LegBidPx (FIX tag 681)

PriceFIX 4.4FIX 5.0 SP2

LegBidPx (tag 681) is a Price field defined in FIX 4.4 and FIX 5.0 SP2. It appears in 2 message types, always optionally.

At a glance

Tag: 681
Name: LegBidPx
Datatype: Price (float)
Dialects: FIX 4.4 and FIX 5.0 SP2
Messages: 2

What the specification says

FIX 4.4

Bid price of this leg. See BidPx (32) for description and valid values.

FIX 5.0 SP2

Bid price of this leg.

Descriptions are quoted from the FIX Orchestra sources under the Apache 2.0 licence.

A real message using tag 681

Quote · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	129
35	MsgType	S	Quote
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
117	QuoteID	EXAMPLE
555	NoLegs2 entries	2	repeating group
600	LegSymbol	EXAMPLE
681	LegBidPx	1.09210
600	LegSymbol	EXAMPLE
681	LegBidPx	1.09210
10	CheckSum	038

Edit and decode it yourself

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.

Open in the full decoder →

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 681 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 5.0 SP2	Where in the message
Quote	S	Optional	Optional	inside the LegQuotGrp component
QuoteResponse	AJ	Optional	Optional	inside the LegQuotGrp component

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 681 in TypeScript

decode.tsts

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[681];field?.name;   // "LegBidPx"field?.raw;    // the verbatim wire stringfield?.value;  // coerced to a number

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

Try the decoder Source on GitHub