Last verified: 01 Aug 2026
Kalshi vs Polymarket (2026): Fees, Markets, Liquidity, and Monitoring
Kalshi is a CFTC-regulated US exchange that settles in US dollars. Polymarket is a blockchain-based market that settles in USDC and has historically restricted US retail access. Both publish public APIs and list overlapping events, so the same question can carry two prices. This page compares them neutrally and shows how to watch both.
What are the stable differences between Kalshi and Polymarket?
The durable, publicly stated distinctions are regulatory model, settlement currency, and access model. Kalshi is a CFTC-regulated designated contract market in the United States and settles in USD. Polymarket is blockchain-based, settles in USDC, and has historically limited US retail access. Those facts change slowly and are the fair basis for a comparison.
Everything more granular, such as exact market counts, current trading volumes, and fee schedules, moves with the news cycle and the venues' own product decisions. Rather than quote a number that would be wrong by next month, this page describes those dimensions qualitatively and points you to each venue's own site as of the last-verified date.
Kalshi vs Polymarket compared (regulation, settlement, access, API)
| Dimension | Kalshi | Polymarket |
|---|---|---|
| Regulation | CFTC-regulated US designated contract market | Blockchain-based market, not a US-regulated exchange |
| Settlement currency | US dollars | USDC |
| Account / KYC model | US-regulated exchange account with identity verification | Wallet-based, with historically restricted US retail access |
| Market breadth | Broad book across politics, economics, and current events (specific counts change; read the venue as of the last-verified date) | Broad book across politics, economics, and current events (specific counts change; read the venue as of the last-verified date) |
| Public API | Yes, public API for market data | Yes, public API for market data |
| Typical use | US traders wanting a regulated, USD-settled venue | Traders using a USDC-settled, blockchain-based venue |
Volatile figures (market counts, volumes, fees) are described qualitatively and are accurate as of the last-verified date: 01 Aug 2026. Read each venue's own site for current numbers.
How do the two venues handle regulation and settlement?
Kalshi runs as a CFTC-regulated exchange, which is the point most often cited by US traders who want a regulated, USD-settled venue. Settlement in US dollars and identity verification at the account level follow from that model.
Polymarket is structured differently. It is blockchain-based, settles positions in USDC, and its access model has historically restricted US retail participation. Traders choose it for the USDC-settled, wallet-based structure. Neither model is presented here as better; they are different, and the right one depends on where you are and what you want to trade.
Do both venues have an API for market data?
Yes. Both Kalshi and Polymarket publish public APIs, which is why third-party dashboards and monitoring tools can read prices from each. An API gives you raw data, not judgment. You still have to define what counts as an unusual move, run the polling, avoid duplicate alerts, and keep a record of outcomes.
That build-versus-buy line is mostly about attention, not code. A script that reads prices is a weekend. Keeping baselines honest across two venues, dispatching one clean alert per event, and archiving results is the part that quietly becomes a standing job.
How do traders watch both venues at once?
The same event is often listed on both Kalshi and Polymarket, and when it is, the two prices can diverge. That gap is the arbitrage story: the same question, two prices, on two venues with different structures. Watching one venue in isolation misses half of it.
The practical answer is to monitor both from one place. TruthPing puts monitors on live markets across both venues, checks prices every 30 seconds, and fires on five user-set alert types: repricing beyond a market's own 7-day baseline, band breach, a set price level, a volume surge, and a large single trade. One alert per event goes to Telegram with the receipt: price at the move, price now, spread, depth, and detection latency. Everyone starts on the shipped default index, the top 75 markets by order-book depth across both venues, fully editable. Read-only throughout: no custody, no wallet connection, no execution.
If the price gap itself is what you want to understand, the arbitrage hub covers why the same event trades at two prices and how the gap opens and closes.
Frequently asked questions
Which is bigger, Kalshi or Polymarket?
Relative size shifts with the news cycle and with which markets are live, so a single number would be out of date fast. As of the last-verified date, both run large, actively traded books across politics, economics, and current events, and leadership on volume moves between them depending on the event. Read each venue's own public data for the current picture rather than a stale headline figure.
Is Kalshi regulated in the US?
Kalshi operates as a CFTC-regulated designated contract market in the United States and settles in US dollars. That regulatory status is the stable, published distinction most often cited when the two venues are compared. Specific product listings and rules change over time, so check Kalshi's own site for what is currently offered.
How is Polymarket different from Kalshi structurally?
Polymarket is a blockchain-based market that settles in USDC, and it has historically restricted US retail access. Kalshi is a US-regulated exchange settling in USD. Those are the durable structural differences: settlement currency, regulatory model, and access model. Everything more granular is subject to change and should be read from each venue.
Do both Kalshi and Polymarket have a public API?
Yes. Both venues publish public APIs for market data, which is why third-party dashboards and monitoring tools can read prices from each. The APIs give you raw data, not judgment. You still decide what counts as an unusual move and build alerting on top, or use a tool that already does.
Can the same event be listed on both venues?
Often, yes. Major elections, economic prints, and headline events frequently appear on both Kalshi and Polymarket. When they do, the two prices can differ, and that gap is the practical reason traders watch both venues at once rather than one in isolation.
Why watch both Polymarket and Kalshi together?
Because the same question can carry two different prices. Watching both from one place lets you see the gap as it opens and closes, and see which venue repriced first on shared news. TruthPing monitors markets on both venues, checks prices every 30 seconds, and sends one alert per event to Telegram with the full receipt.
Is TruthPing affiliated with Kalshi or Polymarket?
No. TruthPing is an independent, read-only monitoring product. It reads public market data from both venues, holds no custody, connects no wallet, and executes nothing. It is strictly observational and never says which way to trade.
Related
- Why do the same events trade at different prices on Polymarket and Kalshi?
- How do you get price alerts on Polymarket and Kalshi?
- What does it mean to monitor a prediction market?
- Which tools monitor Polymarket and Kalshi prices?
For informational purposes only. Not financial advice.