Lines.com launched a public accuracy tracker at lines.com/accuracy. The Lines Accuracy Tracker scores every prediction market covered on Lines.com after resolution. Current headline accuracy stands at 94.7% on confident calls across 91,094 resolved markets.
The Lines Accuracy Tracker exists so readers can verify whether prediction markets price real events correctly. The tracker updates automatically after every market resolves. No editorial judgement gets added.
Every figure above refreshes live on the Lines Accuracy Tracker page.
Lines.com publishes prediction market content across ten categories: politics, sports, crypto, finance, culture, tech, science, elections, economy, and world events. Every market covered on Lines.com enters the Lines Accuracy Tracker after resolution. The Lines Accuracy Tracker stores the market-implied probability at publication and the final outcome.
The full sample spans Polymarket markets from both binary (Yes/No) and multi-outcome event types. Coverage runs from Lines.com launch in Q1 2026 through April 2026.
The Lines Accuracy Tracker uses the Brier score. Brier score measures prediction accuracy as (probability minus outcome) squared. A Brier score of 0 is perfect. A Brier score of 0.25 matches random guessing. Lower Brier scores indicate better accuracy.
A market counts as “correct” when the market priced an outcome at 60% or higher and the outcome occurred. Markets priced between 45% and 55% get classified as coin flips. Coin flips sit outside the headline accuracy rate to avoid distorting the number with genuine toss-ups.
For reference, superforecasters from the Good Judgment Project typically score Brier between 0.15 and 0.20. Lines.com prediction market coverage averages 0.224 across the full 91,094-market sample.
Science markets score the highest accuracy because scientific outcomes resolve deterministically once evidence lands. Sports markets price with very high confidence in the final minutes of a game, which boosts the confident-call sample. Elections markets trail the leaderboard because election outcomes concentrate high-stakes calls into a small number of high-variance events.
A well-calibrated prediction market resolves in line with the stated probability. When Polymarket prices an event at 70%, that event should occur roughly 70% of the time. The calibration chart on the Lines Accuracy Tracker tests calibration directly by grouping resolved markets into probability buckets.
The current calibration chart shows prediction markets pricing tightly at the 90%+ bucket. Mid-range buckets (40% to 60%) show wider dispersion, which matches the coin-flip rationale behind the headline methodology.
Lines.com publishes content grounded in Polymarket prices. A reader who uses Lines coverage to size up an event needs to know whether prediction markets track reality. The Lines Accuracy Tracker answers that verification question with a public scoreboard.
The Lines Accuracy Tracker also exposes where prediction markets miss. Coin flips resolve like coin flips. Election markets post lower accuracy than sports. Readers can weight Lines coverage by category accordingly.
The Lines Accuracy Tracker does not forecast future events. Every score reflects outcomes that already resolved.
Lines.com ships a free embed widget alongside the Lines Accuracy Tracker. Publishers can add one line of code to display the current Lines.com accuracy stat. The embed widget auto-updates after every resolution. Visit lines.com/accuracy and click “Get the embed code” to install the widget.
The embed widget suits finance blogs, sports analytics sites, political newsletters, and academic publications citing prediction-market research.
Lines.com will publish a quarterly Accuracy Review starting Q2 2026. The Accuracy Review will break down category performance, flag calibration drift, and compare Polymarket pricing against polling and expert-forecaster benchmarks. Subscribers to the Lines newsletter receive the Accuracy Review on publication.
For readers who want a daily signal: the Lines Accuracy Tracker home refreshes after every market resolution, and the recent-resolutions feed surfaces the last 20 scored outcomes.
Visit the Lines Accuracy Tracker to explore the full calibration chart, category breakdown, and recent-resolutions feed.
Probabilities shown are market-implied and not predictions or recommendations. This content is for informational purposes only.
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