sifting/io
Enterprise · FIX 4.4

FIX API.

SiftingIO delivers its aggregated fair-price market data over FIX 4.4 as an enterprise transport. Same data, same model as our WebSocket and REST products, delivered into your OMS or trading stack over a standard FIX session.

Availability

FIX connectivity is an enterprise offering provisioned per account. Contact us to begin onboarding and certification.

At a glance

Detail
Protocol
FIX 4.4 (FIX 5.0 SP2 available on request)
Scope
Market data only, no order entry
Asset classes
Crypto (CEX + DEX), forex, commodities and metals
Transport
TCP over TLS, IP-allowlisted
Session
Continuous for crypto (24/7), market-hours-aligned for forex and metals
Data model
Aggregated fair price: bid, ask, last trade, sizes

Low-latency connectivity

Cross-connect in the datacenters where your trading systems already live. SiftingIO delivers FIX from purpose-built points of presence, placing our feed a short hop from your matching and execution stack.

TY3
Tokyo · APAC
NY4
New York · North America
LD4
London · Europe

Benefit from low-latency execution via our TY3, NY4, and LD4 datacenters, covering APAC, North American, and European trading hours on resilient cross-connects.

Session layer

Standard FIX session semantics, handled end to end:

  • Logon (35=A) with your assigned credentials and SenderCompID / TargetCompID.
  • Heartbeat (35=0) on a negotiated HeartBtInt (default 30s), with TestRequest (35=1).
  • Sequence numbers persisted per session, with ResendRequest (35=2) recovery.
  • Graceful Logout (35=5).
logon · 35=A
8=FIX.4.4|35=A|49=YOUR_SENDER|56=SIFTINGIO|34=1|52=20260625-12:00:00.000|98=0|108=30|10=000
Resend policy

Market-data messages are perishable. On a ResendRequest, we respond with SequenceReset-GapFill for market-data messages rather than replaying stale quotes. On reconnect you receive a fresh snapshot. Administrative messages are recovered normally.

Requesting market data

Subscribe with a MarketDataRequest (35=V):

  • SubscriptionRequestType (263) = 1: snapshot + updates.
  • MarketDepth (264) = 1: top of book.
  • NoRelatedSym (146): one or more symbols per request.
market data request · 35=V
8=FIX.4.4|35=V|49=YOUR_SENDER|56=SIFTINGIO|262=req-1|263=1|264=1|267=2|269=0|269=1|146=2|55=BTCUSD|55=XAUUSD|10=000

We respond with:

  • MarketDataSnapshotFullRefresh (35=W): current book on subscribe.
  • MarketDataIncrementalRefresh (35=X): live updates thereafter.
  • MarketDataRequestReject (35=Y): unknown symbol or entitlement limit.
incremental refresh · 35=X
8=FIX.4.4|35=X|49=SIFTINGIO|56=YOUR_SENDER|268=2|279=0|269=0|55=BTCUSD|270=67250.40|271=1.250|279=0|269=1|55=BTCUSD|270=67251.10|271=0.880|10=000

Unsubscribe with SubscriptionRequestType = 2.

Market data entries

Each update carries up to three MD entries in the NoMDEntries (268) group:

  • 0BidMDEntryPx (270), MDEntrySize (271)
  • 1OfferMDEntryPx (270), MDEntrySize (271)
  • 2TradeMDEntryPx (270), MDEntrySize (271)
Forex & metals

These classes have no public trade tape, so the Trade entry is omitted and price is represented by the bid and ask. Do not treat a synthetic mid as an executed print.

Symbology

Symbols use SiftingIO canonical codes in Symbol (55), for example BTCUSD, GBPUSD, XAUUSD. Discover the full tradable universe via SecurityList (35=x → 35=y), or request the static mapping sheet during onboarding.

Entitlements

Your plan defines:

  • Concurrent FIX sessions per account.
  • Symbols per session.

Requests beyond your entitlement are rejected with MarketDataRequestReject; excess sessions are refused at logon.

Onboarding & certification

From provisioning to production in four steps:

  1. 1
    Provision

    We provision SenderCompID / TargetCompID, credentials, and the TLS endpoint.

  2. 2
    Connect to UAT

    You connect from your allowlisted source IPs to a UAT session.

  3. 3
    Conformance

    We run a conformance pass against your OMS: logon, subscribe, snapshot, incremental, reconnect and gap-fill.

  4. 4
    Promote

    Promotion to the production session.

Get connected

Talk to us about FIX access

We provision your session, run a conformance pass against your OMS, and promote you to production. Reach out to begin onboarding.

Talk to us about FIX accessWebSocket protocolAPI reference