Bitcoin Options Expiry Shows Heavy Call Skew and Weak Downside Protection

Bitcoin’s end‑of‑September options expiry recorded 130,670 BTC of open interest, up from 79,003 BTC in August. The increase reflects routine quarterly positioning rather than a direct bet on the Federal Reserve’s upcoming decision.

Quarterly Expiries Dominate Open Interest

September and December expiries together hold 59.3 % of all Bitcoin options open interest, as traders roll positions into these quarterly contracts. The top five strikes account for 31 % of September’s open interest, a concentration similar to December and March, indicating a standard quarterly structure.

Call Skew and Near‑Spot Positioning

Calls now trade about 0.97 volatility points richer than puts, a swing of nearly six points since early August. The most significant call strike is $70,000 with 11,308 contracts, but Bitcoin is already trading roughly 9.8 % above that level, suggesting the exposure is largely legacy.

The live upside zone lies between $78,000 and $82,000, where three strike lines together hold around 14,000 contracts. A psychological magnet appears at $100,000, though it is not a concrete target.

Weak Downside Protection

Downside insurance is concentrated at $60,000 and below, while the $68,000–$75,000 range shows thin protection. A sharp move into the low $70,000s would hit the least protected part of the book.

Potential Scenarios

• Bull case: Continued dollar weakness, easing long‑end yields, and strong ETF inflows could push Bitcoin toward $82,000–$100,000, validating the call‑heavy skew.
• Bear case: A hawkish Fed decision or rebounding yields could drive Bitcoin down to $68,000–$75,000, landing in the thin‑protected zone.

The market’s current exposure leaves the low $70,000s as the area with the least hedge coverage.