Read price, size and time together
A bid is a displayed buying price; an ask is a displayed selling price. For a buy order, compare your contract quantity with ask size. For a sell order, inspect bid size. A quote at your desired price can disappear before execution, and a midpoint is only a calculation. The Options Industry Council explains why the bid or ask side matters more to execution than open interest. Read OIC trade entry and execution guidance.
Options bid-ask spread: a worked example
Assume an illustrative standard equity option with a $1.90 bid, $2.10 ask, bid size of 15 contracts and ask size of 4. The width is ask minus bid: $0.20 per share. The midpoint is ($1.90 + $2.10) / 2 = $2.00. Relative width is $0.20 / $2.00 × 100 = 10%.
For an order to buy 10 contracts, the displayed ask covers 4 / 10 = 40% of the requested size. Even with 20,000 contracts of OI, the snapshot supplies no price for the remaining 6. With an assumed 100-share multiplier, the full quoted width is $20 per contract, or $200 for 10 contracts. This is a spread comparison, not a forecast of slippage or a guaranteed round-trip cost; fees are excluded. Adjusted contracts can have different deliverables.
A $0.20 width on a $0.50 midpoint is 40%; the same width on a $10 midpoint is 2%. Compare both dollar and percentage width. There is no universal acceptable cutoff across premiums, strategies and order sizes.
Which observation is current?
| Field | What it measures | What to verify |
|---|---|---|
| Last quote | Most recent returned bid and ask | Quote timestamp, feed timing, both prices and displayed sizes |
| Last trade | A past execution, potentially much older | Trade timestamp and size; its price may no longer be available |
| Volume | Contracts traded in the most recent daily bar | Bar update time; zero and missing data are different |
| Open interest | Outstanding contracts at the prior trading-day close | The response supplies no exact OI date; never substitute page retrieval time |
The data provider returns quote and trade fields according to access. This tool displays available fields from one snapshot page; it does not infer missing prices or claim full-chain coverage. Massive documents the snapshot fields and pagination.
When to stop the quote comparison
- A zero bid gives no positive displayed exit bid. A missing bid is unknown. Neither becomes usable because OI is high.
- A locked quote has equal bid and ask; a crossed quote has bid above ask. Refresh and check the feed or broker before treating either as an execution opportunity. The tool withholds spread calculations for crossed and zero-sided quotes.
- A stale timestamp or delayed feed cannot establish the price available now. The adjustable age threshold is your research rule; it does not model market hours.
- An expired contract is outside this quote workflow. On expiration day, verify the contract's trading cutoff, settlement and exercise rules separately.
- For a multi-leg order, inspect every leg and the broker's combination quote. Separate leg midpoints do not establish an executable combination price.
Cboe BZX rules define locked and crossed options markets; these flags describe quote structure, not an arbitrage recommendation.
Use the check in a TradingView research workflow
Match the underlying, call or put, strike and expiration between your TradingView chart or broker chain and this snapshot. Compare timestamps before comparing prices. Recheck at the broker before placing an order; a limit price controls the price constraint but may leave an order unfilled. This page provides research information, not investment advice or order execution.
Continue with the options chain viewer for contract comparisons or return to TradingView research workflows. Sources checked October 18, 2026.