Short Availability

public override void Initialize()
{
    var security = AddEquity("SPY");
    // Get shortable stocks and quantity from local disk
    security.SetShortableProvider(new LocalDiskShortableProvider("axos"));
}

def initialize(self) -> None:
    security = self.add_equity("SPY")
    # Get shortable stocks and quantity from local disk
    security.set_shortable_provider(LocalDiskShortableProvider("axos"))

public override void Initialize()
{
    // Set the security initializer before requesting data to apply to all requested securities afterwards
    SetSecurityInitializer(CustomSecurityInitializer);
    AddEquity("SPY");
}

private void CustomSecurityInitializer(Security security)
{
    security.SetShortableProvider(new LocalDiskShortableProvider("axos"));
}

def initialize(self) -> None:
    # Set the security initializer before requesting data to apply to all requested securities afterwards
    self.set_security_initializer(self.custom_security_initializer)
    self.add_equity("SPY")

def custom_security_initializer(self, security: Security) -> None:
    security.set_shortable_provider(LocalDiskShortableProvider("axos"))

public class BrokerageModelExampleAlgorithm : QCAlgorithm
{
    public override void Initialize()
    {
        // In the Initialize method, set the security initializer to seed initial the prices and models of assets.
        SetSecurityInitializer(new MySecurityInitializer(BrokerageModel, new FuncSecuritySeeder(GetLastKnownPrices)));
    }
}

public class MySecurityInitializer : BrokerageModelSecurityInitializer
{
    public MySecurityInitializer(IBrokerageModel brokerageModel, ISecuritySeeder securitySeeder)
        : base(brokerageModel, securitySeeder) {}    
    public override void Initialize(Security security)
    {
        // First, call the superclass definition.
        // This method sets the reality models of each security using the default reality models of the brokerage model.
        base.Initialize(security);

        // Next, overwrite some of the reality models
        security.SetShortableProvider(new LocalDiskShortableProvider("axos"));    }
}

class BrokerageModelExampleAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        # In the Initialize method, set the security initializer to seed initial the prices and models of assets.
        self.set_security_initializer(MySecurityInitializer(self.brokerage_model, FuncSecuritySeeder(self.get_last_known_prices)))

# Outside of the algorithm class
class MySecurityInitializer(BrokerageModelSecurityInitializer):

    def __init__(self, brokerage_model: IBrokerageModel, security_seeder: ISecuritySeeder) -> None:
        super().__init__(brokerage_model, security_seeder)    
    def initialize(self, security: Security) -> None:
        # First, call the superclass definition.
        # This method sets the reality models of each security using the default reality models of the brokerage model.
        super().initialize(security)

        # Next, overwrite some of the reality models
        security.set_shortable_provider(LocalDiskShortableProvider("axos"))

public class CustomShortableProviderExampleAlgorithm : QCAlgorithm
{
    public override void Initialize()
    {
        var security = AddEquity("SPY");
        // Provide the selected security with your broker's shortable information
        security.SetShortableProvider(new MyShortableProvider());
    }
}

// Define the custom shortable provider  
class MyShortableProvider : IShortableProvider
{
    public decimal FeeRate(Symbol symbol, DateTime localTime)
    {
        return 0.0025m;
    }

    public decimal RebateRate(Symbol symbol, DateTime localTime)
    {
        return 0.0507m;
    }

    public long? ShortableQuantity(Symbol symbol, DateTime localTime)
    {
        return 10000;
    }
}

class CustomShortableProviderExampleAlgorithm(QCAlgorithm):
    def initialize(self) -> None:
        security = self.add_equity("SPY")
        # Provide the selected security with your broker's shortable information
        security.set_shortable_provider(MyShortableProvider())

# Define the custom shortable provider 
class MyShortableProvider(NullShortableProvider):

    def fee_rate(self, symbol: Symbol, local_time: datetime) -> float:
        return 0.0025

    def rebate_rate(self, symbol: Symbol, local_time: datetime) -> float:
        return 0.0507
    
    def shortable_quantity(self, symbol: Symbol, local_time: datetime) -> float:
        return 10000