Which Midterm Trades Polymarket’s Rules Permit—and Which They Block

Polymarket’s midterm election trading restrictions are not a blanket ban on election trading. The international platform blocks trading in the United States, while Polymarket US is a separate exchange with its own contracts and rules. Both platforms prohibit misuse of confidential information, knowingly using prohibited tips, and trading when you have sufficient authority or influence over the outcome—or act at the direction of someone who does.

Select your service, information source and outcome influence to identify the next restriction to check.

The August 31, 2026 report concerned Polymarket’s monitoring ahead of the midterms and greater disclosure of its integrity controls. Investigations head Shauna Bautista said the integrity program itself was not new and that the company was working to keep US users off its international platform. The report did not announce a blanket ban on midterm trading. (PYMNTS)

International Polymarket Blocks US Trading

Polymarket.com, the international service, blocks trading in the United States. Its help center lists the US among restricted countries and prohibits using VPNs or similar tools to bypass geographic restrictions. Seeing an election market does not establish permission to trade it. Readers elsewhere must also check the current country and regional restrictions. (Geographic restrictions)

Polymarket US is a separate CFTC-regulated exchange, operated by QCX LLC. Its identity and registered-exchange status also appear in a filing held by the CFTC. It has its own market-integrity rules and disciplinary procedures.

Do not assume an international midterm contract is available on the US exchange, or that the international contract’s settlement process applies there. For a US reader, the first check is the service and the specific contracts it offers—not which party looks underpriced.

Confidential Information and Outcome Influence Are Separate Tests

Both platforms’ published integrity policies prohibit three central categories:

• Misusing confidential information: trading when using information about the event would breach a preexisting duty of trust or confidence.
• Knowingly using prohibited tips: trading on confidential information passed by someone with such a duty, when you know or have reason to know they could not trade on it themselves.
• Trading with outcome influence: trading when you hold authority or influence sufficient to affect the event’s outcome, or trading at the direction of someone who does.

Lawfully creating your own research does not remove an outcome-influence restriction. Both policies also prohibit fraud and market manipulation. (International policy; US policy)

The published examples draw these distinctions for election traders:

Situation	Application of the Rules
You analyze public polling and election data yourself	Permitted original analysis of public data, subject to other restrictions.
You independently commission a custom election poll using your own methodology and questions	Both policies expressly permit this hypothetical example.
Your campaign role gives you confidential polling, and using it would breach a duty to the campaign	The confidential-information prohibition applies.
A candidate directs you to buy Yes on a market about that candidate dropping out	The US policy expressly prohibits this example because the candidate controls the outcome.

The distinction is not merely “public versus nonpublic.” The policies allow some privately created research while prohibiting misuse of information entrusted to you. Paying for your own poll is not equivalent to using an employer’s confidential poll.

The candidate-dropout example is not a complete rule for every campaign worker and every election contract. The relevant questions are what duties attach to your information and whether your authority or influence can affect the particular outcome being traded.

Polymarket US also warns that individual contracts can impose additional trading restrictions. Read the contract terms even if your information appears permissible under the general policy. If workplace obligations apply, its guidance says to check your firm’s compliance manual and department before trading. (US trading restrictions)

Midterm Settlement Can Extend Beyond Election Night

Permission to trade does not establish what a contract will pay. A market’s headline is shorthand; its resolution wording defines the outcome you are buying.

For example, the international “Balance of Power: 2026 Midterms” rules include runoffs even when they occur after November. They count independents who formally caucus, or newly elected independents who announce an intent to caucus, with a party toward that party’s total.

Unresolved independent caucus decisions can keep that market open until an announcement or January 4, 2027, at 11:59 p.m. ET. If no announcement arrives by that deadline, the member does not count toward any party’s seat total. The listed sources include state electoral authorities, Congress and a consensus of credible reporting. (Market rules)

Those are terms of this international market, not a universal settlement rule for midterm contracts or Polymarket US. Before taking a position, identify the winning condition, resolution sources, edge cases and possible settlement delay. An election-night projection may not settle the contract you bought.

A 60¢ Entry Can Require More Than a 60% Win Probability

Suppose you are eligible to trade an international election contract and have checked its exact rules. For this illustrative trade, assume Yes pays $1 if the specified outcome wins and $0 if it loses. The best Yes bid is 58¢ and the best ask is 60¢, with enough shares available at both prices. You buy 100 shares at 60¢, and the contract uses the published Politics taker-fee schedule with no rebate.

Winning and losing token values follow Polymarket’s international resolution documentation. Its Politics fee formula gives 100 × 0.04 × 0.60 × 0.40 = $0.96 for this trade, matching its fee table. These order-book prices are illustrative, not a live quote.

For the simplified calculation below, the entry fee is an additional cash cost, you retain 100 redeemable shares, and there are no other costs.

Scenario	Calculation	Result
Entry cost	$60 + $0.96	$60.96 paid
Yes wins	$100 − $60.96	$39.04 net gain
Yes loses	$0 − $60.96	$60.96 loss
Sell immediately at 58¢	$58 − $60.96	$2.96 loss before exit fee

Under those assumptions, the hold-to-resolution break-even probability is $60.96 ÷ $100 = 60.96%, not 60%. A 60¢ price is a rough market-implied probability, not proof of the outcome or your personal estimate.

The unchanged bid also shows why an immediate exit can lose money without any change in the election outlook: you bought at the ask, sell at the bid and have already paid an entry fee. Check the actual order’s fee and net share quantity rather than assuming election trading is fee-free.

Clear the Restrictions Before Assessing the Trade

Confirm platform access, information rights, outcome influence and contract-specific restrictions before placing an order. If any is unclear, pause and ask the relevant platform or compliance contact. The absence of a general-policy prohibition does not establish account eligibility or permission under an individual contract.

Then use the pre-trade reading checklist to assess resolution wording, price history, available liquidity, spread and costs.

Polymarket says it monitors trading and can take enforcement action. That is not a guarantee that every suspicious trade is detected, nor that an otherwise permitted position is financially sensible.