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SPY ZGL

What it is

SPY ZGL — registry key spy_zgl.

Daily-signals column exposed for sparkline charts; raw value, no classification bands.

Source

Source module: market
Data source: live_only

Fetched directly from app/sources/market.py; see source code for the upstream API call and any provider-specific handling.

How it’s computed

SPY Zero-Gamma Level: spot price at which net dealer gamma flips sign. Computed from the Schwab option-chain gamma profile by interpolating between adjacent strikes where dealer gamma crosses zero.

Where it surfaces

• API field: gamma_levels.zgl on GET /api/v1/signals/latest
• Surface: daily_signals row (daily-cadence persistence)
• Surface: /signals/sparklines (UI sparklines)

Health-score / alignment role

Data carrier — no implication, no health-score contribution.

Persisted for downstream consumers (sparklines, base-rate matcher, calibration substrate) but does not classify into BULLISH / NEUTRAL / BEARISH and does not contribute to the 0-100 health score.

Release cadence

• Publishes: intraday

See also

• /kb/api/get-signals-gamma — API endpoint that serves this field.