Spread checks
Bid Ask Spread in Options Backtesting
The bid/ask spread is the first execution tax an options backtest has to survive.
Use bid/ask spread as a liquidity gate and as a fill-cost input. Wide spreads should reduce position eligibility or force worse modeled fills.
Spread is a data-quality signal
A contract can have volume and still be expensive to cross. Spread percent over midpoint is a simple way to compare contracts with different premiums.
Spread is an execution input
If a strategy buys near the ask and sells near the bid, the spread is paid twice. Backtests that ignore this can overstate Sharpe and understate drawdown.
What to store
Store bid, ask, midpoint, quote timestamp, quote size, trade prints, expiration, strike, and contract type with every modeled entry and exit.
Quote vs Trade Timeline
Bid, ask, midpoint, and prints show why last price alone is fragile.
Bid/Ask Spread by Strike
Lower bars usually produce more defensible fill assumptions.
Evidence checklist
What to record before trusting an options research result
The pages in this cluster are intentionally practical: a backtest, scanner, or dashboard should preserve the evidence that made each contract eligible and each fill plausible. The table is the minimum audit trail for option-specific execution realism.
| Check | Evidence to keep | Docs |
|---|---|---|
| Contract universe | Historical contract identity, listed expiration, strike, call/put type, and as-of contract metadata. | /docs/contracts |
| Executable market | Bid, ask, midpoint, quote timestamp, quote size, and stale-quote handling around the decision time. | /docs/quotes |
| Trade confirmation | Nearby prints, sizes, exchange/condition codes, and whether prints support the assumed fill level. | /docs/trades |
| Liquidity gate | Spread percent, volume, open interest, DTE, IV, and whether the contract should have been eligible. | /docs/option-chain |
Related tools and docs
Backtest Realism Checker
Score contract, quote, trade, and spread assumptions before trusting a backtest.
Options Slippage Calculator
Translate bid/ask assumptions into dollar drag and breakeven movement.
Options Liquidity Scanner
Rank contracts by spread, volume, open interest, IV, and quote context.
Put/Call Ratio Dashboard
Track the current market put/call ratio beside weekly history across the last few years.
Options Chain Visualizer
Inspect heatmaps, IV smile, spread by strike, and volume versus open interest.
Why options backtests fail
Audit stale contracts, last-price fills, quote gaps, liquidity filters, and execution timing.
Options slippage modeling
Model midpoint, near-side, and marketable fills from bid/ask spreads and contract size.
Mid price vs fill price
Separate a reference midpoint from the executable fill assumption used by the strategy.
Bid/ask spread backtesting
Use spread width as both a liquidity gate and a cost input for every modeled entry.
Quote vs trade timeline
Validate fills with synchronized bid, ask, midpoint, and print evidence around each decision.
Options data API
See the full API surface behind these tools.
Historical options data API
Use contracts, quotes, trades, and aggregates for research workflows.
Options backtesting API
Plan historical contract and quote-aware fill sequences.
Quotes docs
Review bid/ask history fields used by realism checks.
Option chain docs
Inspect chain snapshots with Greeks, IV, volume, and open interest.