Friday, August 28, 2026, Fed Chair Kevin Warsh gave his first Jackson Hole speech as chairman, and Polymarket's September rate market repriced within the hour. As of 2026-08-28 19:00 UTC, "no change in Fed interest rates after the September 2026 meeting" trades 49c bid / 50c ask, down from roughly 69c the morning before; "increase interest rates by 25 bps" trades the same 49c/50c, up from about 30c. What was a clear favorite for a hold the day before is now a coin flip with a hike. Numbers below are from Gamma and the CLOB, fetched at that time.
01The speechHawkish on inflation, silent on the path
Warsh's address, delivered at 10am ET (14:00 UTC) at the Kansas City Fed's annual Jackson Hole Economic Symposium, was his first as chair, and markets treated it as the closest thing to forward guidance they were going to get. He didn't disappoint the hawks: "We must be confident that underlying inflation is moving to our objective, clearly and at sufficient speed. Otherwise, we have work to do," he said, adding that "it is the Fed's job to deliver stable prices." Headline PCE inflation is running 3.7% year-over-year, with core PCE at 3.3% - both well above the Fed's 2% target, and "work to do" read to traders as an opening for a hike, not a pause.
Warsh also declined to hand markets an explicit reaction function, warning of a "hall-of-mirrors problem" where forward guidance can blind a central bank to new data, and said he wants a "quieter" Fed where investors aren't "looking primarily to the Fed for their next trade." That combination - hawkish tone, no explicit rule - is exactly what a market like this exists to price: with no formula to plug numbers into, traders read the speech and moved the odds in bulk instead.
02The chartThe move traces to 14:00 UTC, not the whole morning
Both contracts sat flat through the entire pre-speech morning - "no change" pinned near 68.5-69.5c, "25 bps increase" near 28.5-30.5c - with no drift ahead of the 10am ET start. Ten minutes after the speech began, both started moving, "no change" sliding to a 46.5-47.5c floor by mid-afternoon and "25 bps increase" climbing to a 52.5c high over the same window, before both settled back toward 49-49.5c into the evening. That is not a market that had already priced the outcome and drifted into it; it is a market that moved because of what Warsh actually said, timed to the minute his remarks hit the wires. Wire reports converged on similar magnitude - Fed watchers pegged bond-market odds of a September hike at 55-56%, up from roughly a third the day before - but Polymarket's own contract prices show a bigger same-day swing on the specific "hold vs. hike" framing, and the intraday shape shows it happened in one clean move, not a grind.
03The whole ladder, not just one bracketA cut is now a rounding error
FED DECISION IN SEPTEMBER? PRICE 24H
50+ bps decrease 0.25c -0.10c
25 bps decrease 0.65c -0.50c
No change 49.5c -18.0c
25 bps increase 49.5c +19.0c
50+ bps increase 0.45c +0.10c
The real headline isn't that "hike" pulled even with "hold" - it's what happened to "cut." A 25-basis-point decrease was the favorite as recently as early August, after a soft July jobs report this blog covered on 2026-08-08. It now prices at 0.65c, down half a cent on the day alone, and every scenario outside a flat hold or a 25bp hike - a bigger cut, a bigger hike - prices under half a cent combined. Whatever chance the market gave a September ease has been erased; the only live argument left is hold versus hike.
04Reading the bookReal size on both sides of a coin flip
TOP OF BOOK, 2026-08-28 19:00 UTC
No change bid 49c x 65,820 ask 50c x 13,072
25 bps hike bid 49c x 14,292 ask 50c x 22,052
Both books carry real size at a 1c spread, not a thin market gapping on a headline: $2.05M traded on "no change" and $1.92M on "25 bps increase" in the past 24 hours, out of $7.13M across the whole event and $3.72M in total liquidity. Depth sits close to the touch on both sides rather than stacked heavily one way - the kind of book you'd expect when two outcomes are genuinely contested at even odds, three weeks before the FOMC actually meets, rather than one where a single large trader has already picked a side.
05Watching the next three weeksOne screen, five brackets, every reprice
The September 15-16 FOMC meeting is still three weeks out, and a market that can move 18-19 points on one speech can move again on the next data print or Fed appearance. In polymarket-tui, the event's outcome table lists all five brackets - both cuts, hold, and both hikes - with price and 24-hour change side by side, so a swing like today's shows up as two rows flipping color at once rather than five separate lookups.
$ uv tool install polymarket-tui
$ polymarket-tui
No account is needed to browse markets, books, and charts. The install page has Homebrew and one-liner options.