The event contract paying out on an October Fed increase climbed from 17 cents to as high as 22 cents on about $10,000 of buying, while LSEG put the odds near 19%. The divergence sits a day before September inflation data.
Treasury traders pared their bets on a Fed rate increase on Tuesday. A small group of event-contract buyers did the opposite.
Kalshi's contract that pays out if the Federal Reserve raises rates by a quarter point at its Oct. 27 to 28 meeting spent the early morning at 17 to 18 cents, and printed 17 cents a little after 9 a.m. Eastern. Then the buying arrived in two blocks.
Between 9:32 and 9:35 a.m., as the cash market opened, about 35,000 contracts traded at 18 cents with buyers taking the offer, including one print of nearly 30,000. Between 10:35 and 10:36 a.m., another 13,000 or so changed hands at 20 and 21 cents, including a single 10,000-contract order. The price peaked at 22 cents just before 11 a.m. and spent the afternoon between 20 and 21 cents. The last trade before 1:45 p.m. was at 20 cents.
Buyer-initiated trades through early afternoon totaled about 53,000 contracts, worth roughly $10,000 at those prices.
What the bond market said
Over the same hours, Treasuries rallied. The 10-year yield fell about 5 basis points in the morning to near 5.19% before paring the move. Fed funds pricing compiled by LSEG put the chance of an October increase at about 19%. Brent crude fell about 2% early in the session.
Fed Governor Christopher Waller said inflation expectations are "well anchored." Dan Ivascyn of PIMCO said the Fed is on hold now but would "probably go one more time this year."
How a small market moves
A contract that costs 20 cents and pays $1 if the Fed hikes implies a 20% probability, but only as far as the money behind it. About $10,000 of buying is small enough that a single trader, or one hedger, could account for most of Tuesday's rise. Fed funds futures, the main market for these bets, are far deeper.
That does not make the event contract wrong. At 20 cents it sits about where futures-based pricing does. The divergence is in the direction of travel during the session, not the level.
Market implications
One reading is that the buying reflects a view that Wednesday's inflation report could revive October hike odds. Headline inflation is expected to rise to about 3.6%, and a buyer at 18 cents collects about five and a half times the stake if the Fed acts.
A second reading is that the move says little about the outlook. The volume is tiny, futures pricing did not follow, and the contract ended the session close to where rates markets put the odds.
What to watch
Wednesday's 8:30 a.m. consumer-price report is the test. If the Kalshi contract and futures-based odds move together after the release, Tuesday's divergence was noise. If they split again, the event market is carrying a different view.