Total Active Markets

Count of all non-resolved markets currently tracked across Polymarket, Kalshi, and Limitless.

127,377

Total Volume

Lifetime trading volume across all platforms. Polymarket and Kalshi report volume directly; Limitless volume is cumulative USDC traded.

$5,730,792,477

24h Volume

24-hour trading volume. Polymarket and Kalshi report this directly. Limitless does not break out 24h volume separately, so it is not included.

$561,247,558

Total Open Interest

Polymarket: sum of pool liquidity. Kalshi: open interest (contracts outstanding). Limitless: uses total volume as a proxy — no separate OI metric is available.

$3,243,297,991

Polymarket$2.87BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.

Kalshi$354.88MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.

Limitless$23.03MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.

Total Active Markets

Count of all non-resolved markets currently tracked across Polymarket, Kalshi, and Limitless.

127,377

Total Volume

Lifetime trading volume across all platforms. Polymarket and Kalshi report volume directly; Limitless volume is cumulative USDC traded.

$5,730,792,477

24h Volume

24-hour trading volume. Polymarket and Kalshi report this directly. Limitless does not break out 24h volume separately, so it is not included.

$561,247,558

Total Open Interest

Polymarket: sum of pool liquidity. Kalshi: open interest (contracts outstanding). Limitless: uses total volume as a proxy — no separate OI metric is available.

$3,243,297,991

Polymarket$2.87BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.

Kalshi$354.88MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.

Limitless$23.03MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.

polymarket🏛️ politics|2 outcomes

CA-21 House Election Winner

Updated Today

Volume:$16,769

Resolves:Nov 3, 2026

Trade on Polymarket

All Outcomes

Leading

Democratic Party

89.0%

Trade

Republican Party

10.5%

Trade

Trade on Polymarket

Frequently Asked Questions

What are the current odds for CA-21 House Election Winner?

As of March 18, 2026, the Polymarket odds for CA-21 House Election Winner are: Democratic Party: 89%, Republican Party: 11%. These probabilities are derived from real-money trading and update in real time.

Where can I bet on CA-21 House Election Winner?

CA-21 House Election Winner is currently available on Polymarket. Check PredictMarketCap for cross-platform availability as new markets are added regularly.

How are CA-21 House Election Winner prediction market odds calculated?

Prediction market odds reflect the aggregate opinion of traders who risk real money on outcomes. The price of a share (e.g., 65¢) represents the market's implied probability (65%). Prices move as traders buy and sell based on new information, polls, and analysis.