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

Polymarket Update: Top Contracts to Watch This Week (September 25, 2026)

Polymarket’s most-liquid contracts closed the week with sharp moves across politics, macro, and crypto markets, reflecting how quickly on-chain traders are digesting the last two weeks of Fed signaling, campaign polling shifts, and a choppy Bitcoin tape. Below is our authoritative weekly breakdown of the highest-volume Polymarket contracts, where the smart money is positioned, and which pricing looks stretched heading into next week.

Political Markets: 2026 Senate Control Tightens

The headline mover on Polymarket this week is the “Which party will control the Senate after 2026?” contract. Democrats are trading at roughly 41% to hold the Senate, up from 34% two weeks ago, on the back of stronger polling in Pennsylvania and Ohio. Republicans sit at 58%, with a residual 1% priced across independent-caucus scenarios.

The 2026 House control market has moved the opposite direction. Republicans are 63% to retain the majority (up from 57% last week), while Democrats have slid to 36%. The divergence between the two chambers reflects redistricting realities that Polymarket traders have been slow to price in but are now catching up to.

Governor race markets remain the most inefficient corner of the political book. Multiple state-level contracts still show more than 5% arbitrage against consensus polling, particularly in Arizona and Michigan, where thin liquidity has kept prices anchored to stale news.

Fed and Macro: 50 bps Cut Odds Fade

The “Fed rate decision at the October 2026 meeting” market has repriced meaningfully since last week. A 25 bps cut now trades at 71%, a 50 bps cut has dropped from 22% to 14%, and no change has climbed to 15% following Chair Powell’s cautious remarks and this week’s PPI print. Traders who leaned into the 50 bps thesis after August payrolls have quietly exited.

The recession-by-year-end-2026 contract sits at 21%, essentially flat on the week but well below the 34% high set in June. The “Core CPI above 3% in September print” market resolved YES at 12:30 ET Wednesday, paying out longs who correctly read the shelter-services stickiness in the August data.

Crypto Contracts: Bitcoin $150k Bet Loses Steam

Bitcoin volatility is finally showing up in Polymarket’s crypto book. The “Will BTC hit $150,000 in 2026?” market has slid to 28%, down from a September high of 41%, after this week’s rejection at $128k and heavy futures liquidations. Traders rolled significant size into the more conservative “BTC above $130,000 by year-end” contract, now priced at 47%.

Ethereum contracts remain quieter. “ETH above $5,000 by December 31, 2026” trades at 33%, unchanged on the week, with most of the flow concentrated in shorter-dated tenors. The Solana ecosystem markets, particularly “Will Solana flip Ethereum by market cap in 2026?”, remain a low-probability lottery ticket at 4%.

Sports and Cultural Markets

NFL Super Bowl LXI futures on Polymarket are quietly some of the sharpest markets on the platform. The Kansas City Chiefs sit at 18%, Baltimore Ravens at 13%, San Francisco 49ers at 11%, Philadelphia Eagles at 10%, and Buffalo Bills at 9%. The remaining 39% is distributed across the rest of the field, with a heavy long tail on the Detroit Lions (7%) and Green Bay Packers (5%).

In cultural markets, “Will an AI model pass a peer-reviewed Turing test in 2026?” has climbed to 22%, driven by fresh interest in agentic benchmarks. The “Will OpenAI IPO before 2027?” contract remains stuck at 8%, unmoved by any concrete signal.

Where the Value Is

Three contracts stand out to us as mispriced heading into next week. First, the Senate market’s Democrat leg at 41% still looks cheap versus generic ballot polling and incumbent advantages. Second, the “Fed cuts by 50 bps at October meeting” contract at 14% is priced roughly in line with rates markets after the recent repricing, but Polymarket’s implied vol on the meeting outcome remains too low. Third, the Solana flippening market at 4% is a fair tail hedge for anyone long ETH into year-end.

Where to Trade

Ready to take a position on these contracts? Polymarket remains the deepest liquidity venue for political, macro, and crypto prediction markets globally, while Kalshi is the regulated CFTC-designated venue for US-based traders looking for event contracts on economics, elections, and finance.

We publish this Polymarket update every week. Bookmark PredictWire for the sharpest read on where the smart money is trading.