Rio de Janeiro Governor Election Winner

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Market context

Former Mayor Eduardo Paes has surged to dominate the Rio de Janeiro gubernatorial race, with polls placing him between 34% and 40% in tested scenarios, while his closest challenger, Douglas Ruas, trails significantly at 9% to 11% [1]. This 0% market probability for an alternative winner reflects a head-to-head matchup where Paes leads Ruas by 49% to 16%, a margin so wide that it mirrors the statistical ties seen in the national presidential race between Lula and Bolsonaro, where erosion of the opposing base now drives growth more than persuasion [1]. The current certainty is tempered only by the fact that 59% of voters still say their choice is not definitive, a historical pattern in Brazilian elections where late shifts occur but rarely overturn dominant frontrunners [1].

Traders must watch the Supreme Federal Court’s pending ruling on whether the succession will be indirect or direct, as three justices have already indicated support for an indirect election where only the Legislative Assembly votes [2]. The confirmation hearing for Solicitor General Jorge Messias before the Senate Constitution and Justice Committee on Wednesday represents a critical immediate catalyst, requiring 41 of 81 senators for confirmation and potentially reshaping the political alliances that will influence the October vote [1]. Additionally, President Lula’s formal decision on running for a fourth term, expected at the party convention in June, could alter the national political landscape and indirectly impact state-level dynamics, as his candidacy remains widely considered a certainty despite health concerns [4].

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page is a comparison snapshot: one live quote (Polymarket), four reference venues with their key attributes, and a single execution path — every trade button routes to Prediction Today, which mirrors the Polymarket order book directly.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

On Prediction Today, which mirrors the Polymarket order book at 0% fees. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

Is this market available outside the US?

Prediction Today is available in most jurisdictions where Polymarket isn't directly accessible. Polymarket itself is geo-blocked in the US/UK/EU. Always check local regulations.

What's the difference between YES and NO shares?

A YES share pays $1.00 if the event happens, $0 otherwise. A NO share pays $1.00 if the event doesn't happen. The market price between 0¢ and 100¢ is the implied probability.

What does it cost to trade on Prediction Today?

Zero. Prediction Today routes every order to the live Polymarket order book; the only cost is the Polygon network fee, typically under $0.01 per transaction.

How reliable are the quoted odds?

The YES/NO percentages are the live mid-prices of the Polymarket order book. On deep markets they move every few seconds; on thinner ones you'll see short plateaus.