The last traded price is not your entry price

A market page can show a last trade at 62 cents. That is evidence that two orders matched there, not a promise that your next order will get the same price.

The executable quote depends on which side you take, how much size is waiting, and how quickly the book moves.

Start with your side of the book

A buyer usually consumes offers while a seller reaches for bids. A last trade between those prices may be unavailable by the time you click.

Before calling a price an entry, note the best quote on your side and the quantity behind it. The direction of the trade changes the answer.

Scale the quote to your order

Imagine ten shares offered at 62 cents and another 90 at 64 cents. A 100-share order does not have a 62-cent entry; it has a blended price before fees.

Write down the expected fill for the size you intend to trade. A small test order and a full position are different market observations.

Log what was executable

Keep the timestamp, side, size, spread, and fee estimate with the decision. Later, compare the idea with the price you could actually trade, not the most convenient number on the page.

The useful question is not where the last print happened. It is where your order can fill, at your size, after the costs that belong to your side of the book.

Further reading: Prices and order books · Resolution rules · Current fees.

Explore the markets: Open Polymarket (referral link).