$ATOM is quoting 1.402 bid against 1.403 ask - exactly one tick apart. The pair's price filter puts tickSize at 0.001, so around this price the book can't show a spread narrower than roughly 0.07%. So tightness here is partly a property of the pair itself, not a verdict on how keenly it's being quoted. Behind those two quotes sit 418 ATOM and 297 ATOM, and that is what a market order meets first. Read at 17:49 UTC on 5 November.