SVI-Smoothed IV

Q: What is SVI-smoothed IV?

IV derived from fitted SVI model rather than raw quotes. Eliminates noise, fills gaps, guarantees arb-free.

Q: How is it different from implied_vol?

implied_vol comes from market mid via Newton-Raphson. svi_vol comes from the surface fit. In illiquid strikes, svi_vol is much more reliable.

Q: Why does SVI-Smoothed IV matter for trading?

SVI-smoothed IV solves the 'noisy quote' problem that plagues raw IV-based systems. For computing Greeks, pricing exotics, or running systematic vol models, smoothed IV is the right input — it's the same number a professional quant desk uses. FlashAlpha exposes it as a tier-gated Alpha output.

Q: When is SVI-Smoothed IV good versus bad for a trader?

Good for model-based work: Greeks, exotic pricing, systematic vol strategies. Bad for direct quote-to-quote comparison — use raw IV there. Moderate residuals between smoothed and raw are normal; large deviations indicate surface problems.

Canonical definition, formula, interpretation, and API reference.

Definition

IV smoothed through SVI model. Eliminates bid/ask noise for a consistent, arbitrage-free value at any strike.

Formula

svi_vol = sqrt(w(k)/T)

Converts SVI total variance back to annualized IV.

Inputs

SVI parameterslog-moneynesstime

Output

svi_vol (decimal)

Interpretation

Cleaner than raw market mid IV
Consistent across the surface — no arb violations
Alpha tier only; lower tiers get null

API Reference

Endpoint

GET /optionquote/{ticker}

Tier

Alpha+

Response field

svi_vol

Why SVI-Smoothed IV Matters for Trading

TL;DR

SVI-smoothed IV is the noise-free implied vol pulled off the SVI fit. Use it for Greeks and model pricing; use raw IV for quote comparison.

What it measures: Implied vol read off the fitted SVI surface rather than from a raw market quote.
What it signals: Best estimate of 'true' IV at any strike/expiry, filtered of bid-ask noise.
Why we measure it: Raw quotes cross, go stale, or show wide spreads. SVI-smoothed is the cleaner input for any derived calculation.
Who uses it: Quants, vol traders, anyone computing Greeks off the chain. ALPHA TIER.

How to read SVI-Smoothed IV

Smooth fit, low residuals

Greeks reliable
Wing IVs stable
Safe for model pricing
Standard liquid-surface state

Good for: any model-based vol use

High residuals / arb flags

Smoothed IV disagrees with market
Raw quotes may be correct
Check arb flags
Fallback to raw

Bad for: automated quoting during stress

Small mid-range residuals

Smoothed mostly matches raw
Use smoothed for pricing
Raw for quote comparison
Typical mid-liquidity state

Reliable

Rules of thumb

Smoothed beats raw for Greeks. A delta computed from smoothed IV is stabler than one from raw.
Use raw for quote-to-quote. When comparing to actual dealer quotes, use raw. When computing model outputs, use smoothed.
Pair with SVI. Smoothed IV is a direct output of the SVI fit.
Check surface health. If SVI fit is poor, smoothed IV inherits the problems.
Alpha tier only. Smoothed IV requires the fitted surface — not in free/basic tiers.