Kalshi vs Polymarket: Honest Comparison (2026)

This is the most quantitative Kalshi vs Polymarket comparison we could write. Not a press release. Not a listicle. We ran the fee math at 20¢, 50¢, and 80¢ contracts, broke down every regulatory nuance, and built persona cards that show real annual cost differences at different trading volumes. If you are deciding between Kalshi or Polymarket, or just want to understand how they actually compare, start here.

Last updated April 2026

Quick Verdict

Choose Kalshi if…

You want a fully established US-regulated account with USD deposits
You trade Combos (parlays) across NFL, NBA, or Mentions
You want standard 1099 tax forms without crypto complexity
You trade low volume where the fee premium (~$20/year) is immaterial
You want predictable, formula-based fees you can model exactly

Consider Polymarket if…

You trade politics or geopolitics markets where Polymarket fees are 0–1% vs Kalshi’s 3.5%
You are an international user comfortable with USDC
You need market categories not on Kalshi (crypto-native markets, viral headlines)
Volume is high enough that the fee difference (~$1,560/year at active volumes) is meaningful
You want maker rebates (20% for crypto, 25% for most categories) to reduce costs further

Both platforms are legitimate options for US users. The choice is almost always about fees vs. USD simplicity vs. market selection — not about one being generically better.

Side-by-Side Feature Comparison

Feature	Kalshi	Polymarket
Regulation	CFTC-designated DCM (KalshiEX) + DCO (Kalshi Klear). Established since 2020–2024.	Polymarket US (QCX LLC) is a CFTC DCM as of July 2025. International platform is separate — explicitly 'not regulated by the CFTC.'
US Access	Serves users in most US states. Sports contract availability varies due to ongoing state litigation; Nevada sports contracts are currently blocked by court order.	Polymarket US rolling out via waitlist. International platform is separate.
Deposit currency	USD — standard bank transfer, debit card, wire, PayPal, Venmo, Cash App.	USDC (stablecoin). US/MoonPay/Coinbase required; additional intermediary fees may apply.
Trading fees	Taker: 0.07 × p × (1−p) per contract. Peaks at $0.0175/contract at 50¢ (3.50% of position). Maker: 25% of taker rate.	Category-based taker (V2, March 2026): feeRate × p × (1−p). Politics/Finance/Tech 2.00% at peak; Crypto 1.80%; Geopolitics free. Maker rebates: 20% crypto, 25% most categories.
Deposit fees	ACH free. Debit card: 2% fee.	Polymarket charges no deposit fee; intermediary (Coinbase, MoonPay) may charge.
Combos / Parlays	Yes — Kalshi Combos across NFL, NBA, and Mention markets.	No first-party combo or parlay product.
Tax reporting	Standard US forms: 1099-B, 1099-INT, 1099-MISC, 1099-DA depending on activity.	More complex — USDC/crypto mechanics add tax layers not present on Kalshi.
Mobile app	iOS + Android.	iOS + Android.
Market focus	Economics, weather, politics, sports, companies, crypto, commodities (14 contracts). Regulated-first catalog.	Politics, crypto, culture, geopolitics, sports, headline markets. Broader internet-native catalog.
Minimum deposit	$1	No published minimum, but USDC on-chain mechanics create practical friction.

Fee Comparison: The Actual Math

Most Kalshi vs Polymarket comparisons say “Kalshi has formula-based fees” and stop there. Here is what the formulas actually produce at specific price points.

Kalshi taker fee formula

0.07 × C × p × (1 − p)

C = contracts, p = price (0–1). Fee is the same whether buying YES or NO. Peaks at p = 0.50; symmetric toward extremes.

Polymarket taker fee formula

feeRate × C × p × (1 − p)

V2 formula (March 30, 2026) — exponent removed. Rate varies by category: Politics 0.040, Crypto 0.072, Geopolitics 0 (free).

Worked Examples: 100 Contracts

All numbers below are total taker fees for a 100-contract order. The “% of position” column shows the fee as a fraction of what you actually pay to open the position.

Price	Position cost	Kalshi taker	% of position	Poly Politics	% of position	Poly Crypto	Poly Geopol
20¢	$20.00	$1.12	5.60%	$0.64	3.20%	$1.15	$0.00
50¢	$50.00	$1.75	3.50%	$1.00	2.00%	$1.80	$0.00
80¢	$80.00	$1.12	1.40%	$0.64	0.80%	$1.15	$0.00

What this means in practice

Kalshi is exactly 1.75× more expensive than Polymarket on politics markets at every price point. Both use the same p×(1−p) structure — the ratio is just the fee rate coefficients: 0.07 / 0.04 = 1.75.
Polymarket crypto (feeRate 0.072) is ~3% more expensive than Kalshi — it’s the only Polymarket category that costs more. At 50¢, crypto is $1.80 vs Kalshi’s $1.75 for 100 contracts.
Polymarket geopolitics is genuinely free. If you trade geopolitical events, this is a hard advantage.
Kalshi maker fees are 25% of taker fees. If you can fill via limit orders, Kalshi’s effective cost drops to ~0.44¢/contract at 50¢ — competitive with Polymarket politics.
Robinhood charges ~$0.02/contract flat (~$0.01 commission + ~$0.01 exchange fee). At 50¢ that’s $2.00 per 100 contracts — more expensive than Kalshi ($1.75) and Polymarket politics ($1.00).

To run these numbers for your own trade, use the Prediction Market Fees Calculator →

Market Coverage

Both platforms cover politics, sports, economics, and finance — but the overlap is more superficial than the category names suggest.

Kalshi’s catalog is structured around regulated event contracts. It has genuine depth in US economics (CPI, Fed rate decisions, GDP), weather (temperature thresholds, hurricanes), domestic politics, NFL, NBA, and company milestones. The products feel curated for a US-regulatory context: specific, well-defined, and resolvable. Kalshi Combos — multi-leg positions across related events — are uniquely available on Kalshi and function like a regulated parlay product. See how combo math works at the Parlay Calculator. As of April 2026, Kalshi also lists 14 commodity contracts — WTI crude, Brent crude, gold, silver, natural gas, coffee, copper, sugar, corn, soybeans, wheat, nickel, diesel, and lithium — covering energy, metals, and agricultural markets. Polymarket has no equivalent commodity offering, making this an area where Kalshi’s catalog has no direct competitor on the prediction-market side.

Polymarket’s catalog is broader in internet-native categories. Where Kalshi built from CFTC compliance outward, Polymarket built from social relevance inward. Its strengths are in crypto-native questions, viral political events, geopolitics (still fee-free), and culture — the kinds of markets that blow up on social media during major news cycles. This is why many traders first encountered “prediction market odds” through Polymarket during elections.

There is no universal winner on market coverage. The right question is: which platform has the specific market you want, at a price you can model? Use the Odds Converter to translate any contract price into implied probability or American odds for comparison.

Regulation & U.S. Access

This is where the comparison is most meaningful — and where most articles get it wrong by being either too dismissive of Polymarket or too credulous about its full US regulatory status.

Kalshi: The clearer regulatory picture

The CFTC designated KalshiEX LLC as a contract market in November 2020. Kalshi Klear LLC was registered as a derivatives clearing organization in August 2024. This two-layer structure — exchange and clearinghouse — is what “fully regulated US exchange” actually means in practice under the Commodity Exchange Act. User funds are held in CFTC-required segregated accounts. For a deeper explanation of what this structure means and how it works, see What Is Kalshi?

Polymarket: The more layered story

The honest Polymarket regulatory timeline: In January 2022, the CFTC settled with Blockratize Inc. (original Polymarket operator) over off-exchange binary options offered without CEA compliance. That settlement is settled history, but it matters for context on how the platform evolved.

Since then, the picture has changed substantially. QCX LLC d/b/a Polymarket US was designated as a CFTC contract market in July 2025. Polymarket’s current US page describes Polymarket US as operated by QCX LLC — while the international Polymarket platform is described as “not regulated by the CFTC.” Those are two separate products, and most existing comparisons conflate them.

The accurate 2026 statement: Polymarket US is a real regulated entity, but it is newer and rolling out from a waitlist. The international platform — the one most people think of as “Polymarket” with the broad market catalog and USDC deposits — is explicitly not CFTC-regulated. Neither extreme (“Polymarket is illegal” nor “Polymarket is fully regulated everywhere”) is accurate.

Explore Kalshi event markets

The established US-regulated platform with USD deposits, formula-based fees, and Combos.

Explore Kalshi event markets →

ChanceMetrics may earn a referral commission if you sign up through this link. This does not affect our editorial content, calculator methodology, or how we evaluate platforms. Trading involves risk of loss.

Who Should Use Which: Persona Cards

Abstract advice doesn’t tell you much. Here are three realistic trader profiles with actual fee math attached to each.

Persona A

US Newcomer

First prediction market account. Wants to trade US elections and sports. 1 trade/week, ~50 contracts at ~50¢.

Kalshi annual fees

~$45.50/year (0.07 × 50 × 0.50 × 0.50 × 52 = $45.50)

Polymarket politics annual

~$26/year for politics equivalent (0.04 × 50 × 0.50 × 0.50 × 52 = $26.00)

Annual fee gap

~$19.50/year difference (1.75× ratio)

→ Kalshi. The fee premium is small in absolute terms (~$20/year). USD deposits, established US access, and standard 1099s are worth it for a first account.

Persona B

Active Fee-Sensitive Trader

Runs quantitative edges. 20 trades/week, 200 contracts each, mixed prices near 45¢–55¢.

Kalshi annual fees

~$3,640/year (20 × 200 × 0.07 × 0.45 × 0.55 × 52 ≈ $70/week × 52)

Polymarket politics annual

~$2,080/year for politics equivalent (0.04/0.07 × $3,640 = $2,080; ~$40/week × 52)

Annual fee gap

~$1,560/year difference (1.75× ratio at every price point)

→ Platform choice matters at this volume. Polymarket politics is 1.75× cheaper — consistently, at every price. If your edge survives both fee structures, run the numbers. At $1,560/year the gap compounds fast.

Persona C

Seasonal Event Bettor

Trades 10–15 times per year around major events (election night, Fed meetings, playoff games). 200 contracts at ~60¢.

Kalshi annual fees

~$40/year (0.07 × 200 × 0.60 × 0.40 × 12 = $40.32)

Polymarket politics annual

~$23/year for politics equivalent (0.04 × 200 × 0.60 × 0.40 × 12 = $23.04)

Annual fee gap

~$17/year difference (1.75× ratio)

→ Fees aren't the deciding factor here. Choose based on which markets you care about most. Kalshi for Combos and USD simplicity; Polymarket for broader headline event coverage.

Fee math assumes taker fills. Maker fills on Kalshi are ~4× cheaper per contract — if you can consistently use limit orders, the Kalshi-Polymarket gap narrows. Use the EV Calculator to model net edge after fees for a specific trade.

What About Robinhood and PredictIt?

Robinhood offers event contracts through licensed exchange partners including KalshiEX LLC and ForecastEX. It charges approximately $0.02/contract flat (~$0.01 Robinhood commission + ~$0.01 exchange fee per side) — more expensive than Kalshi taker fees at most price points. Robinhood’s value is distribution — it brings prediction markets to an enormous existing brokerage customer base — but its catalog is currently limited compared to either Kalshi or Polymarket. Worth watching, not the primary choice for active traders yet.

PredictIt is a known brand but fee-uncompetitive: 10% of gross profits plus a 5% withdrawal fee. Against Kalshi’s formula-based fees and Polymarket’s 0–1.8% structure, PredictIt’s cost stack is difficult to justify for most traders. It maintains a position cap ($850 per question, $3,500 total) that further limits its appeal for larger positions.

Frequently Asked Questions

Common questions about Kalshi vs Polymarket — answered without hedging.

Is Polymarket legal in the US?

Polymarket now operates a separate U.S. entity — QCX LLC d/b/a Polymarket US — which was designated as a CFTC contract market in July 2025. However, the better-known international Polymarket platform remains separate and is explicitly described as 'not regulated by the CFTC.' Broad statements like 'Polymarket is illegal in the U.S.' are outdated, but it is equally inaccurate to treat the full Polymarket ecosystem as one unified regulated U.S. platform. Polymarket US is rolling out from a waitlist as of 2026.

Does Polymarket charge fees?

Yes, as of March 30, 2026 (V2 fee structure). Polymarket charges category-based taker fees across most markets using the formula: feeRate × p × (1−p). Peak effective rates at 50% probability: Crypto 1.80%, Culture 1.25%, Politics 2.00%, Finance 2.00%, Tech 2.00%, Economics 0.75%, Weather 0.625%, Sports 0.75%. Geopolitics markets remain fee-free. Maker rebates are 20% for crypto and 25% for most other categories.

Are Kalshi fees higher than Polymarket?

It depends on the category. Both Kalshi and Polymarket V2 use the same p×(1−p) fee structure — the ratio is just the leading coefficient. Kalshi's taker fee is 3.50% of position at 50¢. Polymarket politics is 2.00% — making Kalshi 1.75× more expensive for politics at every price point. Polymarket crypto (feeRate 0.072) is 3.60% of position at 50¢ — actually slightly more expensive than Kalshi. Polymarket geopolitics is free. The full calculus also includes deposit friction (USD vs USDC), regulatory certainty, and available market types.

What is the difference between Kalshi and Polymarket?

The clearest differences are structural. Kalshi is a fully established CFTC-regulated U.S. exchange with USD deposits, standard 1099 tax forms, and a published formula-based fee schedule. Polymarket is a broader prediction-market brand associated with politics, crypto, and viral internet markets; its U.S. access now runs through a separate regulated entity (QCX LLC) that is still rolling out. For US traders who want established USD rails, regulation, and Combos, Kalshi is the cleaner choice. For international traders or those chasing cheapest fees on politics or geopolitics, Polymarket often wins on fees.

Can you use both Kalshi and Polymarket?

Yes, they are not mutually exclusive. Some traders use Kalshi for US-regulated markets, combos, and USD liquidity, while using Polymarket for specific categories where fees are lower or market selection is broader. If you trade both, be aware of the regulatory and tax differences — Polymarket's crypto/USDC mechanics add complexity that Kalshi's USD structure avoids.

What are Kalshi's fees exactly?

Kalshi's standard taker fee formula is: 0.07 × contracts × price × (1 − price). At 50¢ that's $0.0175 per contract (3.50% of position). At 20¢ or 80¢ it drops to $0.0112 per contract. Maker fees (limit orders that add liquidity) are 25% of the taker rate — a meaningful cost reduction if you use limit orders. There is no settlement or profit fee — Kalshi removed it effective February 5, 2026. There are no deposit fees on ACH.

Does Kalshi or Polymarket have better liquidity?

For most retail-sized orders, it depends on the specific market. Both platforms can have deep books in flagship contracts (major elections, marquee sports events) and thin books in niche markets. Kalshi emphasizes its regulated exchange structure and institutional liquidity support. Polymarket's maker rebate system (20% for crypto, 25% for most other categories) is designed to tighten spreads in active categories. Neither platform has uniformly better liquidity across all market types.

Ready to open a US-regulated prediction market account?

Kalshi is the established CFTC-regulated exchange with USD deposits, formula-based fees, and Combos.

Open a Kalshi account →

Keep reading

Educational content only. This article is for informational purposes and does not constitute financial, legal, or tax advice. Fee formulas are based on platform documentation verified April 2026 and may change. Prediction market trading carries significant risk of loss. Regulatory status summaries reflect publicly available information and may not capture all nuances of current law or platform terms. Always consult a qualified professional before making financial decisions. ChanceMetrics may earn a referral commission if you open an account through links on this page.