The US dollar just had its best day in months, and crypto felt every bit of it.

The dollar index climbed to 100.85 on June 18, its highest reading since November, after the Federal Open Market Committee wrapped up a meeting that left markets recalibrating their assumptions about where interest rates are headed.

What the Fed actually said

The FOMC voted to keep the federal funds rate in its current range of 3.5% to 3.75% at its June 17 meeting. Nine out of eighteen Fed officials now expect at least one rate hike before the end of 2026, with the median projection landing at 3.8%.

On Kalshi, the prediction market platform, the probability of a Fed rate hike happening later in 2026 jumped to 57%. Just days before the meeting, that number sat at 35%. A 22-percentage-point swing in a matter of hours is the kind of move that reshuffles portfolios.

For context, the Fed spent much of 2025 cutting rates after the aggressive hiking cycle that defined 2022 and 2023.

Bitcoin takes the hit

Bitcoin dropped to the low $62,000s on June 18, shedding thousands of dollars in value almost immediately after the FOMC statement hit. By later in the session, Bitcoin had partially recovered to around $64,000.

Spot Bitcoin and Ether exchange-traded funds saw combined outflows exceeding $111 million in the immediate aftermath of the announcement.

Why a strong dollar hurts crypto

When the dollar strengthens, US-denominated assets, particularly Treasury bonds and money market funds, offer more attractive returns. This is the classic risk-off trade. Capital flows from speculative assets toward safer ones, and crypto sits firmly in the speculative bucket for most institutional allocators. The $111 million in ETF outflows is a direct expression of this dynamic.

There’s also a global dimension. A stronger dollar makes Bitcoin more expensive for international buyers, which can suppress demand from non-US markets.

The last time the dollar index was at these levels, back in November, Bitcoin was trading in a similar range before rallying through the end of 2025.

What this means for investors

The 57% probability on Kalshi for a 2026 rate hike is not certainty. It’s a coin flip with a slight lean. But that lean is enough to keep the dollar bid and crypto on its back foot until the data changes.

Investors should be watching two things closely. First, inflation prints over the coming months, because those will determine whether the Fed’s hawkish lean translates into actual policy action. Second, ETF flow data, because sustained outflows would confirm that institutional money is genuinely rotating away from crypto rather than just hedging for a day. The difference between a one-day $111 million outflow and a multi-week trend is the difference between a buying opportunity and a regime shift.