Wall Street has spent weeks debating whether the Federal Reserve will raise interest rates Wednesday.

The futures market has almost stopped debating.

Traders assign a 93% probability to a quarter-point hike, which would lift the federal funds rate to 3.75%–4.00%. It would be the Fed's first increase since July 2023.

On prediction market Polymarket, where $164 million has changed hands on the question, a 25-basis-point hike trades at 88 cents on the dollar. Three weeks ago, right after Chair Kevin Warsh spoke at Jackson Hole, that same contract was a coin flip at 49%.

That makes the hike itself less likely to surprise investors.

The bigger question comes one minute later: Is this a single adjustment, or the start of a new tightening cycle?

The answer will come from three places.

1. How Many More Hikes Appear In The Dot Plot?

September is one of four meetings a year that come with a Summary of Economic Projections — the Fed's own forecasts for growth, unemployment, inflation, and interest rates — plus the dot plot, a chart in which each policymaker marks where they think the benchmark rate should end each year.

In June, the median official expected rates to reach 3.75%–4.00% by December. A quarter-point increase Wednesday would complete that forecast.

If the new dot plot shows rates rising again before year-end, the message changes. September would no longer look like an isolated move. It would become the opening hike of a broader campaign.

"Barring a surprisingly dovish turn, the Fed will hike in September, pencil in one more for 2026," 22V Research's economist Peter Williams said.

Bank of America economist Aditya Bhave sees a similar destination, but a different route.

"Markets are pricing close to 100bp of hikes in total, over the next year or so," Bhave said. "We remain comfortable with our view that the Fed will raise rates a bit less (75bp), but much faster (by end-2026)."

The pace could also affect longer-term Treasury yields. Moving quickly may convince bond investors that the Fed will prevent inflation from becoming entrenched.

That could eventually reduce how much total tightening is needed.

2. What The Fed Says About Inflation And Growth

The dot plot will show where officials think rates are heading. The economic projections will reveal why.

Three June numbers are worth holding onto, because Wednesday is a before-and-after photograph of each.

Investors should watch whether the Fed raises its inflation forecasts while also monitoring growth and unemployment projections.

Core PCE inflation — the Fed's preferred price gauge, which strips out food and energy because those swing hardest — was forecast at 3.3% for the end of 2026 and 2.5% for 2027.

Growth was marked down to 2.2% for 2026. Unemployment was marked down to 4.3%.

Williams expects the Fed's 2026 growth forecast to rise slightly to 2.3%. He also sees the projected unemployment rate falling to 4.1% from 4.3%.

A stronger economy is usually good news for earnings. In this case, however, it could give the Fed more room to keep raising rates.

The most market-friendly outcome would be a hike accompanied by stable longer-term inflation forecasts.

That would frame Wednesday's move as insurance against the recent energy shock.

3. Whether Warsh Opens The Door To October

Warsh's press conference begins at 2:30 p.m. ET on Wednesday, 30 minutes after the decision and projections.

That may be when the real volatility arrives.

Warsh has avoided giving explicit guidance about future decisions, but he will be pressured on one question: Is October a live meeting?

Polymarket traders put 62% odds on no change at the Oct. 27-28 meeting and 57% on a hike in December.

If he stresses that inflation remains unacceptable and refuses to rule out October, markets may begin pricing an even faster cycle.

A quarter-point hike is already visible. The distance the Fed intends to travel is not.

These ETFs are likely to see elevated volatility during Warsh's press conference:

• SPDR S&P 500 ETF Trust (NYSE: SPY)
• Invesco QQQ Trust, Series 1 (NASDAQ: QQQ)
• iShares 20+ Year Treasury Bond ETF (NASDAQ: TLT)
• SPDR Gold Shares (NYSE: GLD)
• iShares Bitcoin Trust (NYSE: IBIT)