Credentials and Verification

System Overview Diagram

Before establishing a FIX 4.4 connection with ACY Connect, ensure the client's source IP is whitelisted on the ACY Connect firewall.

The initial connection follows these steps:

  1. Socket setup – The client opens a TCP socket to the ACY Connect FIX API server on the designated port.
  2. Logon – The client sends a FIX Logon message (35=A).
  3. Acknowledgement – ACY Connect responds with a FIX Logon message (35=A) confirming the session.
  4. Heartbeat maintenance – Both sides exchange Heartbeat messages (35=0) to keep the connection alive.

This sequence secures the link through firewall protection, providing a stable channel for subsequent quoting and trading activity.

Credentials

When connecting to the ACY Connect FIX API, customers receive a set of connection details that must be configured in their FIX engine for both Quote and Trade sessions:

  • IP Address – endpoint provided by ACY Connect
  • Port – designated FIX listening port
  • SenderCompID – client's unique identifier
  • TargetCompID – ACY Connect's unique identifier
  • Password – session password supplied by ACY Connect

Verification

Before testing FIX message flow, confirm network connectivity with a Telnet check:

telnet <IP Address> <Port>

A blank screen means the connection is successful. If the test fails or returns an error, contact ACY Connect Support for assistance.