends each venue’s last price, weighted by how much has traded there. 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, the oldest 5 min ago. Ages are as of when this page was built.

  • Polymarket
December 31
2.3%
Polymarket 2.3%polled, 5 min agoBest Yes 2.4¢ on Polymarket, $100 pays $4,167 (41.7x)
Polymarket
Contract
December 31
Last price
2.3%
As of
Polled 5 min ago
Buy Yes
2.4¢
Sell Yes
2.1¢
$100 on Yes pays
$4,167 (41.7x)
Volume
$9K
Trade this on Polymarket
November 30
1.7%
Polymarket 1.7%polled, 5 min agoBest Yes 1.8¢ on Polymarket, $100 pays $5,556 (55.6x)
Polymarket
Contract
November 30
Last price
1.7%
As of
Polled 5 min ago
Buy Yes
1.8¢
Sell Yes
1.5¢
$100 on Yes pays
$5,556 (55.6x)
Volume
$12K
Trade this on Polymarket

Who resolves this market

Polymarket
Polymarket resolves via:
UMA optimistic oracle

How the odds have moved

The top 2 outcomes on both venues, with the consensus between them. Hover for exact values.

  • December 31
  • November 30

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.

Polymarket

Open on Polymarket ↗

Top of book

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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.

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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 "Plague declared public health emergency by...?". December 31 leads at 2.3%. Next is November 30 at 1.7%. $21K has traded across 2 outcomes on Polymarket. The market is expected to resolve by Dec 1, 2026.

This market will resolve to "Yes" if the World Health Organization officially declares a Public Health Emergency of International Concern covering plague, Yersinia pestis, pneumonic plague, or any plague outbreak between market creation and the specified date, 11:59 PM ET. Otherwise, this market will resolve to "No". Only a determination that constitutes a Public Health Emergency of International Concern under the International Health Regulations will qualify. Other designations will not be considered, including the convening of an Emergency Committee, a Disease Outbreak News publication, a grade assigned under the WHO Emergency Response Framework, and a characterization of the outbreak as a pandemic. A Public Health Emergency of International Concern already in effect at market creation does not qualify; the declaration must occur between market creation and the specified date. The primary resolution source for this market will be official information from the WHO; however, a consensus of credible reporting may also 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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