Fattly AI

Fattly AI Audio API

The Audio API from Fattly AI — 1 operation(s) for audio.

Documentation GitHub OpenAPI

Operations 1

POST /api/audio/generate Voiceover or music #

Specifications

⚙

OpenAPI

https://artifacts.apis.io/fattly-app/openapi/fattly-app-audio-api-openapi.yml

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OpenAPI Specification

openapi: 3.2.0
info:
  title: Fattly Audio API
  version: 1.0.0
  summary: UGC video ads, AI images, video and voiceovers from 40+ models.
  description: 'REST API of fattly.app — the same engine as the web app, the CLI (`npm i -g fattly`) and the MCP server (`https://fattly.app/api/mcp`).


    **Auth:** create a key at fattly.app → Dashboard → API keys and send `Authorization: Bearer gpx_live_...`.


    **Billing:** every generation spends credits from the key owner''s account (GET /api/models lists prices). Failed generations are refunded automatically. Keys can have a daily spend limit.


    **Async jobs:** video, video ads and other long jobs return an `id` — poll GET /api/video/status?id=... every 5-10 s until `completed` or `failed`.


    **Inputs:** image inputs must be URLs returned by POST /api/upload.


    **Content policy:** safe-for-work only, adults only, use only faces and voices you have the right to use.


    **Ad presets and creator avatars:** preset ids (templateId) and avatars are listed by the MCP tools fattly_list_ad_presets and fattly_create_avatar (MCP server: https://fattly.app/api/mcp).'
  contact:
    name: Fattly
    url: https://fattly.app
    email: contact@fattly.app
  termsOfService: https://fattly.app/regulamin
servers:
- url: https://fattly.app
security:
- bearerAuth: []
tags:
- name: Audio
paths:
  /api/audio/generate:
    post:
      tags:
      - Audio
      operationId: generateAudio
      summary: Voiceover or music
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                type:
                  type: string
                  enum:
                  - speech
                  - music
                  description: speech = voiceover from text, music = music from a description.
                text:
                  type: string
                  description: Text to read (speech) or a music description (music).
                voice:
                  type: string
                  description: Voice name, e.g. Rachel, Aria, George (speech only).
                seconds:
                  type: integer
                  enum:
                  - 15
                  - 30
                  - 60
                  description: Music length in seconds (music only).
              required:
              - type
              - text
              additionalProperties: false
      responses:
        '200':
          description: Finished audio
          content:
            application/json:
              schema:
                type: object
                properties:
                  url:
                    type: string
                    format: uri
                    description: Link to the finished file (signed, valid about 1 hour — download it or fetch a fresh link).
                required:
                - url
        '400':
          description: Invalid input or blocked content
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '401':
          description: Missing, invalid or revoked API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '402':
          description: Not enough credits
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
        '429':
          description: Rate limit or daily key spend limit reached
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Error'
components:
  schemas:
    Error:
      type: object
      properties:
        error:
          type: string
      required:
      - error
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API key gpx_live_... from fattly.app → Dashboard → API keys.
externalDocs:
  description: MCP / Claude setup
  url: https://fattly.app/claude-mcp