--- title: Update a unit cost description: Datadog, the leading service for cloud-scale monitoring. breadcrumbs: Docs > API Reference > Cloud Cost Management --- > For the complete documentation index, see [llms.txt](https://docs.datadoghq.com/llms.txt). # Update a unit cost{% #update-a-unit-cost %} Copy pageCopied {% tab title="v2" %} **Note**: This endpoint is in preview and is subject to change. If you have any feedback, contact [Datadog support](https://docs.datadoghq.com/help/). | Datadog site | API endpoint | | ----------------- | ----------------------------------------------------------------------- | | ap1.datadoghq.com | PUT https://api.ap1.datadoghq.com/api/v2/cost/unit_costs/{unit_cost_id} | | ap2.datadoghq.com | PUT https://api.ap2.datadoghq.com/api/v2/cost/unit_costs/{unit_cost_id} | | app.datadoghq.eu | PUT https://api.datadoghq.eu/api/v2/cost/unit_costs/{unit_cost_id} | | app.ddog-gov.com | PUT https://api.ddog-gov.com/api/v2/cost/unit_costs/{unit_cost_id} | | us2.ddog-gov.com | PUT https://api.us2.ddog-gov.com/api/v2/cost/unit_costs/{unit_cost_id} | | uk1.datadoghq.com | PUT https://api.uk1.datadoghq.com/api/v2/cost/unit_costs/{unit_cost_id} | | app.datadoghq.com | PUT https://api.datadoghq.com/api/v2/cost/unit_costs/{unit_cost_id} | | us3.datadoghq.com | PUT https://api.us3.datadoghq.com/api/v2/cost/unit_costs/{unit_cost_id} | | us5.datadoghq.com | PUT https://api.us5.datadoghq.com/api/v2/cost/unit_costs/{unit_cost_id} | ### Overview Replace an ROI metric (unit cost) with a new set of attributes. This endpoint requires the `cloud_cost_management_read` permission. ### Arguments #### Path Parameters | Name | Type | Description | | ------------------------------ | ------ | -------------------------- | | unit_cost_id [*required*] | string | The UUID of the unit cost. | ### Request #### Body Data (required) {% tab title="Model" %} | Parent field | Field | Type | Description | | ----------------- | ----------------------------------- | -------- | --------------------------------------------------------------------------------------- | | | data [*required*] | object | The data object of a unit cost replace request. | | data | attributes [*required*] | object | The attributes of a unit cost create or replace request. | | attributes | denominator_query [*required*] | object | A timeseries object containing `queries` and `formulas` arrays. | | denominator_query | formulas [*required*] | [object] | The list of formulas applied to the queries for this side of the ratio. | | denominator_query | queries [*required*] | [object] | The list of queries evaluated for this side of the ratio. | | attributes | description | string | An optional description of the unit cost. At most 2000 characters. | | attributes | name [*required*] | string | The name of the unit cost. At most 200 characters. | | attributes | numerator_query [*required*] | object | A timeseries object containing `queries` and `formulas` arrays. | | numerator_query | formulas [*required*] | [object] | The list of formulas applied to the queries for this side of the ratio. | | numerator_query | queries [*required*] | [object] | The list of queries evaluated for this side of the ratio. | | attributes | unit_label [*required*] | string | The label describing the denominator unit, for example `user`. At most 100 characters. | | data | id [*required*] | uuid | The UUID of the unit cost being replaced. Must match the `unit_cost_id` path parameter. | | data | type [*required*] | enum | The JSON:API resource type for a unit cost. Allowed enum values: `unit_cost` | {% /tab %} {% tab title="Example" %} ```json { "data": { "attributes": { "denominator_query": { "formulas": [ [] ], "queries": [ [] ] }, "description": "Amortized cloud spend divided by the number of active users.", "name": "Cloud cost per active user", "numerator_query": { "formulas": [ [] ], "queries": [ [] ] }, "unit_label": "user" }, "id": "64aecd58-e355-4f07-9c3a-56ff6bda6cd8", "type": "unit_cost" } } ``` {% /tab %} ### Response {% tab title="200" %} OK {% tab title="Model" %} A response containing a single unit cost. | Parent field | Field | Type | Description | | ----------------- | ----------------------------------- | --------- | ------------------------------------------------------------------------------------------------------------------------- | | | data [*required*] | object | The data object of a unit cost response. | | data | attributes [*required*] | object | The attributes of a unit cost. | | attributes | created_at [*required*] | date-time | The time the unit cost was created. | | attributes | created_by [*required*] | uuid | The UUID of the user who created the unit cost. | | attributes | denominator_query [*required*] | object | A timeseries object containing `queries` and `formulas` arrays. | | denominator_query | formulas [*required*] | [object] | The list of formulas applied to the queries for this side of the ratio. | | denominator_query | queries [*required*] | [object] | The list of queries evaluated for this side of the ratio. | | attributes | denominator_type [*required*] | string | The data source of the denominator queries, or `multisource` when the denominator queries span more than one data source. | | attributes | description | string | The description of the unit cost. Omitted when the unit cost has no description. | | attributes | name [*required*] | string | The name of the unit cost. | | attributes | numerator_query [*required*] | object | A timeseries object containing `queries` and `formulas` arrays. | | numerator_query | formulas [*required*] | [object] | The list of formulas applied to the queries for this side of the ratio. | | numerator_query | queries [*required*] | [object] | The list of queries evaluated for this side of the ratio. | | attributes | org_id [*required*] | int64 | The ID of the organization the unit cost belongs to. | | attributes | unit_label [*required*] | string | The label describing the denominator unit. | | attributes | updated_at [*required*] | date-time | The time the unit cost was last updated. | | attributes | updated_by [*required*] | uuid | The UUID of the user who last updated the unit cost. | | data | id [*required*] | uuid | The UUID of the unit cost. | | data | type [*required*] | enum | The JSON:API resource type for a unit cost. Allowed enum values: `unit_cost` | {% /tab %} {% tab title="Example" %} ```json { "data": { "attributes": { "created_at": "2026-09-01T18:46:15.933716Z", "created_by": "36ea1610-8866-4bd3-bb6d-9bb9fc87cad2", "denominator_query": { "formulas": [ [] ], "queries": [ [] ] }, "denominator_type": "metrics", "description": "Amortized cloud spend divided by the number of active users.", "name": "Cloud cost per active user", "numerator_query": { "formulas": [ [] ], "queries": [ [] ] }, "org_id": 321813, "unit_label": "user", "updated_at": "2026-09-01T19:52:08.820536Z", "updated_by": "13cc0adf-2595-479e-b448-5051c180dddb" }, "id": "64aecd58-e355-4f07-9c3a-56ff6bda6cd8", "type": "unit_cost" } } ``` {% /tab %} {% /tab %} {% tab title="400" %} Bad Request {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="403" %} Forbidden {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="404" %} Not Found {% tab title="Model" %} API error response. | Parent field | Field | Type | Description | | ------------ | ------------------------ | -------- | ------------------------------------------------------------------------------- | | | errors [*required*] | [object] | A list of errors. | | errors | detail | string | A human-readable explanation specific to this occurrence of the error. | | errors | meta | object | Non-standard meta-information about the error | | errors | source | object | References to the source of the error. | | source | header | string | A string indicating the name of a single request header which caused the error. | | source | parameter | string | A string indicating which URI query parameter caused the error. | | source | pointer | string | A JSON pointer to the value in the request document that caused the error. | | errors | status | string | Status code of the response. | | errors | title | string | Short human-readable summary of the error. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ { "detail": "Missing required attribute in body", "meta": {}, "source": { "header": "Authorization", "parameter": "limit", "pointer": "/data/attributes/title" }, "status": "400", "title": "Bad Request" } ] } ``` {% /tab %} {% /tab %} {% tab title="429" %} Too many requests {% tab title="Model" %} API error response. | Field | Type | Description | | ------------------------ | -------- | ----------------- | | errors [*required*] | [string] | A list of errors. | {% /tab %} {% tab title="Example" %} ```json { "errors": [ "Bad Request" ] } ``` {% /tab %} {% /tab %} ### Code Example ##### \## default # \# Path parameters export unit_cost_id="64aecd58-e355-4f07-9c3a-56ff6bda6cd8" \# Curl command curl -X PUT "https://api.datadoghq.com/api/v2/cost/unit_costs/${unit_cost_id}" \ -H "Accept: application/json" \ -H "Content-Type: application/json" \ -H "DD-API-KEY: ${DD_API_KEY}" \ -H "DD-APPLICATION-KEY: ${DD_APP_KEY}" \ -d @- << EOF { "data": { "attributes": { "denominator_query": { "formulas": [ { "formula": "denominator" } ], "queries": [ { "data_source": "metrics", "name": "denominator", "query": "avg:system.cpu.user{*}" } ], "response_format": "timeseries" }, "name": "Cloud cost per active user", "numerator_query": { "formulas": [ { "formula": "numerator" } ], "queries": [ { "data_source": "cloud_cost", "name": "numerator", "query": "sum:aws.cost.net.amortized.shared.resources.allocated{*}.rollup(sum, daily)" } ], "response_format": "timeseries" }, "unit_label": "user" }, "id": "64aecd58-e355-4f07-9c3a-56ff6bda6cd8", "type": "unit_cost" } } EOF {% /tab %}