# Other Order Types

# Order Amendments

# Margin Calculation for Amendments

The system calculates the marginal difference between the original and amended order.

Additional Margin Required = New Order Margin - Original Order Margin

Only positive differences require available margin.

# Example - Size Increase Amendment

Given:

Original Order: Sell 1 BTC at $50,000
Amendment: Increase to 2 BTC
Initial Margin Rate: 1%
Maker Fee: 0.02%
Taker Fee: 0.05%

Original Margin = (1 × $50,000 × 0.01) + Maker/Taker Fees = $500 + $35 = $535
New Margin = (2 × $50,000 × 0.01) + Maker/Taker Fees = $1,000 + $70 = $1,070
Additional Margin Required = $1,070 - $535 = $535

# Fee Structure Preservation

Amendments maintain the original order's fee structure for margin calculations.

# Example - Hidden Order Amendment

Given:

Original Hidden Order: Sell 1 BTC at $50,000
Amendment: Increase to 1.5 BTC
Hidden Maker Fee: 0.04%
Taker Fee: 0.05%

Original Margin = $500 + (Hidden Maker Fee + Taker Fee) = $500 + $45 = $545
New Margin = $750 + (Hidden Maker Fee + Taker Fee) = $750 + $67.50 = $817.50
Additional Margin Required = $817.50 - $545 = $272.50

# Aggressing Amendments

When an amendment causes an order to aggress, margin is calculated using actual execution prices.

# Example - Price Amendment Causing Aggression

Given:

Original Order: Buy 1 BTC at $49,000
Best Offer: $49,500 for 0.5 BTC, $50,000 for 1 BTC
Amendment: Change price to $50,000
Initial Margin Rate: 1%

Execution Prices:
0.5 BTC at $49,500
0.5 BTC at $50,000

New Margin = (0.5 × $49,500 × 0.01) + (0.5 × $50,000 × 0.01) + Taker Fees

# Post-Only Orders

Post-only orders use the standard resting order margin calculation.

# Reduce-Only Orders

Reduce-only orders are always accepted without margin requirements, as they can only decrease position size and risk.

# Key Characteristics

No margin requirements
Automatically accepted regardless of account balance
Cannot increase position size in either direction
Useful for risk management and position unwinding

# Example - Reduce-Only Order

Given:

Current Position: Long 5 BTC
Account Balance: $0
Available Margin: $0
Reduce-Only Order: Sell 3 BTC at $50,000

Result: Order Accepted
Rationale: 
- Order can only reduce position from 5 BTC to 2 BTC
- No margin required as risk is being reduced
- Account balance irrelevant for acceptance

# Example - Invalid Reduce-Only Order

Given:

Current Position: Long 2 BTC
Reduce-Only Order: Sell 3 BTC at $50,000

Result: Order Rejected
Rationale:
- Order would reverse position direction
- Violates reduce-only constraint
- Rejection occurs before margin check

# Market Orders

Market orders calculate margin based on effective execution prices across filled levels.

# Example - Market Order Execution

Given:

Market Buy Order: 2 BTC

Order Book:

Ask: 1 BTC at $50,000
     1 BTC at $50,500

Initial Margin Rate: 1%

Margin for First BTC = 1 × $50,000 × 0.01 = $500
Margin for Second BTC = 1 × $50,500 × 0.01 = $505
Taker Fees = 2 × $50,250 × 0.0005 = $50.25

Total Margin Required = $500 + $505 + $50.25 = $1,055.25

# Triggered Orders

# Stop Orders and If-Touched Orders

Margin checks occur at trigger time for:

Stop Orders
Stop Limit Orders
Market If Touched (MIT)
Limit If Touched (LIT)

If margin is insufficient at trigger time, the order is canceled.

# Example - Market If Touched Order

Given:

Current Position: Long 1 BTC
Market If Touched: Buy 2 BTC when price touches $48,000
Initial Margin Rate: 1%
Taker Fee: 0.05%
Available Balance at Order Entry: $5,000
Available Balance at Trigger: $500

At Trigger Time:
Required Margin = 2 × $48,000 × 0.01 = $960
Required Fees = 2 × $48,000 × 0.0005 = $48
Total Required = $1,008

Result: Order is canceled due to insufficient margin at trigger time

This example demonstrates that:

No margin is reserved at order placement
Full margin check occurs at trigger
Order cancels if account lacks sufficient margin when triggered