diff --git a/api-reference/costs/property_costs.mdx b/api-reference/costs/property_costs.mdx
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--- a/api-reference/costs/property_costs.mdx
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----
-title: "Get costs by property"
-api: "GET https://api.traceloop.com/v2/costs/by-association-property"
----
-
-Query your LLM costs broken down by a specific association property. This helps you understand how costs are distributed across different values of a property (e.g., by user_id, session_id, or any other association property you track).
-
-## Request Parameters
-
-<ParamField query="property_name" type="string" required>
-  The name of the association property to group costs by (e.g., "user_id", "session_id").
-</ParamField>
-
-<ParamField query="start_time" type="string" required>
-  The start time in ISO 8601 format (e.g., "2025-04-15T00:00:00Z").
-</ParamField>
-
-<ParamField query="end_time" type="string" required>
-  The end time in ISO 8601 format (e.g., "2025-04-28T23:00:00Z").
-</ParamField>
-
-<ParamField query="env" type="string">
-  List of environments to include in the calculation. Separated by comma.
-</ParamField>
-
-<ParamField query="selected_token_types" type="string">
-  <span style={{backgroundColor: '#10b981', color: 'white', padding: '2px 6px', borderRadius: '4px', fontSize: '12px', fontWeight: 'bold'}}>NEW</span> Filter costs by specific token types. Separate multiple types with commas.
-  
-  **Supported token types:**
-  - `input_tokens` or `prompt_tokens` (automatically normalized to `prompt_tokens`)
-  - `output_tokens` or `completion_tokens` (automatically normalized to `completion_tokens`)
-  - `cache_read_input_tokens`
-  - `cache_creation_input_tokens`
-  - Other token types as they appear in your data
-  
-  **Note:** `total_tokens` cannot be used as a filter.
-  
-  **Examples:**
-  - `selected_token_types=input_tokens,output_tokens`
-  - `selected_token_types=prompt_tokens,cache_read_input_tokens`
-  - `selected_token_types=completion_tokens`
-  
-  When this parameter is omitted, costs for all token types are included.
-</ParamField>
-
-## Response
-
-<ResponseField name="property_name" type="string">
-  The name of the property that was queried.
-</ResponseField>
-
-<ResponseField name="values" type="PropertyValue[]">
-  A list of property values and their associated costs.
-</ResponseField>
-
-<ResponseField name="total_cost" type="number">
-  The total cost across all property values.
-</ResponseField>
-
-```json
-{
-  "property_name": "session_id",
-  "values": [
-    {
-      "value": "session_21",
-      "cost": 1.23
-    },
-    {
-      "value": "session_5",
-      "cost": 4.56
-    },
-    {
-      "value": "No_Value",
-      "cost": 0.78
-    }
-  ],
-  "total_cost": 6.57
-}
-```
-
-The API can return special values:
-- `"No_Association"` as property_name if no spans have the requested association properties
-- `"No_Value"` as a value for spans that don't have a value for the specified property
-- `"Unknown_Value"` for spans where the property exists but has an empty value 
\ No newline at end of file