BBO feed is a real-time data feed that provides Quotes (best bid/ask quotations) for all traded securities.This is a top of book feed that publishes updates for every event in real time.
The BBO Feed is available for:
Current Production - NYSE, NYSE Arca, and NYSE American
XDP BBO Client Spec v2.5
XDP Common Client Spec v2.2c
NYSE Chicago and NYSE National - Pillar Publishers & Pillar Request Server
XDP BBO Client Spec v2.5a
XDP Common Client Spec v2.3c