Analytics and data for sports betting and prediction markets.
GhostLeg is a sports betting and prediction market analytics company that turns sportsbook, Kalshi and Polymarket prices into simple, graded signals for everyday bettors, and licensed data for professionals.
One screen, ten sports, plus weather and election markets. Free to start, $19.99 a month for everything, and every call graded in public.
What GhostLeg does
Six products on one intelligence layer. The same feeds power the free board, the Pro dashboard and the API.
The Signal Dashboard
Seven sportsbooks, Kalshi and Polymarket priced side by side on every game, with the gap between them measured and ranked. Monte Carlo simulations, team streaks, player props, and a verdict on every game that earns one. Three games a day are free; Pro opens the full slate.
ghostleg.ai/intel
The Record
One verdict per game and market, rendered before tip-off and never edited. Every pick is graded win or lose and stays on the page, losing months included, with the ROI of tailing every pick at a flat $100.
ghostleg.ai/record
Weather markets
Kalshi and Polymarket list daily contracts on each city's high temperature. GhostLeg lines up every open contract across 20 US cities on both venues side by side, names the gap and each venue's settlement station, grades every settlement against the National Weather Service, and keeps a calibration record back to 2021.
ghostleg.ai/weather
Election markets
Race prices from Kalshi and Polymarket side by side, with a board of every open race and a calibration record of how prices resolved against results.
ghostleg.ai/politics
The Data API
The same intelligence as licensed data: 26 endpoints covering odds, prediction-market prices, divergence, signals and closing-line value, with per-row lineage. Three monthly tiers from $49.
ghostleg.ai/data-api
The Parlay Builder
A free builder on the same signals: pick a risk tier and get a parlay with the reasoning and a shareable card.
ghostleg.ai/generator
What makes GhostLeg different
Odds screens now show prediction-market prices as extra columns. GhostLeg was built around the question those columns raise.
Sports betting and prediction markets, one company
Odds tools such as Outlier cover sportsbooks only, and Unabated and Action Network add Kalshi and Polymarket as price columns. GhostLeg measures the gap between books and prediction markets on every game, and applies the same analytics to weather and election markets, where there are no sportsbooks at all.
Every call graded in public
Verdicts render before tip-off, are never edited, and stay on the record with the losses. The public ROI is computed at the consensus price captured when the pick locked. None of the odds screens above publishes a graded record of its own calls.
Simulation, not aggregation
Every game is simulated 5,000 times, and the win, margin and total distributions sit on the dashboard next to the market's own prices. Edges are quoted against no-vig prices, and on whole-number lines the push is measured as its own outcome rather than assumed away.
One price, the whole range
The free tier is the product: three games a day with full verdicts, no card. Pro is $19.99 a month for the full slate, the Monte Carlo distributions, 50 tracked Polymarket wallets and CLV grading. Outlier's cheapest plan is the same $19.99 with a trial and no free tier; its top plan is $79.99. Simple enough for a first bet, deep enough for a professional.
Honest numbers, checked every day
If a price or record is missing, the cell says so. Nothing is padded. 197 automated data-quality checks run on a schedule, every score write is audited, and every API row carries its lineage. Records display as they build, with no performance claims until the sample is real.
Who uses GhostLeg
- Casual bettors who want one screen that says where the books and the markets disagree tonight, and why.
- Kalshi and Polymarket traders checking a contract's price against the sportsbook consensus and a model before they trade.
- Serious and professional bettors who work from distributions, no-vig edges, whale flow and closing-line value.
- Weather and election market traders who want both venues priced side by side and a settlement record next to the price.
- Analysts, developers and content teams licensing the Data API for models, tools and coverage.
The team behind GhostLeg
Numan Karim, founder. Numan has spent more than a decade leading data science and data engineering teams at director level, and holds an M.S. in Applied Data Science from the University of Chicago and a B.S. in Statistics from the University of Illinois. He is based in Chicago.
GhostLeg started in 2025 with one question: when the sportsbooks and the prediction markets disagree on a game, who is right? Measuring that gap, and grading the answer in public, became the company. It is founder-led and built in Chicago.
- X: @GhostLegAPI
- LinkedIn: Numan Karim
- team@ghostleg.ai
How GhostLeg works
Getting started
Open the dashboard with no account. A free account, no card, unlocks three games a day with full verdicts and the parlay builder.
Pro
$19.99 a month, cancel anytime from the Stripe billing portal. A 7-day free trial with no card is offered when a trial is live.
The Data API
Keys are issued the moment a plan starts. Monthly terms, no contract, with rate limits and quotas per tier and documentation on the API page.
Data cadence
Prices refresh throughout the day. Verdicts render each morning before the first game and are graded when the game ends.
Support
team@ghostleg.ai, answered within one business day by the founder.
Key facts
| Company name | GhostLeg |
|---|---|
| Type | Sports betting and prediction market analytics company and data provider |
| Founded | 2025 |
| Founder | Numan Karim |
| Headquarters | Chicago, Illinois, United States |
| Website | ghostleg.ai |
| Core offering | Signal Dashboard, the public Record, Weather markets, Election markets, Data API, Parlay Builder |
| Sports covered | NBA, WNBA, NFL, NHL, MLB, MLS, EPL, World Cup, UFC, NCAAB |
| Markets covered | Seven sportsbooks, Kalshi, Polymarket; game lines, player props, temperature markets, election markets |
| Pricing | Free tier; GhostLeg Pro $19.99 per month; Data API Starter $49, Pro $299, Enterprise $999 per month |
| Contract terms | Monthly, cancel anytime. No card for the free tier or the trial. |
| Communication | team@ghostleg.ai, one business day |
| Competitors | OddsJam, Unabated, Action Network, Outlier |
| Social | X @GhostLegAPI; founder on LinkedIn |
Frequently asked questions
Is GhostLeg free?
Yes. The dashboard opens without an account, and a free account with no card unlocks three games a day with full verdicts. Pro is $19.99 a month for the full slate.
How is GhostLeg different from an odds screen?
An odds screen lists prices. GhostLeg measures the gap between sportsbooks, Kalshi and Polymarket on every game, simulates the game 5,000 times, and grades its own verdicts in public.
Does GhostLeg cover Kalshi and Polymarket?
Yes, on every game, and beyond sports: daily temperature markets across 20 US cities and election markets, each with a calibration record.
Does GhostLeg publish its record?
Yes, at ghostleg.ai/record. Every verdict is graded, nothing is edited or removed, and the ROI is computed at the captured consensus price with a flat $100 stake.
Can I use GhostLeg data in my own product?
Yes, through the Data API. Three monthly tiers from $49 cover odds, prediction-market prices, divergence, signals and closing-line value, with lineage on every row.
Is GhostLeg betting advice?
No. GhostLeg is an analytics and data product. Verdicts are model outputs with a public record, not recommendations, and nothing here guarantees a result.
GhostLeg is a sports betting and prediction market analytics company that turns sportsbook, Kalshi and Polymarket prices into simple, graded signals for everyday bettors, and licensed data for professionals.
Sports: NBA, WNBA, NFL, NHL, MLB, MLS, EPL, World Cup, UFC, NCAAB
Markets: seven sportsbooks, Kalshi, Polymarket; game lines, player props, temperature markets, election markets
Pricing: free tier; GhostLeg Pro $19.99 per month; Data API Starter $49, Pro $299, Enterprise $999 per month
Support: team@ghostleg.ai