tZERO FIX API
FIX 4.2 / 4.4 protocol surface for low-latency order entry, drop-copy execution reports, market data (snapshot and incremental refresh, trading session status, security status) and Indication of Interest (IOI) market data against the tZERO ATS. Message-by-message specifications are published on the tZERO API docs site; session credentials and connectivity are arranged with tZERO.