Market Data Incremental Refresh

Incremental updates to the order book and trades following a Market Data Snapshot Full Refresh.

header

required

35=X

262 - MDReqID

string

required

Unique request identifier.

55 - Symbol

string

required

Asset Pair listed on the exchange.

268 - NoMDEntries

integer

required

Number of entries following. If several entries are present they need to be parsed in order (for example creation and deletion of an entry in the book can happen in the same message).

Hide repeating group

279 - MDUpdateAction

integer

required

Always first field in this repeating group.Possible values:

0 : New — Creation of an entry in the book
1 : Update — Update of a quantity for an entry in the book
2 : Delete — Removal of an entry from the subscribed depth (tag 271 greater than 0) or from the book entirely (tag 271=0, cancelled or filled)

269 - MDEntryType

integer

required

Possible values:

0 : Bid
1 : Offer
2 : Trade

278 - MDEntryID

string

required

Unique identifier for this market data entry. Corresponding to the OrderID for Level 3 subscription.

270 - MDEntryPx

float

required

Price of the market data entry.

271 - MDEntrySize

float

required

Volume represented by the market data entry.

273 - MDEntryTime

string

required

The time the entry was inserted or amended or deleted.

5060 - MDEntryTimestamp

string

High-precision event time for this market data update. Level 3 only. When present with 5273, 5060 is the time the update was generated; 5273 is the queue entry time. Sample format: 2026-02-03T10:24:34.650069468Z (ISO 8601, nanosecond fractional seconds, UTC).

5273 - MDEntryTimeQueue

string

Queue entry time: when the order entered the book at this price level. Level 3 only. For L3, orders at the same price are ordered by this tag. Sample format: 2026-02-03T10:24:29.175114502Z (ISO 8601, nanosecond fractional seconds, UTC).

40 - OrdType

char

The order type of the taker order.Possible values:

1 : market
2 : Limit

Condition: MDEntryType = Trade

2446 - AggressorSide

char

The side of the taker order.Possible values:

1 : Buy
2 : Sell

Condition: MDEntryType = Trade

5041 - ChecksumOrderBook

string

Checksum to verify the orderbook update. See Checksum article.Condition: MDEntryType = Bid or Offer

trailer

required

8=FIX.4.4|9=213|35=X|34=100|56=MYCOMPID|49=KRAKEN-MD|52=20230707-13:42:27.230|55=BTC/USD|262=1|268=2|279=2|269=1|278=O30300.7|270=30300.7|271=0.0|273=13:42:27.208|279=0|269=1|278=O31941.0|270=31941.0|271=0.0031746|273=20:40:00.455|10=112|