Order Cancel Messages

Order cancel request and reject message formats and fields.

Order Cancel Request

Submit cancel requests with MsgType (35) set to F. Orders can be canceled at any point by referencing the ClOrdID (11) used when submitting the order. See Execution Report - Canceled for the cancel confirmation response.

Message Format – Outgoing Message

Standard FIX Fields

Tag	Field	When to Include	Notes
8	BeginString	Always	Standard FIX header
9	BodyLength	Always	Standard FIX header
35	MsgType	Always	F (Order Cancel Request)
49	SenderCompID	Always	Standard FIX header
56	TargetCompID	Always	Standard FIX header
34	MsgSeqNum	Always	Standard FIX header
52	SendingTime	Always	Standard FIX header

Standard FIX Trailer

Tag	Field	When to Include	Notes
10	CheckSum	Always

Cancel Request Fields

Required

Tag	Field	When to Include	Notes
41	OrigClOrdID	Always	ClOrdID of the original order to cancel
11	ClOrdID	Always	New client order ID for this cancel request (a-z, A-Z, 0-9, ., -, _, $, :)
1	Account	Always
109	ClientID	Always
55	Symbol	Always	Currency pair
167	SecurityType	Always	Must be FOR
54	Side	Always	1 = Buy, 2 = Sell
60	TransactTime	Always

Conditional

Tag	Field	When to Include	Notes
38	OrderQty	Limit and market sell orders	Base quantity
152	CashOrderQty	Market buy orders	Fiat notional

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Order Cancel Reject

If a cancel request cannot be processed, Paxos returns an Order Cancel Reject with MsgType (35) set to 9 and CxlRejReason (102) populated.

Message Format – Response Message

Standard FIX Fields

Tag	Field	When Present	Notes
8	BeginString	Always	Standard FIX header
9	BodyLength	Always	Standard FIX header
35	MsgType	Always	9 (Order Cancel Reject)
49	SenderCompID	Always	Standard FIX header
56	TargetCompID	Always	Standard FIX header
34	MsgSeqNum	Always	Standard FIX header
52	SendingTime	Always	Standard FIX header

Standard FIX Trailer

Tag	Field	When Present	Notes
10	CheckSum	Always

Cancel Reject Fields

Always Present

Tag	Field	When Present	Notes
434	CxlRejResponseTo	Always	1 = Order Cancel Request
11	ClOrdID	Always	ClOrdID from the cancel request
39	OrdStatus	Always	Current order status
41	OrigClOrdID	Always	Original order ClOrdID
37	OrderID	Always
1	Account	Always
102	CxlRejReason	Always	See rejection reasons below

Rejection Reasons – CxlRejReason (102)

Value	Meaning	When
0	Too late to cancel	Order is already filled, cancelled, or rejected
1	Unknown order	Order not found or invalid client order identifier
2	Broker option	General rejection (e.g., too early to cancel, invalid wallet)
3	Already pending cancel	A cancel request is already being processed for this order
99	Other	Market is unavailable