> ## Documentation Index
> Fetch the complete documentation index at: https://docs.kraken.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Market Data Snapshot Full Refresh

> Full order book snapshot via FIX

<div className="api-banner">
  <span className="api-protocol fix">FIX</span>
  <span className="api-detail">session: market-data</span>
  <span className="api-tag">35=W</span>
</div>

The initial response to a valid [Market Data Request](/exchange/api-reference/unified-fix/mdr) containing the full order book snapshot.

***

<ResponseField name="header" type="" required>35=`W`</ResponseField>

<ResponseField name="262 - MDReqID" type="string" required>
  Unique request identifier.
</ResponseField>

<ResponseField name="55 - Symbol" type="string" required>
  Asset Pair listed on the exchange.
</ResponseField>

<ResponseField name="268 - NoMDEntries" type="integer" required>
  Number of entries following.

  <Expandable title="repeating group" defaultOpen>
    <ResponseField name="269 - MDEntryType" type="integer" required>
      **Possible values:**

      * `0` : Bid
      * `1` : Offer

      Trades will only be transmitted via [Market Data Incremental Refresh](/exchange/api-reference/unified-fix/mdir) messages.
    </ResponseField>

    <ResponseField name="278 - MDEntryID" type="string" required>
      Unique identifier for this market data entry. OrderID for the Level 3 subscription.
    </ResponseField>

    <ResponseField name="270 - MDEntryPx" type="float" required>
      Price of the market data entry.
    </ResponseField>

    <ResponseField name="271 - MDEntrySize" type="float" required>
      Volume represented by the market data entry.
    </ResponseField>

    <ResponseField name="273 - MDEntryTime" type="string" required>
      Time of market data entry.
    </ResponseField>

    <ResponseField name="5060 - MDEntryTimestamp" type="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).
    </ResponseField>

    <ResponseField name="5273 - MDEntryTimeQueue" type="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).
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="trailer" type="" required />

<CodeGroup>
  ```text Spot L2 Example theme={null}
  8=FIX.4.4|9=208|35=W|34=21|49=KRAKEN-MD|52=20230707-13:49:11.245|56=MYCOMPID|55=BTC/USD|262=3|268=2|269=1|278=O30300.0|270=30300.0|271=8.44867022|273=13:49:07.307|269=0|278=B30299.9|270=30299.9|271=0.67373926|273=13:49:10.179|10=254|
  ```

  ```text Futures L3 Example theme={null}
  8=FIX.4.4|9=87775|35=W|34=2|49=KRAKEN-DRV-MD|52=20250304-15:25:09.911|56=MYCOMPID_DRV|55=PF_ETHUSD|262=1|268=10|269=1|278=00bf00ff-00bb-00f7-00ed-006f007f00de|270=2043.1|271=2.05|273=15:25:09.883|269=1|278=009e005a-00b9-0035-00ff-009e00ce007e|270=2043.9|271=2.05|273=15:25:09.767|...|10=000|
  ```
</CodeGroup>