Traders Shift to Upside Bets as Bitcoin Options Expiry Reveals Thin Protection Below $70K

Bitcoin’s end-of-September options expiry reflects 130,670 BTC in open interest, up from 79,003 BTC in August — a jump suggesting strong positioning ahead of the Federal Reserve’s Sept. 16 policy decision. However, DWF Labs market insights lead Martin Lee argues that much of this increase reflects routine quarterly activity rather than aggressive Fed-driven bets.

In particular, Lee notes that September and December are key quarterly expiries, accounting for 59.3% of all open interest. These periods typically absorb repositioning flows regardless of macroeconomic events, making direct linkage to Fed expectations less clear-cut than headline numbers suggest.

Nevertheless, the market appears to have quietly repriced risk, shifting away from defensive puts toward more bullish call structures. This change coincides with renewed interest in Bitcoin amid broader macroeconomic catalysts.

The September Book Is Largely Routine

According to Lee, the top five strike prices represent 31% of September’s open interest — mirroring patterns seen in both December and March expiries. If September truly reflected a concentrated wager on Fed outcomes, the structure would likely diverge significantly from typical quarterly behavior. Instead, current positioning aligns closely with standard cyclical norms.

During the week of July’s Fed meeting, trading volume reached 14,983 contracts — considered moderate by historical standards. The real surge occurred weeks later, when weekly volume spiked to over 64,749 contracts around Aug. 19, coinciding with the U.S. Treasury’s announcement to expand long-end liquidity buybacks, raising caps from $2 billion to at least $4 billion starting Sept. 9.

This policy shift helped ease yield pressures at the long end of the curve and revived dollar-debasement narratives, boosting both Bitcoin and gold prices. Between mid-August and early September, Bitcoin rose sharply from approximately $64,100 to close near $77,000, liquidating about $4 billion worth of short positions in the process.

Stanley Druckenmiller publicly criticized the expanded buyback program, highlighting tensions within institutional circles regarding fiscal credibility. Despite these concerns, speculative momentum continues to support crypto markets.

A Year of Defensive Plays Just Passed

For nearly a year, puts dominated Bitcoin’s options landscape. From December 2025 through August 2026, the December expiry registered negative median returns monthly, with only three positive readings across 224 sessions. However, recent trends show a marked reversal — end-September calls now trade 0.97 volatility points richer than puts, compared to being 4.96 points cheaper on Aug. 3.

This swing signals growing confidence among market participants, further reinforced by robust inflows into U.S.-listed spot Bitcoin ETFs, which attracted roughly $1.92 billion last week — marking their strongest weekly performance of the year so far.

The largest single call strike for September resides at $70,000, representing 11,308 contracts. While seemingly bullish, its significance diminishes upon closer inspection: Bitcoin currently trades nearly 10% above this level, rendering those positions deeply in the money and possibly remnants of earlier price ranges.

As Lee explains:

“These contracts are almost certainly legacy exposure from when Bitcoin traded in the low $60,000s.”

Notably, 27% of September’s total open interest lies more than 30% out-of-the-money, contrasted with just 13% for the August expiry. Much of this imbalance consists of low-probability tail positions unlikely to influence near-term price action.

The most relevant band for active trading spans $78,000 to $82,000, where three clustered strikes hold approximately 14,000 contracts combined. Above this lies the psychological milestone of $100,000 — a magnet for attention but not necessarily a defined target.

Where the Least Protection Lies

Traditional analysis often focuses on identifying major support/resistance walls formed by dense options clusters. Yet Lee flips the lens by asking: “Where does the book lack meaningful safeguards?”

Currently, the September book favors calls at a ratio of 1.8-to-1, with upside bets concentrated between $78,000 and $100,000. Downside protection exists primarily at $60,000 and lower — classic catastrophe coverage purchased during volatile downturns.

Between $60,000 and $75,000, however, the density drops considerably. As Lee states:

“A sharp move down into the low 70s would land in the thinnest part of the book.”

This vulnerability coincides with a recent decline in demand for downside hedges — traders appear to be reducing their appetite for crash protection even as valuations climb.

In a bullish scenario, continued yield decompression, softening dollar strength, and sustained ETF demand could push Bitcoin past $82,000, validating today’s elevated call premiums and setting the stage for tests of $100,000.

Conversely, rising yields or hawkish Fed signals leading into Sept. 16 could trigger a correction toward $68,000–$75,000 — right where the options book offers the least cushion.

Having spent almost a year favoring put-based protections against steep declines, the market has abruptly reversed course. Now, gaps between upside wagers and emergency-level hedges leave the low-$70,000s as the least defended region — creating a potential trapdoor if sentiment sours rapidly.

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