01 · Premiums and spreads
$1,000·$10,000 are premium budgets. Bid is the selling price, Ask is the buying price, Prices are denominated in USD / Underlying 1 per unit. Mid = (Bid + Ask) / 2. Spread % = (Ask − Bid) / Mid × 100.
Estimated round-trip spread cost = Quantity × Contract multiplier × (Ask − Bid). Ask Quantity bought at ask is valued at the same quote Bid assumes selling at the bid. Cost as a share of purchase premium (Ask − Bid) / Ask and Spread %Uses a different denominator. Fees·Gas·Market impact is excluded.
02 · Order size and executability
Callput uses the public feed 1 unit basis mark × (1 ± risk premium)is used. $1k·$10k quantities are fractional estimates at these quotes. Size-dependent Callput Native price·Order limits·Liquidity is not verified.
Standard US options use 100 share contracts are whole numbers; unused budget is shown. ‘Insufficient quote size’means that quantity Bid or Ask means the order exceeds displayed size. Displayed size does not guarantee execution, Full order-book depth is unavailable VWAP is not calculated.
03 · Call and put spreads
Calls buy the lower strike + Sell the higher strike, Puts buy the higher strike + short lower-strike leg in a debit spread. ATM Main leg near the money with an outer leg about 5% Select the outer leg at this distance. Bid = Long leg Bid − Short leg Ask, Ask = Long leg Ask − Short leg Bid. Both markets use synthetic quotes from individual legs, Callput may differ from native spreads or exchange combo quotes.
04 · Expiry·Strike·Timestamp
Target expiry Callput Select the listed expiry nearest to the snapshot target date. US prioritizes the same expiry date and strikes, Show a nearby contract if unavailable. ‘Matching terms’dates only·Only strikes are matched. Expiry time·Exercise·Settlement method·Data reference times differ. BTC·ETH No comparison for assets without a direct US equity-option counterpart.
05 · Data sources
Cboe Source timestamps have no timezone and are shown as received. Callput USD is quoted in USD and settled in USDC is. Currency deviations and settlement costs are excluded.
