Polymarket Open Interest History (Daily Time Series)

omnial/prediction-market-polymarket-open-interest

Given a Polymarket market's condition_id and a time window (7d, 30d, 90d, 180d, or 1y), returns a daily time series of that market's total open interest in USD along with the day-over-day net change, so you can see how capital committed to the market grew or shrank over the requested window.

activeper callv2

Price

Up to $0.0328 per call; you pay what the call used

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.00.

Data source

Polymarket

Data from Polymarket.

Use it

Your AI assistant does the work: it finds this tool, shows you the price first, runs it, and you are charged when the run finishes. There is nothing to set up for this tool in particular.

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For developers: the calls your assistant makes

agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "omnial/prediction-market-polymarket-open-interest" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "omnial/prediction-market-polymarket-open-interest" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "omnial/prediction-market-polymarket-open-interest", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "omnial/prediction-market-polymarket-open-interest", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

Not connected yet? Point your MCP client at https://mcp.eden-engine.com/mcp, then copy a config for your client.

Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0328

Updated: Oct 27, 2026

Input and output schemas

Input schema

input_schema.json

{
  "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
}

Output schema

output_schema.json

{
  "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, 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.",
  "additionalProperties": true
}