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Kalshi and Polymarket let traders buy and sell contracts whose settlement depends on a real-world event, but they are not the same venue. Kalshi is a U.S. Commodity Futures Trading Commission (CFTC)-designated contract market. Polymarket has two distinct services: Polymarket International, a blockchain-based, non-custodial market unavailable to U.S. users, and Polymarket US, which its transparency materials describe as a CFTC-designated contract market with regulated clearing and identity checks.
Your choice therefore starts with eligibility and legal framework, not with which homepage shows the more attractive election number. Compare the exact service, contract rules, settlement source, custody model, liquidity, fees, tax treatment and dispute process before committing any money.
Kalshi and Polymarket at a glance
| Question | Kalshi | Polymarket International | Polymarket US |
|---|---|---|---|
| What is it? | A CFTC-designated contract market offering event contracts. | A separate blockchain-based international service. | A separate service described by Polymarket as a CFTC-designated contract market. |
| U.S. access | Subject to Kalshi’s eligibility and applicable rules. | Unavailable to U.S. users. | Eligibility depends on the service’s onboarding requirements and applicable U.S. rules. |
| Custody | Regulated clearing and customer due-diligence processes apply to the exchange framework. | Non-custodial: users control private keys and collateral is held in smart contracts. | Uses the regulated clearing framework described for the U.S. service. |
| Record of trades | Exchange records and regulatory surveillance. | Public blockchain records described as on-chain, immutable and auditable. | Exchange records, rulebook controls and regulatory surveillance. |
| Primary decision | Read the contract rulebook, fees and eligibility terms. | Confirm your jurisdiction, wallet security, smart-contract risks and resolution rules. | Confirm that you are using the U.S. service, then read its rulebook and clearing disclosures. |
These labels describe the platform structures identified in the available materials; they do not guarantee that a particular contract is liquid, profitable or available to every resident.
How an election prediction contract works
A typical contract has a yes/no outcome. You buy a “Yes” or “No” position at a market price, and the contract pays according to the specified outcome at settlement. A price can be read as the crowd’s implied probability—for example, a 62-cent “Yes” contract suggests roughly 62% before considering fees, spreads and market frictions—but it is not a guaranteed probability or an official forecast.
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The CFTC explains that customers can trade in and out before settlement at the current market price. If the market moves in your favor, you may close early; if it moves against you, you may exit for less than you paid. Holding to settlement exposes you to the contract’s final determination, while exiting exposes you to available bids and offers at that moment.
Settlement is controlled by the contract’s written rules. Those rules should identify:
- the precise event being measured;
- the deadline or observation window;
- the authoritative data source;
- what happens if the source is delayed, corrected or unavailable;
- the payout amount and timing;
- the process for disputes, appeals or rule changes; and
- trading hours, pauses and expiration conditions.
Two contracts that appear to ask the same election question can therefore settle differently. One might require a specific official certification; another might use a named news or government source at a stated time. Compare the wording rather than relying on the market title.
Eligibility and geography: identify the exact service first
Kalshi
Kalshi operates within the U.S. derivatives framework as a CFTC-designated contract market. The CFTC says federally regulated prediction markets can operate in all 50 states under federal law, subject to applicable rules and customer qualification. That statement does not remove onboarding checks, product restrictions, state-level disputes or the possibility that a particular user or contract is ineligible.
Polymarket International
Polymarket International is described as unavailable to U.S. users. It is a non-custodial, blockchain-based service: users hold their own private keys and collateral sits in smart contracts. Restricted-jurisdiction rules matter even if a website is technically reachable. Do not attempt to bypass geographic controls with a VPN or another device-location workaround; doing so can conflict with the platform’s terms and may complicate withdrawals or dispute resolution.
Polymarket US
Polymarket’s transparency materials describe Polymarket US separately as a CFTC-designated contract market with regulated clearing, identity verification and a published rulebook. Treat it as a distinct service from Polymarket International. Account, custody, contract availability and settlement procedures should be checked in the U.S. service’s own disclosures.
Why the brand name is not enough
“Polymarket” can refer to two materially different legal and technical environments. Before depositing, verify the service name shown during onboarding, the entity accepting your account, the governing rulebook, the permitted country or state and the withdrawal method. A comparison that treats Polymarket as one undifferentiated product can give a U.S. reader the wrong answer.
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Regulation and the continuing legal debate
The CFTC has regulated U.S. prediction markets since 2004. Its timeline identifies the Iowa Presidential Stock Market, created in 1988, as the first modern U.S. prediction market. In 2004 the agency approved Hedge Street as the first designated contract market offering binary options. These milestones explain why a binary event contract can be structured as a regulated financial product rather than simply a casual wager.
Kalshi’s election-contract dispute with the CFTC reached federal court. The D.C. Circuit record describes the agency’s concerns that election contracts could create incentives to influence voting or spread misinformation. The court concluded that the evidence before it did not rise above the speculative level required for the requested stay. That procedural decision did not settle every policy or jurisdiction question surrounding election markets.
The same record says Polymarket became operational in 2020 and was not registered as a designated market at that time. A CFTC enforcement action later imposed a $1.4 million fine on Polymarket for operating an unregistered platform and required blocking U.S. users, according to a 2026 Bipartisan Policy Center summary. That historical action is one reason the international and U.S. services must not be conflated.
The dispute remains active at the state level. In a release dated April 28, 2026, the CFTC said it sued Wisconsin to reaffirm federal jurisdiction after Wisconsin sued Kalshi, Polymarket, Crypto.com, Robinhood and Coinbase. Federal market access therefore does not mean that all state litigation, product challenges or future rule changes have ended.
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Custody, collateral and what happens to your money
Regulated clearing on Kalshi and Polymarket US
The regulated services describe clearing and customer-identification controls. You generally interact through an account subject to identity verification, eligibility checks, exchange rules and a clearing process. Those controls can provide a clearer framework for statements, withdrawals, surveillance and complaints, but they do not prevent trading losses, market outages or an adverse settlement.
Self-custody on Polymarket International
On Polymarket International, the user is responsible for the private keys controlling the wallet. Collateral is held by smart contracts rather than by a traditional broker holding an account balance for you. Losing a key, signing a malicious transaction or sending funds to the wrong address can create problems that a conventional account-recovery process may not solve. Blockchain visibility also does not eliminate software, oracle, wallet or network risk.
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Questions to answer before funding
- Who legally holds or controls the collateral?
- Which asset is required, and how is its value determined?
- What network and address format are required for deposits and withdrawals?
- Are withdrawals immediate, queued or subject to review?
- What happens if the platform, clearing entity, wallet or smart contract is unavailable?
- Which records will you receive for accounting and taxes?
Settlement rules decide the result
Election language is often less precise than it looks. “Who wins?” could mean the projected winner on election night, the winner certified by a state authority, the winner of the Electoral College, or the person inaugurated after legal challenges. A market may also specify a date by which the result must be known. Read the resolution source and timing before comparing prices.
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Pay particular attention to edge cases: recounts, contingent elections, certification delays, court orders, withdrawals, invalid ballots, ties and a source that later corrects its data. The contract’s rulebook—not a social-media consensus—controls settlement. Save a copy or timestamped record of the rules that applied when you traded, because a rulebook version can matter in a later dispute.
Settlement value is different from the price at which you entered. A contract purchased at 40 cents may settle at its stated payout if “Yes” occurs, or at zero if “No” occurs, but the exact payout, fees and timing are contract-specific. Never infer a universal dollar amount from a market’s display without reading its terms.
Liquidity and exiting before election day
The CFTC notes that customers may trade out before settlement. In practice, your ability to exit depends on the contract’s order book, spread, trading hours, market pauses and the size of your order. A highly visible election market may still have thin liquidity at a particular price or during a news shock.
Use the order book rather than the headline quote. Check the best bid and offer, the quantity available at each level and the estimated fill price for your entire order. A displayed midpoint is not the same as an executable price. Large market orders can move the price, and a limit order may remain unfilled while the event develops.
Liquidity risk has two sides:
- Exit risk: you may be unable to close near the price shown on screen.
- Settlement risk: you may hold until the result, then wait for the platform’s determination and payout process.
Consider both when deciding how much risk capital to commit. The CFTC specifically advises customers to use only money they can afford to lose.
Transparency, surveillance and information quality
Public blockchain records
Polymarket International describes its trading record as “transparent, public, and permanent,” with records “on-chain, immutable, and auditable by anyone, in real time, and forever.” Public records let observers inspect transactions and market history without relying solely on a private database. They can also expose wallet activity permanently, so users should understand the privacy implications of linking a wallet to an identity.
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Regulated exchange records
Kalshi and Polymarket US rely on exchange surveillance, customer-protection rules and CFTC/National Futures Association oversight within their regulatory framework. Surveillance can detect prohibited trading patterns and enforce market rules, but it is not a promise that every forecast is accurate or that every dispute will be resolved in your favor.
Why transparency is not the same as accuracy
A visible trade ledger tells you what participants did, not whether their collective estimate was correct. Election prices can move on polls, endorsements, turnout expectations, legal developments or simple order imbalances. Use the contract’s methodology and source documents to evaluate what the price actually represents.
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There is no single “Kalshi fee” or “Polymarket fee” that applies to every contract and service. Before placing an order, identify the commission or transaction charge, bid-ask spread, deposit and withdrawal cost, network fee where applicable, settlement charge and any penalty for a rejected or canceled transaction. The CFTC tells customers to seek clear information about risks, obligations, commissions, fees, penalties and other trading costs.
Compare the all-in cost for the trade you intend to make. A lower stated commission can be outweighed by a wider spread or an expensive withdrawal. For blockchain trading, include the network fee and the cost of converting assets. For a regulated account, check whether the displayed balance, available cash and settled funds are treated differently for withdrawals.
U.S. tax classification remains unresolved for prediction-market activity. The Bipartisan Policy Center has described open questions about how these contracts should be classified. Keep complete records of deposits, purchases, sales, settlements, fees, wallet transfers and exchange statements, and ask a qualified tax professional about the rules that apply to your residence and account structure. Do not assume that a 60-cent contract, a settlement payout or a secondary-market sale receives the same treatment as a stock, option or gambling win.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which platform has better election odds?
There is no permanent winner. A price is useful only when the contracts are genuinely comparable and the market has enough liquidity. To compare an election number:
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- Match the resolution date and authoritative source.
- Check whether one market includes a runoff, coalition, contingent election or other condition the other omits.
- Compare executable bid and ask prices, not just a midpoint or chart.
- Account for commissions, spread, withdrawal and network costs.
- Check recent volume and order-book depth before assuming you can exit.
- Record the timestamp, because prices can diverge within seconds after news.
A difference between prices may indicate information, liquidity, fee or contract-definition differences rather than a disagreement about the same probability. Treat the result as a market-implied estimate, not a poll and not a guarantee.
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Are prediction markets gambling or financial markets?
The answer depends on the legal regime and the product’s structure. A CFTC-designated contract market is regulated as a derivatives venue under federal commodities law. A blockchain-based international service may operate under a different legal framework and may be unavailable in particular jurisdictions. The fact that a contract has a binary payout does not, by itself, determine its legal classification.
From a risk perspective, both formats can produce rapid, total losses on a position. Election uncertainty, leverage if offered, thin liquidity, smart-contract failure and settlement disputes are financial risks even when the question feels like a bet. Use risk capital, understand the maximum loss, and do not borrow money to trade an event outcome.
Is Polymarket safe? Is Kalshi legal?
Assessing safety
“Safe” is not one feature. Evaluate legal eligibility, custody, operational security, market liquidity, settlement governance, fees, privacy and the protections available if something goes wrong. Regulated clearing and identity verification address some risks; self-custody and public ledgers address different ones. Neither model removes market loss or guarantees uninterrupted access.
Assessing legality
Kalshi’s CFTC designation provides a federal regulatory framework, while the CFTC states that federally regulated prediction markets can operate in all 50 states subject to applicable rules and customer qualification. That does not answer every state-law question or guarantee that every contract is available to every person. Polymarket International is explicitly unavailable to U.S. users; Polymarket US is described separately as a CFTC-designated market. Verify your own jurisdiction and the exact service before opening or funding an account.
A practical pre-trade checklist
- Confirm the entity: identify Kalshi, Polymarket International or Polymarket US in the account and legal disclosures.
- Confirm eligibility: check country, state, age, identity and any restricted-person requirements.
- Read the rulebook: locate the resolution source, deadline, payout, trading hours, pauses and dispute procedure.
- Calculate exposure: write down the maximum loss, total fees and the amount you can afford to lose.
- Check execution: inspect spread, depth, recent volume and the order type you will use.
- Secure custody: for a wallet-based service, protect keys, verify network and address details, and test a small transfer first.
- Plan the exit: decide whether you will close before settlement and what price or liquidity conditions would make that practical.
- Keep records: save confirmations, rulebook versions, transaction hashes, statements and settlement notices.
What the historical numbers tell you
| Date or figure | What it represents | Qualification |
|---|---|---|
| 1988 | The Iowa Presidential Stock Market, identified by the CFTC as the first modern U.S. prediction market. | A historical milestone, not a statement about current legality or performance. |
| 2004 | CFTC approval of Hedge Street as the first designated contract market offering binary options. | Shows when the agency began approving this type of regulated venue. |
| 2018 | Kalshi’s founding year. | Reported in a 2026 Bipartisan Policy Center account. |
| 2020 | Polymarket’s founding or operational start. | Reported by the Bipartisan Policy Center and the D.C. Circuit record. |
| $1.4 million | Fine imposed on Polymarket in a CFTC enforcement action. | Reported in the Bipartisan Policy Center’s 2026 summary and accompanied by a U.S.-user blocking requirement. |
| $24 billion per month | Estimated global trading volume for U.S. prediction markets in April 2026. | A Bipartisan Policy Center figure citing Pew Research; it is an estimate for that month, not a platform-specific total. |
These figures provide context for the sector’s development and scale. They do not predict the outcome of an election contract or the future of either platform.
Bottom line for a reader choosing between them
Choose based on the service you are legally allowed to use and the risk model you understand. Kalshi and Polymarket US offer the described CFTC-regulated exchange framework; Polymarket International offers a separate, non-custodial blockchain model unavailable to U.S. users. After eligibility, compare the contract’s resolution language, custody, clearing, order-book liquidity, all-in fees, withdrawal process, privacy and tax records. The better election market is the one whose rules and risks you can verify—not necessarily the one displaying the higher or lower headline probability.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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