> ## Documentation Index > Fetch the complete documentation index at: https://docs.vocily.ai/llms.txt > Use this file to discover all available pages before exploring further. # Voices > Every voice you can put in `voice.voice_id`. `languages` is the set a voice is certified for, and it is what decides whether an agent saves: a provider handed a language it cannot speak fails while the call is being set up, so the call dies before the caller hears anything. ```http theme={"dark"} GET /v1/voices?provider=vocily&language=hi-IN ``` Filter by either. Vocily publishes per-voice locales; the other providers certify per **provider**, so every voice of theirs carries the provider's own list. ## OpenAPI ````yaml developers/openapi.json GET /v1/voices openapi: 3.1.0 info: title: Vocily API description: >- Public REST API for Vocily. Build and configure an agent, publish a version and put it live, place outbound calls, and read back calls, chats and what the agent remembered. Authenticate with a workspace API key as a Bearer token. Some things stay in the dashboard, by design: creating an API key, buying or connecting a phone number, setting an agent's webhook URL, connecting WhatsApp and its templates, building HTTP tools, and running batch campaigns. version: v1 servers: - url: https://api.vocily.ai description: Production security: [] paths: /v1/voices: get: tags: - catalogues summary: List Voices description: >- Voices you can put in `voice.voice_id`. `languages` is the set a voice is certified for, and it is what decides whether an agent can be saved: a provider handed a language it cannot speak fails while the pipeline is being built, so the call dies before the caller hears anything. Vocily publishes per-voice locales; the other providers certify per PROVIDER, so every voice of theirs carries the provider's own list (`GET /v1/tts-capabilities`). operationId: list_voices_v1_voices_get parameters: - name: provider in: query required: false schema: anyOf: - type: string - type: 'null' description: Only this provider's voices. Omit for every provider. title: Provider description: Only this provider's voices. Omit for every provider. - name: language in: query required: false schema: anyOf: - type: string - type: 'null' description: Only voices certified for this language code, e.g. `hi-IN`. title: Language description: Only voices certified for this language code, e.g. `hi-IN`. responses: '200': description: Voices you can put in `voice.voice_id`. content: application/json: schema: type: array items: type: object properties: provider: type: string enum: - vocily - sarvam - cartesia - elevenlabs - smallest voice_id: type: string description: What goes in `voice.voice_id`. name: type: string gender: type: string language: type: string description: The voice's own language, e.g. `hi-IN`. languages: type: array items: type: string description: >- Every language this voice is certified for. An agent whose `language.default` is not in here is refused on save. example: - provider: vocily voice_id: bn-IN-abhik name: Abhik gender: male language: bn-IN languages: - bn-IN - hi-IN - provider: vocily voice_id: bn-IN-arnab name: Arnab gender: male language: bn-IN languages: - bn-IN - hi-IN - provider: elevenlabs voice_id: EXAVITQu4vr4xnSDxMaL name: Sarah gender: female language: Multi languages: - ar - as-IN - bn-IN - de-DE - en-GB - en-IN - en-US - es-ES - fr-FR - gu-IN - hi-IN - it-IT - ja-JP - kn-IN - ml-IN - mr-IN - nl-NL - or-IN - pa-IN - pt-PT - ru-RU - ta-IN - te-IN - ur-IN '401': description: Missing or invalid API key. content: application/json: schema: $ref: '#/components/schemas/ApiError' example: detail: Invalid API key code: UNAUTHORIZED '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' '429': description: Rate limit exceeded — honor `Retry-After`. content: application/json: schema: $ref: '#/components/schemas/ApiError' example: code: rate_limited security: - bearerAuth: [] components: schemas: ApiError: type: object description: >- Error envelope. `code` is derived from the HTTP status, so branch on it for the CLASS of failure; the specific reason is `detail.code`. Every public refusal carries both. properties: detail: type: object description: >- The reason. `code` is the domain reason (e.g. `call_not_found`) and `message` is a sentence safe to log. On a `422` it also carries `errors[]`, one entry per rejected field — see `HTTPValidationError`. properties: code: type: string example: call_not_found message: type: string example: Call not found required: - code - message code: type: string description: Derived from the HTTP status, not the domain reason. example: NOT_FOUND HTTPValidationError: type: object title: HTTPValidationError description: >- A request the API could not read: a field of the wrong type, out of range, missing, or one we do not accept. Same envelope as every other error. properties: detail: type: object description: >- What was wrong, as `code`, a one-line `message`, and every offending field in `errors`. required: - code - message - errors properties: code: type: string enum: - validation_error message: type: string description: >- The first problem in one line, with a count of the rest — e.g. `model.temperature: Input should be less than or equal to 2 (and 1 more)`. errors: type: array items: $ref: '#/components/schemas/ValidationError' description: >- One entry per offending field. **Every problem is reported at once**, not just the first, so a malformed body needs one round trip to fix rather than one per field. code: type: string enum: - VALIDATION_ERROR description: Derived from the HTTP status, as on every error. ValidationError: type: object title: ValidationError required: - field - message - type properties: field: type: string description: >- The offending field as a path from the root of your request — `voice.speed`, `variables[0].key`, or `query.limit` for a query parameter. **This is the field to read.** message: type: string description: What is wrong with it, in plain language. type: type: string description: >- A stable machine code for the kind of failure, e.g. `extra_forbidden` for a field we do not accept, `missing` for a required one, or `less_than_equal` for a number out of range. Switch on this rather than on `message`, which may be reworded. securitySchemes: bearerAuth: type: http scheme: bearer description: 'Your API key as a Bearer token, e.g. `Authorization: Bearer vk_…`.' ````