How pools work
Quote freshness
A quote is only good for a short window, so swaps never fill at an old price.
Every quote carries an expiry. At launch a quote is valid for 2 blocks, roughly 200–400 ms on Elysium. A pool rejects any swap against an expired quote; the router then uses the next best source.
The swap screen refreshes the quote every few seconds and fetches a fresh one right before you sign.