> ## Documentation Index > Fetch the complete documentation index at: https://docs.cloud.coinbase.com/llms.txt > Use this file to discover all available pages before exploring further. # Prime FIX Market Data Messages **Client Beta** This feature is currently in client beta and requires account enablement. Prime FIX Market Data provides level 2 market data on FIX 5.0 for Prime Trading Spot instruments. This includes OHLCV (Open, High, Low, Close, Volume), bids and offers, and trade history data. This requires a separate API key from the API key used for FIX Order Entry. ## Getting Started To get started quickly with FIX Market Data, take a look at the sample [FIX Market Data Go reference application](https://github.com/coinbase-samples/prime-fix-md-go) on Coinbase Samples. ## Logon (A) Logon messages must conform to FIXT 1.1. For market data sessions, configure your Logon as follows: | Tag | Req | Name | Description | | :--- | :-- | :--------------- | :---------------------------------------------------------------------------- | | 8 | Y | BeginString | Must be `FIXT.1.1` | | 9 | Y | BodyLength | Length of body | | 35 | Y | MsgType | Must be `A` | | 34 | Y | MsgSeqNum | Must be `1` | | 49 | Y | SenderCompID | The Service Account ID (on messages from the client) | | 52 | Y | SendingTime | Must be within 5 seconds of server time in UTC | | 56 | Y | TargetCompID | Must be `COIN` (on messages from the client) | | 95 | Y | RawDataLength | Number of bytes in the RawData field | | 96 | Y | RawData | Client message signature (see [Logon](/prime/fix-api/admin-messages#logon-a)) | | 98 | Y | EncryptMethod | Must be `0` (none) | | 108 | Y | HeartBtInt | Heartbeat interval is capped at 300s, defaults to 30s | | 141 | Y | ResetSeqNumFlag | Resets the sequence number. Can be `Y`/`N` | | 553 | Y | Username | Client API Key (Replaces tag 9407) | | 554 | Y | Password | Client API passphrase | | 1137 | Y | DefaultApplVerID | Must be `9` (FIX 5.0 SP2) | | 9406 | Y | DropCopyFlag | Must be `N` | | 10 | Y | CheckSum | Checksum | ## Supported Message Types The Prime FIX Market Data API supports the following message types: **Client to Server:** * MarketDataRequest (V) **Server to Client:** * MarketDataRequestReject (Y) * MarketDataSnapshotFullRefresh (W) * MarketDataIncrementalRefresh (X) * SecurityStatus (f) ## MarketDataRequest (V) Sent by the client when placing a market data request. | Tag | Req | Name | Description | | :--- | :-- | :---------------------- | :---------------------------------------------------------------------------------------------------------------------------- | | 262 | Y | MDReqID | Client unique identifier for market data request | | 263 | Y | SubscriptionRequestType | `0` = Snapshot only
`1` = Snapshot+Updates (Subscribe)
`2` = Disable previous Snapshot+Update (Unsubscribe) | | 264 | Y | MarketDepth | `0` = Full depth (L2)
`1` = Top of book
`N>1` = Report best N price tiers of data | | 265 | N | MDUpdateType | Required if SubscriptionRequestType \<263> = 1:
`0` = Snapshot+Updates
`1` = Updates only | | 267 | Y | NoMDEntryTypes | Number of MDEntryType \<269> fields requested | | ↳269 | Y | MDEntryType | `0` = Bid
`1` = Offer
`2` = Trade
`4` = Open
`5` = Close
`7` = High
`8` = Low
`B` = Volume | | 146 | Y | NoRelatedSym | Number of Symbols \<55> requested | | ↳55 | Y | Symbol | Repeating group of symbols for which the client requests market data | ## MarketDataRequestReject (Y) Sent by the server in case the MarketDataRequest (V) fails. | Tag | Req | Name | Description | | :-- | :-- | :------------- | :----------------------------------------------- | | 262 | Y | MDReqID | Client unique identifier for market data request | | 281 | Y | MDReqRejReason | See [MDReqRejReason table](#mdreqrejreason) | | 58 | N | Text | User friendly error message | ### MDReqRejReason Possible values for MDReqRejReason (see [MarketDataRequestReject (Y)](#marketdatarequestreject-y)). | Value | Description | | :---- | :------------------------------------- | | 0 | Unknown symbol | | 1 | Duplicate MDReqID | | 2 | Insufficient bandwidth | | 3 | Insufficient permission | | 4 | Invalid SubscriptionRequestType \<263> | | 5 | Invalid MarketDepth \<264> | | 6 | Unsupported MDUpdateType \<267> | | 7 | Other | | 8 | Unsupported MDEntryType \<269> | ## MarketDataSnapshotFullRefresh (W) Sent by the server to view a new stream of market data information. | Tag | Req | Name | Description | | :---- | :-- | :------------ | :---------------------------------------------------------------------------------------------------------------------------- | | 262 | Y | MDReqID | Client unique identifier for market data request | | 55 | Y | Symbol | The trading pair from MarketDataRequest | | 268 | Y | NoMDEntries | Number of market data updates in snapshot | | 911 | Y | TotNumReports | Total number of reports being sent in response to a single request | | 963 | Y | ReportID | Unique identifier of the report itself | | ↳269 | Y | MDEntryType | `0` = Bid
`1` = Offer
`2` = Trade
`4` = Open
`5` = Close
`7` = High
`8` = Low
`B` = Volume | | ↳278 | Y | MDEntryID | Unique identifier for this market data entry | | ↳83 | Y | RptSeq | Public sequence number for each entry in the snapshot by symbol | | ↳270 | N | MDEntryPx | Price of the market data entry (Not present if MDEntryType = B) | | ↳271 | N | MDEntrySize | Volume represented by the market data entry (Not present if MDEntryType = 4, 5, 7, or 8) | | ↳272 | Y | MDEntryDate | Date of the market data entry | | ↳2446 | N | AggressorSide | If MDEntryType = 2 (Trade), the side of the order:
`1` = Buy
`2` = Sell | | ↳273 | Y | MDEntryTime | Time of the market data entry | | ↳453 | N | NoPartyIDs | Only present if MDEntryType = 2 (Trade). Will always be 1 | | ↳↳448 | N | PartyID | Market Identifier Code (MIC) for Venue | | ↳↳447 | N | PartyIDSource | Will always be `G`, Market Identifier Code (MIC) | | ↳↳452 | N | PartyRole | Will always be `73`, Execution Venue | ## MarketDataIncrementalRefresh (X) Sent by the server to view updates to an existing stream. | Tag | Req | Name | Description | | :---- | :-- | :------------- | :---------------------------------------------------------------------------------------------------------------------------- | | 262 | Y | MDReqID | Client unique identifier for market data request | | 55 | Y | Symbol | The trading pair from MarketDataRequest | | 268 | Y | NoMDEntries | Number of market data updates in snapshot | | ↳279 | Y | MDUpdateAction | Type of entry update:
`0` = NEW
`1` = CHANGE
`2` = DELETE | | ↳269 | Y | MDEntryType | `0` = Bid
`1` = Offer
`2` = Trade
`4` = Open
`5` = Close
`7` = High
`8` = Low
`B` = Volume | | ↳278 | Y | MDEntryID | Unique identifier for this market data entry | | ↳83 | Y | RptSeq | Public sequence number for each entry in the snapshot by symbol | | ↳270 | N | MDEntryPx | Price of the market data entry (Not present if MDEntryType = B) | | ↳271 | N | MDEntrySize | Volume represented by the market data entry (Not present if MDEntryType = 4, 5, 7, or 8) | | ↳272 | Y | MDEntryDate | Date of the market data entry | | ↳2446 | N | AggressorSide | If MDEntryType = 2 (Trade), the side of the order:
`1` = Buy
`2` = Sell | | ↳273 | Y | MDEntryTime | Time of the market data entry | | ↳453 | N | NoPartyIDs | Only present if MDEntryType = 2 (Trade). Will always be 1 | | ↳↳448 | N | PartyID | Market Identifier Code (MIC) for Venue | | ↳↳447 | N | PartyIDSource | Will always be `G`, Market Identifier Code (MIC) | | ↳↳452 | N | PartyRole | Will always be `73`, Execution Venue | ## SecurityStatus (f) Sent by the server once when an existing stream fails, and once when it reconnects. | Tag | Req | Name | Description | | :-- | :-- | :-------------------- | :--------------------------------------------------------------------------------------------------------------------------- | | 55 | Y | Symbol | Symbol | | 326 | Y | SecurityTradingStatus | `3` = Resume
`999` = Market data feed temporarily unavailable | | 58 | Y | Text | Market data feed temporarily unavailable for MDReqID `{MDReqID}` for stream type:
- bid/offer
- trade
- OHLCV |