The best prediction market analytics for traders
By Faizan Ahmad. Updated .
Tradytics Probabilities reads every live finance question on Kalshi and Polymarket and turns it into charts: the S&P 500 outlook as a fan of where people expect the index at the next close, Friday, month end, three months and year end, with jobs, CPI and Fed dates marked on the time line; a page per question with the chance of each outcome and where it is likely to land; the index close questions scored against the last 30 sessions; and earnings-beat questions beside each stock's past report-day moves. It is built on an archive of 5.95 million Kalshi and Polymarket markets and 41.4 million trades back to June 2021, settled ones included, and the same data feeds the backtester and the Pro API. Free shows the S&P 500 and Nasdaq; Plus ($39) and Pro ($69) show every stock and report. Unusual Whales covers Polymarket only, Quiver shows large Polymarket trades and a Kalshi macro page, and TrendSpider puts Kalshi and Polymarket chances on its charts.
Prediction market analytics compared
Each rival's side is from its own pages, checked November 5, 2026.
| Tool | Kalshi | Polymarket | What it shows | History | Price | API |
|---|---|---|---|---|---|---|
| Tradytics Probabilities | Yes | Yes | S&P 500 outlook to year end, every finance question's chances, index closes scored over 30 sessions, earnings questions with past report-day moves | 5.95 million markets since June 2021, settled ones included | Free for the S&P 500 and Nasdaq; every stock from $39 | In Pro ($69), with MCP |
| Unusual Whales: Unusual Predictions | No | Yes | Potential-insider scanner, smart-money scores, whale trades, alerts | Not stated | Free tier, or $17 to $20 a month alone; in Retail Pro ($75) and Max ($120) | 10 endpoints, from API Basic ($150) |
| Quiver Quantitative | A macro page: inflation and fed funds expectations | A page of large trades | Large Polymarket trades by market and wallet; Kalshi-implied macro expectations | Not stated | Not stated for these pages | Polymarket trades from $30 |
| TrendSpider | Yes | Yes, the top 20 markets | Live chances as chart indicators, free in its store | Not stated | Plans from $89 | No data API |
| Kalshi and Polymarket | Each runs its own site, with raw prices for its own markets | |||||
Benzinga covers Kalshi and Polymarket in news articles. Cheddar Flow, Quant Data, Bullflow, SpotGamma, MenthorQ, OptionStrat, Market Chameleon, Barchart, TradeAlgo, Trade Ideas, Koyfin, TradingView and Finviz have no prediction market product.
Tradytics Probabilities
- The S&P 500 outlook. Three months of daily candles, then a fan of where Kalshi and Polymarket put the index at each date they price, darkest where people put the most weight. See what prediction markets say about the S&P 500.
- Every finance question. Index closes and ranges, single stocks and earnings beats, each with the chance of every outcome and where it is likely to land.
- What happened, not only what is likely. The index close questions scored against where the index actually closed over the last 30 sessions. More in how accurate prediction markets are.
- A settled archive. 5.95 million markets and 41.4 million trades back to June 2021, both venues, settled ones included.
- In the backtester. A Kalshi Fed question can drive a stock or options strategy, tested on real option quotes. The backtester.
- By API and on dashboards. The same questions, chances and archive on the Pro key and MCP server, and as a widget among 56 on custom dashboards. Prediction market data API.
Probabilities sits in the same app as clean options flow, ranked dark pool prints, Signals from a 560 million combination study and the Tradytics AI Fund, so a question's chances read beside the flow in the same names. More on Probabilities.
The other tools
- Unusual Whales: Unusual Predictions, built with Polymarket and Hashdive, scores Polymarket traders from -100 to 100, flags possible insiders and lists whale trades, with alerts and an API. It does not cover Kalshi. Tradytics vs Unusual Whales.
- Quiver Quantitative: a page of large Polymarket trades, an API endpoint for them filterable by market and wallet, and a Kalshi page of market-implied inflation and fed funds expectations. Tradytics vs Quiver Quant.
- TrendSpider: free indicators that stream Kalshi and Polymarket chances onto its charts, including any Kalshi market. Tradytics vs TrendSpider.
- Kalshi and Polymarket: each venue runs its own site with raw prices for its own markets.
Bottom line
For chances on every finance question across both Kalshi and Polymarket, an S&P 500 outlook to year end, a settled archive of 5.95 million markets, and the same data in a backtester and an API, Tradytics Probabilities has the most. Unusual Whales is the choice for tracking Polymarket wallets, and TrendSpider for seeing chances on a price chart.
Common questions
Which tools cover both Kalshi and Polymarket?
Tradytics Probabilities covers both as analytics, with 5.95 million markets since 2021. TrendSpider puts both on its charts as indicators, and Quiver has Polymarket trades and a Kalshi macro page. Unusual Whales covers Polymarket only.
What do prediction markets think the S&P 500 will do?
Tradytics Probabilities draws it live: where Kalshi and Polymarket put the index at the next close, Friday, month end, three months and year end, at tradytics.com/probabilities, free.
How much prediction market history is there?
Tradytics keeps 5.95 million Kalshi and Polymarket markets and 41.4 million trades back to June 2021, settled ones included, in the app, the backtester and the API.
Is there a prediction market data API?
Yes. Tradytics Pro ($69) serves Kalshi and Polymarket questions, chances and the settled archive. Unusual Whales serves Polymarket from its $150 API plan, and Quiver serves large Polymarket trades from $30.
Can I backtest a strategy on prediction market data?
On Tradytics, yes: Kalshi and Polymarket markets since 2021 are in the backtester, so "hold SMH when the Fed question favors a cut" is a one-line test. 1 backtest a day on Free, 5 on Plus, 25 on Pro.