Fed Hike Odds Converge Near 80% After CPI, With Kalshi and Polymarket Aligned

Meta description: Kalshi, Polymarket and CME FedWatch all moved toward a September Fed hike after CPI, with the next FOMC decision due September 16.

Tags: Kalshi, Polymarket, CME FedWatch, Federal Reserve, FOMC, Kevin Warsh

Market platform: none-if-cross-platform

Category: Economics

Prediction markets and rates futures are now pointing to the same basic outcome for the Federal Reserve’s September 15-16 meeting: a quarter-point rate hike is the market’s dominant scenario. Kalshi’s September 11 market update put a 25-basis-point hike at 81%, Polymarket showed the outcome near 80%, and CME FedWatch was cited by major financial outlets near the mid-80s after the August CPI release.

The convergence matters because the September decision has become a test of whether traders believe Chair Kevin Warsh and the Federal Open Market Committee will respond to renewed inflation pressure or extend the hold that began after the Fed last set the federal funds target range at 3.50% to 3.75%. A rate cut is not priced as a live outcome across the main public market gauges.

What are Fed hike markets pricing before the September meeting?

Kalshi’s own September 11 news post said its September Fed market priced a 25-basis-point increase at 81% after the August CPI report, with the no-change outcome at 19%. Polymarket’s “Fed Decision in September?” market showed a 25-basis-point increase near 80%, with no change around 21% and cut outcomes below 1%.

CME FedWatch, the futures-implied benchmark most commonly cited by rates traders and financial media, also moved toward a hike after the CPI release. Barron’s reported market expectations at 85.8% after the data, while Axios and The Wall Street Journal described the market-implied probability as roughly 85% to 87%.

That leaves the three sources broadly aligned, not split. The small differences are normal for markets that use different instruments, fee structures, trader bases and settlement mechanics. CME FedWatch derives probabilities from federal funds futures. Kalshi and Polymarket quote event contracts whose prices can move with liquidity, order-book depth and platform-specific demand. The shared signal is still clear: traders entered the final weekend before the meeting pricing a hike as more likely than a hold.

Why did hike odds jump after the inflation data?

The August inflation data shifted the September meeting from a close call toward a likely hike in market pricing. The Bureau of Labor Statistics reported that the Producer Price Index for final demand rose 0.4% in August and 5.4% over the year, according to coverage of the September 10 release. The next day’s CPI report added pressure by showing stronger core inflation momentum than traders had expected.

MarketWatch reported that Polymarket’s probability for a September hike rose to about 81% after the August inflation report, up from 59% shortly before the release. Kalshi said its own September Fed market moved 20 points in a day to 81%. Those moves lined up with the post-CPI repricing in futures markets tracked through CME FedWatch.

The policy setup was already hawkish before the CPI report. At Jackson Hole on August 28, Warsh used a keynote titled “In Our Time” to emphasize that the Fed still needed confidence that inflation was moving toward its 2% PCE target at sufficient speed. That framing made the inflation reports immediately relevant for September pricing, because traders were watching whether the data would give the Committee enough reason to act after a string of holds.

What did the July FOMC vote signal?

The Federal Reserve’s July 29 minutes show that the Committee voted to leave the target range for the federal funds rate unchanged at 3.50% to 3.75%. The vote was 9-3, with Beth M. Hammack, Neel Kashkari and Lorie K. Logan dissenting because they preferred to raise the target range by 1/4 percentage point at that meeting.

That vote matters for September because it showed a visible hawkish minority before the latest inflation data arrived. A 9-3 hold is still a clear majority decision, but the three dissents gave traders a concrete sign that some policymakers already viewed another increase as appropriate. The question for September is whether the hotter inflation readings move additional voters toward that camp.

The September meeting is also a Summary of Economic Projections meeting, according to the Federal Reserve’s official 2026 FOMC calendar. That means the rate decision will be accompanied by updated projections and a press conference, giving markets more than a simple hike-or-hold result to digest.

Is the Fed in a blackout period now?

Yes. The St. Louis Fed’s published blackout calendar lists the blackout period for the September 15-16, 2026 FOMC meeting as Saturday, September 5 through Thursday, September 17. During that window, Federal Reserve policy limits public comments and interviews by FOMC participants and staff on monetary policy and economic conditions.

That timing puts more weight on the data and on market positioning. With policymakers constrained from publicly guiding expectations, traders have been left to price the meeting through CPI, PPI, Treasury yields, prior FOMC communications and the July vote record.

The rate decision is scheduled for 2:00 p.m. Eastern on Wednesday, September 16, with the post-meeting press conference at 2:30 p.m. A 25-basis-point hike would lift the target range to 3.75% to 4.00%. A hold would keep the range at 3.50% to 3.75% and would force traders to reassess whether the Committee is waiting for more evidence before restarting increases.

How does this fit the prediction-market industry’s broader week?

The Fed pricing move landed during a busy stretch for event-contract exchanges, as macro markets and sports contracts both drew attention. In rates, the September FOMC contract became one of the clearest examples of how prediction markets now compete with futures-derived tools as public barometers for policy expectations.

The comparison is especially important because Kalshi, Polymarket and CME are not identical products. Kalshi operates as a CFTC-regulated event-contract exchange. Polymarket’s public markets have become a widely watched crypto-linked venue for political, economic and cultural outcomes. CME FedWatch is not a prediction market platform in the same sense, but its futures-implied probabilities remain a central reference point for institutional rates coverage.

For readers tracking the industry, the September Fed decision is therefore both a macro event and a market-structure test. If the Fed hikes, the dominant contracts on Kalshi and Polymarket resolve with the futures-implied consensus. If the Fed holds, the minority position wins and traders will immediately reprice the October path.

What is the next decision after September?

The next scheduled FOMC meeting after September 15-16 is October 27-28, 2026, according to the Federal Reserve’s official 2026 meeting calendar. The following scheduled meeting is December 8-9. There is no scheduled November 4-5 FOMC meeting on the Fed’s 2026 calendar.

That makes October the next major monetary-policy milestone after the September decision. If the Fed raises rates on September 16, traders will turn to whether October brings another increase or a pause. If the Fed holds, October becomes the next immediate test of whether the inflation data merely delayed action or failed to persuade a majority of the Committee.

The first settlement point comes at 2:00 p.m. Eastern on September 16, when the Federal Reserve releases its statement. The next repricing point follows minutes later, when Warsh begins the press conference and markets get the first explanation of how the Committee weighed inflation, dissents and the path to the October 27-28 meeting.