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implied-volatility-surface

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SPX Option Implied Volatility Surface using SVI Parameterisation, its variants and the Heston Stochastic Volatiltiy Model. Implements and studies interpolation and smoothing techniques used by Bloomberg for Equity Option Vol Surface Construction.

  • Updated Sep 27, 2026
  • Python

Arbitrage-free implied volatility surfaces on SPY options: raw SVI, constrained SVI and SSVI, butterfly/calendar arbitrage audit, Dupire local vol and barrier pricing under local vs flat vol. Tested, CI on Python 3.11–3.13.

  • Updated Nov 3, 2026
  • Jupyter Notebook

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