MinOfferSize (FIX tag 648)

QtyFIX 4.4

MinOfferSize (tag 648) is a Qty field defined in FIX 4.4. It appears in 3 message types, always optionally.

At a glance

Tag: 648
Name: MinOfferSize
Datatype: Qty (float)
Dialects: FIX 4.4
Messages: 3

What the specification says

Used to indicate a minimum quantity for an offer. If this field is used the OfferSize (135) field is interpreted as the maximum offer size.

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

A real message using tag 648

Quote · FIX 4.4

Tag	Field	Wire value	Meaning
8	BeginString	FIX.4.4
9	BodyLength	87
35	MsgType	S	Quote
49	SenderCompID	BOARTEAM
56	TargetCompID	COUNTERPARTY
34	MsgSeqNum	2
52	SendingTime	20240101-12:00:00.000
117	QuoteID	EXAMPLE
648	MinOfferSize	1000000
10	CheckSum	235

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 648 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	Requiredness	Where in the message
Quote	S	Optional	directly on the message body
QuoteResponse	AJ	Optional	directly on the message body
QuoteStatusReport	AI	Optional	directly on the message body

Wire format

A decimal quantity. Fractional quantities are legal, which is why this is a float family rather than an integer. @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 648 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[648];field?.name;   // "MinOfferSize"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