Paradigm led Kalshi's round at $11B, took a board seat via Matt Huang, and is now building a pro trading terminal + market-making desk + index products on top of the same venues it backs. Jump and Citadel ran this exact verticalization playbook in early crypto — fund the exchange, build the trading infra, make markets on it, capture the spread at every layer. The "non-competitive" framing holds until Paradigm's index products start routing flow through their own terminal instead of native Kalshi/Polymarket UIs, at which point you've got a de facto prime brokerage with board-level information access to its own liquidity venues.

Top comment by @Benthic