Polymarket$2.32BOIOpen interest: sum of pool liquidity across all active markets, reported by the Polymarket API.
Kalshi$350.67MOIOpen interest: total contracts outstanding across all active markets, reported by the Kalshi API.
Limitless$18.48MOIOpen interest: estimated from total volume traded (USDC). Limitless does not report a separate OI metric.Compare 2026 Brazilian Presidential Election prediction market odds side by side across Polymarket, Kalshi. Platforms show similar odds, with an average spread of just 1.3pp. Close agreement often signals strong market consensus. With $407.7K in combined trading volume across 12 outcomes, this is one of the notable cross-platform prediction markets.
Ratinho JúniorKalshiPolymarketCost: 97¢ per pair → pays $1 at resolution. Gross spread 3.1pp before fees.
View all arbs| Outcome | Polymarket | Kalshi | Spread |
|---|---|---|---|
 Luiz Inácio Lula da Silva | 46%-1.0 | 48%±0 | 2.5pp spread |
 Flávio Bolsonaro | 40% |
43%-1.0 |
| 3.1pp spread |
Ratinho Júnior | 5%±0 | 2%-1.0 | 3.1pp spread |
 Renan Santos | 4%±0 | 2%±0 | 1.9pp spread |
 Fernando Haddad | 3%±0 | 2%±0 | 0.9pp spread |
 Jair Bolsonaro | 1%±0 | 3%+1.0 | 1.9pp spread |
 Tarcisio de Freitas | 1%+0.7 | 2%±0 | 1.1pp spread |
R Romeu Zema | - | 1%-1.0 | - |
R Ronaldo Caiado | - | 1%±0 | - |
A Aldo Rebelo | - | 1%±0 | - |
 Michelle Bolsonaro | 1%±0 | 1%±0 | 0.5pp spread |
 Eduardo Bolsonaro | 0%±0 | 1%±0 | 0.7pp spread |
