{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/polygon/main/json-schema/polygon-quote-schema.json",
  "title": "Polygon NBBO Quote Tick",
  "type": "object",
  "description": "A National Best Bid and Offer quote tick from the Polygon WebSocket cluster.",
  "properties": {
    "ev": { "type": "string", "const": "Q" },
    "sym": { "type": "string" },
    "bx": { "type": "integer", "description": "Bid exchange ID." },
    "bp": { "type": "number", "description": "Best bid price." },
    "bs": { "type": "integer", "description": "Bid size." },
    "ax": { "type": "integer", "description": "Ask exchange ID." },
    "ap": { "type": "number", "description": "Best ask price." },
    "as": { "type": "integer", "description": "Ask size." },
    "t": { "type": "integer", "description": "SIP timestamp (Unix milliseconds)." }
  },
  "required": ["ev","sym","bp","ap","t"]
}