Polymarket vs Kalshi: Product, Fees, Funding and Fit Compared

The comparison has three products, not two

Polymarket.com International

The international product is crypto-based and uses blockchain infrastructure. Its website is intended for users outside the United States except where other restrictions apply.

Polymarket US

Polymarket US is a separate fiat-based, US-regulated exchange built for US residents. It has a separate app and account system.

Kalshi

Kalshi is a US-regulated event-contract exchange. Its current help center says eligible users can access it from many countries, subject to identity verification, restrictions, and the Member Agreement.

Failing to separate the two Polymarket products is the main reason many online comparisons are already outdated.

Side-by-side comparison

Factor	Polymarket.com International	Polymarket US	Kalshi
Product model	Crypto-based international prediction market	Separate fiat-based US-regulated event-contract exchange	US-regulated event-contract exchange
Intended access	Non-US users outside restricted locations	Eligible US residents	Eligible users in the US and many supported countries
Account	Google, email, or supported wallet methods	Separate US app account	Identity-verified exchange account
Funding	Supported crypto assets and networks routed into the platform's collateral system	Product-specific fiat funding	Region-dependent bank, card, wire, payment-app, or crypto methods
Price model	Participant-driven YES/NO shares	Participant-driven event contracts	Participant-driven event contracts
Early exit	Sell to another participant if the order fills	Close a position under the US product's order system	Sell before settlement if a counterparty is available
Fees	Category- and behavior-dependent current schedule	Separate Polymarket US fee schedule	Current schedule can vary by trade or market; some funding routes also charge
Rules	Read each market's wording, source, and International resolution process	Read the US contract terms and determination rules	Read each contract's rules and named source

This table describes product structure, not a promise that a particular market is listed or liquid.

Access and account differences

For US residents

Polymarket's official help center directs US residents to the Polymarket US app and states that Polymarket.com International is not accessible for US trading. A Polymarket.com tutorial about wallets or Polygon is therefore the wrong setup guide for a US account.

The relevant decision is Polymarket US versus Kalshi. Compare:

which product currently lists the event;
identity and account requirements;
available funding and withdrawal methods;
actual fee shown for the trade;
bid-ask spread and depth; and
contract rules and source.

For users outside the US

Do not assume Kalshi is US-only. Its current help center says the exchange supports eligible users in many countries, while also maintaining restricted jurisdictions. International payment options differ from US options.

Check eligibility on both products first. If both are available, funding preference and the exact market become more important than company nationality.

Funding and withdrawal

Polymarket.com uses crypto-based routes. Supported assets can be bridged and converted into the collateral used on Polygon. That can be efficient for an experienced crypto user, but it introduces network, address, minimum, swap, and recovery considerations.

Kalshi uses an exchange account with payment methods that vary by region. Current help describes options such as bank or payment-app methods for eligible US users, while international users may have debit card, wire, or crypto options depending on location.

Neither model is universally easier:

crypto users may prefer Polymarket.com's interoperable on-chain rails;
users accustomed to verified financial accounts may prefer Kalshi;
a person without a supported withdrawal method should not deposit merely because registration succeeded.

Fees: compare the actual trade, not an old slogan

Polymarket.com currently documents taker fees across specified categories, maker rebates, and taker rebate programs. Some categories can have different rates or no platform trading fee.

Kalshi documents transaction fees based on the contract economics and says some markets may use different fee treatment. Its help center also lists processing fees for some deposit methods while other methods may have no platform processing fee.

A fair cost comparison includes:

current trading fee;
maker or taker status;
bid-ask spread;
price impact for the intended size;
deposit and withdrawal costs; and
any currency or crypto conversion cost.

If one platform is 0.41 bid and 0.47 ask while another is 0.44 bid and 0.45 ask, the spread may matter more than a small difference in the posted fee formula.

Market rules and settlement

Do not compare contracts by title alone. Two markets that appear to ask the same question can differ in:

deadline;
time zone;
source agency;
definition of the event;
treatment of postponements, recounts, or revisions;
early-close behavior; and
unusual settlement outcomes.

Read both rule sets and ask whether the contracts would resolve identically under a difficult edge case. If the answer is unclear, the displayed odds are not directly comparable.

Order books and early exit

Both products use prices created by participant orders rather than fixed sportsbook odds. On either platform:

the displayed probability may differ from the immediate buy or sell price;
a large order can consume multiple price levels;
a resting limit may never fill;
a portfolio value may not equal immediate cash-out value; and
an early exit requires another participant.

Execution quality should be compared on the exact market at the exact time, not inferred from a platform-wide reputation.

Which should you choose?

Polymarket.com may fit better if:

it is available in your location;
you already understand crypto transfers and wallet security;
a crypto-based workflow and on-chain market design matter to you;
the exact market and rules suit your research; and
the live order book offers acceptable execution.

Polymarket US may fit better if:

you are an eligible US resident;
you specifically want the separate Polymarket product;
its current market catalogue contains the event you want; and
its USD funding, fee, and withdrawal terms suit you.

Kalshi may fit better if:

you prefer an identity-verified, US-regulated exchange account;
it supports your country and funding method;
its contract wording and source are clearer for the event;
it offers the market and depth you need; and
its total cost is acceptable after fees and spread.

For more candidates beyond this comparison, use the Polymarket alternatives guide.

Three example decisions

Example 1: Experienced international crypto user

The user is eligible for both products, already holds supported crypto, and wants public on-chain market data. Polymarket.com may require less change to their existing workflow. They should still compare the exact contract and order book.

Example 2: US user who wants a USD account

The user should compare Polymarket US with Kalshi. Polymarket.com International is not the relevant product. The decision turns on market availability, rules, funding, fee, and depth.

Example 3: International user with no crypto experience

If Kalshi supports the user's country and an appropriate payment method, its account model may be easier. If it does not, that does not make bypassing Polymarket restrictions an acceptable alternative.

Limitations

This comparison does not rank live liquidity, market count, or performance because those change and require a defined dataset. It does not provide legal or tax advice. Product access, funding methods, fees, rewards, and catalogues can change after the review date. Verify every material decision in the official interface.

Focused answers

Frequently asked questions

Is Polymarket or Kalshi better?

Neither is universally better. Polymarket.com emphasizes a crypto-based international product; Polymarket US and Kalshi are separate regulated exchanges. The best fit depends on eligibility, funding, the exact contract, total cost, and rules.

Can US residents use Polymarket instead of Kalshi?

They can evaluate Polymarket US, subject to current eligibility. They should not use Polymarket.com International as if it were the US product.

Is Kalshi available outside the US?

Kalshi's current help guidance says eligible users can trade from many countries, with identity checks, restricted locations, and region-dependent payment methods.

Which platform has lower fees?

The answer can vary by product, market, price, order behavior, and funding route. Check both current schedules and include spread and price impact.

Do Polymarket and Kalshi show the same odds?

Not necessarily. Different participants, liquidity, timing, fees, and contract wording can create different prices. Confirm that the rules describe genuinely equivalent outcomes before comparing.

Can I sell early on both?

Both products support closing positions before final settlement, subject to the order book. A willing counterparty and sufficient liquidity are required.

Bottom line

Compare three distinct products

The useful comparison is not “crypto platform versus US platform.” It is Polymarket.com International, Polymarket US, and Kalshi as three distinct products. Start with eligibility, then compare the exact market's rules, executable price, total cost, and funding path.

Primary references

Sources checked for this guide

Sources were reviewed on August 2, 2026. Product rules, rates, availability, and interfaces can change; the linked first-party page controls when it differs from this summary.