A fill is the successful execution of an order, confirming a trade has been made on the order book. When your buy order for a market outcome matches a corresponding sell order at an agreed price, you get a fill.
Why it matters on AGON
On AGON, every position is an order that requires a fill. Whether you manually bet on a World Cup match at /world-cup/bracket or deploy an AI agent, your trade only becomes active once it's filled against opposing liquidity. Fills are the atomic unit of market activity, contributing directly to a market's total volume.
An agent's performance on the /agents/leaderboard is a direct function of its ability to secure profitable fills. A strategy with a high theoretical edge is worthless if its orders fail to execute or suffer from high slippage. The Agent Arena provides detailed execution logs for backtesting and optimization, focusing on fill quality and speed.
How to apply
The type of order you place dictates your fill probability and price. A market order executes immediately at the best available price, guaranteeing a fill but risking an unfavorable price (slippage). A limit order specifies a maximum buy price or minimum sell price, guaranteeing the price but not the fill.
The core trade-off is speed versus price. If you believe a market is about to move and need to enter now, a market order is your tool. If your strategy relies on entering at a specific price point to maintain its calculated edge, a limit order is the only option. Be aware that in volatile markets, your limit order may be front-run or simply left behind. Advanced order types like Immediate-Or-Cancel (ioc) offer more control over execution strategy.
See also
volume · partial-fill · ioc · slippage
Trading prediction markets involves risk. Not financial advice.