SimpleFunctions
4 contractsKalshirefreshed 2 min agoCloses Jan 20, 2029 · 987d

Will John Roberts resign during Trump's term

Liquidity-weighted aggregate sits at 31% across 4 Kalshi contracts.

Implied probability

31%
0%50%100%

Kalshi

31%

4 contracts

Polymarket

not bound

Cross-venue gap

single venue

24h move

no pin

24h volume

$406

4 contracts

Closes

Jan 20, 2029

987 days

30-day trend

0%50%100%-30d-3w-2w-1wtodayAggregate: 59% (27 days, 27 points)Aggregate: 59% on 2026-05-08
Aggregate of 4 contracts · 27d

Bracket families

4 clusters across 4 contracts.

These contracts were grouped by title similarity. The headline aggregate combines all clusters; verify the cluster you actually need before quoting a number.

Cluster 1

Will Samuel Alito resign during Trump's term

1 contract$406

Cluster 2

Will Sonia Sotomayor resign during Trump's term

1 contract$0

Cluster 3

Will Clarence Thomas resign during Trump's term

1 contract$0

Cluster 4

Will John Roberts resign during Trump's term

1 contract$0

Analysis

This probability indicates a roughly one-in-three chance that Chief Justice John Roberts will resign from the Supreme Court during Donald Trump's current presidency, which runs through January 2029. The 32% level reflects uncertainty about whether health concerns, institutional pressures, or other personal factors might prompt his departure. The main drivers are Roberts' age (currently 69) and health trajectory, along with broader political dynamics that could influence his decision calculus. A key catalyst would be any public announcement regarding his health status or retirement plans, which would immediately resolve much of the current uncertainty. The contract data shown primarily tracks Trump-related events rather than Roberts-specific developments, suggesting limited direct market activity specifically on his resignation decision.

  • Roberts' current age and publicly disclosed health status would be direct indicators of resignation likelihood
  • Any announcement from the Supreme Court or Roberts' chambers regarding retirement plans would immediately clarify the question
  • Historical Supreme Court retirement patterns show few justices serve past their mid-80s, making timeline and health trajectory material factors
  • Trump administration policies affecting the Court's jurisdiction or legitimacy could influence Roberts' calculations about staying versus leaving
  • Media reporting on Roberts' behind-the-scenes views on Court dynamics or institutional concerns would provide evidence of his decision-making

What moved the line

  • May 2Samuel Alito4pp5761¢ · Kalshi
  • May 7Samuel Alito3pp6259¢ · Kalshi

Recently closed in trump

These markets stopped trading. Last odds and any captured outcome are shown above — full settlement detail lives at the venue.

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How we compute these odds

SimpleFunctions aggregates live prediction-market contracts from Kalshi and Polymarket. Each slug groups contracts that resolve on the same underlying event, identified by venue event_id.

For binary slugs, the headline probability is the liquidity-weighted mid-price across all bound contracts. For multi-outcome slugs (e.g. elections with 3+ candidates), the headline is the leader’s price; we never arithmetically average disjoint outcomes — that would produce a number with no real-world meaning.

Snapshots refresh every 5 minutes during market hours; daily aggregates are computed at 04:00 UTC. The 30-day sparkline is drawn from per-ticker daily means stored in market_indicator_daily; 24h delta and movement events are derived from the same source.

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