Fed hike odds near 90% ahead of CLARITY's Senate test

Washington gives crypto two deadlines

A rate cut would be a surprise this week. When Spectre captured prediction-market quotes at 10:15 UTC on September 15, traders put the September Fed decision firmly on the hike side: the midpoint for a quarter-point increase was 88.5% on Polymarket and 87.5% on Kalshi. The Federal Reserve's meeting runs September 15 and 16. [1, 2, 3, 4]

Crypto also faces a Senate test over the CLARITY Act. The immediate question is whether lawmakers advance consideration of the bill. The year-end prediction markets ask a much larger question: whether legislation completes the process and becomes law. A headline about progress can move prices well before that final hurdle is cleared. [5, 6, 7]

I'm watching these events separately. Monetary policy affects the terms on which investors take risk. Crypto legislation affects the rules under which businesses can operate. Progress on one can arrive alongside disappointment on the other.

The prices behind the headline

These are frozen observations from public venue APIs, retrieved between 10:15:00 and 10:15:23 UTC on September 15, 2026. We calculate an indicative midpoint from the best YES bid and ask when both sides are present and positive. The spread remains visible because the midpoint is not a price at which a reader can necessarily trade. [1]

September quarter-point hike: Polymarket 88-89 cents, midpoint 88.5%; Kalshi 87-88 cents, midpoint 87.5%.
September hold: Polymarket 10-11 cents, midpoint 10.5%; Kalshi 12-13 cents, midpoint 12.5%.
September quarter-point cut: Polymarket 0.1-0.2 cents, midpoint 0.15%. Kalshi returned a zero bid and a one-cent ask, so we do not assign it a midpoint probability.
H.R.3633 enacted by Polymarket's year-end deadline: 17-18 cents, midpoint 17.5%. Kalshi's broader crypto market-structure law contract before January 1, 2027: 18-20 cents, midpoint 19%. These are different contracts.

What a likely hike leaves unresolved

The Fed held its target range at 3.50%-3.75% on July 29. Three members preferred a quarter-point increase, and the statement said inflation remained above the 2% goal. That gives the hike discussion some official context. September's meeting also includes economic projections. [4, 8]

A high-priced hike contract still leaves room for a large market reaction. The decision could match expectations while the statement or projected rate path changes investors' view of the following meetings. Conversely, a hold would differ sharply from this snapshot, but the reason for holding would matter: signs of improving inflation and concerns about weakening demand would carry different implications for equities and crypto.

Higher rates can raise financing costs and make interest-bearing assets more competitive with speculative holdings. Crypto prices also respond to positioning, flows and asset-specific news. These contracts do not tell us how much Bitcoin will move, or even establish the direction of its next move. Our interpretation is that the explanation accompanying the decision deserves as much attention as the rate itself.

CLARITY's next vote is a procedural step

Senator Cynthia Lummis's office released a final draft on September 14 and said it would be offered as a substitute amendment if the Senate invokes cloture on the motion to proceed on Tuesday afternoon. That describes a step toward consideration. It does not announce Senate passage or enactment. The release is from the bill's sponsors, so its claims about the strength of the agreement should be read as their position. [5]

Opposition remains visible. In a September 14 statement, Senator Elizabeth Warren argued that the proposed safeguards would leave presidential crypto conflicts unresolved. Her objection and the sponsors' account of their agreement show why the vote itself carries more information than either side's description of the deal. [9]

This distinction changes how to read the odds. A successful procedural vote could improve the bill's prospects while leaving disagreements over the text and subsequent votes unresolved. An unsuccessful vote could make the remaining calendar more difficult without establishing that every possible legislative route has ended.

For businesses, the eventual text matters alongside the timetable. The sponsors describe changes concerning ethics, stablecoin-related deposit flight and protections for developers. Those provisions can affect different parts of the industry differently. A broad label such as 'pro-crypto bill' is too vague to explain which business model benefits or what compliance work it would face. [5]

Why the CLARITY percentages cannot be averaged

Polymarket's contract specifies the Digital Asset Market Clarity Act of 2025, H.R.3633, passed by both chambers and signed into law by December 31, 2026 at 11:59 p.m. Eastern. Kalshi's contract accepts a qualifying crypto market-structure bill before January 1, 2027. Its rules require a broad framework, a division of federal regulatory authority and asset classifications; stablecoin-only legislation and executive orders do not qualify. [6, 7]

That leaves a possible outcome in which a different qualifying bill succeeds and the two contracts resolve differently. The 1.5-percentage-point gap between their midpoints therefore cannot be treated as a clean disagreement about H.R.3633. Differences in contract wording, spreads and observation times all matter. Neither quote measures the probability of Tuesday's procedural vote by itself.

There is a similar limit on reading the Fed prices. Quotes on separate outcomes can add to more or less than 100%, and a one-cent offer with no positive bid is weak evidence of a precise one-percent probability. We preserve the source prices instead of forcing them into a neat distribution.

What I will watch after the headlines

If the Fed delivers the expected hike, I would compare the statement and projections with the next-meeting contracts before attributing a crypto move to rates alone. If it holds, the first task is to establish why. On CLARITY, I would check the actual vote question and result, then whether the substitute text advances. Each new fact should update the relevant expectation.

A useful follow-up will show how the same contracts repriced after those events, with bid and ask, timestamps and unchanged settlement rules. Comparing today's H.R.3633 contract with tomorrow's broader legislation market would obscure the change we are trying to measure. The frozen snapshot below gives this article a reproducible starting point.

How we checked the odds

The evidence file records contract identifiers, source URLs, retrieval times and price fields for all five Fed outcomes on each venue, plus the two legislation contracts. Venue record-update fields are retained but are not assumed to be timestamps of the latest executable quote. The observations are close in time, not synchronized. [1]

We did not use search snippets as live prices or infer a historical trend from one snapshot. Prices reflect the contracts traded on these venues and can change after publication; they are not objective probabilities, an investment recommendation or a forecast of crypto returns. Analysis and scenario interpretation in this article are Alter's, separate from the sourced facts.

Sources

See a discrepancy? Send the article URL and supporting evidence to spectre@spectreai.io.

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