Order Entry

New Order Single (35=D)

Used to submit a new order to the Exchange.

Tag	Name	Type	Required	Description
11	ClOrdID	String	Y	Client order ID for idempotency. UUID preferred, max 64 chars. Must not match any open order.
18	ExecInst	Char	N	`6`=Post Only
38	OrderQty	Decimal	Y	Quantity of contracts. Fractional quantities supported.
40	OrdType	Char	Y	`2`=Limit
44	Price	Decimal	Y	Limit price per contract. Whole cents (1–99) by default, or dollars with up to four decimal places when `UseDollars=Y`. See Subpenny Pricing.
50	SenderSubID	String	N	Clearing FCM sponsored access only. Header field identifying the operator for this order; printable ASCII, max 16 characters.
54	Side	Char	Y	`1`=Buy (Yes), `2`=Sell (No)
55	Symbol	String	Y	Market ticker (e.g. `EURUSD-23JUN2618-B1.087`)
100	ExDestination	Integer	N	Exchange index. On event-contract sessions, omit or use `-1` to auto-route by market ticker. This field should not be included for margin. It will be ignored. `UseCapReservation` (21032) sessions must auto-route.
59	TimeInForce	Char	N	`0`=Day (expires 11:59:59.999pm ET), `1`=GTC, `3`=IOC, `4`=FOK, `6`=GTD. Past GTD dates are treated as IOC.
126	ExpireTime	UTCTimestamp	C	Required when TimeInForce=GTD.
117	QuoteId	UUID	N	Quote to accept when using NewOrderSingle for an RFQ quote acceptance.
448	PartyID	String	N	FCM only. Full customer-account identifier in `<fcm_user_id>_<suffix>` format. See FCM customer-account identifiers.
452	PartyRole	Integer	N	FCM only. `24`=Customer Account. Required when using PartyID.
453	NoPartyIDs	Integer	N	FCM only. Number of parties (only 1 supported).
79	AllocAccount	Integer	N	Subaccount number (0–63). Alternative to NoPartyIDs.
526	SecondaryClOrdID	UUID	N	Order group identifier.
2964	SelfTradePreventionType	Integer	N	`1`=Taker At Cross (default), `2`=Maker
21006	CancelOrderOnPause	Boolean	N	Cancel order if trading is paused.
21009	MaxExecutionCost	Decimal	N	Max execution cost in dollars. Order canceled if unable to fill within cost.
21023	RfqId	UUID	N	Server-assigned RFQ ID when using NewOrderSingle to accept an RFQ quote. If provided, the quote must belong to this RFQ.

FCM customer-account identifiers

For FCM customer accounts (PartyRole<452>=24), send the full subtrader identifier in PartyID<448>: <fcm_user_id>_<suffix>. The prefix is the FCM’s 36-character UUID, followed by an underscore (_) delimiter and a suffix of 1–16 case-sensitive ASCII alphanumeric characters (A-Z, a-z, 0-9). The full identifier is at most 53 characters, including the delimiter. For example: 550e8400-e29b-41d4-a716-446655440000_customer1. Order Cancel and Order Cancel/Replace requests must use the same full identifier as the original order. Execution Reports return the full customer-account identifier unchanged in the PartyRole=24 entry, including the UUID prefix, underscore, and suffix. A PartyRole=12 entry instead contains the operator identifier captured from SenderSubID<50>.

SenderSubID<50> is captured on an ordinary NewOrderSingle and, per action, on OrderCancelRequest and OrderCancelReplaceRequest; it is ignored on RFQ quote acceptance. The operator on a NewOrderSingle sticks to the order: fills and other lifecycle reports emit it as the PartyRole=12 party. Cancel and Cancel/Replace acknowledgements instead emit the operator sent on that request — the operator who performed the action — falling back to the order’s creating operator when the request carried none. Do not send tag 50 on Logon: Kalshi rejects that Logon.

8=FIXT.1.1|9=200|35=D|34=5|52=20230809-12:34:56.789|49=your-api-key|56=KalshiNR|
11=550e8400-e29b-41d4-a716-446655440000|38=10|40=2|54=1|55=HIGHNY-23DEC31|44=75|
59=1|10=123|

Order Cancel/Replace Request (35=G)

Used to modify an existing order without canceling it.

Supported Modifications

OrderQty: Increases or decreases the quantity of your order, note that increasing the quantity for the same point means forfeiting your queue position
Price: Changes the limit price of your order

Tag	Name	Type	Required	Description
11	ClOrdID	String	Y	Unique modification request ID. UUID preferred, max 64 chars.
37	OrderID	String	N	Exchange-assigned order identifier. Required on `UseCapReservation` (21032) sessions.
38	OrderQty	Decimal	Y	New total quantity. If equal to filled qty, order is canceled. If less, rejected.
40	OrdType	Char	Y	`2`=Limit
41	OrigClOrdID	String	Y	ClOrdID of the order to modify.
44	Price	Decimal	N	New limit price. Required if changing price. Whole cents (1–99) by default, or dollars with up to four decimal places when `UseDollars=Y`. See Subpenny Pricing.
50	SenderSubID	String	N	Clearing FCM sponsored access only. Header field identifying the operator performing this modification; printable ASCII, max 16 characters.
54	Side	Char	Y	Must match original order.
55	Symbol	String	Y	Must match original order.
100	ExDestination	Integer	N	Exchange index. On event-contract sessions, omit or use `-1` to auto-route by `Symbol`. This field should not be included for margin. It will be ignored. `UseCapReservation` (21032) sessions must auto-route.
448	PartyID	String	N	FCM only. Full customer-account identifier; must match the original order.
452	PartyRole	Integer	N	FCM only. `24`=Customer Account. Must match original order. Required when using PartyID.
453	NoPartyIDs	Integer	N	FCM only. Must match original order (only 1 supported).
79	AllocAccount	Integer	N	Subaccount number (0–63). Must match original order.

Order Cancel Request (35=F)

Cancel all remaining quantity of an existing order.

Tag	Name	Type	Required	Description
11	ClOrdID	String	Y	Unique cancel request ID. UUID preferred, max 64 chars.
37	OrderID	String	N	Exchange-assigned order identifier.
41	OrigClOrdID	String	Y	ClOrdID of the order to cancel.
50	SenderSubID	String	N	Clearing FCM sponsored access only. Header field identifying the operator performing this cancel; printable ASCII, max 16 characters.
54	Side	Char	Y	Must match original order.
55	Symbol	String	Y	Must match the original order. Required for auto-routing.
100	ExDestination	Integer	N	Exchange index. On event-contract sessions, omit or use `-1` to auto-route by `Symbol<55>`, which is required for auto-routing. This field should not be included for margin. It will be ignored.
448	PartyID	String	N	FCM only. Full customer-account identifier; must match the original order.
452	PartyRole	Integer	N	FCM only. `24`=Customer Account. Must match original order. Required when using PartyID.
453	NoPartyIDs	Integer	N	FCM only. Must match original order (only 1 supported).
79	AllocAccount	Integer	N	Subaccount number (0–63). Must match original order.

Execution Report (35=8)

Sent by the exchange to reflect order state changes.

Tag	Name	Type	Required	Description
6	AvgPx	Decimal	Y	Average price of all fills on this order. Cents by default, or dollars when `UseDollars=Y`. See Subpenny Pricing.
11	ClOrdID	String	Y	ClOrdID from the last message that changed the order.
14	CumQty	Decimal	Y	Total quantity filled so far.
17	ExecID	String	Y	Unique report ID, sequenced within an exchange index. Format: `clock;event` for exchange index `0` (e.g. `4;7`) and `clock;event;exchange_index` for other indexes (e.g. `4;7;1`). `"-1;-1"` for PENDING reports.
30	LastMkt	String	C	Exchange index that produced the report.
31	LastPx	Decimal	C	YES fill price, regardless of Side(54). To display the NO fill price, subtract LastPx from 1 in dollar mode (`UseDollars=Y`), or from 100 in cents mode. Whole cents by default, or dollars with four decimal places when `UseDollars=Y`. Present only for ExecType=Trade. See Subpenny Pricing.
32	LastQty	Decimal	C	Fill quantity. Present only for ExecType=Trade.
37	OrderID	String	Y	Exchange-assigned order identifier.
38	OrderQty	Decimal	Y	Total order quantity. OrderQty = CumQty + LeavesQty.
39	OrdStatus	Char	Y	Current order status. See Order Status below.
41	OrigClOrdID	String	C	Previous ClOrdID. Present for Replaced/Canceled orders.
44	Price	Decimal	C	Order limit price per contract. Whole cents by default, or dollars with four decimal places when `UseDollars=Y`. See Subpenny Pricing.
54	Side	Char	Y	`1`=Buy (Yes), `2`=Sell (No)
55	Symbol	String	Y	Market ticker.
58	Text	String	N	Human-readable result description. See Text Field Values below.
60	TransactTime	UTCTimestamp	C	Timestamp of the triggering event.
103	OrdRejReason	Integer	C	Rejection reason. Present when ExecType=Rejected. See below.
126	ExpireTime	UTCTimestamp	C	Expiration timestamp. 11:59pm ET for Day orders.
150	ExecType	Char	Y	Report reason. See Execution Types below.
151	LeavesQty	Decimal	Y	Remaining quantity open for execution.
448	PartyID	String	N	FCM only. For `PartyRole=24`, the full customer-account identifier is returned unchanged, including the UUID prefix, underscore, and suffix. For `PartyRole=12`, the operator identifier captured from SenderSubID (50).
452	PartyRole	Integer	N	FCM only. `24`=Customer Account, `12`=Executing Trader. Present when PartyID is present.
453	NoPartyIDs	Integer	N	FCM only. Number of parties. Up to 2 when both customer account and operator are present.
79	AllocAccount	Integer	C	Subaccount number (0–63). Present if order was placed for a subaccount.
715	ClearingBusinessDate	LocalMktDate	C	Clearing date (`YYYYMMDD`), using the Eastern calendar date of TransactTime. Present only for ExecType=Trade.

Order Status (39)

New<0>: Active order, no fills
Partially Filled<1>: Some quantity filled
Filled<2>: Completely filled
Canceled<4>: Canceled (may have partial fills)
Replaced<5>: Order modified via Cancel/Replace
Pending Cancel<6>: Cancel pending
Rejected<8>: Order rejected
Pending New<A>: Order pending acceptance
Expired<C>: Time in force expired
Pending Replace<E>: Modification pending

By default, expiry-style system cancellations are reported as Canceled<4>.
If Logon tag 21012 (UseExpiredOrdStatus)=Y, expiry-style system cancellations (CloseCancel and OrderExpiryCancel) are reported as Expired<C>.

Order Rejection Reasons (103)

Unknown symbol<1>
Exchange closed<2>
Order exceeds limit<3>
Too late to enter<4>
Duplicate order<6>
Stale order<8>
Unsupported order characteristic<11>
Incorrect quantity<13>
Unknown account<15>
Other<99>

Execution Types (150)

New<0>: Order accepted
Trade<F>: Order filled (partial or complete)
Canceled<4>: Order canceled
Replaced<5>: Order modified
Rejected<8>: Order rejected
Expired<C>: Order expired
Pending New<A>: Order pending acceptance
Pending Cancel<6>: Cancel pending
Pending Replace<E>: Modification pending

Text Field Values (58)

Common values for the Text field in Execution Reports:

EXCHANGE_UNAVAILABLE - the gateway could not confirm whether the order was applied (exchange unreachable, request timed out, or interrupted after the order may have been accepted). Reconcile the order’s state, or retry with the same ClOrdID. Maps to OrdRejReason “Other”
INTERNAL_ERROR - a reject from a healthy exchange that could not be mapped to a specific reason. The order was not applied, so it is safe to fix and resubmit. Maps to OrdRejReason “Other”
MARKET_ALREADY_CLOSED - maps to OrdRejReason “Exchange closed”
MARKET_INACTIVE - maps to OrdRejReason “Exchange closed”
MARKET_NOT_FOUND - maps to OrdRejReason “Unknown symbol”
SELF_CROSS_ATTEMPT - maps to ExecutionType “Canceled”
SELF_CROSS_ATTEMPT_PARTIALLY_FILLED - maps to ExecutionType “Canceled”
ORDER_ALREADY_EXISTS - maps to OrdRejReason “Duplicate order”
EXCEEDED_ORDER_GROUP_RISK_LIMIT - maps to OrdRejReason “Order exceeds limit”
INSUFFICIENT_BALANCE - maps to OrdRejReason “Order exceeds limit”
EXCHANGE_PAUSED - maps to OrdRejReason “Exchange closed”
TRADING_PAUSED - maps to OrdRejReason “Exchange closed”
INVALID_ORDER - maps to OrdRejReason “Unsupported order characteristic”
ORDER_GROUP_NOT_FOUND - maps to OrdRejReason “Unsupported order characteristic”
EXCEEDED_PER_MARKET_RISK_LIMIT - maps to OrdRejReason “Order exceeds limit”
EXCEEDED_SELL_POSITION_FLOOR - maps to OrdRejReason “Order exceeds limit”
EVENT_CONTRACT_DAILY_CAP_EXCEEDED - the customer account’s remaining event contract daily cap cannot cover this order. UseCapReservation (21032) sessions only. Maps to OrdRejReason “Order exceeds limit”
EVENT_CONTRACT_DAILY_CAP_NOT_FOUND - the customer account has no daily cap configured, so the cap lane cannot accept orders for it. UseCapReservation (21032) sessions only. Maps to OrdRejReason “Unknown account”
ORDER_AMEND_IN_PROGRESS - a previous amend for this order has not settled yet. UseCapReservation (21032) sessions only. Maps to CxlRejReason “Broker”
ORDER_ATTRIBUTES_MISMATCH - Symbol or Side does not match the resting order. UseCapReservation (21032) sessions only. Maps to CxlRejReason “Unknown order”
CUSTOMER_ACCOUNT_NOT_FOUND - maps to OrdRejReason “Unknown account”
PERMISSION_DENIED_FOR_CUSTOMER_ACCOUNT - maps to OrdRejReason “Unknown account”
FOK_INSUFFICIENT_VOLUME - maps to ExecutionType “Canceled”
POST_ONLY_CROSS - maps to ExecutionType “Canceled”
ORDER_GROUP_CANCEL - maps to ExecutionType “Canceled”
TAKER_CANCEL_FOR_SELF_TRADE_PREVENTION - maps to ExecutionType “Canceled”
MAKER_CANCEL_FOR_SELF_TRADE_PREVENTION - maps to ExecutionType “Canceled”
IMMEDIATE_OR_CANCELLED - maps to ExecutionType “Canceled”
EXPIRED - maps to OrdRejReason “Stale order” (RFQ quote had expired when the order arrived)

OrderCancelReject (35=9)

Exchange-side amend and cancel failures are returned as OrderCancelReject (35=9), not ExecutionReport.

Text (58)	CxlRejReason (102)
`INVALID_AMEND_QTY_FOR_ORDER`	Broker
`CANNOT_UPDATE_FILLED_ORDER`	Broker
`SELF_CROSS_ATTEMPT`	Invalid price increment
`ORDER_AMEND_IN_PROGRESS`	Broker
`ORDER_ATTRIBUTES_MISMATCH`	Unknown order
`EVENT_CONTRACT_DAILY_CAP_EXCEEDED`	Broker

Position and Fee Information

When ExecType=Trade:

Tag	Name	Description
704	LongQty	Net Yes position after trade as a decimal quantity
705	ShortQty	Net No position after trade as a decimal quantity
136	NoMiscFees	Number of fees
137	MiscFeeAmt	Total fees in dollars
138	MiscFeeCurr	Currency (USD)
139	MiscFeeType	Exchange Fees<4>
891	MiscFeeBasis	Fee unit (always ABSOLUTE<0>)
880	TrdMatchID	Unique trade identifier
1057	AggressorIndicator	Taker/Maker flag

Collateral Changes

Tag	Name	Description
1703	NoCollateralAmountChanges	Number of collateral changes
1704	CollateralAmountChange	Delta in dollars
1705	CollateralAmountType	BALANCE or PAYOUT

Collateral Return Breakdown

When Logon tag 21027 (SplitCollateralReturn) is set to Y, Execution Reports with ExecType=Trade include:

Tag	Name	Type	Description
21030	SingleMarketCollateralReturn	Decimal	Collateral freed from reducing/closing a position in a single market. In dollars. Only present when non-zero.
21031	RangedMarketCollateralReturn	Decimal	Collateral freed from MECNET/DIRECNET netting across a market group. In dollars. Only present when non-zero.

Both values are informational subsets of the BALANCE collateral change — they describe components within the total balance delta, not additional amounts.

Party Information

ExecutionReports independently include the customer account when applicable and at most one operator entry (Executing Trader<12>). Which operator appears depends on the report type: fills and other order-lifecycle reports (expiration, IOC cancellation, and similar) carry the operator captured at order creation, while Cancel and Cancel/Replace acknowledgements carry the operator sent on the acting request, falling back to the creation operator when that request carried none. When both a customer-account entry and an operator entry are present, the customer-account entry comes first.

Tag	Name	Description
453	NoPartyIDs	Number of parties: one or two
448	PartyID	Customer-account or operator identifier
452	PartyRole	Customer Account<24> or Executing Trader<12>
79	AllocAccount	Subaccount number (0-63)

Rejection Reasons (102)

Too late to cancel<0>: Order already filled
Unknown order<1>: Order not found
Other<99>: See Text field

Mass Cancel Request (35=q)

Cancel all orders for the trading session. Only available on KalshiNR (NewOrderMode) sessions.

Tag	Name	Description
11	ClOrdID	Unique request ID
530	MassCancelRequestType	Cancel for session<6>

Mass Cancel Report (35=r)

Response to mass cancel request.

Tag	Name	Description
11	ClOrdID	Request ID
37	OrderID	Operation ID
531	MassCancelResponse	Success<6> or Rejected<0>
532	MassCancelRejectReason	If rejected

Individual ExecutionReports will follow for each canceled order.

REST

CF Benchmarks REST

WebSockets

FIX

New Order Single (35=D)

FCM customer-account identifiers

Order Cancel/Replace Request (35=G)

Supported Modifications

Order Cancel Request (35=F)

Execution Report (35=8)

Order Status (39)

Order Rejection Reasons (103)

Execution Types (150)

Text Field Values (58)

OrderCancelReject (35=9)

Position and Fee Information

Collateral Changes

Collateral Return Breakdown

Party Information

Rejection Reasons (102)

Mass Cancel Request (35=q)

Mass Cancel Report (35=r)

​New Order Single (35=D)

​FCM customer-account identifiers

​Order Cancel/Replace Request (35=G)

​Supported Modifications

​Order Cancel Request (35=F)

​Execution Report (35=8)

​Order Status (39)

​Order Rejection Reasons (103)

​Execution Types (150)

​Text Field Values (58)

​OrderCancelReject (35=9)

​Position and Fee Information

​Collateral Changes

​Collateral Return Breakdown

​Party Information

​Rejection Reasons (102)

​Mass Cancel Request (35=q)

​Mass Cancel Report (35=r)

New Order Single (35=D)

FCM customer-account identifiers

Order Cancel/Replace Request (35=G)

Supported Modifications

Order Cancel Request (35=F)

Execution Report (35=8)

Order Status (39)

Order Rejection Reasons (103)

Execution Types (150)

Text Field Values (58)

OrderCancelReject (35=9)

Position and Fee Information

Collateral Changes

Collateral Return Breakdown

Party Information

Rejection Reasons (102)

Mass Cancel Request (35=q)

Mass Cancel Report (35=r)