> ## Documentation Index
> Fetch the complete documentation index at: https://deepline.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Polymarket: Get Open Interest

> Reading the open interest of one or more markets. Includes SDK V2 guidance, input constraints, response fields, and Deepline credit cost.

Reading the open interest of one or more markets.

<Info>
  Tool ID: `polymarket_get_open_interest`
</Info>

## Run this action

This action has conditional or dynamic input fields that cannot be represented by a reliable static example.

Inspect the live contract before executing it:

```bash theme={null}
deepline tools get polymarket_get_open_interest --json
```

## Example response

The static output schema is not detailed enough to generate a reliable example. Use `deepline tools get polymarket_get_open_interest --json` for the complete live contract.

## Input reference

**Data API v2:** this route has a v2 counterpart, `GET /v2/oi`. See [Migrating to Data API v2](/docs/migrate/data-api-v1-to-v2).

| Name | Type | Required | Default | Details |
| - | - | - | - | - |
| `payload.market` | `array` | No | — | — |

<details>
  <summary>Show raw input schema</summary>

  ### Input JSON Schema

  ```json theme={null}
  {
    "type": "object",
    "description": "**Data API v2:** this route has a v2 counterpart, `GET /v2/oi`. See [Migrating to Data API v2](/migrate/data-api-v1-to-v2).",
    "properties": {
      "market": {
        "type": "array",
        "items": {
          "type": "string",
          "description": "0x-prefixed 64-hex string",
          "pattern": "^0x[a-fA-F0-9]{64}$"
        }
      }
    },
    "required": [],
    "additionalProperties": false
  }
  ```
</details>

## Output reference

Standard tool result payload.

| Name | Type | Required | Default | Details |
| - | - | - | - | - |
| `result.data` | `array` | Yes | — | Provider response payload. |
| `result.data[].market` | `string` | No | — | 0x-prefixed 64-hex string Pattern: `^0x[a-fA-F0-9]&#123;64&#125;$`. |
| `result.data[].value` | `number` | No | — | — |
| `result.meta` | `object` | No | — | Additional response metadata (status, paging). |

<details>
  <summary>Show raw output schema</summary>

  ### Output JSON Schema

  ```json theme={null}
  {
    "type": "object",
    "description": "Standard tool result payload.",
    "properties": {
      "data": {
        "type": "array",
        "description": "Provider response payload.",
        "items": {
          "type": "object",
          "properties": {
            "market": {
              "type": "string",
              "description": "0x-prefixed 64-hex string",
              "pattern": "^0x[a-fA-F0-9]{64}$"
            },
            "value": {
              "type": "number"
            }
          },
          "additionalProperties": false
        }
      },
      "meta": {
        "type": "object",
        "description": "Additional response metadata (status, paging).",
        "additionalProperties": true
      }
    },
    "required": [
      "data"
    ],
    "additionalProperties": false
  }
  ```
</details>

## Deepline cost

* Pricing model: `fixed` (per call).
* Estimated Deepline credits: `0` per pricing unit.
* Provider-native pricing may still exist outside Deepline credit billing.

## Related documentation

* [Polymarket provider guide](/docs/providers/polymarket/guide)
* [SDK V2 quickstart](/docs/sdk-v2/quickstart)
* [SDK reference](/docs/sdk-v2/sdk-reference)
* [Run tools across a CSV](/docs/sdk-v2/batch-csv)


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