Via ellisonbronze.com
CME and Polymarket both signal Fed rate hold, but at different confidence levels
Institutional futures traders and retail prediction market bettors agree on the likely outcome but disagree on just how certain it is
Two of the most-watched tools for gauging Federal Reserve policy expectations are telling roughly the same story right now, but they’re telling it at different volumes. CME’s FedWatch tool and Polymarket’s binary prediction contracts both point to the Fed holding rates steady at the September 15-16 FOMC meeting. The gap is in how confident each platform’s participants are about that outcome.
Where the numbers stand
The federal funds target range has sat at 3.50%-3.75% since at least the July 28-29 FOMC meeting. As of August 19-20, both CME and Polymarket showed strong odds that the Fed will leave that range untouched when policymakers meet again in September.
CME’s FedWatch tool calculates its probabilities from 30-day fed funds futures prices, instruments traded overwhelmingly by professional fixed-income desks at banks, hedge funds, and asset managers. Polymarket takes a different approach entirely: users buy and sell simple yes/no contracts on whether a specific rate outcome will occur.
Prediction market volumes for Fed events on Polymarket have reached tens to hundreds of millions of dollars across 2026 contracts, which sounds impressive until you compare it to the depth of the fed funds futures market.
Macro, rates, and crypto—what moved markets and what matters next.
Daily. Free. Join 34,000+ readers across crypto, finance, and policy.
Across five FOMC meetings analyzed in 2025 and 2026, CME-implied probabilities for no rate change have exceeded Polymarket’s figures in every single instance.
Why the gap exists
The interesting finding from academic research covering this period is that the gap narrows as FOMC meeting dates approach. Both platforms converge toward similar probabilities in the days before a decision, suggesting the divergence is more about the speed of information incorporation than a fundamental disagreement about outcomes.
What this means for positioning
The consistently higher CME confidence in rate stability also tells a story about how institutional money views the current environment. Persistent inflationary pressures have kept the Fed in a restrictive posture throughout 2026, and the big players appear to be betting that the central bank won’t blink, with their positioning suggesting confidence that the 3.50%-3.75% range has staying power, at least through the near-term meeting cycle.