> ## Documentation Index > Fetch the complete documentation index at: https://docs.hologram.io/llms.txt > Use this file to discover all available pages before exploring further. # Update data usage limits for devices (bulk) > Updates the data usage limit, SMS limit, and data usage alert threshold for one or more SIMs. Values must be >= -1 where -1 means no limit. ## OpenAPI ````yaml /api/1/openapi.yaml post /devices/usagelimit openapi: 3.0.0 info: title: Hologram REST API v1 description: >- The Hologram HTTP API is a REST-style interface for managing Hologram devices, accounts, and cloud data. Using the Hologram REST API, you can activate SIMs, get your devices approximate location, send SMS to your devices, update a device's usage limit, and much more. ## Authentication Hologram supports **HTTP Basic authentication** using API keys. Simply set the username of the request to `apikey`. The password field is the API key itself. You can find your API key on the Hologram Dashboard under [Account Settings](https://dashboard.hologram.io/settings/api). Your API key gives you access to your personal account, as well as any organizations you are a member of. Make sure you don't store your API key in a publicly accessible place like GitHub. If you are a member of multiple organizations, many endpoints accept an `orgid` argument to filter for devices or other objects within a specific organization. You can find your `orgid` by following [this guide from our Help Center](https://support.hologram.io/hc/en-us/articles/360035421234-What-is-my-organization-ID-orgid). ### Header Example ``` curl --verbose GET \ 'https://dashboard.hologram.io/api/1/users/me' \ -u apikey:YOUR_API_KEY ``` You can also base64 encode "apikey:YOUR_API_KEY" and include it directly in the header. ``` curl --verbose GET \ 'https://dashboard.hologram.io/api/1/users/me' \ --header "Authorization: Basic BASE64(apikey:YOUR_API_KEY)" ``` ## Requests Request bodies can be provided in either JSON or form-urlencoded formats. Please note that the examples in this documentation will only display JSON bodies. ### **JSON body** ``` curl --verbose --request POST \ --header "Content-Type: application/json" \ --header "Authorization: Basic BASE64(apikey:YOUR_API_KEY)" \ --data '{"deviceid": 56668, "body": "Hello device!"}' \ 'https://dashboard.hologram.io/api/1/sms/incoming' ``` ### **form-urlencoded body** ``` curl --verbose --request POST \ --header "Content-Type: application/x-form-urlencoded" \ --header "Authorization: Basic BASE64(apikey:YOUR_API_KEY)" \ --data 'deviceid=56668&body=Hello%20device!' \ 'https://dashboard.hologram.io/api/1/sms/incoming' ``` ## Responses All API responses are returned as JSON objects with the following fields: * `success` (boolean) - Indicates whether the request was successful. * `data` (object or array) - Contains the requested data or information about the operation that was performed. Only present when `success` is true. * `error` (string) - Information about why the request failed. Only present when `success` is false. Most GET responses will also include the following fields if a limit is included as part of the query string: * `limit` (number) - The query limit, some have this value built in and others often have a maximum value that the limit can be * `size` (number) - The number of values returned by the query * `continues` (boolean, optional) - This is only returned if there are more values than were returned * `links` (array) - Contains information related to the query performed * `path` (string) - The API endpoint path * `base` (string) - API base URL * `next` (string) - URL with query string to get the next results Note that all dates and times are returned in UTC. ## Rate Limiting In order to provide a good quality of service to all of our customers, we enforce a rate limit on all API requests. If you exceed the rate limit you will receive a HTTP 429 response with a JSON response body like this: ``` { "success":false, "error":"API rate limit exceeded" } ``` If you receive this response, you should refrain from making requests for 5-10 seconds and then retry the request. Hologram's REST API provides methods to perform many requests in bulk. For example, you can change the data plans of multiple SIMs at once using https://dashboard.hologram.io/api/1/links/cellular/changeplan. If there is request you would like to make in bulk but cannot, please reach out to [support@hologram.io](mailto:support@hologram.io) for assistance. version: '1' servers: - url: https://dashboard.hologram.io/api/1 description: Hologram REST API v1 security: [] tags: - name: Devices description: Devices - name: SIM Configuration description: SIM Configuration x-group: SIM Configuration - Conductor - name: Organizations description: Organizations - name: Personal account description: Personal account - name: Async Change Requests description: Async Change Requests paths: /devices/usagelimit: post: tags: - Devices summary: Update data usage limits for devices (bulk) description: >- Updates the data usage limit, SMS limit, and data usage alert threshold for one or more SIMs. Values must be >= -1 where -1 means no limit. operationId: changeDeviceUsageLimitBulk requestBody: required: true content: application/json: schema: required: - deviceids properties: deviceids: description: List of device IDs to update usage limits for type: array items: type: integer datathreshold: description: >- Data usage alert threshold in bytes; triggers a notification when exceeded type: number example: 1000000 overagelimit: description: >- Hard data usage cap in bytes; device is paused when this limit is reached type: number example: 2000000 smslimit: description: Maximum number of SMS messages allowed per billing period type: number example: 100 type: object responses: '200': description: OK content: application/json: schema: properties: success: $ref: '#/components/schemas/SuccessProperty' data: properties: warnings: type: array items: type: string devices_modified: description: IDs of devices whose usage limit was updated type: array items: type: integer profiles_modified: description: IDs of SIM profiles whose usage limit was updated type: array items: type: integer newdatathreshold: description: Updated data alert threshold in bytes type: number newoveragelimit: description: Updated data usage limit in bytes type: number newsmslimit: description: Updated SMS limit type: number type: object type: object '400': description: Bad request '401': description: Unauthorized security: - apiKeyAuth: [] components: schemas: SuccessProperty: description: Indicates whether the request was successful. type: boolean example: true securitySchemes: apiKeyAuth: type: http description: >- HTTP Basic authentication using API keys. Set the username to `apikey` and the password to your API key. You can find your API key on the Hologram Dashboard under Account Settings. scheme: basic ````