One real option chain, one expiry, one moment in time. Every contract on the same underlying — and the cost of trading them differs by more than thirty times. Tap any strike. The cheapest options are the most expensive things on the board.
Spread % is the round-trip cost of crossing, as a share of the premium. Tick floor is the tightest spread arithmetic permits: one cent divided by the premium. When a contract sits at its floor, the spread is not a liquidity opinion — it is a rounding rule, and nothing you do fixes it.