---
title: "List drift"
description: "For each model, what your calls that reported their cost really cost, against the list price of the same tokens, over the last 7 days."
canonical_url: "https://twominutebilling.com/help/developers/api-reference/model-prices/list-drift"
---
# List drift

> For each model, what your calls that reported their cost really cost, against the list price of the same tokens, over the last 7 days.

<api-operation method="GET" path="/v1/organization/model_prices/drift">
<template v-slot:docs="">

USD events only. Models with no reported cost are not listed.

## Query parameters

<table>
<thead>
  <tr>
    <th>
      Parameter
    </th>
    
    <th>
      Type
    </th>
    
    <th>
      Required
    </th>
    
    <th>
      Description
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td>
      <code>
        business
      </code>
    </td>
    
    <td>
      <code>
        string
      </code>
    </td>
    
    <td>
      no
    </td>
    
    <td>
      Only this business's usage (biz_…).
    </td>
  </tr>
</tbody>
</table>

## Response

<table>
<thead>
  <tr>
    <th>
      Field
    </th>
    
    <th>
      Type
    </th>
    
    <th>
      Description
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td>
      <code>
        object
      </code>
    </td>
    
    <td>
      <code>
        string
      </code>
    </td>
    
    <td>
      The object type; always <code>
        list
      </code>
      
      . One of <code>
        list
      </code>
      
      .
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        window
      </code>
    </td>
    
    <td>
      <code>
        object
      </code>
    </td>
    
    <td>
      The model price drift's window.
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data
      </code>
    </td>
    
    <td>
      <code>
        array of object
      </code>
    </td>
    
    <td>
      The rows on this page.
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data.object
      </code>
    </td>
    
    <td>
      <code>
        string
      </code>
    </td>
    
    <td>
      The object type; always <code>
        model_price_drift
      </code>
      
      . One of <code>
        model_price_drift
      </code>
      
      .
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data.provider
      </code>
    </td>
    
    <td>
      <code>
        string
      </code>
    </td>
    
    <td>
      The payment provider.
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data.model
      </code>
    </td>
    
    <td>
      <code>
        string
      </code>
    </td>
    
    <td>
      The pricing model.
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data.reported_cost_minor
      </code>
    </td>
    
    <td>
      <code>
        integer
      </code>
    </td>
    
    <td>
      USD cents the calls reported.
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data.list_cost_minor
      </code>
    </td>
    
    <td>
      <code>
        integer
      </code>
    </td>
    
    <td>
      USD cents the list gives for the same tokens.
    </td>
  </tr>
  
  <tr>
    <td>
      <code>
        data.difference_percent
      </code>
    </td>
    
    <td>
      <code>
        number
      </code>
    </td>
    
    <td>
      (reported ÷ list − 1) × 100. Positive: your calls cost more.
    </td>
  </tr>
</tbody>
</table>

## Status codes

<table>
<thead>
  <tr>
    <th>
      Status
    </th>
    
    <th>
      Meaning
    </th>
  </tr>
</thead>

<tbody>
  <tr>
    <td>
      <code>
        200
      </code>
    </td>
    
    <td>
      The drift per model.
    </td>
  </tr>
</tbody>
</table>
</template>

<template v-slot:request="">

```bash [Request]
curl "$TMBILLING_URL/v1/organization/model_prices/drift" \
  -H "Authorization: Bearer $TMBILLING_API_KEY"
```

</template>

<template v-slot:response="">

```json [200 OK]
{
  "object": "list",
  "window": {
    "start": "2026-03-14T09:30:00Z",
    "end": "2026-04-14T09:30:00Z"
  },
  "data": [
    {
      "object": "model_price_drift",
      "provider": "stripe",
      "model": "flat",
      "reported_cost_minor": 2900,
      "list_cost_minor": 2900,
      "difference_percent": 14.2
    }
  ]
}
```

</template>
</api-operation>


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