The $1T thesis and the empty infrastructure seats

The growth math first, with sources. Combined Kalshi + Polymarket monthly volume went from under $5B (Sept 2025) to roughly high-$20-billions by May 2026 (Pew/The Block methodology; we discount third-party dashboards that double-count maker+taker fills). Kalshi raised at a $22B valuation in May 2026 with $263.5M of 2025 fee revenue; Polymarket is reported around a $15B valuation with ICE having deployed $1.6B of an up-to-$2B commitment; Robinhood traded 8.8 billion event contracts in Q1 2026 alone (8-K, Apr 28, 2026); DraftKings and FanDuel launched on CME rails in December 2025. Bernstein (Apr 14, 2026) and Eilers & Krejcik (Dec 2025) independently model ~$1T annual volume by 2030.

The platforms keep absorbing the layers closest to trading — Kalshi shipped crypto perpetual futures in early June 2026 and is building its own pro terminal (CNBC, Jun 4); Polymarket bought the unified-API startup Dome and sunset its public API within ten weeks. What platforms cannot credibly absorb is the layer that judges THEM: independent settlement-risk ratings, neutral benchmarks, scored third-party research, citable archives. Map the stock market's layers onto event markets and four seats are empty or barely contested as of June 2026: settlement-risk ratings (zero players), independent benchmarks (only first-party indices exist), research-grade archives (free, undocumented snapshots only), and characterization-depth tax tooling (one $29 throwaway tool and one generic crypto-suite integration).

The institutional demand side is already arriving: Clear Street became Kalshi's first institutional FCM (May 1, 2026), Tradeweb pipes Kalshi probabilities to 3,000+ institutional clients, Susquehanna runs a dedicated desk, and the Federal Reserve Board's own working paper (FEDS 2026-010) calls these markets a 'high-frequency, continuously updated, distributionally rich benchmark.' Institutions consume exactly what infrastructure firms sell: integrity scores, clean data, citable indices, scored research.

Brierly is the bet on those empty seats, led by the emptiest: RuleScore (settlement-risk ratings) on the foundation of the only coded dispute database, with the Uncertainty Index (benchmarks), the Desk (Brier-scored research), the Archive (point-in-time data), EventBasis (tax), and exchange advisory as the surrounding lines. One firm, one verification standard, every claim sourced and dated.

The bear cases are real and priced: an ~80%-likely post-catalyst volume crash at some point (the 2024 election produced −84%), SCOTUS jurisdiction risk (~25–30% adverse by mid-2027 per traded odds), and a likely final rule restricting prop-style sports markets (which would help compliance and ratings services). The infrastructure thesis is built to survive all three: tax revenue trails volume by a filing season, archives compound through crashes, and disputes — the ratings business's demand driver — increase under stress.