A trader in New York and a trader in London face fundamentally different legal environments when they want to bet on whether inflation will exceed 4% next quarter or whether a technology company will announce a merger. Kalshi operates as a regulated prediction market platform in the United States under direct oversight from the Commodity Futures Trading Commission (CFTC), which has granted it specific permission to list Event Contracts tied to real-world outcomes. PredictIt, another U.S.-based platform, operates under a no-action letter that permits limited activity but carries different structural constraints. Polymarket, while accessible to U.S. users through various mechanisms, operates in a more ambiguous regulatory space and uses blockchain settlement. Understanding these differences is not merely technical—it determines whether a trader can legally access a platform, what contract types are available, how positions settle, and what recourse exists if something goes wrong.

The gap between these regulatory models has grown more pronounced as prediction markets have matured and attracted larger trading volumes. A regulated exchange like Kalshi must meet continuous compliance obligations, maintain transparent documentation, verify customer identity, and report activity to regulators. Competitors operating under lighter-touch arrangements may offer different contract ranges, lower fees, or faster onboarding, but they also operate with less formal customer protection. For a trader choosing where to allocate capital and attention, the regulatory structure is not a cosmetic detail. It affects market liquidity, price reliability, settlement certainty, and legal exposure.

Kalshi’s regulated framework under CFTC oversight

Kalshi received CFTC approval to operate as a designated contract market (DCM) in October 2022, making it the first exchange formally licensed to offer Event Contracts in the United States. This is not a gray-area arrangement or a no-action letter. The CFTC conducted a full application review, examined Kalshi’s market surveillance systems, custody procedures, participant protections, and conflict-of-interest controls. The approval came with explicit conditions: contracts must have objective, verifiable settlement criteria; Kalshi must maintain sufficient capital reserves; all participants must pass anti-money-laundering and know-your-customer verification; and the platform must report suspicious activity and trading data to regulators.

The consequence of formal licensing is that a regulated prediction market like Kalshi operates under continuous examination. The CFTC can audit records, require changes to contract specifications, demand explanation of pricing anomalies, and suspend or revoke the license if material compliance failures occur. From a trader’s perspective, this means contract settlement is unlikely to be arbitrary or subject to sudden reinterpretation. Kalshi publishes detailed resolution rules in advance, specifying exactly which data source will determine the outcome—whether a Federal Reserve announcement, a published inflation figure, congressional vote records, or third-party verified event attestations.

Kalshi’s regulated structure also means that customer funds are segregated from the company’s operational capital. If Kalshi faces bankruptcy or operational failure, user trading balances are protected separately rather than mingled with general creditors. This protective mechanism exists because the CFTC requires it. U.S. derivatives exchanges must maintain minimum capital requirements and hold customer funds in separate accounts at approved banks or clearinghouses. This is expensive and administratively demanding, which is why not every prediction market platform chooses to pursue full licensing.

The regulated exchange model also imposes geographical restrictions. Kalshi can verify that users are in the United States through address confirmation and device location checks, and it enforces those restrictions at the platform level. Non-U.S. residents cannot legally create accounts or place trades on Kalshi. This limitation is not a business decision—it is a licensing condition. The CFTC’s approval applies specifically to domestic operations, and extending service to international participants would violate the terms of the market designation.

PredictIt’s no-action letter approach and its constraints

PredictIt operates under a mechanism that is often misunderstood as equivalent to full licensing but is actually quite different: a no-action letter from the CFTC. A no-action letter is an enforcement discretion statement, not a formal license. The CFTC said, in effect, “We are not going to prosecute you for operating this prediction market under specific conditions,” but PredictIt is not a designated contract market and does not have the same regulatory standing as Kalshi.

The no-action letter granted to PredictIt includes significant operational restrictions. The platform can list only contracts with clear, politically or economically significant events—typically relating to U.S. elections, major government actions, or recognized international events. Contract sizes are capped at a maximum payout of $850 per contract (as of recent operating guidance), which is far smaller than Kalshi’s permitted contract values. Additionally, PredictIt must limit the number of contracts a single user can hold in any market to prevent one trader from dominating price discovery.

Because PredictIt operates under a no-action letter rather than formal market designation, it faces less rigorous regulatory apparatus but also less formal protection. The platform still conducts identity verification and comply with anti-money-laundering rules, but it is not required to maintain the same capital reserves or customer segregation standards as a regulated exchange. In practical terms, if PredictIt faced severe operational or financial stress, a trader’s account balance would not have the same statutory protection that CFTC-licensed exchanges provide.

The no-action letter mechanism also carries long-term uncertainty. The CFTC could theoretically withdraw the letter if it changed enforcement priorities or if PredictIt violated the stated conditions. This has not happened, and PredictIt has operated successfully for over a decade, but the arrangement is at the CFTC’s discretion rather than established through formal licensing. Traders should understand that no-action letters are an interim regulatory tool, not permanent authorization.

Polymarket and the decentralized, offshore model

Polymarket presents a different regulatory profile altogether. The platform operates using blockchain-based smart contracts and Automated Market Makers (AMMs) rather than traditional order books and centralized clearing. It is based in the Cayman Islands and does not hold itself out as a U.S. regulated exchange. Users access Polymarket through their own crypto wallets, and settlement occurs on the Polygon blockchain rather than through a centralized clearing system.

From a trader’s perspective, Polymarket offers several operational differences. Contract sizes can be larger than PredictIt’s caps because there is no equivalent regulatory ceiling. The contract variety is also broader—Polymarket lists speculative contracts on entertainment events, cryptocurrency price movements, and esoteric outcomes that would not pass a U.S. regulator’s materiality threshold. Users are not required to provide the same level of identity verification, though Polymarket has implemented Know Your Customer (KYC) procedures selectively and now enforces them more consistently, particularly for U.S. participants.

The critical legal issue is that Polymarket’s accessibility to U.S. traders exists in a regulatory gray zone. Polymarket itself is not a U.S. regulated exchange and makes no claim to be. However, U.S. users can access it—whether legally is contested. The CFTC has not formally blessed Polymarket, and some legal analysis suggests that U.S. residents participating in certain contract types could face enforcement exposure. This creates a risk-versus-reward calculation: Polymarket may offer contracts and liquidity that Kalshi does not, but U.S. participants bear compliance risk that Kalshi users do not.

Settlement on Polymarket is also fundamentally different. Rather than Polymarket itself determining resolution and paying winners, smart contracts execute automatically based on information feeds called “oracles.” If an oracle reports that an event has occurred, the contract resolves and tokens are redistributed to winning positions. This system is trustless in the cryptographic sense—it does not require trusting Polymarket as an institution—but it creates a different class of risk. If the oracle data is incorrect or manipulated, or if the smart contract code has a vulnerability, settlement could be incorrect, and remedies would be limited.

Key differences in contract types and market scope

A Kalshi user can trade on Inflation Surprise Indexes, 30-Year Mortgage Rate thresholds, Federal Reserve rate decisions, congressional legislative outcomes, and environmental metrics like carbon dioxide concentrations. These contracts are built on objective economic and political data that regulators can verify. Kalshi’s regulatory approval specifically covers contracts with verifiable external reference points—data published by government agencies, exchanges, or recognized private data providers.

PredictIt’s contract list skews heavily toward elections, political appointments, and major legislative events. The platform lists contracts on U.S. presidential elections, state governor races, Supreme Court decisions, Brexit-related outcomes, and similar major political events. The underlying reason is that the no-action letter’s conditions restrict PredictIt to events with clear national or international significance and objective resolution criteria.

Polymarket’s menu includes those categories but extends far beyond them. Users can trade on cryptocurrency price movements, corporate earnings surprises, celebrity news outcomes, sports events, and science/technology milestones that have no regulatory necessity for objective verification. This flexibility is one reason traders are attracted to Polymarket—it permits speculation on a much broader range of future possibilities. However, it also means that contract specifications may be less formally vetted, and settlement disputes are more likely.

The regulatory difference translates directly into trading scope. A regulated prediction market platform like Kalshi must justify each contract offering to regulators and document why the settlement methodology is objective and verifiable. That process takes time and administrative effort. Polymarket, by contrast, can list new contracts with minimal oversight—if the code deploys and the oracle mechanism is configured, the contract is live. This creates a real operational trade-off: regulatory rigor produces certainty and legal protection, while lighter oversight enables broader market innovation.

Settlement procedures and dispute resolution

When a contract expires on Kalshi, settlement follows a documented procedure. Kalshi staff or contracted resolution specialists examine the predetermined data source—a Federal Reserve report, a published economic statistic, or a congressional vote record—and determine whether the event occurred. If traders dispute the resolution, they can lodge a formal objection, and Kalshi’s compliance and operations teams review the evidence against the contract’s specification. The entire process is logged and auditable by the CFTC.

PredictIt uses a similar but slightly less formal process. The platform publishes resolution criteria in advance, and when an event occurs or a deadline passes, PredictIt resolves contracts and distributes winnings. Disputes are possible, and PredictIt’s team investigates them, but the mechanism is not backed by formal regulatory oversight to the degree that Kalshi’s is. If a trader believes PredictIt misresolved a contract, the dispute process is internal rather than subject to regulatory appeal.

Polymarket’s settlement is cryptographic rather than institutional. A smart contract holds the funds and waits for the oracle to report an outcome. Once the oracle signals that an event has occurred, the contract executes automatically and distributes tokens to winners. This eliminates operational delays and removes the possibility of institutional favoritism, but it creates a different kind of risk. If the oracle reports incorrectly, or if traders disagree about how to interpret ambiguous contract language, the blockchain record cannot be undone retroactively. Remedies would require code changes (controversial in decentralized systems) or coordination among token holders to agree that a reroll was necessary.

For a trader managing large positions, the settlement certainty and dispute mechanisms matter significantly. A regulated prediction market platform like Kalshi offers institutional backing and regulatory appeal processes. Polymarket offers cryptographic determinism but limited recourse if that determinism produces an unfair result. PredictIt sits between them: institutional but not formally regulated.

Geographic access and international participation

Kalshi is available only to users in the United States. The platform enforces this through IP geolocation, address verification, and account-creation requirements that confirm U.S. residency. Non-U.S. users will be denied account creation or will have accounts suspended if they circumvent these checks. This is not a business preference—it is a licensing requirement. The CFTC’s market designation applies only to domestic operations, and Kalshi cannot legally expand outside that scope without seeking separate regulatory approval in other jurisdictions.

PredictIt does not explicitly restrict non-U.S. access to the same degree, though the platform has implemented increasingly strict identity verification. International users have historically been able to create accounts on PredictIt, though terms of service vary by region. This creates an ambiguous legal status: PredictIt as a U.S. entity may be exposing itself to regulatory risk by permitting international participation, while non-U.S. traders may be accessing a platform intended for U.S. residents.

Polymarket, being offshore and decentralized, does not restrict access by geography in the traditional sense. Any user with a crypto wallet and internet connection can trade on Polymarket regardless of location. However, the CFTC and other U.S. regulatory bodies have increasingly scrutinized whether U.S. persons using Polymarket are in compliance with derivatives trading restrictions. This creates regulatory uncertainty rather than legal permission—users from many countries can access Polymarket, but U.S. residents may face enforcement risk.

For a global trader, this fragmentation means choosing between regulated access (Kalshi in the U.S. only), broader access with ambiguity (PredictIt internationally but with evolving restrictions), or decentralized access with regulatory risk (Polymarket globally but uncertain U.S. legal status). A prediction market platform choosing the regulated path necessarily forfeits international reach to maintain licensing compliance.

Liquidity, pricing, and market depth

Kalshi’s regulated status and U.S.-only access means its liquidity is concentrated in the domestic U.S. user base and institutional participants approved to trade on the platform. Major economic contracts—inflation, employment, Federal Reserve decisions—attract substantial volume because they are material to traders, investors, and risk managers. However, Kalshi cannot access global liquidity pools that Polymarket reaches through decentralized markets and international participants.

PredictIt’s liquidity is typically lower than Kalshi’s for major contracts but can be substantial for high-profile political events. The platform has benefited from media attention and academic interest in prediction markets, which has driven sustained participation in election contracts. However, PredictIt’s contract size caps constrain the amount of capital that can flow into individual contracts, which can create illiquidity if large traders want to establish significant positions.

Polymarket typically offers higher liquidity for speculative contracts, particularly cryptocurrency-related events where the user base includes crypto traders with substantial capital. The AMM mechanism provides continuous pricing without requiring a matching counterparty, which ensures that users can always trade at some price. However, this comes with slippage—the price received may differ from the mid-market level if the order size is large relative to the AMM’s liquidity pools.

For a trader seeking tight spreads and deep order books, Kalshi’s regulated approach and institutional access generally provide better execution on major events. For a trader seeking contract variety and speculative exposure, Polymarket’s decentralized model offers more contracts and liquidity, though with execution-quality trade-offs. The regulatory difference directly influences market structure and trading costs.

Compliance obligations and user reporting

Kalshi collects substantial user data and reports it to regulators. Know Your Customer information is mandatory and verified through third parties. Transactions above certain thresholds trigger Suspicious Activity Reports. Kalshi maintains records of all orders, cancellations, and fills, which are available to the CFTC upon request. Users should understand that trading on Kalshi is not private—it is recorded and may be subpoenaed in legal proceedings or regulatory investigations.

PredictIt similarly maintains customer records and reports suspicious activity to the Financial Crimes Enforcement Network (FinCEN). The compliance burden is less intensive than Kalshi’s because PredictIt is not a full-fledged regulated exchange, but the platform still operates under anti-money-laundering rules and provides user data to law enforcement when required.

Polymarket’s approach has evolved. Earlier, the platform had minimal KYC requirements, but it has increasingly implemented compliance procedures, particularly for U.S. users. The shift reflects both regulatory pressure and practical necessity—lending legitimacy requires demonstrating anti-money-laundering controls. However, Polymarket’s use of blockchain means that transaction records are permanent and transparent, creating a different kind of record from centralized platforms. A trader’s wallet address, transaction history, and position sizes are theoretically accessible to anyone analyzing the blockchain.

For a trader concerned about regulatory scrutiny or privacy, these differences are material. A regulated prediction market platform like Kalshi produces detailed compliance records that regulators can examine, but those records also establish a clear audit trail if the trader can demonstrate legitimate use. Polymarket’s blockchain transparency is permanent but pseudonymous—a wallet address is visible, but it need not be connected to an individual identity unless the trader chooses to verify it.

Choosing a platform: regulatory trade-offs and risk assessment

The choice between Kalshi, PredictIt, and Polymarket is not simply a matter of feature preferences. It is fundamentally a choice about regulatory protection versus access and flexibility. A trader in the United States who wants maximum legal certainty and regulatory protection should use Kalshi, accepting that contract offerings are narrower and limited to economically or politically significant events. That trader knows that Kalshi is licensed, that customer funds are protected, and that settlement disputes will be resolved through established procedures.

A trader who wants broader political and economic contract exposure might choose PredictIt, accepting that the no-action letter provides less formal protection than full licensing and that the platform operates under more constrained regulatory conditions. This is a reasonable choice for traders who value the contract variety and political event focus that PredictIt offers.

A trader who wants global participation, speculative variety, and decentralized settlement might use Polymarket, but should do so with clear awareness of the regulatory uncertainty, the permanent blockchain record, and the absence of centralized dispute resolution. U.S. traders choosing Polymarket should understand that they may face enforcement exposure if regulators determine that participation violates derivatives trading restrictions.

For international traders, geography constrains the options. Only Polymarket offers truly global access, though with regulatory ambiguity. PredictIt permits some international participation but with increasing restrictions. Kalshi is not available outside the United States, period. A regulated prediction market operates under domestic legal constraints that decentralized platforms can partly circumvent.

The fundamental tension is that regulatory oversight protects traders through institutional backing, customer segregation, and formal dispute resolution, but it requires narrower contract scope, geographic limitations, and higher operational costs. Lighter-touch or decentralized models offer broader access and contract variety, but they sacrifice some protections and create compliance risk. Neither model is objectively superior—the right choice depends on the trader’s priorities, risk tolerance, geographic location, and the specific contracts they want to access.