Cartesia Providers API

openapi: 3.0.3
info:
  title: Cartesia Agents Providers API
  description: 'The Cartesia REST API for real-time voice AI - text-to-speech and voice-changer generation (single-shot bytes or Server-Sent Events), batch speech-to-text transcription, voice management and cloning, audio infill, custom datasets, pronunciation dictionaries, API keys and scoped access tokens, the Voice Agents platform (agents, calls, call batches, phone numbers, telephony providers, webhooks, deployments, knowledge base documents/folders, and evaluation metrics), and usage reporting. All requests require a `Cartesia-Version` header and an `Authorization: Bearer` API key (`sk_car_...`) or short-lived access token. The lowest-latency, streaming surface for TTS and STT is a separate WebSocket protocol documented in the companion AsyncAPI document at asyncapi/cartesia-ai-asyncapi.yml.'
  version: '2026-03-01'
  contact:
    name: Cartesia
    url: https://cartesia.ai
  license:
    name: API documentation - Cartesia Terms of Service
    url: https://cartesia.ai/terms-of-service
servers:
- url: https://api.cartesia.ai
  description: Cartesia production API
security:
- bearerAuth: []
tags:
- name: Providers
  description: Linked telephony provider accounts.
paths:
  /providers:
    get:
      operationId: listProviders
      tags:
      - Providers
      summary: List Providers
      description: List telephony provider accounts linked to your account.
      parameters:
      - $ref: '#/components/parameters/CartesiaVersion'
      responses:
        '200':
          description: A page of provider accounts.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/Provider'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createProvider
      tags:
      - Providers
      summary: Create Provider
      description: Link a telephony provider account.
      parameters:
      - $ref: '#/components/parameters/CartesiaVersion'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              required:
              - type
              properties:
                type:
                  type: string
                  description: e.g. twilio, telnyx.
                credentials:
                  type: object
                  additionalProperties: true
      responses:
        '200':
          description: The linked provider account.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Provider'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '422':
          $ref: '#/components/responses/ValidationError'
  /providers/{id}:
    parameters:
    - name: id
      in: path
      required: true
      description: The ID of the provider account.
      schema:
        type: string
    get:
      operationId: getProvider
      tags:
      - Providers
      summary: Get Provider
      parameters:
      - $ref: '#/components/parameters/CartesiaVersion'
      responses:
        '200':
          description: The requested provider account.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Provider'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    patch:
      operationId: updateProvider
      tags:
      - Providers
      summary: Update Provider
      description: Update a provider's credentials.
      parameters:
      - $ref: '#/components/parameters/CartesiaVersion'
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                credentials:
                  type: object
                  additionalProperties: true
      responses:
        '200':
          description: The updated provider account.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Provider'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteProvider
      tags:
      - Providers
      summary: Delete Provider
      parameters:
      - $ref: '#/components/parameters/CartesiaVersion'
      responses:
        '200':
          description: Deletion confirmation.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DeleteResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    DeleteResponse:
      type: object
      properties:
        id:
          type: string
        deleted:
          type: boolean
    Provider:
      type: object
      properties:
        id:
          type: string
        type:
          type: string
          description: e.g. twilio, telnyx.
        created_at:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        title:
          type: string
        message:
          type: string
        error_code:
          type: string
        status_code:
          type: integer
        doc_url:
          type: string
        request_id:
          type: string
  responses:
    Unauthorized:
      description: Missing, invalid, or expired API key / access token.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    ValidationError:
      description: The request payload failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    CartesiaVersion:
      name: Cartesia-Version
      in: header
      required: true
      description: API version date, e.g. 2026-03-01.
      schema:
        type: string
        example: '2026-03-01'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: sk_car_... API key or short-lived access token
      description: 'Cartesia API key (sk_car_...) or a short-lived access token minted via POST /access-token, passed as Authorization: Bearer <token>. Every request also requires the Cartesia-Version header.'