PolymarketPoliticsDevelopingUpdated 2m ago

Will Flávio Bolsonaro win the second round of the 2026 Brazilian presidential election by less than 4%?

As of Oct 12, 2026, 6:08 PM ET, Polymarket priced this market at 24.5% (down from 26.5% 24 hours earlier). It had $33.2K traded in the past 24 hours, $88.9K of order-book liquidity and a bid-ask spread of 1.0 pts. probcast.co rates the support behind this price as moderate.

Market probability
24.5%
−2 percentage points
over 24 hours26.5% → 24.5%

Thin market where small orders can move the price — today's move came from a small group of accounts.

Price historyPolymarket

Source: Polymarket price history

How credible was the move?

Methodology →

Move validity

Moderate

Consensus stability

Forming

Contract clarity

High

Can you trust this price?

Two different questions: how hard the price is to move, and whose trading set it.

Market capacity

How hard is it to move this price?

ThinTight spread

Order-book liquidity

$88.9K

Bid-ask spread

1.0 pts

24h volume

$33.2K

Total volume

$129.4K

It would take roughly $5.1K of buying to move the price up by ~5 pts.

Little money on the book — a modest order can move this price, so treat swings with care.

Who's trading

Whose opinion is this price?

A few accounts
34%of the traded money came from the single largest account

Accounts

106

Trades

200

over 3 days

Largest order

$3.2K

$10.6K traded across these 200 trades (last 3 days).

A small group of accounts did most of the trading — neither one whale nor a broad crowd.

Recent trade activity$10.6K traded

From the latest trade tape (most recent 200 prints) — a live activity sample, not a lifetime total.

What this market actually measures

The second round of the presidential election is scheduled to take place in Brazil on October 25, 2026. This market will resolve according to the margin of victory between the top two candidates in the second round of the next Brazil Presidential Election.

This summary shows the opening of the venue's official rules. ProbCast has not yet generated an independent plain-English interpretation for this contract — review the full rules before relying on it.

View full official resolution rules

The second round of the presidential election is scheduled to take place in Brazil on October 25, 2026. This market will resolve according to the margin of victory between the top two candidates in the second round of the next Brazil Presidential Election. For the purpose of this market, the “margin of victory” is defined as the absolute difference between the percentages of valid votes received by the first- and second-place candidates. Percentages of the valid votes received by each candidate will be determined by dividing the total number of valid votes each of the top two candidates receives by the sum of all valid votes cast in the election. If the reported value falls exactly between two brackets, then this market will resolve to the higher range bracket. If a candidate other than Flávio Bolsonaro or Luiz Inácio Lula da Silva receives the most valid votes in the second round, or if the top two candidates receive exactly the same number of valid votes, this market will resolve to "Other". This market will resolve based on the official vote count once the vote count has been made official. If a recount is initiated before the vote total has been made official, the market will remain open until the recount is completed and the vote is made official. If the result of this election isn't known definitively by June 30, 2027, 11:59 PM ET, the market will resolve to "Other". This market will resolve based on the result of the election, as indicated by a consensus of credible reporting. If there is ambiguity, this market will resolve based solely on the official results as reported by the Brazilian government, specifically the Superior Electoral Court (Tribunal Superior Eleitoral, TSE) (e.g., https://dadosabertos.tse.jus.br/).

What could move this market next?

  • The market's deadline arrivesOctober 25, 2026 at 11:59 PM ET

    The contract must resolve based on what has happened by this date.

Derived from the contract's own mechanics as of Oct 12, 6:11 PM ET. ProbCast does not list scheduled meetings, announcements, or data releases it cannot verify.

Advanced analysis (experimental)

Research signals — these models are still accumulating the history needed for full validation, and they can disagree with the headline read. Model confidence: low · expected error ±20 pts.

Reacting to newsLegacy movement classifier: watch

What's happening

medium classifier confidence
Reacting to news

The price is actively repricing on real volume. The number is still moving — don't treat the latest print as settled consensus yet.

  • Probability moved 3.0 pts in ≤6h on adequate liquidity
  • Flow one-directional across 106 participants (broad, not a single order)

Read the latest price with caution; conditions make it an unreliable summary right now.

More details — reliability score, dynamics, durability
Reliability score
27Low
Where the price path tends to go next1085 observed
  • Choppy / mean-reverting97%
  • Stable consensus2%

Short-term motion of the price line (~1h), distinct from the environment above — not a prediction of the final outcome.

DurabilityHigh· half-life ~5h
PredictabilityElevated irreducibility

Secondary read: leaning toward Thin market.

A read-only classification of the market environment — how much weight the current price deserves as a read of consensus. It describes conditions, never a trade.

Change (pts)1H0.06H+3.024H-2.07D-2.0

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