How Close Can a Trader Bot Get to the Trader's Bet Size?
Polycopy Trader Bots copy at one flat size and never scale to the trader's bet. How to set Max Per Trade near the trader's typical bet, how much budget that needs, and why sizing is flat.
Last updated September 14, 2026
Know the product limit
A Trader Bot can't size copies in proportion to the trader. Every copy is the same size: your Max Per Trade amount. There is no setting that copies "10% of the trader's buy", and no Conviction or Kelly sizing on new bots. Slippage, minimum order size, rounding and your filters can also change or skip copies.
Why sizing is flat
Copies that scaled with the trader's bet made less money than flat copies when we measured them, and the more they scaled, the worse they did.
Set Max Per Trade near their typical bet
Check the trader's usual bet size on their profile. When you create the bot, open Advanced settings and set Max Per Trade close to it. If they usually bet $30 to $80, something like $50 gets you close on most trades. Every copy is still that one amount, whether their bet was big or small. After launch you can change it in Manage bot.
Give it enough budget
Max Per Trade can't be more than your budget, and a fully invested bot waits for cash to come back before it copies again. Set the budget to at least 10 to 20 times Max Per Trade so the bot can hold several positions at once.
One bot per trader is usually enough
You may run up to five active bots on the same trader, so you can test two setups side by side. On a flat copy size there is very little for a second bot to prove, and each one draws on the same Polymarket cash. Pause and sell all sells a duplicate's open positions, so retiring one is not free. Plain Pause keeps them.
Keep Mirror Sells on
Mirror Sells is on by default. Keep it on if you want your exits to follow the trader's. You can change it in Manage bot after launch.