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How Simulated Fills Are Determined

Updated


At a Glance

  • Orders price against live market price and liquidity, never a stale one.
  • The fill price and slippage on your ticket are estimates.
  • Your order never consumes real liquidity, so it never moves the market.
On this page4 sections

What Happens When You Submit an Order

  1. You build the order. The ticket shows your limits, an estimated fill price, and estimated slippage or price impact.
  2. Size is validated against both limits β€” what your account has left of its max open size, and what that market has left of its 5%. Over either one, the order is blocked, not trimmed down to fit. See Max Open Size and Market Limits.
  3. Market state is validated. A restricted market state will not accept a new position, and the opening and increasing controls are unavailable during the final 30 seconds before a stated close time. See Market and Position Rules.
  4. Live price and liquidity are checked, as they are at that moment β€” not as they were when the estimate was generated.
  5. The order fills, requotes or is rejected.

Estimated Fill Price and Slippage

Estimated slippage is the expected difference between the price on your screen and the price your order clears at. Estimated price impact is the part of that difference attributable to your own order's size.

FPT does not promise a fill price and does not treat a gap between estimate and realised fill as an error. Estimates widen in thin markets, on larger orders, during fast-moving news and as expiration approaches, and narrow in deep markets. A wide estimate blocks nothing.

Why an Order Might Not Fill

ReasonWhat you seeWhat to do
Over the size you can openBlocked, with the size available statedResize and submit again
Price moved beyond toleranceRequote or rejectionReview the new price and resubmit
Liquidity insufficient at any acceptable priceRejectionReduce size or pick a deeper market
The market's state blocks itBlocked, rejected or repricedWait for the state to clear

How a Simulated Fill Differs from a Live One

The price impact you are shown is modelled: what an order that size would plausibly have cost given the observed price and liquidity. See Are FPT Accounts Simulated? and the Simulation and Risk Disclosure.

A fill lands on an FPT Trading Day, it feeds your qualifying days and the 40% consistency calculation, and any open position's marked value enters the end-of-day snapshot that sets your trailing drawdown floor.

If a fill looks wrong rather than unfavourable, email support@fundedpredictiontrader.com with the market, the order and the timestamp.

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