Net Harvest Score
Risk-adjusted premium-harvesting score: reward meets risk.
Definition
The harvest score penalised by dealer flow risk. A single 0-100 number that measures risk-adjusted premium-selling attractiveness.
Formula
net_harvest_score = harvest_score × (1 − dealer_flow_risk / 100)
Both inputs are 0-100 composites. The output retains the same 0-100 interpretation.
Inputs
harvest_scoredealer_flow_risk
Output
net_harvest_score (0-100)
Interpretation
- ≥ 60: high-conviction short-premium setup. Both reward and risk are aligned.
- 30–60: reduce size. Either harvest is weak or flow risk is elevated.
- < 30: do not sell premium. Reward is low or dealer flow will hurt you.
API Reference
Endpoint
GET /v1/volatility/{symbol}
Tier
Alpha
Response field
net_harvest_score
Why Net Harvest Score Matters for Trading
TL;DR
Net harvest score is the risk-adjusted version of harvest score. A fat premium with hostile dealer flow cancels out — net harvest tells you what's actually tradeable.
- What it measures
- Harvest score multiplied by (1 − dealer flow risk / 100). A 0-100 number that requires both a fat premium and supportive flow.
- What it signals
- Whether premium selling has both structural reward and structural safety right now.
- Why we measure it
- Raw harvest score can lure traders into trades where dealer flow will run over them. Net harvest closes that gap.
- Who uses it
- Systematic vol sellers, short-premium strategies, risk-managed retail. Alpha tier.
How to read Net Harvest Score
≥ 60
- Both reward and safety aligned
- Full-size premium selling
- Iron condors, short strangles, covered calls
- Best of all regime checks
Good for: full-size premium sells
< 30
- Low reward or hostile flow
- Reduce to zero
- Consider long-vol positioning
- Typical pre-regime-shift warning
Bad for: short premium
30–60
- Marginal edge
- Half or quarter size
- Only highest-conviction tickers
- Typical mid-cycle reading
Reduce size
Rules of thumb
- Prefer net harvest over raw harvest. The raw score misses flow-risk drag. Net harvest is the honest score.
- Both inputs matter. A 90 harvest + 90 flow risk = 9 net. Still too low.
- Pair with VRP regime. Regime label picks strategy; net harvest picks size.
- Flow-risk spikes into OPEX. Net harvest compresses Thu/Fri of expiry week as flow risk rises.
- Alpha tier. Both inputs are Alpha-gated; so is the composite.
Related Concepts
Ship faster
Live for 6,000+ US symbols. One API call, sub-200ms.
Stop scraping chains and coding Black—Scholes from scratch. FlashAlpha computes GEX, DEX, VEX, CHEX, 15 BSM Greeks, SVI surfaces, max pain, VRP and more — fresh every 30s, cached at the edge. Free tier, no credit card, no rate-limit games.
Free · 5/day
GEX, regime, gamma flip, max pain preview. No card.
Basic · 100/day
DEX, VEX, CHEX, full max pain, VRP, IV rank.
Alpha · higher limits
SVI surfaces, fair-vol, harvest scores, directional VRP.