LIVE quote age within its class limit ·
DELAYED older than live, or age unknown ·
STALE past the operational limit — not usable ·
FALLBACK served by a non-primary source ·
CLOSED market shut ·
italic bid/ask, "syn" spread = no market spread: mid-only source bracketed by a fixed half-pip ·
data refreshes once per 60 s ·
/api/quality