Returns the Vanna-Charm Meta-signal (VCM) for the specified symbol. The VCM combines vanna and charm exposures into a unified flow estimate, weighted by their relative strength in the current environment. It captures the second-order greek flows that drive intraday price dynamics beyond raw gamma positioning.
Parameters
Path Parameters
Name
Type
Required
Description
symbol
string
Required
Underlying symbol. One of: SPX, SPY, QQQ, IWM, NDX, RUT.
Response
The response data object contains:
vcm_indexnumberVanna-Charm Meta-signal index from -1.0 to +1.0. Positive indicates net buying flow from vanna and charm; negative indicates net selling flow.
dominant_forcestringWhich greek is driving more flow: "vanna", "charm", or "balanced"
vanna_weightnumberWeight of vanna contribution to the VCM (0.0 to 1.0)
charm_weightnumberWeight of charm contribution to the VCM (0.0 to 1.0)
estimated_flownumberEstimated dollar flow from combined vanna and charm hedging activity
flow_directionstringNet direction of the estimated flow: "buying", "selling", or "neutral"
confidencenumberConfidence in the VCM estimate from 0.0 to 1.0
regime_effectstringHow the VCM flow interacts with the current gamma regime (e.g., amplifying, dampening, neutral)
descriptionstringHuman-readable summary of the current VCM state
Note
Vanna dominates the VCM when implied volatility is changing rapidly. Charm dominates near end-of-day and near expirations. The dominant_force field tells you which greek is currently driving the signal, which affects how you should interpret the flow estimate.
curl -X GET "https://api.gexengine.com/v1/vcm/SPX" \
-H "X-API-Key: YOUR_API_KEY"