As of Oct 30, 2026, 9:34 AM ET, Polymarket priced this market at 71.5% (up from 67.5% 24 hours earlier). It had $538.3K traded in the past 24 hours, $5.2M of order-book liquidity and a bid-ask spread of 1.0 pts. probcast.co rates the support behind this price as strong.
Deep, easy-to-trade market — today's move came from a small group of accounts.
Source: Polymarket price history
Is the move backed by real trading and depth?
The pricing is supported by healthy trading volume and market depth, a tight spread.
Has the market settled at the new probability?
The probability moved another 2 points in the past hour — the market is still repricing.
Will the rules resolve without ambiguity?
The resolution rules are relatively specific, with a named source and a defined deadline.
Two different questions: how hard the price is to move, and whose trading set it.
How hard is it to move this price?
Order-book liquidity
$5.2M
Bid-ask spread
1.0 pts
24h volume
$538.3K
Total volume
$6.7M
It would take roughly $3.4M of buying to move the price up by ~5 pts.
Lots of money on the book and a tight spread — a single ordinary order can't move this price much.
Whose opinion is this price?
Accounts
62
Trades
200
over 2h
Largest order
$12.5K
$51.5K traded across these 200 trades (last 2h).
A small group of accounts did most of the trading — neither one whale nor a broad crowd.
From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.
This market will resolve according to the party that wins control of the United States Senate in the 2026 United States midterm election. A party wins control of the United States Senate if it wins a majority of the chamber’s voting seats.
This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.
This market will resolve according to the party that wins control of the United States Senate in the 2026 United States midterm election. A party wins control of the United States Senate if it wins a majority of the chamber’s voting seats. If no party wins a majority of voting seats, the party that wins control of the chamber is the party that wins half of the voting seats and holds the Vice Presidency. If the outcome remains ambiguous after applying the above criteria, the chamber will be deemed controlled by the party with which the first selected President Pro Tempore of the Congress that convenes after the specified election is affiliated. The following rules govern the counting of seats for determining which party wins control of the chamber. All regular and special Senate elections that determine representation in the upcoming 120th Congress and are scheduled to take place in November 2026 as of October 31, 2026 are included. Runoffs for qualifying elections will determine attribution of the relevant seat, even if they take place after November 2026. Vacant seats for which no election or special election to fill the seat is scheduled to take place in November 2026 as of October 31, 2026 will be treated as held by the party affiliation of the most recent member to hold that seat. For seats contested in the specified election, seats are attributed to the party under which the member was elected. If a member-elect changes party affiliation, or vacates their seat, between election day and the formal organization of Congress, the seat is attributed to the party under which the member was elected. For seats not contested in the specified election, seats are attributed to the party that holds the seat as of the date of the election. If a current sitting member of the U.S. Senate who is not up for election changes party affiliation or vacates their seat after the date of the election, the seat is attributed to the party under which the member was affiliated at the time of the election. Senate members elected as independents who formally caucus with, or, for newly elected members, who announce their intent to caucus with, a party are included in that party’s count. If the caucus decisions of members of the Senate elected as independents cannot be determined on the date of the election, this market may remain open until the earlier of (i) an announcement from the relevant members of their intents to caucus, or (ii) January 4th, 11:59 PM ET of the following calendar year. If no such announcement is made by January 4th, 11:59 PM ET of the following calendar year, the member will not count towards the seat count of any party. The resolution sources for this market will be official information from relevant state electoral authorities, the United States Congress, and a consensus of credible reporting.
The probability rose 4.0 percentage points over the last 24 hours (67.5% → 71.5%).
No verified catalyst has been linked to this move yet. ProbCast does not attribute moves to news without evidence connecting the timing of a specific report to the repricing.
The contract must resolve based on what has happened by this date.
Derived from the contract's own mechanics as of Oct 30, 9:48 AM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.
Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: medium · expected error ±15 pts.
A sustained one-directional drift. This can be a genuine trend or crowd herding; watch whether liquidity and breadth confirm the move.
Read the latest price with caution; conditions make it an unreliable summary right now.
Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.
Secondary read: leaning toward Reacting to news.
A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.