> ## Documentation Index
> Fetch the complete documentation index at: https://onextel-09023014.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Create a contact list

> Create an empty list to load contacts into.



## OpenAPI

````yaml api-reference/truecaller/openapi.yaml POST /v1/lists
openapi: 3.1.0
info:
  title: OneXtel Truecaller Business Messaging API
  version: 1.0.0
  description: >
    Send verified business messages to Truecaller users: single messages,
    templates with

    personalisation, images, files and buttons, and campaigns to contact lists.


    Every request carries a workspace API key in the `x-api-key` header. Create
    one in the

    Truecaller campaigns portal under **Developers → API keys**.


    Errors are JSON with a single `error` string (and `details` for validation
    errors):


    ```json

    { "error": "invalid phone number" }

    ```
servers:
  - url: https://truecaller.udchowdhury.me
    description: Production
security:
  - apiKey: []
tags:
  - name: Messages
    description: Send one message and read its status.
  - name: Templates
    description: Reusable messages with variables, media and buttons.
  - name: Media
    description: Upload files to attach to templates.
  - name: Contact lists
    description: Audiences for campaigns.
  - name: Campaigns
    description: Send a template to a whole contact list, now or later.
  - name: Senders
    description: The verified business profiles your workspace sends from.
paths:
  /v1/lists:
    post:
      tags:
        - Contact lists
      summary: Create a contact list
      description: >-
        Creates an empty list. Load contacts into it with [Add
        contacts](/api-reference/truecaller/add-contacts).
      operationId: createList
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
                - name
              properties:
                name:
                  type: string
                  maxLength: 100
                  example: Diwali customers, Pune
      responses:
        '201':
          description: Created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ContactList'
        '409':
          description: A list with this name exists.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    ContactList:
      type: object
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        columns:
          type: array
          items:
            type: string
          example:
            - name
            - city
        contact_count:
          type: integer
        created_at:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        error:
          type: string
        details:
          type: array
          items:
            type: object
  securitySchemes:
    apiKey:
      type: apiKey
      in: header
      name: x-api-key
      description: >-
        Workspace API key from **Developers → API keys**. It starts with
        `tc_live_`.

````

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