Options arbitrage risks: margin, settlement, liquidity and volatility
A bought option risks only the premium, while a sold one risks everything, and its margin is held until expiry. We go through options arbitrage risks with numbers: how much margin a $3,600 call needs, what happens in a volatility spike and why a cross-currency setup is not a lock.
Options arbitrage looks like the most precise of strategies: formulas, Greeks, parity. In reality it has its own risks, and the main one is the short leg. Below are the risks of every scheme in the course: cross-exchange setups (lesson 5) and parity (lesson 6).
| Risk | What happens | How to reduce it |
|---|---|---|
| Short-leg margin | A sold option needs margin until expiry; the requirement grows as the price moves | Calculate margin before entering, keep a buffer, small size |
| A short call’s unlimited loss | In a strong rally a sold call loses more than any premium | Only setups where the short leg is hedged |
| Margin does not net across exchanges | The long leg is up on one exchange while the short leg needs margin on another | A reserve on the short leg’s exchange, parity on one exchange |
| Different settlement currencies | Premium and payoff in coin and USDT — different assets along the way | True lock in one currency; Relative value — deliberately |
| Different settlement prices | Exchanges’ indices at expiry need not match to the cent | Keep a buffer in the spread, do not play “to zero” |
| Thin books and penny options | A spread on paper but nothing to execute; fee caps of 7–12.5% of the premium | Moneyness filter, check the book |
| Volatility spikes | IV changes by tens of percent within minutes, quotes lag | Do not enter in the middle of a move |
| Contract multipliers | XRP on Binance is 100 coins per contract, on Deribit in USDC 1,000 | Count quantity in coins, not contracts |
| Selling restrictions | Not every exchange or asset allows selling an option uncovered | Check the short leg exchange’s rules in advance |
How much margin a sold option needs
The buyer pays only the premium; no extra margin is needed. The seller holds margin. Under Deribit’s standard margin for a sold call: initial margin = MAX(0.15 − out-of-the-money distance; 0.1) + the option’s mark price, maintenance = 0.075 + mark price — all in BTC per contract.
| Metric | Calculation | Value |
|---|---|---|
| Mark price | — | 0.0462 BTC (≈ $3,571) |
| Out-of-the-money distance | (80,000 − 77,285) ÷ 77,285 | +3.51% |
| Initial margin | MAX(0.15 − 0.0351; 0.1) + 0.0462 | 0.1611 BTC (≈ $12,449) |
| Maintenance margin | 0.075 + 0.0462 | 0.1212 BTC (≈ $9,367) |
To capture a spread of a few dozen dollars on the lesson 5 setup, you need to hold about $12,449 of margin for the short leg for 55 days. As BTC rises the option gets pricier and the requirement grows, while the long leg’s profit sits on another exchange. The return on capital of such setups is fractions of a percent.
Settlement in different currencies and by different indices
A coin option on Deribit and a USDT option on Binance pay the same dollar amount only in an ideal model. In reality the long leg sits in BTC and changes its dollar value with the price, exchanges calculate settlement prices from their own indices, and margin and profit end up in different currencies. That is why the scanner labels such setups Relative value, not True lock.
Volatility spikes
On October 10, 2025, during the crash, BTC DVOL rose from 43 to 64.9 within an hour and almost returned two hours later. Implied volatility rose across all maturities, and demand shifted sharply to puts. At such moments market makers widen quotes or disconnect, exchanges update at different speeds, and a “spread” on screen may simply be one exchange lagging. Entering at such moments means risking fills at worse prices.
Penny options and fee caps
An option fee is calculated on the underlying but capped as a share of the premium: 12.5% on Deribit, 10% on Binance, 7% on OKX and Bybit. On Deribit the cap kicks in when the premium is below about 0.0024 BTC — so on cheap out-of-the-money options you pay up to an eighth of the premium on each leg. Add wide and one-sided books, and a “100% spread” on a penny option almost always loses money.
Frequently asked questions
Is options arbitrage risk-free?
Almost never. The short leg needs margin until expiry, margin does not net across exchanges, cross-currency setups carry basis and currency risk, and on cheap options fees and order books eat the spread.
How much margin do I need to sell an option?
It depends on the exchange and margin mode. On Deribit, under standard margin, a sold December BTC 80,000 call needed about 0.161 BTC of initial margin with a premium of about 0.046 BTC.
Why is a sold call dangerous?
Its loss in a rising market is theoretically unlimited. In a cross-exchange setup, the long leg’s profit sits on another exchange and does not top up the short leg’s margin.
Why are spreads on cheap options misleading?
On a penny premium a one-tick difference produces tens of percent, books are often one-sided, and the fee can reach 7–12.5% of the premium on each leg.
Sources
- 1.Inverse OptionsDeribit9/26/2026official
- 2.Portfolio MarginDeribit10/21/2026
- 3.Options BasicsOptions Industry Council
- 4.Crypto Derivatives: Analytics Report - Week 42Deribit Insights / Block Scholes10/16/2025
- 5.After record crypto crash, a rush to hedge against another freefallReuters via TradingView10/12/2025
- 6.FeesDeribit10/22/2026
- 7.What Is Options Trading?Binance
- 8.P2P.Army: options arbitrage scannerP2P.Army10/31/2026
About the author
Crypto expert, arbitrage trader and investor
Crypto expert and hands-on crypto arbitrage trader, investor and software developer with over 20 years of experience. On the P2P.Army blog he covers exchange news, P2P and cross-exchange arbitrage.
- Crypto arbitrage
- P2P arbitrage
- Cross-exchange arbitrage
- Crypto exchanges
- Investing
- Software development
