Top of book
ConnectingWaiting for the first live quote…
Yes 54%
Only Polymarket lists this market, so there is no second price to compare.
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.

The leading outcome on both venues, with the consensus between them. Hover for exact values.
Each venue’s resting orders for the Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.
Waiting for the first live quote…
Enter a stake to see where it buys the most after fees, using each venue’s live order book.
Loading both order books…
Loading every outcome’s book…
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 "Supreme Court lets parents sue over Washington trans law?". Yes leads at 54%. $2K has traded across 1 outcome on Polymarket. The market is expected to resolve by Aug 1, 2027.
International Partners for Ethical Care, Inc. v. Ferguson (No. 25-840) is a challenge by a group of parents to Washington State laws that allow youth shelters to withhold notice to parents when a minor is seeking gender-affirming care. The United States Court of Appeals for the Ninth Circuit held that the parents lack standing to bring the challenge. This market will resolve to "Yes" if, on or before July 31, 2027, 11:59 PM ET, the Supreme Court of the United States issues an opinion, per curiam decision, or judgment in International Partners for Ethical Care, Inc. v. Ferguson or any consolidated case that holds that at least one petitioner has standing to bring at least one of the challenged claims referenced in this case. Otherwise, this market will resolve to "No". A qualifying holding will count regardless of whether the Court reverses or vacates the judgment of the Ninth Circuit, remands for further proceedings, or decides the merits of the petitioners' claims, and regardless of how the Court rules on those merits. Where the Court issues a plurality opinion or a fractured decision, this market will resolve based on the Court's judgment: a judgment that reverses or vacates the Ninth Circuit's determination that the petitioners lack standing, as to at least one petitioner, will qualify. This market will immediately resolve to "No" if the Court affirms the judgment that the petitioners lack standing, including on alternative grounds, or if the case and any consolidated case are terminated without a qualifying holding, including by a dismissal as improvidently granted, a vacatur for mootness or other non-merits vacatur or remand that does not rest on a holding that a petitioner has standing, a settlement, a voluntary dismissal, or any other termination without a qualifying holding. If no qualifying ruling has been issued by July 31, 2027, 11:59 PM ET, including because the case remains undecided or has been set for re-argument, this market will resolve to "No". Resolution will be based on the Court's opinion or judgment as announced; a subsequent petition for rehearing will not delay or alter resolution. The resolution source for this market will be official information from the Supreme Court of the United States.
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.