Picture two traders sitting side by side. One is scrolling Polymarket on a phone, watching a presidential contract move in cent-fractions on volume in the tens of millions. The other is logged into PredictIt on a laptop, capped at $3,500 of exposure per contract, trading a market that has probably existed in something like its current form since 2014. Same asking-a-question-about-the-future instinct. Very different rooms.
That gap is the whole story of this comparison. Polymarket is the crypto-native, deep-liquidity venue that most people mean when they say "prediction market" today. PredictIt is the academic-research project run by the Prediction Market Research Consortium, a US not-for-profit that took over operations from Victoria University of Wellington in July 2025, tolerated by the CFTC under a no-action letter, and operated at a scale that would embarrass a mid-sized regional bookmaker. If you are choosing between them, you are really choosing between two different theories of what a prediction market should be.
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The short answer, if you want to stop reading here
Most active traders will land on Polymarket. It has more markets, deeper order books, no per-contract exposure cap, and settlement in USDC rather than a US bank account that PredictIt takes weeks to release funds from. It is also the platform that broke through into mainstream financial-press coverage during the 2024 US election cycle, which is not a trivial signal about where liquidity now lives.
But PredictIt has one thing Polymarket does not, and it is not nothing. It is a legally distinct animal in the United States, operating under an academic research exemption rather than under CFTC-regulated event contracts or offshore crypto rails. For a US resident who wants to trade political markets on a US-facing platform, with dollars, and without touching a crypto wallet, PredictIt has been the default for over a decade. The trade-off is you pay for that access in fees, caps, and a much thinner set of markets.
So the honest answer is: Polymarket if you want a real trading venue, PredictIt if you want the specific product PredictIt has always been.
Where each one came from
PredictIt launched in 2014 as an academic project. Victoria University of Wellington ran it with US partners under a no-action letter from the CFTC, which is essentially the regulator saying "we are not going to enforce against you provided you stay small and academic." In July 2025 the CFTC amended that letter and operations passed to the Prediction Market Research Consortium, a US not-for-profit run by academics. The letter is still the whole reason PredictIt exists in its current form, and it still sets the terms: exposure in any one contract is capped at the federal limit on individual campaign contributions, currently $3,500 and adjusted for inflation every two years, and the market is restricted to political events. The 2025 amendment removed the old 5,000-trader-per-contract limit and raised the per-contract cap to that federal figure. Those are not product decisions. They are the terms of the permission slip.
Polymarket, by contrast, launched in 2020 on Polygon, a blockchain built for cheap USDC transactions. It is a decentralised order-book venue where trades settle onchain and resolution runs through the UMA optimistic oracle. It grew during 2022, exploded during 2024, and now anchors the reference price for most political and macro questions the financial press wants to cite. Volume in the 2024 US presidential cycle ran into the billions of dollars, comfortably an order of magnitude past anything PredictIt has ever done.
The two platforms did not evolve to compete with each other. They evolved to be different things.
Fees, and where the money actually goes
Fees are where PredictIt looks worst on paper. The platform charges 10% on profits from winning trades, plus a 5% withdrawal fee when you cash out. Combine those and you can end up giving back a serious chunk of a good year. A trader who nets $10,000 in profits and withdraws the balance is looking at $1,000 to the profit fee and then another cut on the way out. It is a real drag, and it exists because the academic-exemption structure needs to cover its own costs without commercial backers.
Polymarket used to be the easy answer here, and it is no longer. For most of its history it charged nothing to trade, but that changed over the first quarter of 2026, when it rolled out a taker fee across its categories. Political contracts, the ones that matter for this comparison, now carry a base taker rate of 0.04. Makers are never charged, so posting an order that somebody else trades against still costs nothing. Geopolitical and world-event markets remain fee-free, and there is no Polymarket fee to deposit or withdraw.
The two fee models are different shapes rather than different sizes, and the shape is what matters. PredictIt takes a share of what you make: 10% of your profits, then 5% of the balance on the way out, both applied to outcomes. Polymarket takes a small slice of each trade where you cross the spread, and nothing at all on the winnings themselves. So a profitable PredictIt trader pays more the better they do, while a Polymarket taker pays in proportion to how often they trade. For someone who wins consistently, PredictIt is still the heavier of the two by a distance. The old line that Polymarket is simply free is no longer true, and anyone still repeating it is working from a 2025 fee schedule.
There is also a less visible cost on the Polymarket side for anyone using the main venue: the ramp in and out of stablecoin. You may be paying exchange fees, network fees, or spread on conversion, none of which appear on a fee schedule. US residents on the regulated Polymarket venue are a different case, since that route funds in dollars through registered intermediaries rather than on crypto rails. Our guide to funding a Polymarket account with USDC walks through the mechanics. PredictIt takes plain US dollars from a plain US bank account. Simpler, in that specific narrow sense.
Liquidity, depth, and what you can actually trade
Here is where the comparison gets uncomfortable for PredictIt, though less so than it once did. The July 2025 amendment removed the 5,000-trader-per-contract limit and raised the exposure cap to $3,500, and the CFTC said plainly that it expected this to support "a liquid market" while keeping the venue small-scale. Depth should therefore be structurally better than under the old regime. But the ceiling is still a ceiling: exposure is capped per participant where Polymarket's is not, so a PredictIt book thins out at a size a Polymarket book absorbs. Try to move real size and you still move the market more than you would on Polymarket.
Polymarket, in its most-liquid political and macro markets, has order books that can absorb tens of thousands of dollars without meaningfully repricing. That is a genuine trading environment. It is also why professional traders and hedge funds have shown up. If you want to understand how those prices form, our explainer on how prediction market odds work covers the mechanics.
Market breadth is the other divide. PredictIt is almost entirely US political markets, with a small selection of international elections and the occasional economic contract. Polymarket has US politics, yes, but also sports, entertainment, crypto price ladders, geopolitics, science, and any number of oddball cultural questions. If you want to trade the 2026 box office race or a Nobel Prize contract, PredictIt is not the venue.
Regulation, and the very different legal footings
Both platforms operate in a US legal environment that is fussy about prediction markets, and they solve for it in opposite ways.
PredictIt lives under the CFTC no-action letter. That means it is not technically a regulated exchange, but it is also not offshore. It is a specifically permitted academic-research operation, and its constraints (the caps, the market limits, the profit fees) are the price of that permission. That permission has been contested and litigated over the years, and the platform's future has looked uncertain more than once, but as of writing it continues to operate.
Polymarket's US position is more complicated. The platform settled with the CFTC in 2022 over unregistered event-contract trading and, for a period, restricted US users. It has since taken a different route back into the US market through the QCEX acquisition, and our guide to Polymarket's regulated US access explains what that actually means for a US resident today. The short version: it is a legitimate on-ramp, but it is a newer and more constrained product than what non-US users see.
If you want the broader legal landscape, our overview of whether prediction markets are legal in the US frames both platforms alongside Kalshi and the CFTC-regulated event-contract world.
Withdrawals, custody, and the boring stuff that matters
A thing nobody discusses until it bites them: PredictIt withdrawals go through ACH and can take weeks. The platform holds funds through a US banking partner, which means you are exposed to that banking relationship and to the general pace of the US ACH system. It is not fast money.
Polymarket settles in USDC on Polygon, which means withdrawals to a wallet are effectively instant, and from there you handle the ramp back to fiat yourself. That is faster, more flexible, and also more dangerous. You are responsible for your own custody. A lost seed phrase on Polymarket is a lost balance. A forgotten PredictIt password gets reset by email.
This is a philosophy split, not a bug on either side. Some traders want the speed and self-custody of crypto rails; others want the paperwork of a US-regulated banking on-ramp. Our piece on why prediction markets run on crypto rails explains the design choice.
The editorial take
If you are an active trader who wants to size up, move fast, and access more than US politics, Polymarket is the platform. It is not close.
If you are a US resident with a specific interest in US political contracts, a preference for dollars over USDC, and a willingness to accept the caps and fees in exchange for a simpler legal and custodial footing, PredictIt still has a place. It is a smaller, quirkier, more constrained product, and that is fine. It is what it was built to be.
What neither platform is, quite yet, is the definitive answer for a US retail trader who wants the depth of Polymarket with the regulatory clarity of PredictIt. That gap is what Kalshi is trying to fill from a different direction, and our Polymarket vs Kalshi comparison picks that thread up.
iPredicta tracks contracts across Polymarket, Kalshi, PredictIt, and the regulated UK venues, so readers can see the same question priced across different platforms and choose the venue that fits how they want to trade. The point of this section is not to sell you on one platform; it is to give you enough of the mechanics to pick the right one for the trade you actually want to make.
Frequently asked questions
Is PredictIt legal in the United States?
PredictIt operates legally in the United States under a no-action letter from the CFTC, which permits it as an academic research project rather than a regulated exchange. The platform is run by the Prediction Market Research Consortium, a US not-for-profit that took over from Victoria University of Wellington in July 2025, and its constraints (a per-contract exposure cap set at the federal campaign-contribution limit, currently 3,500 dollars, a restriction to political events only, and profit fees) are the specific terms of that academic exemption. The 2025 amendment removed the previous 5,000-trader-per-market cap and raised the exposure limit from 850 dollars. The letter has been contested and its future has looked uncertain more than once, but PredictIt continues to operate. It is not a CFTC-regulated venue in the same sense that Kalshi is, and users should understand they are trading on a permitted research platform rather than a standard financial exchange.
Can US residents use Polymarket?
US residents can access Polymarket through its regulated US on-ramp built on the QCEX exchange acquisition, though the product is more constrained than what non-US users see. The main Polymarket venue, the deep-liquidity one that carried billions in 2024 election volume, is not directly available to US residents due to a 2022 CFTC settlement over unregistered event-contract trading. The regulated US route offers a narrower slate of markets, tighter compliance checks, and a different account structure. For US traders who want the full Polymarket experience with maximum market breadth, the practical reality is that access is meaningfully more limited than it is for international users.
Which platform has better liquidity, Polymarket or PredictIt?
Polymarket has dramatically better liquidity than PredictIt, often by more than an order of magnitude on comparable markets. Polymarket's top political and macro contracts can absorb tens of thousands of dollars without significantly moving the price, and total volume during the 2024 US presidential cycle ran into the billions. PredictIt is capped structurally at 3,500 dollars of exposure per user per contract, which puts a ceiling on order-book depth even after the 2025 amendment removed the old 5,000-trader-per-market limit. For active traders or anyone hoping to size up a position, this gap is decisive.
How do the fees compare between Polymarket and PredictIt?
PredictIt charges 10% on profits from winning trades plus a 5% withdrawal fee, and those exist because the academic-exemption structure has to fund itself without commercial revenue streams. Polymarket charged neither for most of its history, but that is out of date: it introduced taker fees over the first quarter of 2026, and political contracts now carry a base taker rate of 0.04. Makers are never charged, geopolitical markets remain fee-free, and there is no fee to deposit or withdraw. The two structures are different shapes. PredictIt takes a share of what you make, so it costs more the better you do; Polymarket takes a small slice of each trade where you cross the spread, and nothing on the winnings. For a trader who wins consistently PredictIt remains the heavier of the two, but the claim that Polymarket is fee-free is no longer correct.
What kinds of markets can you trade on each platform?
PredictIt is almost entirely US political markets, while Polymarket covers politics, sports, entertainment, crypto prices, geopolitics, science, and cultural questions across dozens of categories. PredictIt's market slate reflects its academic-research mandate, which was originally focused on political forecasting and has stayed close to that remit. Polymarket runs open-ended contracts on almost any resolvable future question, from box-office numbers to Nobel Prize winners to Bitcoin price ladders. If you specifically want US political contracts and nothing else, either platform works. If you want anything beyond that (sports, crypto, entertainment, world events), PredictIt is simply not the venue, and Polymarket is the practical default.