ΔOI Flow & 0DTE
Where fresh options positions are built — ΔOI per strike (day-over-day change in open interest = new positioning), plus 0DTE / short-dated: gamma per strike, pins near spot and front skew from the EOD chain per core ticker.
ΔOI Flow — new positioning
The change in open interest per strike versus the prior day. Positive = build-up (new contracts), negative = unwind (closed contracts). Calls and puts separately.
ΔOI = today's open interest per strike minus the prior-day snapshot. On the first observation day there is no prior day yet — the series builds up from the next day. Source: Massive/Polygon full chain (EOD). Not a trading signal.
0DTE / Short-Dated — front expiry
The next expiry (0–2 days, else the nearest): gamma concentration per strike, pins near spot and front skew. EOD chain, not intraday flow.
Gamma concentration = Σ gamma × open interest per strike (call + put), near spot. High concentration near spot can act as a pin but is not a barrier. EOD chain, not an intraday tape — short-dated positioning, not a live 0DTE flow. Not a trading signal.
Equity Put/Call Ratio
Market-wide put/call ratio across our US equity universe (ex index ETFs), volume- and OI-based. Classic sentiment gauge: >1 = put-heavy (defensive/hedging), <1 = call-heavy (offensive/speculation). Index P/C shown separately (hedging-driven, structurally higher).
Computed from Massive full chains (near-the-money), not the official CBOE ratio. No free history available → the series accumulates daily from now. Not a trading signal.
Frequently Asked Questions
What is ΔOI flow (new positioning)?
Open interest (OI) is the number of open option contracts per strike. It changes daily through OCC settlement. The day-over-day change — ΔOI — shows where fresh positions are built (ΔOI positive) or unwound (ΔOI negative). We compare today's OI-per-strike snapshot with the prior day's and show the largest changes plus net ΔOI in calls and puts. On the first observation day there is no prior day, so the series builds up from the following day.
What does 0DTE / short-dated mean here?
We take the front expiry (0 to 2 days to expiry, else the nearest) and show gamma concentration per strike, the strikes with the highest gamma-times-OI near spot (possible pins), front skew (25-delta put minus call) and the call/put ratio by volume and OI. Important: this is the EOD chain at the close, not an intraday tape. Real 0DTE flow needs the intraday order flow, which we do not capture here — that is why we call it short-dated positioning (EOD).
Is this a trading signal?
No. This page shows backward-looking options context from open interest and the front chain — not a forecast and not investment advice. ΔOI does not reveal whether a position was opened long or short, and gamma pins are not guaranteed price targets. Options are leveraged instruments with a risk of total loss.