An 81-Cent Favorite Lost, a 3-Cent Hike Drew Two Votes, and the Fine Print Paid

This week the contracts met their outcomes, and each one tested what a price is.

Brazil's favorite traded near 81 cents on Sunday afternoon and lost by nightfall. The Fed's hold traded near 97 cents and came with two dissents. An Iran contract fell 28 points on a news report and recovered by morning. A contract on Lagarde leaving the ECB in 2026 paid Yes, though she leaves in 2027.

None of those prices was a forecast of certainty.

Each was a probability under a rule.

Here are the six that explain the week.

Four in Five Is Not Five in Five.

CONTRACT: Polymarket's contract on a Flávio Bolsonaro win in Brazil, alongside Kalshi's version.

START-OF-WEEK PRICE: Polymarket near 81 cents at 1:47 p.m. Sunday. Kalshi near 82 cents.

END-OF-WEEK PRICE: Both settled No. Kalshi settled at about 9:09 p.m. ET Sunday, and Polymarket's showed No by early Monday.

CATALYST: President Lula won the runoff with 51.79% of valid votes, the electoral court said. Polymarket's price slid after a court order extended voting by two hours.

RESOLUTION CONDITION: Polymarket pays on the winner, based on a consensus of credible reporting. Kalshi's market closes once a winner is announced. It settled before Bolsonaro said he would seek an annulment, a plan he later dropped.

WHAT THE MARKET ACTUALLY SAID: The final polls had the race within the margin of error. An 81-cent price still left about a one-in-five chance, and that outcome arrived. The same bet ran through Brazil's assets. The Ibovespa fell as much as 17%, and the Treasury bought back about R$14.8 billion of bonds. The contract defined its loss. The market for Brazil did not.

The Price Got the Hold. It Missed the Dissents.

CONTRACT: Kalshi's October rate-hike contract, alongside its December counterpart.

START-OF-WEEK PRICE: October near 6 cents. December near 79 cents before Wednesday's decision.

END-OF-WEEK PRICE: October last traded at 3 cents, a minute before it closed at 1:59 p.m. Wednesday. December near 73 cents Friday.

CATALYST: October rose to 9 cents Monday with no identified cause. Traders bought about 140,000 contracts at 7 cents in ten minutes Tuesday, and the price held. The Fed then held in a 10-2 vote, as Warsh called inflation "too high."

RESOLUTION CONDITION: October pays only on a quarter-point hike at the Oct. 28 decision. December pays only on a quarter-point hike at the December meeting.

WHAT THE MARKET ACTUALLY SAID: Traders priced a hike at 3 cents, and two of the 12 voters wanted one. The contract prices the decision, not the vote count. December rose to 81 cents after the meeting, then slipped as bond traders bought Treasuries as if rates will fall. The 10-year fell to about 4.93%. The two markets now lean in different directions.

The Drop Came Before the Claim.

CONTRACT: Polymarket's Iran ceasefire ladder, Oct. 31, Nov. 8 and Nov. 15 expiries.

START-OF-WEEK PRICE: Oct. 31 near 84.5 cents Sunday afternoon. Nov. 8 near 70 cents and Nov. 15 near 55.5 cents Tuesday morning.

END-OF-WEEK PRICE: Oct. 31 near 91 cents early Friday. Nov. 8 near 74.5 cents. Nov. 15 near 58.5 cents Thursday morning.

CATALYST: On Sunday, the Oct. 31 contract slid to 69 cents between about 5:40 and 6 p.m. A strike claim was relayed only after 6 p.m., as it recovered. On Thursday, it fell from about 96 cents to 68 after a Wall Street Journal report on strike options briefed to President Trump.

RESOLUTION CONDITION: Each contract turns No only on a qualifying U.S. strike on Iranian territory. Reports, briefings and letters do not count.

WHAT THE MARKET ACTUALLY SAID: Both drops reversed within hours, and Thursday's low came in a thin evening book. The ladder kept one shape all week. Its steepest step falls between Oct. 31 and Nov. 8, across the Nov. 3 midterms. That is the line Trump drew on Oct. 8. Oil producers are already paid for the risk. Exxon Mobil (XOM) and Chevron (CVX) touched record highs as refining profits surged.

One Race, Two Questions.

CONTRACT: Polymarket's and Kalshi's contracts on Israel's next prime minister.

START-OF-WEEK PRICE: On Polymarket before polls closed Tuesday, Gadi Eisenkot near 63 cents and Benjamin Netanyahu near 23 cents.

END-OF-WEEK PRICE: Polymarket had Netanyahu near 40.5 cents and Eisenkot near 33 cents early Friday. Kalshi had Eisenkot at 17 cents and Netanyahu near 22 cents.

CATALYST: The count ended with no bloc near 61 seats. Netanyahu's bloc has 53, the opposition 48 and Arab parties 19.

RESOLUTION CONDITION: Kalshi asks who becomes prime minister following this election. Polymarket's contract carries over to a repeat election.

WHAT THE MARKET ACTUALLY SAID: The same count produced two prices, because the venues ask two questions. A stalemate that forces a new vote could pay differently on each. Polymarket is also examining pre-close bets on Netanyahu, after Bloomberg found more than 600 new wallets. Bloomberg called its analysis far from conclusive. Israel's main ETF fell about 5% as the count came in.

Paid on the Fine Print.

CONTRACT: Polymarket's Oct. 22 Iran ceasefire contract, and its contract on Christine Lagarde leaving the ECB in 2026.

START-OF-WEEK PRICE: The Iran contract near 98 cents with a "disputed" status. The Lagarde contract open ahead of Thursday's ECB meeting.

END-OF-WEEK PRICE: Both paid Yes.

CATALYST: The Iran contract settled late Sunday after 13 status changes, about three days past its deadline. The ECB held at 2.5% Thursday, and Lagarde will leave in February.

RESOLUTION CONDITION: The Iran contract turns No only on a qualifying U.S. strike on Iranian territory. The Lagarde contract counts an announcement, not a departure.

WHAT THE MARKET ACTUALLY SAID: Lagarde leaves on Feb. 7, 2027. A contract on her leaving in 2026 closed at 100 cents anyway, because the rule pays on the announcement. The Iran contract waited days to pay a result its price had implied all along. A price is not a ruling. The rule, and the process behind it, decide the payout.

Both Venues Moved. No Headline Did.

CONTRACT: Polymarket's and Kalshi's contracts on Democratic control of the Senate.

START-OF-WEEK PRICE: Polymarket near 68.5 cents and Kalshi near 67 cents before Friday's move.

END-OF-WEEK PRICE: Polymarket near 72.5 cents and Kalshi near 71 cents Friday.

CATALYST: No single piece of news lines up with the timing. One 50,000-contract purchase on Kalshi came at 12:19 p.m. ET.

RESOLUTION CONDITION: Each pays on Democratic control of the Senate. The vote is Tuesday, Nov. 3.

WHAT THE MARKET ACTUALLY SAID: Two venues moved the same 4 cents on deep books, which makes the move harder to dismiss. It still says about seven in ten, not a result. The venues themselves have more riding on the vote.Robinhood (HOOD) now earns more from event contracts than from crypto.

A favorite lost, a hold came with dissents, and a 2026 contract paid on a 2027 exit. The Iran ladder swung on reports it does not count. Israel's count set two prices for one race.

Each price was a probability.

The rule decided what it paid.

Capital moves early. Coverage catches up. The gap between the two is worth watching.