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Any specific cause confirmed 95%
Next is L3Harris at 91%. The venues differ most on Maintenance or upgrade work (Polymarket 72%, Kalshi 51%), a 21-point gap.
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. Ages are as of when this page was built.

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.
Buying on Kalshi at 77¢ and selling on Polymarket at 80¢ nets 300 bps before fees.

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.
No arbitrage: the best bid elsewhere is 64¢, at or below the cheapest ask of 73¢.

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.
No arbitrage: the best bid elsewhere is 50¢, at or below the cheapest ask of 69¢.

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.
No arbitrage: the best bid elsewhere is 48¢, at or below the cheapest ask of 52¢.

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.
No arbitrage: the best bid elsewhere is 4¢, at or below the cheapest ask of 6¢.

Labels suggest the same named outcome; no persisted outcome identity or settlement parity is verified.
Buying on Polymarket at 2.7¢ and selling on Kalshi at 4¢ nets 130 bps before fees.

Possible arbitrage before fees: buy Equipment or system failure on Kalshi at 77¢, sell on Polymarket at 80¢ (300 bps). Check the rules below before trading. See all live spreads
Summarized from each venue’s published rules; the venue’s own rules page is the final word.
The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.
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 doesn’t list Any specific cause confirmed for this event.
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Enter a stake to see where it buys the most after fees, using each venue’s live order book.
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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 0.04 × price × (1 − price) per share (politics rate). Fee calculator. Estimates only, not advice.
Live prediction market odds for "What technical failure caused the FAA's nationwide ground stop?". Any specific cause confirmed leads at 95%. Next is L3Harris at 91%. $187K has traded across 14 outcomes on Kalshi and Polymarket. The market is expected to resolve by Dec 1, 2026.
This market will resolve according to the cause or causes to which the U.S. government officially attributes the FAA's nationwide ground stop on November 13, 2026, between market creation and November 30, 2026, 11:59 PM ET. Each market will resolve to "Yes" if the U.S. government officially attributes the ground stop to the listed cause within this timeframe. Otherwise, this market will resolve to "No". More than one market may resolve to "Yes". The ground stop refers to the nationwide departure ground stop the Federal Aviation Administration (FAA) issued on November 13, 2026. A cause qualifies if it is attributed as a cause of the ground stop or of the radio, radar, communications, or other system outage behind it. The listed causes are defined as follows: Equipment or system failure: a malfunction of hardware, software, power, or telecommunications equipment used by the FAA or its contractors, including one set off by maintenance work or accidental damage. A cyberattack, jamming, or sabotage is not a failure. Maintenance or upgrade work: planned maintenance, an upgrade, a configuration change, or a cutover on an FAA or contractor system. Cable cut or physical damage: accidental damage to a cable, line, antenna, or other physical equipment, including by construction work or weather. Software or configuration error: a fault in software, or a wrong setting or configuration, in an FAA or contractor system, including one introduced by an update or upgrade. Telecom carrier or contractor fault: the failure, damage, error, or work behind the outage was in equipment, a network, or a system run by a company other than the FAA, such as a telecommunications carrier or an FAA contractor. SMART AI system: a malfunction or error in, or the deployment or rollout of, the FAA's SMART air traffic management system, including its interaction with other FAA systems. EMP: an electromagnetic pulse (EMP), including one produced by a nuclear or non-nuclear weapon or device, that disrupted or damaged electrical or electronic equipment used by the FAA or its contractors. Solar storms and other natural geomagnetic disturbances will not count. A qualifying attribution is a public statement by an authorized representative of the U.S. federal government acting in an official capacity stating that the listed cause caused the ground stop or the outage behind it. Criminal charges filed by U.S. federal prosecutors alleging that the outage was caused by a cyberattack, jamming, or sabotage will also qualify for the relevant market. Statements describing a cause as suspected, likely, probable, under investigation, or not ruled out, or stating only that the outage bears the hallmarks of or is consistent with a cause, will not qualify. A statement that the ground stop followed a communication, radio, or radar outage or issue, without saying what caused that outage, will not qualify. A cause of a different outage or ground stop will not qualify. Statements by anonymous or unnamed officials or by governments of other countries will not qualify on their own. Once a qualifying attribution is made, the relevant market will resolve to "Yes" regardless of any later retraction or the outcome of legal proceedings. The primary resolution source for this market will be official statements and publications from the U.S. government; however, a consensus of credible reporting may also be used.
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%.
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.
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.
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.
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.