What “disagreement” means
Two venues can show different mark IVs for options that look similar: same asset ticker, similar expiry date, similar strike. Economically they may still differ in settlement index, contract multiplier, inverse vs linear margin, exercise style, fee schedule, and credit of the venue.
True arbitrage requires the ability to buy cheap, sell rich, hedge residual risks, and clear capital — all with costs below the gap. Most retail-visible IV gaps fail one of those tests.
OptionsMatch divergence and multi-venue chain views exist to highlight disagreements for research literacy, not to promise executable free lunches.
Alignment checklist before you compare
1) Same underlying index definition? 2) Inverse vs linear? 3) Expiry timestamp and settlement method? 4) Strike listing and contract size? 5) European-style cash settlement details? If any answer differs, you are comparing cousins, not twins.
Convert prices to a common IV and common notional when possible. A “2 vol” gap on a micro contract may be noise relative to a 0.5 vol gap on the deep book.
Check timestamps. Stale marks on a thin venue create phantom edges. Respect live/partial/mock provenance banners on OptionsMatch.
Costs that eat gaps
Crossing two bid-ask spreads, taker fees on both legs, funding on delta hedges, withdrawal fees, on-chain gas, and the opportunity cost of locked margin all reduce theoretical edge.
KYC and geographic restrictions may prevent you from accessing one side of the trade entirely. An IV that is “cheap” on a venue you cannot use is not your edge.
Transfer latency means prices move while coins travel. Crisis periods — when gaps widen — are exactly when transfers slow or halt.
Residual risks even after a “locked” package
If products are imperfect substitutes, settlement can diverge. If hedges use perps, funding path matters. If margin is siloed, one leg can liquidate while the other thrives.
Pin risk and gamma near expiry can hit the short venue harder. Multi-leg cross-venue packages inherit the worst of multi-leg execution and multi-venue credit risk.
Operational risk (API outages, forced delistings, collateral haircuts) is part of the trade’s true Sharpe, whether or not your spreadsheet includes it.
A sober research workflow
1) Align products. 2) Compare mark IV and tradable IV (through the spread). 3) Map fees and frictions. 4) Simulate margin on both venues. 5) Size only what you can hedge and clear. 6) Track outcomes versus hypothesis — many “edges” are data artifacts.
Start with observation journals rather than capital. If you cannot explain the gap with a structural reason, be twice as skeptical.
Related cash-and-carry thinking applies: relative value first, leverage last.
How OptionsMatch fits
Divergence desks, multi-venue chains, and venue profiles compress the comparison layer. Execution still happens on venues you onboard. Affiliate or hop links (/go) may appear in Match CTAs — they do not change the economics of edge.
Educational mandate: learn to ask better questions when books disagree. “Which risk am I actually paid to take?” is a better question than “How do I ape both sides?”
When gaps persist with structural explanations (different user bases, different settlement), the “arb” may simply be a permanent risk premium differential — trade it only if you want that risk.