Why gamma levels can disagree
Why two models can read the same option chain and produce different walls, flips, and exposure estimates.
Two gamma tools can read the same chain and draw different levels because every output depends on inputs and assumptions. Sign conventions, implied volatility, time to expiry, carry, contract filtering, quote quality, and calculation timing can all change the result.
The shortcut everyone takes
A static snapshot can become less representative as spot, implied volatility, time, and the available chain change. Near expiry, especially on 0DTE contracts, small input differences can move an estimate materially. Refreshing more often does not remove upstream delay or make open interest intraday data.
Doing it properly
SteadyTrader recomputes Black-Scholes-style Greeks from available chain inputs, applies parity-implied carry and a stated sign convention, and keeps model outputs beside price. That process can make assumptions easier to inspect, but it does not validate dealer inventory or guarantee that a wall holds. Compare outputs with primary broker and exchange data before making a decision.