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© 2026 Gemini Space Station, Inc.

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Exchange-Bound Messages

New Order Single <D> (LIMIT)

To submit a new limit order to Gemini, send a New Order Single <D> message with OrdType Limit.

Gemini will respond to a New Order Single <D> message with an Execution Report <8>. See Execution Report <8> for examples.

If Gemini receives a New Order Single <D> message with the PossResend <97> flag set to Y in the header, that order will be rejected with Business Message Reject <j>.


Fields

Tag

Name

Req

Description

Standard Header

Y

MsgType = D

11

ClOrdID

Y

Unique identifier of the order as assigned by the institution. Uniqueness must be guaranteed by the institution for the duration of the connection to the order entry channel.

23

IOIID

N*

Unique identifier of an IOI.

 

*Required when responding to an IOI.

18

ExecInst

N

Used for specific execution options in combination with TimeInForce <59>.

 

6 = Participate don't initiate (denotes maker-or-cancel when combined with TimeInForce value 1 = Good Till Cancel (GTC))

38

OrderQty

Y

Decimal quantity. Full quantity will be visible on the book.

110

MinQty

N*

40

OrdType

Y

Order type.

 

Valid values:

2 = Limit

44

Price

Y

Decimal price.

 

Price is required when OrdType <40> is 2 = Limit.

54

Side

Y

Side of the order.

 

Valid values:

1 = Buy

2 = Sell

55

Symbol

Y

Ticker symbol of the order.

 

See Supported Symbols for valid values.

59

TimeInForce

Y

Specifies how long the order remains in effect.

 

Valid values:

1 = Good Till Cancel (GTC)

3 = Immediate Or Cancel (IOC)

4 = Fill Or Kill (FOK)

60

TransactTime

Y

Time of order creation (expressed in UTC).

544

CashMargin

N

Identifies whether order is a margin order or a non-margin order.

 

Valid values:

1 = Cash

2 = Margin Open

 

This field is optional. If not provided, the order is assumed to be a non-margin (cash) order.

Only accounts enabled for spot margin trading can specify margin orders.

3 = Margin Close is not supported.

Restriction: This field is only supported for buy orders (Side=1). Specifying this field on sell orders (Side=2) will result in a reject with error message: "CashMargin <544> not supported for sell orders".

Standard Trailer

Y

Last modified on April 17, 2026
When Trades OccurNew Order Single (Market)
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