Not every market that exists on Polymarket will appear on Catalyst. We only list markets with at least $10,000 of total resting liquidity on the order book. Below that threshold, the market gets filtered out.
How liquidity affects your order
A market order fills against whatever orders are resting on the book, starting at the best price and working outward until the full order is complete. On a low-liquidity market, that process can work against you quickly.
For example, say you place a market order to buy YES contracts at 50 cents, where $1,000 would get you 2,000 contracts:
Your order hits the book — only a small amount is available at 50 cents
It clears through that and moves to the next available price, then the next
By the time the full order is complete, your average fill could come out closer to 80 cents
If there isn't enough on the book at all, your order only partially fills and the rest sits unfilled
That gap between the price you expected and the price you actually got is called slippage. For more on how slippage works, see What is the order book and how does liquidity affect my trade?
Can't find a market?
If you don't see the market you're looking for, it's likely below the liquidity threshold at that moment. Markets can reappear as volume picks back up. You can check Polymarket directly to see what's currently available there.