Understanding how individual copy trades work on Polymarket helps you set realistic expectations, configure your bot effectively, and interpret the results you see in your portfolio. A copy trade isn't simply placing the same order a top wallet placed — it's a multi-step process where timing, sizing, and execution quality collectively determine how much of the source trader's edge you actually capture.
What Are Polymarket Copy Trades?
A Polymarket copy trade is a position you open that mirrors a position opened by a wallet you're following. In automated copy trading, a bot detects the source wallet's trade, validates it against your configured rules, sizes your proportional copy, and executes it — all within 340ms.
Each copy trade has three components that determine its quality: the entry price relative to the source trader's price (fill deviation), the position size relative to your configured capital (sizing accuracy), and the exit timing relative to how you've configured position management. All three are configurable through Polycopybot.app's dashboard.
Why Trade Timing Determines Edge
Timing is the most critical dimension of a copy trade because Polymarket prices adjust rapidly after a large wallet enters a position. When a high-conviction wallet places a significant bet, other market participants notice and begin repricing — pushing the probability in the direction of the original trade.
If your copy executes within 340ms of the source trade, you enter before most of this price movement has occurred. Your entry price is close to the source trader's entry price, which means you're carrying approximately the same edge they established when they opened the position.
If your copy executes 5 minutes later — the realistic timeline for manual copying — the market has already moved. You enter at a probability that reflects the signal the source trader acted on, meaning the market has already adjusted and most of the edge has been arbitraged away.
On an active Polymarket market, a 5% probability shift can happen in under 30 seconds after a large position is taken. A 340ms automated copy captures almost none of this adverse movement. A 5-minute manual copy may enter after the entire shift has occurred — capturing zero of the source trader's original edge.
Proportional Position Sizing
When the bot constructs your copy trade, it sizes your position proportionally to the source wallet's allocation. The logic: if the source wallet placed 4% of its balance on a position, your bot allocates 4% of your configured capital to the copy — up to your per-trade maximum.
This proportional approach preserves the conviction information embedded in the source trade's size. A wallet that bets 8% of its balance on an outcome is expressing twice the conviction of a 4% bet. Flat-size copying (always betting the same fixed amount regardless of source sizing) discards this information — you treat a tentative position the same as a high-conviction one.
Your per-trade maximum provides a safety ceiling: regardless of what percentage of the source wallet's balance they allocate, your individual copy trade never exceeds your configured absolute limit. This prevents a very large source wallet from driving disproportionate copy sizes relative to your capital base.
Fill Deviation: What It Measures
Fill deviation is the difference between the source wallet's execution price and your copy trade's execution price, expressed as a percentage of the outcome probability. At Polycopybot.app's 1.2% median, a source wallet that enters a position at 43% probability will result in a copy trade that executes at approximately 43.5% on average.
Fill deviation is driven by three factors: execution latency (faster means less market movement between the two executions), order book depth (deeper markets absorb both trades with less price impact), and slippage tolerance (tighter means better fill price but higher chance of not filling if the market moves quickly).
Polycopybot.app's default configuration optimises for the balance between fill quality and fill rate — ensuring your copy trades execute reliably while maintaining close-to-source pricing in the large majority of cases.
Position Management and Exits
A copy trade's outcome is determined not just by entry but by exit. Polycopybot.app provides three exit mechanisms:
Mirror exits: When the source wallet closes its position, your copy is automatically closed as well. This is the default mode — your position lifecycle follows the source trader's judgement on both entry and exit.
Probability targets: You can configure automatic exits when a market reaches a specified probability — for example, closing all copy positions if the underlying outcome probability rises above 85%, locking in gains before market resolution risk increases.
Loss limits: Per-position stop-loss rules close a copy trade if it loses a specified percentage from entry. This limits the downside of any individual copy trade independently from your daily loss ceiling, which applies to total portfolio activity.
Automating Your Copy Trades
Start Executing Copy Trades Automatically
Connect your wallet to Polycopybot.app and your first automated copy trade executes within 340ms of the next qualified signal. No code, no servers, no custody risk.
Go to DashboardPolycopybot.app handles every aspect of copy trade execution: signal detection via WebSocket, validation against your rules, proportional sizing, order construction, CLOB submission via delegated API, and exit management. Your role is configuration — selecting wallets, setting allocation parameters, and defining risk limits. The bot handles the rest, continuously and consistently, without fatigue or missed signals.
What are Polymarket copy trades?
Polymarket copy trades are positions placed in your account that replicate a top-performing wallet's positions proportionally. A copy trading bot detects the source trade and executes your proportional copy automatically within milliseconds.
Why does trade timing matter so much for copy trades?
Polymarket prices adjust almost immediately when a large wallet enters a position. A 340ms automated copy captures an entry very close to the source trader's price. A 5-minute manual copy often enters after the market has already priced in the signal, significantly reducing the edge you're trying to capture.
What is fill deviation on a copy trade?
Fill deviation is the difference between the source trader's execution price and your copy trade's execution price, expressed as a percentage. Polycopybot.app achieves 1.2% median fill deviation — meaning your copy entry is within about one probability point of the original position in most cases.
Does the bot also exit copy trades automatically?
Yes. When the source wallet exits a position, Polycopybot.app can automatically close your corresponding copy position. You can also configure manual exit rules — for example, closing positions that reach a specific probability target or loss threshold.