PREDICTWIRE · LIVEGavin Newsom win the 2028 Democratic presidential nomination: 28% ▲ 0.4Atletico Madrid win the 2025–26 Champions League: 12% ▼ 0.2the San Antonio Spurs win the 2026 NBA Finals: 15% ▲ 0.1Iran x Israel/US conflict ends by April 7: 87% ▲ 0.8Gavin Newsom win the 2028 US Presidential Election: 17%Netherlands win the 2026 FIFA World Cup: 3% ▼ 0.1the Colorado Avalanche win the 2026 NHL Stanley Cup: 23% ▲ 1.1J.D. Vance win the 2028 Republican presidential nomination: 39% ▲ 0.8the U.S. invade Iran before 2027: 30% ▼ 2.0PREDICTWIRE · LIVEGavin Newsom win the 2028 Democratic presidential nomination: 28% ▲ 0.4Atletico Madrid win the 2025–26 Champions League: 12% ▼ 0.2the San Antonio Spurs win the 2026 NBA Finals: 15% ▲ 0.1Iran x Israel/US conflict ends by April 7: 87% ▲ 0.8Gavin Newsom win the 2028 US Presidential Election: 17%Netherlands win the 2026 FIFA World Cup: 3% ▼ 0.1the Colorado Avalanche win the 2026 NHL Stanley Cup: 23% ▲ 1.1J.D. Vance win the 2028 Republican presidential nomination: 39% ▲ 0.8the U.S. invade Iran before 2027: 30% ▼ 2.0

Author: pw_admin

  • Case Study: Will Zohran Mamdani win the 2025 NYC mayoral election? — How Polymarket’s Price Moved

    Resolved case study · The Market Got It Right

    Will Zohran Mamdani win the 2025 NYC mayoral election?

    Resolved Yes at 91.0% after $143.3M in trading volume.
    Brier score 0.0082. Other category.

    What is this?
    A resolved Polymarket contract from our archive. We replay the Wire Score against the price at close and at the midpoint, then show what Wire would have called and how that call paid off.

    The bottom line
    A textbook case of the market being right from the start.

    Receipt · Wire at close

    What Wire called vs. what happened

    CALIBRATED
    Wire called the price CALIBRATED at close (signal 53). The market resolved YES.
    Closing price
    95.8%
    market at resolution

    Wire point
    97.0%
    calibrated read

    Wire Signal
    53
    CALIBRATED

    Outcome
    Yes
    Brier 0.0082

    Price trajectory

    How the market moved over 197 snapshots

    Five checkpoints across the contract’s life. Full daily-snapshot range: 3.5–95.8%.

    Checkpoint Date Yes price
    Start Apr 23, 2025 9.5%
    25% in Jun 11, 2025 23.2%
    Halfway Jul 30, 2025 76.3%
    75% in Sep 17, 2025 84.2%
    Close Nov 05, 2025 95.8%
    At close

    Wire Score detail

    Closing market price 95.8%
    Wire Score point 97.0%
    Confidence band (B) 93.3–100.0%
    Grade B
    Wire Signal 53 · CALIBRATED
    Actual outcome Yes
    Brier score 0.0082
    Mid-life snapshot · Jul 30, 2025

    What Wire would have said halfway through

    Not a live forecast — a backward-looking illustration of what the Wire Score would have produced at this midpoint, using only information available then.

    Market price 76.3%
    Wire Score point 59.8%
    Confidence band (C) 52.9–66.7%
    Grade C
    Wire Signal 25 · NO VALUE
    Wire’s side NO
    $100 on Wire’s side → realized P&L $-100
    Archive context

    What the archive says about markets like this

    This market is one of 1,914 resolved binary contracts in the PredictWire Calibration Archive. A Polymarket contract with lifetime volume of $143.3M sits in the top tier of archive volume — very liquid markets have a volume-weighted Brier of 0.0665 across the archive, compared to 0.0865 for the full set. Liquidity matters for calibration.

    The Wire Score framework uses every (price, outcome) pair in the archive to calibrate raw prices into probabilities and to assign a letter grade based on confidence-band width. v2 fits a separate calibration curve per category (politics, sports, crypto, geopolitics, other) and falls back to a global curve when a category is too thin. Across all 194,111 archive snapshots, Wire Score v2 improves Brier by +4.86% over raw prices (and +2.85% over v1) while remaining monotone across grades.

    About this page. Written and reviewed by The PredictWire Research Team under our Editorial Standards. Price data from Polymarket’s public CLOB; outcome data from Polymarket’s gamma-api. Methodology: /wire-score/. Last reviewed April 21, 2026. Corrections: corrections@predictwire.io.

  • Case Study: US forces enter Iran by April 30? — How Polymarket’s Price Moved

    Resolved case study · The Market Got It Right

    US forces enter Iran by April 30?

    Resolved Yes at 100.0% after $269.0M in trading volume.
    Brier score 0.0000. Other category.

    What is this?
    A resolved Polymarket contract from our archive. We replay the Wire Score against the price at close and at the midpoint, then show what Wire would have called and how that call paid off.

    The bottom line
    A textbook case of the market being right from the start.

    Receipt · Wire at close

    What Wire called vs. what happened

    CALIBRATED
    Wire called the price CALIBRATED at close (signal 50). The market resolved YES.
    Closing price
    100.0%
    market at resolution

    Wire point
    100.0%
    calibrated read

    Wire Signal
    50
    CALIBRATED

    Outcome
    Yes
    Brier 0.0000

    Price trajectory

    How the market moved over 11 snapshots

    Five checkpoints across the contract’s life. Full daily-snapshot range: 45.5–100.0%.

    Checkpoint Date Yes price
    Start Mar 20, 2026 54.5%
    25% in Mar 22, 2026 56.5%
    Halfway Mar 25, 2026 49.5%
    75% in Mar 27, 2026 61.5%
    Close Apr 09, 2026 100.0%
    At close

    Wire Score detail

    Closing market price 100.0%
    Wire Score point 100.0%
    Confidence band (A) 100.0–100.0%
    Grade A
    Wire Signal 50 · CALIBRATED
    Actual outcome Yes
    Brier score 0.0000
    Mid-life snapshot · Mar 25, 2026

    What Wire would have said halfway through

    Not a live forecast — a backward-looking illustration of what the Wire Score would have produced at this midpoint, using only information available then.

    Market price 49.5%
    Wire Score point 49.1%
    Confidence band (C) 38.9–59.4%
    Grade C
    Wire Signal 49 · CALIBRATED
    Wire’s side NO
    $100 on Wire’s side → realized P&L $-100
    Archive context

    What the archive says about markets like this

    This market is one of 1,914 resolved binary contracts in the PredictWire Calibration Archive. A Polymarket contract with lifetime volume of $269.0M sits in the top tier of archive volume — very liquid markets have a volume-weighted Brier of 0.0665 across the archive, compared to 0.0865 for the full set. Liquidity matters for calibration.

    The Wire Score framework uses every (price, outcome) pair in the archive to calibrate raw prices into probabilities and to assign a letter grade based on confidence-band width. v2 fits a separate calibration curve per category (politics, sports, crypto, geopolitics, other) and falls back to a global curve when a category is too thin. Across all 194,111 archive snapshots, Wire Score v2 improves Brier by +4.86% over raw prices (and +2.85% over v1) while remaining monotone across grades.

    About this page. Written and reviewed by The PredictWire Research Team under our Editorial Standards. Price data from Polymarket’s public CLOB; outcome data from Polymarket’s gamma-api. Methodology: /wire-score/. Last reviewed April 21, 2026. Corrections: corrections@predictwire.io.

  • Case Study: TikTok banned in the US before May 2025? — How Polymarket’s Price Moved

    Resolved case study · The Market Got It Right

    TikTok banned in the US before May 2025?

    Resolved Yes at 99.6% after $119.7M in trading volume.
    Brier score 0.0000. Other category.

    What is this?
    A resolved Polymarket contract from our archive. We replay the Wire Score against the price at close and at the midpoint, then show what Wire would have called and how that call paid off.

    The bottom line
    A textbook case of the market being right from the start.

    Receipt · Wire at close

    What Wire called vs. what happened

    CALIBRATED
    Wire called the price CALIBRATED at close (signal 51). The market resolved YES.
    Closing price
    99.6%
    market at resolution

    Wire point
    100.0%
    calibrated read

    Wire Signal
    51
    CALIBRATED

    Outcome
    Yes
    Brier 0.0000

    Price trajectory

    How the market moved over 126 snapshots

    Five checkpoints across the contract’s life. Full daily-snapshot range: 12.5–99.6%.

    Checkpoint Date Yes price
    Start Sep 19, 2024 29.5%
    25% in Oct 20, 2024 21.5%
    Halfway Nov 20, 2024 15.5%
    75% in Dec 21, 2024 36.5%
    Close Jan 22, 2025 99.6%
    At close

    Wire Score detail

    Closing market price 99.6%
    Wire Score point 100.0%
    Confidence band (A) 100.0–100.0%
    Grade A
    Wire Signal 51 · CALIBRATED
    Actual outcome Yes
    Brier score 0.0000
    Mid-life snapshot · Nov 21, 2024

    What Wire would have said halfway through

    Not a live forecast — a backward-looking illustration of what the Wire Score would have produced at this midpoint, using only information available then.

    Market price 19.0%
    Wire Score point 24.3%
    Confidence band (C) 17.9–30.6%
    Grade C
    Wire Signal 59 · LEAN YES
    Wire’s side YES
    $100 on Wire’s side → realized P&L +$426
    Archive context

    What the archive says about markets like this

    This market is one of 1,914 resolved binary contracts in the PredictWire Calibration Archive. A Polymarket contract with lifetime volume of $119.7M sits in the top tier of archive volume — very liquid markets have a volume-weighted Brier of 0.0665 across the archive, compared to 0.0865 for the full set. Liquidity matters for calibration.

    The Wire Score framework uses every (price, outcome) pair in the archive to calibrate raw prices into probabilities and to assign a letter grade based on confidence-band width. v2 fits a separate calibration curve per category (politics, sports, crypto, geopolitics, other) and falls back to a global curve when a category is too thin. Across all 194,111 archive snapshots, Wire Score v2 improves Brier by +4.86% over raw prices (and +2.85% over v1) while remaining monotone across grades.

    About this page. Written and reviewed by The PredictWire Research Team under our Editorial Standards. Price data from Polymarket’s public CLOB; outcome data from Polymarket’s gamma-api. Methodology: /wire-score/. Last reviewed April 21, 2026. Corrections: corrections@predictwire.io.

  • Case Study: Will Donald Trump be inaugurated? — How Polymarket’s Price Moved

    Resolved case study · The Market Got It Right

    Will Donald Trump be inaugurated?

    Resolved Yes at 99.2% after $400.4M in trading volume.
    Brier score 0.0001. Other category.

    What is this?
    A resolved Polymarket contract from our archive. We replay the Wire Score against the price at close and at the midpoint, then show what Wire would have called and how that call paid off.

    The bottom line
    A textbook case of the market being right from the start.

    Receipt · Wire at close

    What Wire called vs. what happened

    CALIBRATED
    Wire called the price CALIBRATED at close (signal 52). The market resolved YES.
    Closing price
    99.2%
    market at resolution

    Wire point
    100.0%
    calibrated read

    Wire Signal
    52
    CALIBRATED

    Outcome
    Yes
    Brier 0.0001

    Price trajectory

    How the market moved over 80 snapshots

    Five checkpoints across the contract’s life. Full daily-snapshot range: 53.8–99.5%.

    Checkpoint Date Yes price
    Start Nov 02, 2024 57.5%
    25% in Nov 21, 2024 95.0%
    Halfway Dec 11, 2024 96.2%
    75% in Dec 31, 2024 98.0%
    Close Jan 20, 2025 99.2%
    At close

    Wire Score detail

    Closing market price 99.2%
    Wire Score point 100.0%
    Confidence band (A) 100.0–100.0%
    Grade A
    Wire Signal 52 · CALIBRATED
    Actual outcome Yes
    Brier score 0.0001
    Mid-life snapshot · Dec 12, 2024

    What Wire would have said halfway through

    Not a live forecast — a backward-looking illustration of what the Wire Score would have produced at this midpoint, using only information available then.

    Market price 95.8%
    Wire Score point 97.0%
    Confidence band (A) 94.5–99.6%
    Grade A
    Wire Signal 54 · CALIBRATED
    Wire’s side YES
    $100 on Wire’s side → realized P&L +$4
    Archive context

    What the archive says about markets like this

    This market is one of 1,914 resolved binary contracts in the PredictWire Calibration Archive. A Polymarket contract with lifetime volume of $400.4M sits in the top tier of archive volume — very liquid markets have a volume-weighted Brier of 0.0665 across the archive, compared to 0.0865 for the full set. Liquidity matters for calibration.

    The Wire Score framework uses every (price, outcome) pair in the archive to calibrate raw prices into probabilities and to assign a letter grade based on confidence-band width. v2 fits a separate calibration curve per category (politics, sports, crypto, geopolitics, other) and falls back to a global curve when a category is too thin. Across all 194,111 archive snapshots, Wire Score v2 improves Brier by +4.86% over raw prices (and +2.85% over v1) while remaining monotone across grades.

    About this page. Written and reviewed by The PredictWire Research Team under our Editorial Standards. Price data from Polymarket’s public CLOB; outcome data from Polymarket’s gamma-api. Methodology: /wire-score/. Last reviewed April 21, 2026. Corrections: corrections@predictwire.io.

  • Polymarket Review: Everything You Need to Know in 2026

    Polymarket is the world’s largest crypto-native prediction market, and in 2026 it sits at the center of the event-trading ecosystem. If you’ve watched election night, followed a Fed rate decision, or tracked a major sporting outcome this year, odds are you saw a Polymarket number cited somewhere. This review walks through how Polymarket actually works, what it’s good at, where it falls short, and whether it belongs in your trading stack.

    Short answer: Polymarket is the deepest, most liquid prediction market on the planet, with billions in annual volume, on-chain settlement via USDC, and unmatched coverage of political, economic, and cultural events. For serious traders comfortable with crypto rails, it is indispensable. For casual US users who want a CFTC-regulated, fiat-native experience, Kalshi is typically the easier starting point.

    What Is Polymarket?

    Polymarket is a decentralized prediction market built on the Polygon blockchain. Users trade binary “Yes/No” shares in future events, with each share priced between $0.00 and $1.00 — the price itself representing the market-implied probability of the outcome. When the event resolves, winning shares pay out $1.00 and losing shares pay out $0.00.

    Unlike traditional sportsbooks, Polymarket is a peer-to-peer exchange. You are trading against other users, not against the house. That structure is why Polymarket’s odds are widely used by journalists, economists, and analysts as a real-time signal of crowd belief — there’s no bookmaker margin distorting the number.

    How Polymarket Works

    Trading on Polymarket looks and feels a lot like trading stocks or crypto, but with binary outcomes:

    • Deposit USDC on the Polygon network (Polymarket supports credit/debit onramps and direct crypto transfers).
    • Pick a market — say, “Will the Fed cut rates at the June 2026 meeting?”
    • Buy Yes or No shares at the current market price. A share bought at $0.67 pays $1.00 if it wins, a 49% return.
    • Hold or trade out — prices move continuously as news breaks, so you don’t have to hold to expiration. You can take profit (or cut losses) at any time.
    • Resolution is handled by UMA’s optimistic oracle, with a dispute window before payouts finalize.

    Because orderbooks are public and on-chain, every trade is transparent. That transparency is a core reason institutional researchers trust Polymarket’s numbers.

    Fees, Liquidity, and Market Depth

    Polymarket does not charge a per-trade commission. Its revenue comes from ecosystem activity rather than taker fees, which makes it one of the cheapest venues to express event-driven views. There is, however, a bid-ask spread to cross, and smaller markets can have wider spreads than liquid flagship contracts.

    In 2026, Polymarket routinely supports eight-figure volumes on flagship markets. Political, macroeconomic, and major sports contracts typically trade with spreads of one to two cents — tight enough that even active day-trading strategies remain viable. Niche markets (obscure policy questions, long-tail sporting events) can be thinner, so position sizing matters.

    Polymarket in the United States

    Polymarket’s US story changed significantly in 2025. After years of offshore-only access, the platform secured a path to US participation through an acquisition of a CFTC-registered designated contract market. For US residents, that means legal, compliant access to a subset of Polymarket markets — though the full international catalog remains broader than what’s offered domestically.

    If you’re a US user deciding between platforms, the practical split usually looks like this:

    Feature Polymarket Kalshi
    Regulation CFTC-registered DCM (US tier) CFTC-regulated DCM
    Settlement currency USDC (crypto) USD (fiat)
    Market breadth Extremely wide; culture, politics, crypto, sports Broad; strongest in economics, politics, sports
    Liquidity on flagships Deepest in the industry Deep and growing fast
    Fee model No commission; spread-based Per-contract trading fee
    Best for Crypto-native traders, macro/politics power users Fiat-native US retail and institutional traders

    What Polymarket Does Best

    Three categories stand out in 2026:

    • Political and election markets. From national elections to individual Senate races, Polymarket consistently offers the widest menu and the deepest liquidity. Its odds are frequently cited by major outlets as a benchmark.
    • Macroeconomic contracts. Fed rate decisions, CPI prints, recession odds, and GDP outcomes all trade with institutional-grade depth. These are the markets most often used for actual hedging.
    • Cultural and “will-it-happen” markets. Movie box office, award shows, tech launches, and geopolitical flashpoints — categories that simply don’t exist on traditional exchanges — are a Polymarket signature.

    Risks and Things to Know Before You Trade

    No prediction market is risk-free, and Polymarket has a few specifics worth understanding:

    • Resolution risk. Markets settle based on UMA’s optimistic oracle. The overwhelming majority resolve cleanly, but ambiguously worded contracts can occasionally see disputes. Read the resolution criteria before sizing up.
    • Crypto infrastructure. Even with improving onramps, you’re still interacting with a Polygon wallet. That’s a feature for crypto-native users and a learning curve for everyone else.
    • Tax treatment. Gains on prediction market contracts are taxable events in the US. Keep records and consult a professional.
    • Behavioral risk. Continuous pricing and 24/7 markets make it easy to overtrade. Treat prediction markets like any other speculative instrument: risk what you can afford to lose.

    Is Polymarket Worth It in 2026?

    For any trader, analyst, or informed observer who cares about event probabilities, yes — Polymarket is worth a seat at the table. Its liquidity, breadth, and transparency make it the clearest market-based signal of what the world collectively expects. For hands-on traders, the zero-commission structure and tight spreads on flagship contracts make it genuinely cost-competitive.

    The honest caveat: if you want a pure-fiat, US-regulated, “feels like a brokerage” experience, Kalshi is the more frictionless path. Many of the most sophisticated prediction market traders we cover at PredictWire use both platforms and arbitrage the differences.

    Where to Trade

    Ready to get started? Open accounts at both top platforms and compare them head-to-head:

    For a full side-by-side of every major prediction market — fees, jurisdictions, product breadth, and liquidity — see our updated Best Prediction Markets of 2026 rankings.

  • Political Prediction Markets: Senate and House Odds as of April 21, 2026

    Political Prediction Markets: Senate and House Odds as of April 21, 2026

    With the November midterms just over six months out, political prediction markets are sharpening into focus. Traders on Kalshi and Polymarket are pricing in a divided Congress, with Republicans modestly favored to hold the House and a tight, toss-up fight for control of the Senate. Volume has more than doubled in the past two weeks as campaign fundraising reports and primary results start shaking loose the spring’s conventional wisdom.

    Here’s where the biggest political contracts stand as of April 21, 2026, and the moves smart money is watching into May.

    Senate Control: A True Coin Flip

    The headline contract — “Which party will control the US Senate after the 2026 election?” — is trading at 52% Republican, 47% Democrat on Kalshi, with about one percentage point of spread eaten by the “other/tie” outcome. Two weeks ago, Republicans were at 58%. The compression reflects two things: stronger-than-expected Democratic fundraising in Q1, and a run of favorable generic-ballot polling for Democrats after the most recent CPI print came in hotter than forecast.

    The individual seat markets tell a more granular story:

    • Ohio: Republicans favored at 71% to hold the open seat. This is the single biggest structural advantage of the cycle for the GOP.
    • Pennsylvania: Democrats favored at 58%. The incumbent has led in every public poll released since February.
    • Arizona: Toss-up at 51% Democrat / 48% Republican. Markets see this as the likely tipping-point seat.
    • Montana: Republicans at 64%. Trending GOP as the Democratic recruit has struggled to raise money.
    • Nevada: Democrats at 55%, essentially unchanged for a month.

    The implied math: Republicans need a net gain of one seat for the majority. Markets are effectively pricing Montana as likely flip, Nevada as likely hold, and Arizona as the coin flip that decides control.

    House Control: Republicans Favored, but Narrowing

    “Which party will control the US House after the 2026 election?” is at 56% Republican, 43% Democrat on Polymarket — a 12-point GOP edge, down from 19 points in mid-March. The generic ballot has tightened to roughly R+1.5, inside the historical margin where the out-party tends to gain seats in a midterm against an unpopular administration.

    The most-traded House sub-contracts right now:

    • Will Democrats net 5+ seats? Trading at 48%, up sharply from 31% on April 1.
    • Will the House flip? 43%, mirroring the headline contract.
    • Will either party exceed 230 seats? 22%, reflecting trader skepticism of any wave scenario.

    The biggest single-district markets continue to cluster around the New York and California suburban battlegrounds that decided the 2024 map. California’s 13th district is the most-traded individual House contract on Kalshi this week, with Democrats favored at 61%.

    Governor Races: Quieter, but Sharp Moves in Three States

    Gubernatorial markets carry less volume than federal races, but three are worth watching:

    • Georgia: Open seat after term limits. Republicans at 62%, down from 70% a month ago as the GOP primary has turned unexpectedly competitive.
    • Pennsylvania: Democrats at 67% for re-election. The popular incumbent has no serious primary challenge and holds a consistent polling lead.
    • Arizona: Republicans at 54%. The closest governor’s race in the country, and one of the better value plays on the board if you think Senate dynamics bleed down-ballot.

    What Traders Are Missing

    Two things worth flagging for anyone sizing positions into May.

    First, the historical base rate for a first-term president’s party in the midterms is a loss of roughly 25 House seats. Prediction markets are currently pricing something closer to a loss of 8 to 12 seats. Either markets are right that this cycle is unusually stable, or they’re underpricing the tail risk of a normal midterm correction. There’s no middle ground, and the 60-day window after Memorial Day is when that question usually resolves.

    Second, Senate map asymmetry gets less attention than it deserves. Democrats are defending more competitive seats than Republicans, which is why even a modestly pro-Democratic national environment may not be enough to flip the chamber. Traders pricing Senate control as a true 50/50 may be giving Democrats too much credit for the generic ballot.

    Where to Trade

    The deepest liquidity for US political contracts is on Kalshi, which has CFTC approval for election markets and is the only fully-regulated venue for American traders. Polymarket offers broader international political markets and typically carries tighter spreads on headline contracts like overall Senate and House control.

    For a full breakdown of each platform’s strengths, fees, and available markets, see our ranked guide to the best prediction markets of 2026.

    We’ll update these numbers as the primary calendar accelerates in May. Expect significant moves in the Arizona and Pennsylvania Senate markets as candidate fields finalize.

  • How Accurate Are Prediction Markets, Really? We Built the Archive — 1,914 Resolved Contracts, 97.1% Right on Confident Calls

    The most common question we get at PredictWire is “do prediction markets actually work?” Until today our answer relied on the same handful of academic papers everyone else cites. Today we release the data ourselves: the PredictWire Calibration Archive, an open and reproducible measurement of Polymarket’s real-world forecasting accuracy across 1,914 resolved binary markets representing $30.48 billion in lifetime trading volume.

    The archive is built from 194,111 daily price snapshots pulled directly from Polymarket’s public CLOB endpoint, joined to each market’s actual resolved outcome. It is not a curated highlight reel. It is every market that closed with a clean Yes/No resolution and at least $100,000 in volume. The methodology is on the page; the underlying CSV is downloadable; every number can be recomputed from the raw data.

    The Headline Finding

    When prediction markets are confident, they are right. Across 1,341 contracts that closed at 80% Yes-or-higher or 20%-or-lower, the market’s directional pick was correct 97.1% of the time. That is the single number we keep coming back to. Confident calls resolve in the market’s favor almost 24 times out of 25.

    The Brier score across all 1,914 closing prices is 0.0865, against a naive 50/50 baseline of 0.25 and a base-rate baseline of 0.190. The implied skill score versus base rate is +0.544 — substantial. Volume-weighted, the Brier improves to 0.0665, which tells us high-volume markets are even better-calibrated than the unweighted average.

    The Reliability Picture

    A handful of decile buckets from the closing-price reliability table:

    Predicted N Mean Pred. Actual Yes
    0-10% 1,086 0.9% 1.2%
    30-40% 86 34.9% 39.5%
    50-60% 129 54.9% 47.3%
    70-80% 56 74.4% 75.0%
    90-100% 146 98.2% 99.3%

    That is what calibration looks like in practice. Markets pricing 90-100% Yes resolved Yes 99.3% of the time. Markets pricing 0-10% Yes resolved No 98.8% of the time. The full ten-bucket table is on the /accuracy/ page.

    What Markets Are Best At — and Worst At

    Categorized, the dataset shows a clean rank-order from most-calibrated to least:

    Category N Brier Directional
    economy 68 0.0064 100.0%
    sports 226 0.0339 95.1%
    politics 438 0.0419 93.2%
    crypto 182 0.0568 90.7%
    geopolitics 141 0.1205 82.3%
    other 856 0.1305 77.8%

    Economy markets are the best-calibrated class, with a Brier of 0.0064 and 100.0% directional accuracy across 68 contracts (mostly Fed decisions, where consensus converges to near-certainty). Other is the worst, at Brier 0.1305 and 77.8% directional. That is the catch-all category — niche sports lines, novelty contracts, and one-off events where the wisdom-of-crowds advantage is thinnest. Geopolitics — wars, peace deals, regime change — is the next-worst at Brier 0.12. Hard problems are hard, and the markets correctly know they’re hard.

    The Counter-Intuitive Finding

    The dataset reveals one finding that contradicts conventional wisdom: prediction markets are not most accurate at the moment of resolution. They are most accurate 90 to 180 days before resolution. The Brier score in the 0-1 day window is 0.10; the Brier in the 90-180 day window is 0.07. This isn’t a contradiction so much as a survivor-bias story — easy contracts effectively settle long before their nominal end date and stop contributing to the late-window snapshots, leaving only the residual hard markets. Read the late-stage Brier as “the markets that were genuinely contested to the wire.”

    Why We Built This

    The prediction market industry has always had a credibility problem. Every reviewer site claims their picks are “highly accurate”; nobody publishes the data. We are the first to publish ours. The full dataset, the full methodology, the full caveats — all on the /accuracy/ page. The CSV is downloadable. The metrics are reproducible. Send the worst confident calls to your friends; we did the work to find them.

    PredictWire will refresh the archive quarterly. The next update — adding Kalshi resolved contracts and PredictIt’s archive — is scheduled for July 2026. We will publish a transparent diff of every metric between runs.

    Read the Full Archive

    Trade These Markets

    Disclosure: PredictWire earns a commission on qualifying accounts opened through the links below. Our rankings and reviews are not influenced by these relationships. Full disclosure.


    About this article: Written and reviewed by The PredictWire Research Team under our Editorial Standards. Platform rankings follow our public Methodology. Prediction market contracts carry risk of total loss. Nothing here is financial advice. Corrections: corrections@predictwire.io.

  • Prediction Market Pulse — April 20, 2026: Fed Hold Is a Lock, 2028 Race Takes Shape, and Iran Thaw Priced as Slow Burn

    Prediction markets agree on one thing above all on April 20, 2026: the Federal Reserve is not cutting rates this month. Polymarket’s April-decision book has $122 million in combined volume and prices the “no change” outcome at 99.4%, with 50-basis-point cuts at 0.1%, 25-basis-point hikes at 0.2%, and 25-basis-point cuts at 0.4%. That is as tight a consensus as this venue produces on any monetary-policy contract, and it sets the tone for every other risk asset priced this week. Below, PredictWire’s snapshot of the markets that actually matter on a Monday morning.

    Markets at a Glance

    Pulled live from Polymarket on April 20, 2026. All probabilities are derived from the platform’s last trade price; volume is lifetime dollar turnover unless noted.

    Contract Yes % Volume
    No change in Fed rates after April 2026 meeting 99.4% $23.9M
    Gavin Newsom wins 2028 Democratic nomination 27.3% $24.4M
    J.D. Vance wins 2028 Republican nomination 39.2% $12.2M
    Bitcoin reaches $80,000 in April 2026 42.5% $4.7M
    San Antonio Spurs win 2026 NBA Finals 14.7% $19.9M
    US × Iran permanent peace deal by April 30, 2026 36.5% $5.9M
    US × Iran permanent peace deal by May 31, 2026 57.5% $2.6M

    Macro: The Fed Hold Is a Lock, But the Term Structure Still Tells a Story

    The April meeting is priced as a no-op, but the longer end of Polymarket’s rate book is where the information is. Traders will watch the FOMC statement closely for any change in language around “data dependency” versus “restrictive stance,” because the June and September decision contracts are where the real disagreement is. With $43.7 million in volume sitting on the 50+ basis-point cut contract at 0.1%, any hawkish surprise from Chair Powell would leave almost no one offside on this meeting — but it would reprice the curve.

    The broader takeaway: if you wanted confirmation that the “higher for longer” camp is still winning the rates debate, prediction markets are giving it to you unambiguously.

    Politics: Newsom Pulls Ahead, Vance Consolidates the GOP Side

    The 2028 presidential book on Polymarket is the most-traded political market on the platform and it has a clear story this week. Gavin Newsom’s 2028 Democratic nomination contract now sits at 27.3% with $24.4 million in lifetime volume — comfortably ahead of Alexandria Ocasio-Cortez at 8.2% ($12.5M) as the highest-volume challenger. On the Republican side, J.D. Vance’s nomination contract at 39.2% ($12.2M) is the plurality favorite but notably far below a lock.

    What the market is telling you: the Democratic field has consolidated around a single frontrunner earlier in the cycle than 2020 or 2024 saw, while the Republican side remains meaningfully open despite Vance’s incumbent-vice-president advantage. That is a structural edge for anyone trading the GOP book, where liquidity is thinner and mispricings of second-tier candidates are more likely.

    Crypto: Bitcoin’s $80,000 Target Is a Coin Flip, Downside Mostly Priced Out

    Polymarket’s April Bitcoin price contracts are telling a clean story. “BTC reaches $80,000 in April” trades at 42.5% with $4.7M volume; “BTC reaches $85,000” sits at 6.3%; “BTC dips to $65,000” sits at 6.5%. Translate that into a range: traders are pricing roughly an 86% probability that Bitcoin closes April between $65K and $85K, with a heavy skew toward the upper half of that band.

    The $80K level is the key one to watch in the next two weeks. If that contract breaks above 60%, it is a signal from the market that the resistance at current levels has cracked; a break below 30% means the bullish thesis for the month has failed.

    Geopolitics: The Iran Peace-Deal Term Structure Prices a Slow Thaw

    The single most interesting term-structure on Polymarket right now is the “US x Iran permanent peace deal” book. It has three strikes:

    • By April 22, 2026: 16.5% ($17.2M volume)
    • By April 30, 2026: 36.5% ($5.9M volume)
    • By May 31, 2026: 57.5% ($2.6M volume)

    That curve is how traders tell you “we think a deal is probably coming but not imminently.” The implied jump from 36.5% at end-April to 57.5% at end-May — a 21-point increase for one additional month — is the largest monthly move on any current Polymarket geopolitical contract. If you have a view on the pace of negotiations, this is the place to express it.

    Sports: NBA Finals Favorite Remains Open, World Cup Is a Three-Way Race

    NBA Finals futures on Polymarket give the San Antonio Spurs a 14.7% chance of the title at $19.9M volume — the highest-volume single futures contract of any sport on the platform. No team is above 20%, which is unusual this late in the regular season and reflects genuine market uncertainty about which conference finalist emerges. For the 2026 FIFA World Cup, France (16.1%), Spain (16.1%), and Portugal (7.8%) are the three liquid favorites; the market has yet to price anyone as a clear top choice.

    Where to Trade

    Disclosure: PredictWire earns a commission on qualifying accounts opened through the links below. Our rankings and reviews are not influenced by these relationships. Full disclosure.

    Every market cited above is live on Polymarket right now. For readers in the United States, Kalshi offers CFTC-regulated alternatives on the economic and political contracts (Fed, elections, macro). PredictWire’s current rankings of every major platform are available on our Best Prediction Markets page.


    About this article: Written and reviewed by The PredictWire Research Team under our Editorial Standards. Platform rankings follow our public Methodology. Prediction market contracts carry risk of total loss. Nothing here is financial advice. Corrections: corrections@predictwire.io.

  • Is Kalshi Legit? A Deep Dive Into the #1 US Prediction Market

    Yes — Kalshi is legitimate. It is the only federally regulated prediction market exchange available to US residents, operating as a Designated Contract Market (DCM) under the direct supervision of the Commodity Futures Trading Commission (CFTC). That status alone separates Kalshi from every grey-market or offshore competitor: the exchange is held to the same regulatory standard as CME Group, ICE, and other US derivatives venues. But “legit” is a bigger question than “licensed,” so this deep dive unpacks what Kalshi actually is, how it handles your money, where it shines, and where it still has room to grow.

    What Kalshi Is — and What It Isn’t

    Kalshi is a CFTC-regulated event contract exchange headquartered in New York. Traders buy and sell Yes/No contracts tied to real-world outcomes — Fed rate decisions, CPI prints, election results, sports championships, weather events, and more. Each contract settles at $1.00 if the event occurs and $0.00 if it doesn’t. The market price of a contract, between $0.01 and $0.99, functions as the crowd’s probability estimate.

    What Kalshi is not: it is not a sportsbook, not a crypto exchange, and not a grey-market offshore operator. It is a regulated derivatives marketplace. That distinction matters for taxes, consumer protections, and the legal footing your positions stand on.

    Is Kalshi Legal in the US?

    Short answer: yes, for adults 18 and older in all 50 states, subject to category-level rules. Kalshi received its DCM designation from the CFTC in 2020 and has defended — and won — multiple legal challenges, including the landmark 2024 ruling that affirmed its right to list congressional election contracts. As of April 2026, Kalshi offers:

    • Political markets, including presidential, Senate, House, and gubernatorial races
    • Economic markets tied to Fed rate decisions, CPI, unemployment, and GDP
    • Sports event contracts for major US leagues
    • Climate, weather, and cultural outcome markets

    Because Kalshi is federally regulated, individual state sports-betting laws don’t apply to its sports event contracts — a structural advantage competitors cannot replicate without a DCM license of their own.

    How Safe Is Your Money?

    Funds on Kalshi are held in segregated customer accounts at US banks, separated from the company’s operating capital. This is the same framework that protects futures traders at CME and ICE. Key protections include:

    • Segregated custody of customer funds under CFTC Part 1 rules
    • No credit risk to the exchange — Kalshi doesn’t trade against you
    • Anti-money-laundering (AML) and Know-Your-Customer (KYC) verification on every account
    • Published position limits to protect market integrity

    Deposits are made via ACH, wire, or debit card, and withdrawals are processed back to the originating bank account — no crypto, no opaque payment processors, no offshore intermediaries.

    Kalshi vs. the Alternatives

    The quickest way to evaluate Kalshi’s legitimacy is to compare it to the two main alternatives US traders consider: Polymarket and offshore sportsbooks.

    Feature Kalshi Polymarket Offshore Books
    US Regulation CFTC DCM Not licensed in US Unlicensed
    Legal for US Residents Yes Restricted No
    Funds Held In Segregated US bank accounts USDC on-chain Varies
    Deposit Method ACH, wire, debit card Crypto only Crypto / sketchy rails
    Consumer Recourse CFTC Limited None
    Tax Reporting 1099 provided Self-reported Self-reported

    For a fuller head-to-head, see our complete rankings of the best prediction markets.

    Fees, Liquidity, and UX

    Kalshi charges a per-contract trading fee that scales with price — tighter for contracts near $0.50 and cheaper at the extremes — plus a small settlement fee on winning contracts. In practice, total round-trip cost for a typical political or economic contract lands in the 1–3% range, competitive with Polymarket once on-chain gas and spread are factored in.

    Liquidity has grown sharply through 2025 and into 2026. Flagship markets — presidential and congressional elections, Fed rate decisions, NFL championship odds — routinely see seven- to eight-figure notional volume with sub-penny spreads. Deep markets mean tighter entries, cleaner exits, and more reliable crowd-sourced probabilities.

    The interface is clean by prediction-market standards: real-time order books, charting, mobile apps on iOS and Android, and an API for algorithmic traders. Customer support is US-based and responsive.

    Where Kalshi Falls Short

    No exchange is perfect, and Kalshi has real limitations worth naming:

    • Narrower long-tail coverage than Polymarket. Polymarket’s permissionless listing process means obscure geopolitical and cultural markets often appear there first.
    • Regulatory listing lag. New contract categories require CFTC self-certification or approval, which slows time-to-market.
    • Position limits on retail traders. The same rules that make Kalshi safe also cap how large individual positions can be.
    • No leverage or margin. You fund every contract fully in cash.

    None of these is a legitimacy issue — they’re tradeoffs inherent to running a regulated exchange.

    The Verdict: Yes, Kalshi Is Legit

    By every reasonable standard — regulatory status, fund safety, tax transparency, legal clarity, and operational track record — Kalshi is the most legitimate prediction market available to US residents in 2026. It’s not the only market you should use (Polymarket still wins for certain niche contracts and for non-US traders), but it is the safest starting point for anyone new to event contracts and the default venue for serious traders who want clean regulatory footing.

    Get Started

    Ready to trade? Open a Kalshi account and get started with event contracts in minutes: Sign up with Kalshi. Prefer to compare venues first, or want access to crypto-native markets? Check out Polymarket, or see our complete ranking of the best prediction markets in 2026.


    About this article: Written and reviewed by The PredictWire Research Team under our Editorial Standards. Platform rankings follow our public Methodology. Prediction market contracts carry risk of total loss. Nothing here is financial advice. Corrections: corrections@predictwire.io.

  • How to Make Money on Prediction Markets: Strategies That Work

    Making money on prediction markets is possible, but only for traders who treat it like any other edge-based market: with research, discipline, and a written plan. The short answer is that profitable prediction market traders do three things consistently — they find contracts where their estimated probability differs meaningfully from the market price, they size their positions to survive variance, and they exit when the edge disappears. Below we walk through the six strategies that actually work on Kalshi and Polymarket, the platforms we rank #1 and #2 on PredictWire’s best prediction markets list, plus the bankroll and psychology rules that separate winners from the crowd.

    Strategy 1: Edge-Based Directional Trading

    The foundation of every profitable prediction market strategy is the same: identify contracts where the market price misrepresents the true probability. If a Fed rate-cut contract is trading at 58% and your research — based on CPI prints, Fed speakers, and the SOFR curve — suggests the real probability is closer to 72%, you have a 14-point edge. Buying “YES” at $0.58 and holding to resolution at $1.00 yields a 72% return on capital if you are right.

    Successful directional traders build small models. They do not need to be statisticians. A spreadsheet that weights the three or four factors that historically drive an outcome is usually enough to spot mispricing on contracts with thin liquidity or where retail sentiment is one-sided.

    Strategy 2: Arbitrage Between Kalshi and Polymarket

    Because Kalshi (CFTC-regulated, USD-denominated) and Polymarket (on-chain, USDC-denominated) often list overlapping contracts — Fed decisions, election outcomes, Bitcoin price levels — the two venues regularly price the same event differently. When the YES price on one exchange plus the NO price on the other sums to less than $1.00, a risk-free arbitrage exists.

    In practice you rarely see clean 2–3 cent arbitrage for long, but 0.5–1.5 cent spreads appear frequently around major news. Sophisticated traders run scripts that poll both order books, and scale position sizes to fee structures.

    Strategy 3: Market-Making and Limit-Order Strategies

    Instead of crossing the spread, post it. On contracts with wide bid/ask gaps — common in political markets more than 30 days out, or in niche sports contracts — you can place limit orders on both sides and collect the spread when retail traders hit your quotes. This is the same strategy that generates most of Wall Street’s option market-making revenue, only available to retail at a much smaller scale.

    Market-making requires two things: capital that can sit idle for days, and the discipline to cancel quotes the moment real news breaks. The trader who forgets a stale quote into an unexpected announcement can be run over in minutes.

    Strategy 4: Event-Driven and Catalyst Trading

    Many prediction markets are driven by scheduled catalysts — CPI releases, Fed meetings, elections, Supreme Court decisions, sports playoffs. The edge in event-driven trading comes from being faster, better informed, or better positioned than the crowd going into the catalyst. This often means taking the opposite side of momentum traders who have bid a contract far past its real probability.

    A classic pattern: a contract rips from 40% to 65% in the 72 hours before a catalyst, driven by social media hype. Historical base rates suggest the true probability is still 45%. Fading the move — carefully and with tight sizing — has been one of the most reliable edges on Polymarket over the last 24 months.

    Strategy 5: Long-Tail and Neglected Markets

    The crowded markets — presidential elections, Super Bowl winners, Bitcoin year-end price — are the hardest to beat because everyone is watching. The real edge is usually in neglected contracts: obscure ballot initiatives, mid-tier sports, economic indicators that do not generate headlines. If you have domain expertise in a niche area, long-tail markets give you the largest information advantage.

    Strategy 6: Hedging Real-World Risk

    Not every prediction market trade is about directional profit. Many of the most sophisticated users — small business owners, farmers, freelancers — use contracts on recessions, rate decisions, and commodity outcomes to hedge income volatility. A contractor whose revenue depends on mortgage rates can lock in partial protection by buying “rate cut” contracts when his pipeline slows. The profit on the hedge offsets lost business if rates stay high.

    Bankroll, Sizing, and the Mistakes That Wipe Traders Out

    No edge survives bad sizing. The traders who blow up always share the same pattern: 30–50% of bankroll on a single “sure thing,” followed by a loss that they cannot recover from psychologically. Our rule of thumb, drawn from the same Kelly-criterion math used by professional sports bettors, looks like this:

    Edge vs. Market Max Position (% of Bankroll) Example
    1–3 points 1–2% Small directional lean
    4–8 points 3–5% Clear model-driven edge
    9–15 points 6–10% Strong, researched view
    15+ points 10–15% (cap) Rare conviction trade

    The other common killers are chasing losses, doubling down on losing positions, and trading markets you do not understand because they look “easy.” Every profitable trader we know keeps a written journal of every position, the thesis, and the exit trigger.

    Choosing the Right Platform

    Strategy selection depends on where you trade. Kalshi offers CFTC-regulated contracts, US-dollar settlement, and the deepest liquidity on economic and political markets — ideal for directional and event-driven trading. Polymarket offers on-chain USDC settlement, larger global coverage, and often looser pricing in long-tail contracts — ideal for arbitrage, market-making, and niche plays.

    • Best for beginners: Kalshi — lower minimums, US-regulated, simple UX.
    • Best for arbitrage: Polymarket paired with Kalshi — the two largest overlapping order books in the industry.
    • Best for niche markets: Polymarket — thousands of long-tail contracts where retail edge is highest.

    Start Trading the Right Way

    Prediction markets reward preparation. Pick one strategy from the list above, paper-trade it for a month, size conservatively, and keep a journal. Consistent small edges compound faster than most new traders expect.

    Ready to put a strategy to work? Open an account on our two top-ranked platforms:

    For a full side-by-side comparison of every major platform — fees, liquidity, available markets, and ratings — see our master Best Prediction Markets rankings, updated monthly by the PredictWire research team.


    About this article: Written and reviewed by The PredictWire Research Team under our Editorial Standards. Platform rankings follow our public Methodology. Prediction market contracts carry risk of total loss. Nothing here is financial advice. Corrections: corrections@predictwire.io.