LowPx (FIX tag 333)
LowPx (tag 333) is a Price field defined in FIX 4.4, FIX 4.2 and FIX 5.0 SP2. It appears in 1 message type, always optionally.
At a glance
- Tag
- 333
- Name
- LowPx
- Datatype
- Price (float)
- Dialects
- FIX 4.4, FIX 4.2 and FIX 5.0 SP2
- Messages
- 1
What the specification says
Represents an indication of the low end of the price range for a security prior to the open or reopen
Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.
A real message using tag 333
| Tag | Field | Wire value | Meaning |
|---|---|---|---|
| 8 | BeginString | FIX.4.4 | |
| 9 | BodyLength | 75 | |
| 35 | MsgType | f | Security Status |
| 49 | SenderCompID | BOARTEAM | |
| 56 | TargetCompID | COUNTERPARTY | |
| 34 | MsgSeqNum | 2 | |
| 52 | SendingTime | 20240101-12:00:00.000 | |
| 333 | LowPx | 1.09210 | |
| 10 | CheckSum | 025 |
Shown with | separators for readability. On the wire FIX uses SOH (0x01), an invisible control byte — and because BodyLength and CheckSum are computed over the actual bytes, the two forms have different checksums. Both are valid and both decode here.
Generated from the FIX 4.4 dictionary and verified at build time: it parses and validates with no issues. Open the decoder to try your own message.
Where tag 333 appears
Requiredness is a property of the message, not of the field: the same tag can be optional in one message and conditionally required in another.
| Message | MsgType | FIX 4.4 | FIX 4.2 | FIX 5.0 SP2 | Where in the message |
|---|---|---|---|---|---|
| MarketDataIncrementalRefresh | X | — | — | Optional | inside the MDIncGrp component |
| MarketDataSnapshotFullRefresh | W | — | — | Optional | inside the MDFullGrp component |
| SecurityStatus | f | Optional | Optional | Optional | directly on the message body |
Wire format
A decimal price. Precision is a venue convention, not a protocol rule, so compare the raw string when exactness matters. @boarteam/fix parses the value as a number and reports parse/invalid-float when it does not lex as one; the raw string is kept so precision and trailing zeros are never lost.
Read tag 333 in TypeScript
import { createFixEngine } from "@boarteam/fix";import { dictionary } from "@boarteam/fix-dict-fix44";const fix = createFixEngine(dictionary);const { message, issues } = fix.parse(raw);const field = message.fields[333];field?.name; // "LowPx"field?.raw; // the verbatim wire stringfield?.value; // coerced to a numberOther Price fields
Decode this in your own code
The same engine that produced the decoded example above is an Apache-2.0 npm package with zero runtime dependencies. It runs in Node and in the browser, and parse() returns problems as data instead of throwing.
npm i @boarteam/fix @boarteam/fix-dict-fix44