Exchange FIX Order Entry Messages 5.0

About this API:

• Baseline: FIX 5.0 SP2 specification.
• Environments: Production, Sandbox

:::info Environment URLs

• Production: VAR::FIX_URL_PROD_ORDER_ENTRY_FIVE
  
• Sandbox: VAR::FIX_URL_SAND_ORDER_ENTRY_FIVE :::

FIX5 Resets Saturdays at 1PM ET

FIX5 Order Entry and Market Data customers will be logged out every Saturday at 1PM ET (6PM UTC).

Components

Standard Header

Fields that go at the beginning of every message. This exists for all messages sent and received.

Tag	Name	Type	Required	Description
8	BeginString	String	Y	Must be set to FIXT.1.1 and be the first field in the message. (Since FIX version 5.0 this field now represents the session version. The application version gets specified in Logon message’s DefaultApplVerID (1137) tag.)
9	BodyLength	Int	Y	Message length in bytes up to the checksum field (tags after BodyLength (9) and before Checksum (10)). This must be the second field in message.
35	MsgType	String	Y	The type of message proceeding the header, must be the third field in the message. Supported values include: Admin Messages A = Logon 0 = Heartbeat 1 = TestRequest 3 = Reject 5 = Logout Application Messages D = NewOrderSingle F = OrderCancelRequest G = OrderCancelReplaceRequest H = OrderStatusRequest j = BusinessMessageReject 8 = ExecutionReport 9 = OrderCancelReject U4 = OrderCancelBatch U5 = OrderCancelBatchReject U6 = NewOrderBatch U7 = NewOrderBatchReject
49	SenderCompID	String	Y	Client API key (on messages from the client).
56	TargetCompID	String	Y	Must be Coinbase (on messages from client).
34	MsgSeqNum	Int	Y	Monotonically increasing sequence number of the message.
43	PossDupFlag	Boolean	C	Indicates that the message was sent in response to a ResendRequest. - Y - Sent in response to ResendRequest. Should be ignored unless message was not previously processed - N or null - Normal transmission
52	SendingTime	UTCTimestamp	Y	UTC time that the order was sent down to millisecond resolution in the format YYYYMMDD-HH:MM:SS.sss
83	RptSeq	Int	C	The feed sequence number of the message corresponding to the RptSeq in FIX 5.0 Market Data

Standard Trailer

Fields that go at the end of every message.

Tag	Name	Type	Required	Description
10	CheckSum	String	Y	Three byte checksum calculated by summing every byte in the message up to and not including the checksum field itself. This value is then moduloed by 256 and written with prefixed 0s (if necessary) to meet the 3 byte requirement.

Administrative

Logon (35=A)

First message that is required immediately upon connection to authenticate the connection. MsgSeqNum always equals 1 (34=1) on this message in both directions.

Tag	Name	Type	Required	Description
98	EncryptMethod	Int	N	Must be 0 (None)
108	HeartBtInt	Int	O	Must be ≤ 30 (secs). Server sends Test Request if client messages are not received in approximately (HeartBtInt x 1.5) seconds. Server terminates session if client messages are not received in approximately (HeartBtInt x 2) seconds. Defaults to 10 seconds if not value provided.
141	ResetSeqNumFlag	Boolean	Y	Resets the sequence number. Defaults to Y. Sequence numbers from Customer => Coinbase always get reset after a disconnect. Sequence numbers from Coinbase => Customer are reset after a disconnect if either of these are true: 1. ResetSeqNumFlag not set 2. ResetSeqNumFlag = Y 3. Customer was not logged on using same API key more than 1 day. The max possible MsgSeqNum is 2147483647 and customers are responsible for resetting their sessions to avoid breaching this limit.
553	Username	String	Y	Client API Key.
554	Password	String	Y	Passphrase for Client API key.
95	RawDataLength	Int	Y	Number of bytes in RawData field.
96	RawData	String	Y	Client message signature (see Signing a message)
1137	DefaultApplVerID	String	Y	Contains the version of the FIX protocol the exchange uses. Only FIX50SP2 is supported. Supported values: 9 = FIX50SP2
8001	DefaultSelfTradePreventionStrategy	Char	N	The default SelfTradePreventionStrategy applied to all orders sent on the session unless overridden on a per order basis using the SelfTradeType (7928) in the order request message. The following values specify what to do when two orders submitted by the same portfolio attempt to match: N = Cancel aggressing order Q = Cancel both orders Default if not specified is Cancel both orders (Q).
8013	CancelOrdersOnDisconnect	Char	N	S = Cancel all session orders on disconnect Y = Cancel all profile orders on disconnect (recommended)
9406	DropCopyFlag	Char	N	N = Normal order-entry session Y = Drop Copy Session that only returns fills (Execution Report - Filled and Execution Report - Partially Filled)

FIX 5.0 Logon Details:

FIX 5.0 is separated into two different layers an application layer and a session layer. The application layer is version 5.0 and the session layer is version T1.1.

• For all LOGON messages use MsgSeqNum 1, set 553 Username to the api key, and only create one session per API Key.
• The begin string will use the session layer version 8=FIXT.1.1
• The application layer version will be specified on the DefaultAppVerID which is tag 1137. This should be set to 9 (This represents version 5.0).
• Sequence numbers must not include leading zeros (e.g., “0001” is invalid, whereas “1” is valid). Using sequence numbers with leading zeros will result in an invalid signature error.
• Fractional seconds must be specified using exactly three digits. For example, 52=20230822-20:43:30.000 is supported, while both 52=20230822-20:43:30 (no fractional seconds) and 52=20230822-20:43:30.123456789 (excessive precision) will result in a signature calculation error.

The Logon message sent by the client must be signed for security. The signing method is shown below. The prehash string is the following fields joined:

SendingTime, MsgType, MsgSeqNum, SenderCompID (API KEY), TargetCompID, Passphrase..

There is no trailing separator. The RawData field should be a base64 encoding of the HMAC signature.

"""Example Python QuickFIX Application.py logon message setup"""
class Application(fix.Application):
    PASSPHRASE = [ENTER PASSPHRASE]
    API_KEY = [ENTER API_KEY]
    SECRET = [ENTER SECRET]

"""Setup the Logon message & call sign function"""
def toAdmin(self, message, sessionID):
    rawData = self.sign(message.getHeader().getField(52), message.getHeader().getField(35),
                                message.getHeader().getField(34), self.API_KEY, message.getHeader().getField(56),
                                self.PASSPHRASE)
    message.setField(fix.StringField(554, self.PASSPHRASE))
    message.setField(fix.StringField(96, rawData))
    message.setField(fix.StringField(8013, "Y"))
    message.setField(fix.StringField(553, self.API_KEY))
    message.setField(fix.IntField(95, len(rawData.encode('utf-8'))))

"""Create base64 encoded signature"""
def sign(self, timestamp, msg_type, seq_num, api_key, target_comp_id, passphrase):
    message = '\x01'.join([timestamp, msg_type, seq_num, api_key, target_comp_id, passphrase]).encode("utf-8")
    hmac_key = base64.b64decode(self.SECRET)
    signature = hmac.new(hmac_key, message, hashlib.sha256)
    sign_b64 = base64.b64encode(signature.digest()).decode()
    return sign_b64

To establish multiple FIX connections, a unique API key must be generated for each connection. A maximum of VAR::FIX_MAX_CONNECTIONS_PER_PROFILE connections is allowed per profile. Reusing a single API key for simultaneous connections will result in an error.

FIX 5.0 How to resume a session:

To do a full resume of all data from the last session:

After session disconnect:

• Client LOGON with MsgSeqNum 1 and 141 (ResetSeqNumFlag) = N
• Server responds with a LOGON with MsgSeqNum 1 followed by a Sequence Reset with 36 (NewSeqNo) that the server sends just to communicate the last seqnum from the last session
• Client sends a Resend Request as MsgSeqNum 2 asking for 7 (BeginSeqNo) = 2 and 16 (EndSeqNo) = NewSeqNo from above OR
• If NewSeqNo > 1000 ask for 7 (BeginSeqNo) = 2 and 16 (EndSeqNo) = 1000 with an intent to page all of the Sequence Numbers in blocks of 1000.
  • so the next block would be 7 (BeginSeqNo) = 1001 to 16 (EndSeqNo) = 1999 or NewSeqNo if less than 2000
• We don’t replay admin messages or messages older than 1 hour so for any gaps we send a Sequence Reset
• Wait for completed resend before requesting the next page

Heartbeat (35=0)

Sent at a prearranged interval from both sides to indicate liveness of the connections and used in response to a TestRequest message (35=1).

Tag	Name	Type	Required	Description
112	TestReqID	String	C	Conditionally required when the heartbeat message is sent in response to a TestRequest (35=1) message.

TestRequest (35=1)

This message forces the other side of the connection to send a Heartbeat message (35=0) with the TestReqID (tag 112) populated with the same value provided on this message.

Tag	Name	Type	Required	Description
112	TestReqID	String	Y	A unique identifier used to track the response to a test request.

ResendRequest (35=2)

Sent by the customer to Coinbase to request the retransmission of a range of messages on a given FIX session.

The Coinbase FIX gateway keeps a 4 hour history of messages sent to customers:

• Administrative messages are always replaced by SequenceReset-GapFill messages during retransmission.
• Older non-administrative messages are also replaced by SequenceReset-GapFill messages.
• Retransmitted messages, including SequenceReset-GapFill messages, have PossDupFlag enabled (43=Y) in the header.

The maximum allowed range per request is 1000 messages and only 1 ResendRequest can be processed at a time per session.

Tag	Name	Type	Required	Description
7	BeginSeqNo	Int	Y	Sequence number of first message in range to be resent. Must be >= 1
16	EndSeqNo	Int	Y	Sequence number of last message in range to be resent. Must be >= 1 and >= BeginSeqNo

SequenceReset (35=4)

Used to skip messages during retransmission. Coinbase only supports “GapFill” mode where GapFillFlag is always true.

Coinbase sends SequenceReset-GapFill messages to customers with or without PossDupFlag (43) in the header:

• Without PossDupFlag: Coinbase sends immediately after logon to reset the Coinbase sequence number to the next outbound sequence number stored for the session.
• With PossDupFlag=Y: Coinbase sends in response to a ResendRequest for all administrative messages, irrespective of time sent, as well as non-administrative messages older than 4 hours.

Tag	Name	Type	Required	Description
123	GapFillFlag	Boolean	Y	Always true (123=Y)
36	NewSeqNo	Int	Y	Must be > 1

Reject (35=3)

A session level reject message sent when the FIX session can’t process a message.

Tag	Name	Type	Required	Description
45	RefSeqNum	Int	Y	The MsgSeqNum of the referenced message that was rejected.
371	RefTagID	Int	N	The tag number of the FIX field referenced in the reject.
372	RegMsgType	String	N	The MsgType of the FIX message referenced in the reject.
373	SessionRejectReason	Int	N	A code to quickly identify common reasons for a reject. Supported values: 0 = Invalid Tag Number 1 = Required Tag Missing 2 = Tag not defined for this message type 3 = Undefined tag 4 = Tag specified without a value 5 = Value is incorrect (out of range) for this tag 6 = Incorrect data format for value 8 = Signature problem 9 = CompID problem 10 = SendingTime Accuracy Problem 11 = Invalid MsgType 13 = Tag appears more than once 14 = Tag specified out of required order 15 = Repeating group fields out of order 16 = Incorrect NumInGroup count for repeating group 17 = Non “Data” value includes field delimiter (<SOH> character) 18 = Invalid/Unsupported Application Version 99 = Other
58	Text	String	N	A message explaining why the message was rejected.

Logout (35=5)

Sent by either side to initiate session termination. The side which receives this message first should reply with the same message type to confirm session termination.

Tag	Name	Type	Required	Description
58	Text	String	N	Description of the disconnection reason.

Trading

NewOrderSingle (35=D)

Used to submit a new spot order to the Exchange matching engine.

For more information on specific order variants see Iceberg Orders, TPSL Orders, and Limit With Funds Orders.

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	An identifier specified by the sender to uniquely identify other messages correlating to this request. It must be a variant 1 UUIDv4 that follows the standard format. This means all lowercase and hyphens that group the characters in sequences of 8, 4, 4, 4, 12 (e.g. 1985ca2d-61ef-49f1-bfce-6c39d8462914). Failure to follow this formatting will result in a reject. This shouldn’t match the ClOrdID of any open orders.
18	ExecInst	Char	N	The execution instruction flags for the order. Supported values: A = Add Liquidity Only (Post Only)
38	OrderQty	Decimal	C	The amount of the base asset to be transacted. Required except unless CashOrderQty is specified.
1138	DisplayQty	Decimal	C	Maximum size within an order to be displayed. Must be > 10% of OrderQty
152	CashOrderQty	Decimal	C	Order size in quote units (e.g., USD) (Market or Limit order only).
40	OrdType	Char	Y	The type of order for the request which can be. Supported values: 1 = Market 2 = Limit 4 = Stop Limit O = Take Profit Stop Loss
44	Price	Decimal	C	The limit price for limit orders of the quote asset. The decimal precision must fall within the requirements for each market, see the REST API for precision and decimal limits.
54	Side	Char	Y	Side of the order. Supported values: 1 = Buy 2 = Sell
55	Symbol	String	Y	Symbol of the instrument being traded (e.g. BTC-USDC)
59	TimeInForce	Char	Y	Specifies how long the order remains in effect. Supported values: 1 = Good Till Cancel (GTC) 3 = Immediate Or Cancel (IOC) 4 = Fill Or Kill (FOK) 6 = Good Till Date (GTD)
126	ExpireTime	UTCTimestamp	C	Required when TimeInForce (59) is set to GTD (6). Specifies the time when a GTD order expires. Required for GTD orders and should not be set for other orders. The order expires within one second after the specified time.
99	StopPx	Decimal	C	Specifies the quote price at which the order activates for Stop Limit order types (40=4)
1109	TriggerPriceDirection	Char	N	Supported values: U = Trigger if market price goes UP to or through StopPx (default if StopPx is greater than current market price) D = Trigger if market price goes DOWN to or through StopPx (default if StopPx is less than current market price) For stop-limit orders, this field is optional but recommended.
7928	SelfTradeType	Char	N	The following values specify what to do when two orders are submitted by the same user attempt to match: D = Decrement and Cancel (default if not specified) O = Cancel Oldest (resting order) N = Cancel Newest (aggressing order) B = Cancel Both

NewOrderBatch (35=U6)

Used to submit new spot orders to the Exchange matching engine. Clients should use this message to submit multiple orders to the Exchange matching engine at the same time. Currently, all the orders submitted in a batch must be for the same symbol.

Tag	Name	Type	Required	Description
8014	BatchID	UUID	Y	An identifier specified by the sender to uniquely identify other messages correlating to this request. It must be a variant 1 UUIDv4 that follows the standard format. This means all lowercase and hyphens that group the characters in sequences of 8, 4, 4, 4, 12 (e.g. 1985ca2d-61ef-49f1-bfce-6c39d8462914). Failure to follow this formatting will result in a reject.
73	NoOrders	Int	Y	Number of orders in the request.
=>11	ClOrdID	UUID	Y	An identifier specified by the sender to uniquely identify other messages correlating to this request. It must be a variant 1 UUIDv4 that follows the standard format. This means all lowercase and hyphens that group the characters in sequences of 8, 4, 4, 4, 12 (e.g. 1985ca2d-61ef-49f1-bfce-6c39d8462914). Failure to follow this formatting will result in a reject. This shouldn’t match the ClOrdID of any open orders. Additionally, it shouldn’t match any other ClOrdIDs in this batch.
=>18	ExecInst	Char	N	The execution instruction flags for the order. Supported values: A = Add Liquidity Only (Post Only)
=>38	OrderQty	Decimal	C	The amount of the base asset to be transacted. Required except for market orders with CashOrderQty specified.
=>152	CashOrderQty	Decimal	C	The order size in quote units (e.g., USD) (Market order only).
=>40	OrdType	Char	Y	The type of order for the request which can be. Supported values: 1 = Market 2 = Limit 4 = Stop Limit
=>44	Price	Decimal	C	The limit price for limit orders of the quote asset. The decimal precision must fall within the requirements for each market, see the REST API for precision and decimal limits.
=>54	Side	Char	Y	Side of the order. Supported values: 1 = Buy 2 = Sell
=>55	Symbol	String	Y	Symbol of the instrument being traded (e.g. BTC-USDC)
=>59	TimeInForce	Char	Y	Specifies how long the order remains in effect. Supported values: 1 = Good Till Cancel (GTC) 3 = Immediate Or Cancel (IOC) 4 = Fill Or Kill (FOK) 6 = Good Till Date (GTD)
=>126	ExpireTime	UTCTimestamp	C	Required when TimeInForce (59) is set to GTD (6). Specifies the time when a GTD order expires. Required for GTD orders and should not be set for other orders. The order expires within one second after the specified time.
=>99	StopPx	Decimal	C	Specifies the quote price at which the order activates for Stop Limit order types (40=4).
=>7928	SelfTradeType	Char	N	Represents type of cancel instruction when two orders submitted by the same user attempt to match. Supported values: D=Decrement and Cancel (default if not specified) O=Cancel Oldest (resting order) N=Cancel Newest (aggressing order) B=Cancel Both

NewOrderBatchReject (35=U7)

This message is sent by Coinbase Exchange back to clients when all the orders in a New Order Batch (35=U6) Request are rejected. When only some of the orders are rejected, Execution Report - Rejected messages are sent out for each of the orders individually.

Tag	Name	Type	Required	Description
8014	BatchID	UUID	Y	Client-supplied ID identifying the new order batch request.
58	Text	String	Y	The reason the batch of orders was rejected.

OrderCancelRequest (35=F)

Coinbase Recommends

For order cancel requests, Coinbase recommends that you use the same FIX connection that was used to place the order.

Used to cancel an order that is still live on the Exchange matching engine.

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	An identifier specified by the sender to uniquely identify other messages correlating to this request. It must be a variant 1 UUIDv4 that follows the standard format. This means all lowercase and hyphens that group the characters in sequences of 8, 4, 4, 4, 12 (e.g. 1985ca2d-61ef-49f1-bfce-6c39d8462914). Failure to follow this formatting will result in a reject.
37	OrderID	UUID	Y	The exchange order ID of the order to be canceled.
41	OrigClOrdID	UUID	Y	The client order ID of the order to be canceled. At least one of OrigClOrdID or OrderID must be specified.
55	Symbol	String	Y	Must match the message that the OrigClOrdID references.

OrderCancelReject (35=9)

This message is sent by Coinbase Exchange back to clients to reflect that an order could not be canceled on the matching engine in the following situations:

• When an Order Cancel Request (35=F) is rejected (CxlRejResponseTo 434=1)
• When an Order Cancel/Replace Request (35=G) is rejected (CxlRejResponseTo 434=2)
• When an Order Cancel Batch (35=U4) is partially rejected (CxlRejResponseTo 434=1)

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	Echoed back from the client request.
37	OrderID	UUID	C	Echoed back from the client request.
41	OrigClOrdID	UUID	Y	Echoed back from the client request.
58	Text	String	N	Description of why the order could not be canceled.
39	OrdStatus	Char	Y	Always: 8 = Rejected
102	CxlRejReason	Int	N	Supported values: 1 = Unknown Order 2 = Broker
434	CxlRejResponseTo	Char	Y	Supported values: 1 = Order Cancel Request 2 = Order Cancel/Replace Request

OrderCancelBatch (35=U4)

Coinbase Recommends

For order cancel batch requests, Coinbase recommends that you use the same FIX connection that was used to place the order.

Clients should use this message to cancel multiple orders on the Exchange matching engine at the same time. Currently, all the orders canceled in a batch must be for the same symbol.

Tag	Name	Type	Required	Description
8014	BatchID	UUID	Y	Client-supplied ID identifying the order cancel batch request.
73	NoOrders	Int	Y	Number of orders in the request.
=>11	ClOrdID	UUID	Y	Client-supplied ID identifying the order cancel request.
=>37	OrderID	UUID	Y	The exchange order ID of the order to be canceled.
=>41	OrigClOrdID	UUID	Y	The client order ID of the order to be canceled. At least one of OrigClOrdID or OrderID must be specified.
=>55	Symbol	String	Y	Must match the message that the OrigClOrdID references.

OrderCancelBatchReject (35=U5)

This message is sent by Coinbase Exchange back to clients when all the orders in an Order Cancel Batch (35=U4) Request could not be canceled. When only some of the orders could not be canceled, Order Cancel Reject (35=9) messages are sent out for the orders individually.

Tag	Name	Type	Required	Description
8014	BatchID	UUID	Y	Client-supplied ID identifying the order cancel batch request.
58	Text	String	N	The reason the order cancel batch request was rejected.

OrderCancelReplaceRequest (35=G)

Use Original FIX Connection

You must send order cancel replace requests via the same FIX connection through which the original order was placed.

Clients should use this message to modify a single order on the Exchange matching engine (only order price and order size can be modified). If order quantity is increased or order price is modified, queue priority is lost. Queue priority is maintained when order quantity is decreased.

Modified orders share the same exchange OrderID(37) as the parent order.

Orders are modified with “in-flight mitigation” - i.e. any partially filled quantity on the parent order is carried over to the child order and is reflected in the new order’s remaining quantity LeavesQty(151).

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	The client order ID of the new order (that will replace an existing order). This shouldn’t match the ClOrdID of any open orders.
37	OrderID	UUID	Y	An identifier matching the OrderID from the NewOrderSingle, NewOrderBatch, or OrderCancelReplaceRequest that this request applies to.
41	OrigClOrdID	String	Y	An identifier matching the ClOrdID from the NewOrderSingle, NewOrderBatch, or OrderCancelReplaceRequest that this request applies to.
38	OrderQty	Decimal	Y	The new amount of the base asset to be transacted.
44	Price	Decimal	Y	The new desired limit price of the order.
55	Symbol	String	Y	Must match the symbol on the message that the OrigClOrdID references.
40	OrdType	Char	Y	Must be: 2 = Limit

OrderMassCancelRequest (35=q)

Sent by customer to Coinbase to request mass cancellation of all orders on a FIX session previously submitted by customer.

:::info At this time, only mass cancels for Trading Sessions are supported (530=6). :::

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	Identifier of the Mass Cancel request (not the order ID to be canceled)
530	MassCancelRequestType	Char	Y	Type of orders to be canceled: 6 - Cancel Orders for a Trading Session
60	TransactTime	UTCTimestamp	Y	Request timestamp

not guaranteed Like Cancel on Disconnect, orders that were sent by the customer, but not yet acknowledged by the exchange, are not guaranteed to be canceled.

OrderMassCancelReport (35=r)

Sent by Coinbase to the customer as an acknowledgement of an Order Mass Cancel Request for processing or a rejection of the request.

Receipt of a successful Order Mass Cancel Report does not imply that orders were canceled until “Execution Report - Canceled” is sent to customer.

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	ID echoed from the Order Mass Cancel Request
530	MassCancelRequestType	Char	Y	Echoed from the Order Mass Cancel Request: 6 - Cancel Orders for a Trading Session
531	MassCancelResponse	Char	Y	If the Order Mass Cancel Request was rejected: 0 - Request Rejected If successful, echoed from the request: 3 - Cancel Orders for a Product on Profile 6 - Cancel Orders for a Trading Session 7 - Cancel All Orders on Profile
58	Text	String	N	A message explaining why the request was rejected

ExecutionReport (35=8)

This message is sent by Coinbase Exchange back to clients to reflect changes to an order’s state (accepted, replaced, restated, partially filled, filled, expired, or canceled).

Tag	Name	Type	Required	Description
11	ClOrdID	UUID	Y	The client order ID of the (new) order.
37	OrderID	UUID	Y	A unique identifier assigned by the exchange for the order.
41	OrigClOrdID	String	C	The client order ID of the parent order for Order Cancel/Replace Requests.
6	AvgPx	Decimal	C	The volume-weighted average price of all fills on the order.
14	CumQty	Decimal	C	The cumulative base quantity (e.g. in BTC) filled on the order.
151	LeavesQty	Decimal	C	The remaining base quantity (e.g. in BTC) on the order. Not sent for market orders that were sent using CashOrderQty.
17	ExecID	UUID	Y	ID identifying this execution report.
39	OrdStatus	Char	Y	Supported values: 0 = New 1 = Partially Filled 2 = Filled 4 = Canceled 5 = Replaced 8 = Rejected C = Expired (For IOC expirations)
150	ExecType	Char	Y	Supported values: 0 = New 4 = Canceled 5 = Replaced 8 = Rejected C = Expired (For IOC expirations) D = Restated (in cases where orders are partially canceled unsolicited due to self-trade prevention) F = Trade I = Order Status (in response to Order Status Requests)
55	Symbol	String	Y	The symbol of the order (e.g. BTC-USD).
54	Side	Char	C	Supported values: 1 = Buy 2 = Sell
40	OrdType	Char	C	Supported values: 1 = Market 2 = Limit 4 = Stop Limit
32	LastQty	Char	C	The base quantity (e.g. in BTC) of the most recent fill on the order when ExecType is F (Trade).
31	LastPx	Decimal	C	The price of the most recent fill on the order when ExecType is F (Trade).
44	Price	Decimal	C	The limit price of the order.
38	OrderQty	Decimal	C	The base quantity (e.g. in BTC) of the order.
1138	DisplayQty	Decimal	C	Maximum size within an order to be displayed. Must be > 10% of OrderQty
198	SecondaryOrderID	String	C	Assigned by party that accepts the order. Can be used to provide the OrderID (37) used by an exchange or executing system.
152	CashOrderQty	Decimal	C	The quote quantity (e.g. in USD) of the order. For market orders that were submitted using CashOrderQty instead of OrderQty, this is the remaining quote quantity of the order.
58	Text	String	N	Description of why the order was rejected, canceled, or expired.
60	TransactTime	UTCTimestamp	Y	Matching engine timestamp.
103	OrdRejReason	Int	N	Supported values: 0 = Broker 1 = Unknown Symbol 5 = Unknown Order
378	ExecRestatementReason	Int	N	Supported values: 5 = Partial Decline of OrderQty (in cases where orders are partially canceled unsolicited due to self-trade prevention).
1003	TradeID	String	C	Trade ID for a given fill used for reporting.
1057	AggressorIndicator	Boolean	C	Supported values: Y = Taker (if aggressor or auction trade) N = Maker
59	TimeInForce	Char	C	Supported values: 1 = GTC 3 = IOC 4 = FOK 6 = GTD
99	StopPx	Decimal	C	For stop-limit orders, the stop price of the order.
1109	TriggerPriceDirection	Char	N	For stop-limit orders. Supported values: U = Trigger if market price goes UP to or through StopPx D = Trigger if market price goes DOWN to or through StopPx
18	ExecInst	Char	N	Supported values: A = Add Liquidity Only.
7928	SelfTradeType	Char	N	Supported values: D = Decrement and Cancel (default if not specified) O = Cancel Oldest (resting order) N = Cancel Newest (aggressing order) B = Cancel Both
126	ExpireTime	UTCTimestamp	C	Timestamp at which a GTD order would expire.
136	NoMiscFees	Int	C	Repeating group for fees charged. Always 1 on an order partial fill or fill.
=>137	MiscFeeAmt	Decimal	C	See MiscFeeBasis.
=>138	MiscFeeCurr	String	C	The currency that the fee is charged in.
=>139	MiscFeeType	String	C	Always: 4 = Exchange Fees.
=>891	MiscFeeBasis	Int	C	Supported values: 0 = Absolute (MiscFeeAmt is in MiscFeeCurr terms) 2 = Percentage (MiscFeeAmt should be multiplied by the fill quantity in MiscFeeCurr terms to calculate the fee in MiscFeeCurr terms)

BusinessMessageReject (35=j)

An application level reject message sent when the FIX session can’t process a message.

Tag	Name	Type	Required	Description
45	RefSeqNum	Int	N	The MsgSeqNum of the referenced message that was rejected.
372	RefMsgType	Int	Y	The message type that this reject message applies to. Supported values include: Admin Messages A = Logon 0 = Heartbeat 1 = TestRequest 3 = Reject 5 = Logout Application Messages D = NewOrderSingle F = OrderCancelRequest G = OrderCancelReplaceRequest H = OrderStatusRequest j = BusinessMessageReject 8 = ExecutionReport 9 = OrderCancelReject U4 = OrderCancelBatch U5 = OrderCancelBatchReject U6 = NewOrderBatch U7 = NewOrderBatchReject
379	BusinessRejectRefID	String	N	The ClOrdID, OrderID, BatchID, or other identifying ID on the failed request.
380	BusinessRejectReason	Int	N	A code to quickly identify common reasons for a reject. Supported values include: 1 = Other 2 = Unsupported Message Type
58	Text	String	N	A message explaining why the message was rejected.

RFQ

Quote Request (R)

A Quote Request (R) is the start of the RFQ process. Coinbase sends a Quote Request to Liquidity Providers (LPs) on behalf of a customer looking to participate in an RFQ trade. LPs respond to a Quote Request with a Quote.

Tag	Name	Type	Required	Notes
131	QuoteReqID	UUID	Y	Unique identifier for RFQ
146	NoRelatedSym	NumInGroup	Y	Always 1
55	Symbol	String32	Y	Example: BTC-AVAX
38	OrderQty	Float64	Y	The quantity the customer is looking to trade via RFQ
62	ValidUntilTime	UTCTimestamp	Y	The time by which quotes must be submitted for the RFQ
126	ExpireTime	UTCTimestamp	Y	The time by which the RFQ expires if there is no match
136	NoMiscFees	NumInGroup	Y	Always 1
137	MiscFeeAmt	Float64	Y	Fee as a percentage that Liquidity Providers are charged on a winning Quote. The fee is charged in the currency the LP receives (e.g., in BTC if LP is buying BTC-AVAX, or in AVAX if LP is selling BTC-AVAX). Example: 0.0005 (5 bps)
139	MiscFeeType	Int32	Y	Always 4 = Exchange Fees
891	MiscFeeBasis	Int32	Y	Always 2 = Percentage
528	OrderCapacity	Char	Y	A = Agency (default) C = Corporate

Quote (S)

Quote (S) messages are submitted by Liquidity Providers (LP) in response to a Quote Request in order to participate in the competitive RFQ auction.

Quotes can be submitted as either a one-way or two-way quote, and must be received by the ValidUntilTime (62) specified in the Quote Request. Only one side is traded if the Liquidity Provider wins the RFQ.

Tag	Name	Type	Required	Notes
131	QuoteReqID	UUID	Y	Unique identifier for RFQ echoed from Quote Request
117	QuoteID	UUID	Y	Unique identifier for Quote specified by Liquidity Provider
55	Symbol	String32	Y	Example: BTC-AVAX
132	BidPx	Float64	C	Required if submitting bid
133	OfferPx	Float64	C	Required if submitting offer
134	BidSize	String32	C	Required if submitting bid. Must match OrderQty (38) from Quote Request
135	OfferSize	String32	C	Required if submitting offer. Must match OrderQty (38) from Quote Request

Quote Status Report (AI)

Quote Status Reports are sent to Liquidity Providers with Quote statuses and expired Quote Requests.

• If the Quote is rejected b/c validation checks failed or it was sent too late, the response to the quoter is 297=5 (QuoteStatus = Rejected).
• If the Quote is accepted and eligible to participate in an RFQ auction, the response to the quoter is 297=16 (QuoteStatus = Active).
• If the Quote is accepted but not selected for execution, the response to the quoter is 297=17 (QuoteStatus = Canceled).
• If the Quote is accepted and selected for execution, the response to the quoter is 297=19 (QuoteStatus = Pending End Trade), followed by Execution Report - Filled.
• If the Quote Request is unmatched by ExpireTime (126) on the Quote Request, 297=7 (QuoteStatus = Expired) is broadcast to all LPs.

Tag	Name	Type	Required	Notes
131	QuoteReqID	UUID	Y	Unique identifier for RFQ echoed from Quote Request
117	QuoteID	UUID	C	Unique identifier for Quote specified unless QuoteStatus = Expired (297=7)
55	Symbol	String32	Y	Example: BTC-AVAX
54	Side	Char	C	Buy: 54=1, Sell: 54=2 Specified if QuoteStatus=Pending End Trade (297=19)
38	OrderQty	Float64	Y	Echoed from Quote Request
132	BidPx	Float64	C	Echoed from Quote
133	OfferPx	Float64	C	Echoed from Quote
134	BidSize	Float64	C	Echoed from Quote
135	OfferSize	Float64	C	Echoed from Quote
62	ValidUntilTime	UTCTimestamp	Y	Echoed from Quote Request
126	ExpireTime	UTCTimestamp	Y	Echoed from Quote Request
297	QuoteStatus	Int32	Y	5 = Rejected: Quote failed validation checks or was sent too late 7 = Expired: Quote Request expired w/no match 16 = Active: Quote was acknowledged 17 = Canceled: Quote not selected b/c LP did not win auction or had insufficient funds 19 = Pending End Trade: Quote selected for execution
58	Text	String	C	Reason the Quote was rejected if QuoteStatus=5 Can also be “Unable to hold funds” if QuoteStatus=17

RFQ Request (AH)

Request For Quote (RFQ) allows Liquidity Providers to respond to, and interact with, real-time RFQ requests. The RFQ process begins with Quote Request (R).

RFQ is enabled for users who have been approved by Coinbase as a Liquidity Provider. Once approved, clients must send an RFQ Request message (35=AH) after each successful Logon message (35=A) for any session in which they are interested in receiving Quote Requests.

Tag	Name	Type	Required	Notes
644	RFQReqID	UUID	Y	Unique identifier for RFQ Request

Not receiving a response is expected and indicative of a successful RFQ Request.