# Dry Run Orders

# Overview

Dry Run Orders provide a read-only mechanism to simulate order placement without affecting market state or account balances. This feature is useful for building user interfaces that need to display expected order outcomes before actual submission.

# Purpose

Dry run orders allow developers and traders to:

Preview margin requirements before placing orders
Validate order parameters without market impact
Build responsive trading interfaces with real-time feedback
Test order scenarios without consuming actual resources

# How to Use Dry Run Orders

# Endpoint

POST http://control-gateway:8181/AccountAdmin/Order/DryRun

# Request Format

The dry run endpoint accepts identical parameters to the standard order placement endpoint. Simply send your order request to the dry run endpoint instead of the live trading endpoint.

# Response Format

{
  "marginRequired": 0,
  "marginAvailable": 0,
  "totalUsedMargin": 0,
  "riskUsed": 0,
  "riskAvailable": 0,
  "rejectReason": "ImmediateMatchPostOnly",
  "rejectionType": "InvalidTickSize",
  "amendRejectionType": "InvalidTickSize"
}

# Response Fields

# Margin Information

Field	Description
`marginAvailable`	Available margin on the account, excluding any margin that would be used by resting orders and positions, not including the effect of the dry run order
`marginRequired`	Additional margin that would be required by the order being simulated
`totalUsedMargin`	Total margin currently used by existing positions and orders, excluding the dry run order

# Risk Information

Field	Description
`riskUsed`	Total risk that would be used by the dry run order
`riskAvailable`	Total amount of risk available before adding the dry run order

# Rejection Information

Field	Description
`rejectReason`	Indicates a stateful validation failure (e.g., reduce-only order would increase position)
`rejectionType`	Indicates a stateless validation failure (e.g., order quantity exceeds maximum)
`amendRejectionType`	Reserved for future amendment dry run functionality

# Important Limitations

# No Market Impact

Dry run orders never interact with the market
No executions are generated
Account state remains completely unchanged
Orders cannot be canceled (they don't exist after the response)

# Hidden Order Information

Dry run responses do not leak information about hidden orders in the market
Actual execution results may differ from dry run results if hidden orders are present
This protects market integrity while providing useful simulation data