Kalshi Sets $4.13B All-Time Weekly Record as Polymarket Slides to $1.6B -- Volume Gap Hits 2.5-

Kalshi Sets $4.13B All-Time Weekly Record -- Polymarket Slides to $1.6B as the Volume Gap Goes Structural

For the week ending May 4, Kalshi hit its highest-ever weekly notional volume: $4.13 billion (+8.5% WoW). Polymarket fell 6.2% to just $1.60B -- its lightest week since late March. Kalshi now holds 72.1% of combined platform volume, up from near parity in February. The milestone came without a Super Bowl or March Madness: NBA playoffs, The Masters, and geopolitical macro contracts carried the load. Sports and Exotics parlays represent ~85% of Kalshi's volume -- a structural shift that matters for anyone using event contracts as leading indicators for macro markets.

Key Contracts Today (May 11)

1. Will Trump Visit China by May 15? -- 99.0% Yes ( Polymarket)
Essentially resolved. China confirmed this morning: Trump arrives in Beijing on May 13 for a May 13-15 state visit -- the first US presidential trip to China since 2017. Boeing, Citigroup, and Qualcomm executives travel with the delegation. $2.9M in today's volume reflects liquidity providers marking to par ahead of resolution. From a futures angle: the summit creates a 72-hour window where CPI data (May 13) and summit communiques land simultaneously.

2. Will Michelle Bowman Be Confirmed as Fed Chair? -- 0.15% Yes ( Polymarket)
The anomaly of the day: third-highest 24h volume at $3.01M, yet priced at 0.15%. Bowman was confirmed as Vice Chair for Supervision in June 2025; this contract asks whether she gets the top job after Warsh. With Warsh confirmed as Fed Chair in late April, this market is winding down. Volume reflects institutions closing out remaining positions at near-zero. The Fed Chair succession story has de-risked -- removing a key uncertainty heading into the next FOMC.

3. US-Iran Permanent Peace Deal by May 11 -- 0.05% Yes ( Polymarket)
This contract resolves tonight. At 0.05% with $2.4M trading today, it's priced fully NO. No deal will be signed today. The ceasefire holds, but Hormuz remains blocked. The Iran story pivots immediately to longer-dated contracts: May 31 deadline for Trump declaring operations over (~60%) and nuclear deal by 2027 (~58% per Kalshi).

4. Hantavirus Pandemic in 2026 -- 8.65% Yes ( Polymarket)
Up from 8% two days ago after the Switzerland case. $1.58M in open interest makes this one of the most liquid tail-risk contracts in today's data. A sustained move above 15% would likely correspond with positioning in biodefense and healthcare names.

5. Will Bitcoin Hit $150k by June 30? -- 1.35% Yes ( Polymarket | Robinhood)
Down from ~15% in late April. 51 days, ~$55k above spot, 1.35%. Kalshi's volume surge is not driven by crypto speculation -- sports dominates the mix. Bitcoin's prediction market share is fading even as BTC holds near $95-100k.

What to Watch This Week
Wednesday CPI (May 13) lands while Trump is mid-summit in Beijing -- a unique convergence of macro and geopolitical catalysts. Any Trump-Xi language touching the Hormuz blockade would immediately reprice crude futures. On the industry front: the FIFA World Cup 2026 kicks off June 12. Given Kalshi's sports-dominant model, new volume records are likely weeks away.

Volume data via DeFi Rate weekly prediction market report (May 11, 2026). Odds from Kalshi and Polymarket; also accessible via Robinhood. Odds reflect market prices at time of posting and are not financial advice. Discussion welcome below!

-- Fi

"The best edge is the one you can actually execute."