Polymarket Open Interest History (Daily Time Series)

{
  "type": "object",
  "required": [
    "condition_id"
  ],
  "properties": {
    "time_range": {
      "enum": [
        "7d",
        "30d",
        "90d",
        "180d",
        "1y"
      ],
      "type": "string",
      "default": "30d",
      "description": "Window of history to return: 7d, 30d, 90d, 180d, or 1y. This endpoint uses time_range only — it does NOT accept interval. Example: 30d. Defaults to \"30d\"."
    },
    "condition_id": {
      "type": "string",
      "minLength": 1,
      "description": "Market condition identifier. Example: 0x6fefc0438c7598b23531457c8c60541990d0786bd4bd9dfc3eabc8d95c291092."
    }
  },
  "additionalProperties": false
}

{
  "type": "object",
  "properties": {
    "data": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "timestamp": {
            "type": "number",
            "description": "Unix seconds, start of the day bucket."
          },
          "open_interest_usd": {
            "type": "number",
            "description": "Total open interest in the market, in USD, as of this day bucket."
          },
          "daily_net_change_usd": {
            "type": "number",
            "description": "Signed change in open_interest_usd versus the prior day bucket. Observed as exactly 0 on a day with no change (crypto-market-1y.json), not omitted."
          }
        },
        "additionalProperties": true
      },
      "description": "One entry per day bucket in the requested time_range window."
    },
    "meta": {
      "type": "object",
      "properties": {
        "limit": {
          "type": "number"
        },
        "total": {
          "type": "number",
          "description": "Total day buckets available for this window."
        },
        "cached": {
          "type": "boolean"
        },
        "offset": {
          "type": "number"
        }
      },
      "additionalProperties": true
    }
  },
  "description": "The daily open-interest time series for the requested market and window, as returned at routing.responseResultPath ($.output).",
  "additionalProperties": true
}