Polymarket Hot Markets — May 26, 2026
Big Picture
Polymarket continues to dominate prediction market volume with over $3B in active markets as of May 2026. Geopolitical tensions — particularly the US-Iran peace process — are driving extraordinary liquidity, while 2028 US election markets have already attracted over $2.2B in combined volume. Sports markets (NBA Finals, FIFA World Cup) and AI/tech IPO markets round out a diverse landscape of high-stakes forecasting.
Top Developments
1. US-Iran Permanent Peace Deal — 81% Probability, $186M Volume The single highest-confidence political market on the platform. Traders assign 81% probability to a permanent US-Iran peace deal by December 31, 2026, with $186M in volume and $2M in liquidity. An interim ceasefire extension market (June 30) sits at 78%.
2. 2028 US Presidential Election — $2.2B+ Combined Volume Republican Nominee market: J.D. Vance leads at 34%, followed by Marco Rubio (24%). Democratic Nominee market: Gavin Newsom leads at 24%, followed by AOC (9%). The Presidential Winner 2028 market shows JD Vance at 18% — the highest among all candidates despite never having held national office.
3. NBA Finals — Oklahoma City Thunder at 46%, $399M Volume The Thunder lead the Knicks (29%) and Spurs (25%) in a tight three-horse race for the 2026 NBA Championship. The Spurs-Thunder series market shows Thunder at 63% probability.
4. Fed Holds Steady — 97% Probability for June, $43M Volume Traders overwhelmingly expect no rate change at the June Fed meeting. Oil markets show WTI crude likely to stay below $85 (70% probability) through May.
5. OpenAI IPO by Year-End 2026 — 70% Probability, $2M Volume AI company valuations are priced for explosive growth: OpenAI hitting $900B by year-end is 92% probable, Anthropic hitting $1T is 99% probable.
Market Snapshot by Category
| Category | Top Market | Probability | Volume |
|---|---|---|---|
| Geopolitics | US-Iran permanent peace deal (Dec 31, 2026) | 81% | $186M |
| US Elections 2028 | Democratic Presidential Nominee (Newsom) | 24% | $1B |
| NBA 2026 | Oklahoma City Thunder Champion | 46% | $399M |
| FIFA World Cup 2026 | France Winner | 18% | $1B |
| F1 2026 | Kimi Antonelli Drivers' Champion | 55% | $159M |
| Fed Policy | No change in June | 97% | $43M |
| Crypto | Bitcoin hit $150k by Dec 31, 2026 | 10% | $18M |
| AI/Tech IPOs | OpenAI IPO by Dec 31, 2026 | 70% | $2M |
Notable Highlights
- Iran Ceasefire Confidence: The current ceasefire is expected to hold through the May 24 deadline at 97% — one of the highest-confidence markets on the board.
- Texas Senate Primary: Ken Paxton is a 96% favorite to win the Texas Republican Senate primary.
- Bitcoin 5-Minute Game: Live up/down market on BTC is seeing ~$22M volume, with BTC currently around $76,584 — near even odds.
- SpaceX IPO: Market prices in a 97% probability of SpaceX closing above $1.2T market cap post-IPO.
- Colombia & Brazil: Each drawing $34-35M in 24-hour volume — hot geopolitical topics on the platform.
Technical Metrics
| Metric | Value |
|---|---|
| Platform Accuracy (1 month out) | >90% |
| Platform Accuracy (within 4 hours) | >96% |
| Brier Score (lower = better) | 0.0843 |
| Total Active Markets | Thousands |
| Volume (2025 Jan–Nov) | $22B+ |
Looking Ahead
The US-Iran peace deal market remains the most consequential to watch — a breakdown in negotiations would likely trigger major cascading shifts across oil, crypto, and geopolitical markets. The 2028 election cycle is already the largest pre-election prediction market event in history, dwarfing prior cycles. AI company IPO and valuation markets will be critical barometers for the tech sector through year-end 2026.
Source: Polymarket.com | Data as of May 26, 2026