US House Election Odds

House markets split into two very different animals. Chamber control is one liquid contract that trades all day on national news. District markets are 435 potential contracts, of which platforms list the competitive slice, usually labelled by district code - TX-15, CA-22 and so on. This page carries both, priced across every platform quoting them.

Control is the market to watch for the national picture. Because the House is elected in full every two years, its control contract responds to the same signals as the generic ballot - presidential approval, economic prints, redistricting rulings - and the two should move together. When the generic ballot implies a comfortable popular-vote margin but the control contract does not follow, the market is expressing a view about how efficiently that margin converts to seats. Both contracts sit on this board, so the disagreement is legible rather than theoretical.

District contracts behave nothing like that. A single district is a small electorate with sparse polling and a handful of traders, so prices move in steps rather than smoothly and can sit stale for hours after a candidate filing, a retirement or a court-ordered map change. That thinness cuts both ways: it is the reason district prices are the least reliable numbers on the board, and the reason they are the most frequently mispriced relative to another platform quoting the same seat.

Redistricting is the House-specific risk with no analogue in Senate or governor markets. A map redrawn mid-cycle can invalidate the premise of a district contract entirely, and platforms handle that differently in their rules. Before trading a district contract, read how the venue defines settlement if the district itself changes.