> ## Documentation Index > Fetch the complete documentation index at: https://docs.agentbody.io/llms.txt > Use this file to discover all available pages before exploring further. # Download YouTube music audio > Use this operation to save the audio from one public YouTube or YouTube Music URL as MP3, M4A, or WebM. The response contains a retained audio file URL and normalized track metadata. ## OpenAPI ````yaml /api-reference/openapi.json post /v1/youtube/music/download openapi: 3.1.0 info: description: >- Direct authenticated APIs for public social data, people data, transcripts, documents, text, and SEO. Send an API key as a Bearer token. Responses never include provider credentials or raw provider payloads. license: name: Proprietary url: https://agentbody.io title: AgentBody API version: '2026-08-19' servers: - url: https://api.agentbody.io security: - bearerAuth: [] paths: /v1/youtube/music/download: post: tags: - youtube summary: Download YouTube music audio description: >- Use this operation to save the audio from one public YouTube or YouTube Music URL as MP3, M4A, or WebM. The response contains a retained audio file URL and normalized track metadata. operationId: post_v1_youtube_music_download parameters: - $ref: '#/components/parameters/IdempotencyKey' requestBody: content: application/json: schema: $ref: '#/components/schemas/MusicDownloadRequest' required: true responses: '200': $ref: '#/components/responses/MusicDownloadSuccess' '400': content: application/json: example: error: code: INVALID_ARGUMENT message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: INVALID_ARGUMENT type: string message: type: string required: - code - message type: object required: - error type: object description: Correct the input; do not retry unchanged. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '401': content: application/json: example: error: code: UNAUTHENTICATED message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UNAUTHENTICATED type: string message: type: string required: - code - message type: object required: - error type: object description: Configure a valid API key; do not retry unchanged. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '409': content: application/json: example: error: code: CONFLICT message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: CONFLICT type: string message: type: string required: - code - message type: object required: - error type: object description: Follow the documented Idempotency-Key behavior before retrying. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '502': content: application/json: example: error: code: UPSTREAM_INVALID_RESPONSE message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UPSTREAM_INVALID_RESPONSE type: string message: type: string required: - code - message type: object required: - error type: object description: Retry with backoff, then report temporary unavailability. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '503': content: application/json: example: error: code: UPSTREAM_UNAVAILABLE message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UPSTREAM_UNAVAILABLE type: string message: type: string required: - code - message type: object required: - error type: object description: Retry with backoff, then report temporary unavailability. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string '504': content: application/json: example: error: code: UPSTREAM_TIMEOUT message: example error schema: additionalProperties: false properties: error: additionalProperties: false properties: code: const: UPSTREAM_TIMEOUT type: string message: type: string required: - code - message type: object required: - error type: object description: Retry with backoff, then report temporary unavailability. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string components: parameters: IdempotencyKey: description: Optional key for safely retrying a billable write request. example: request-20260819-001 in: header name: Idempotency-Key required: false schema: maxLength: 255 minLength: 1 type: string schemas: MusicDownloadRequest: additionalProperties: false properties: audio_format: default: mp3 enum: - mp3 - m4a - webm type: string region: default: US maxLength: 2 minLength: 2 pattern: ^[A-Z]{2}$ type: string url: format: uri type: string required: - url type: object MusicDownloadResult: additionalProperties: false properties: audio_format: type: string audio_url: format: uri type: string bitrate: format: int64 type: integer bytes: format: int64 type: integer channel_title: type: string content_type: type: string duration_seconds: type: number size_mb: type: number title: type: string url: format: uri type: string video_id: type: string required: - video_id - url - title - audio_url - content_type - audio_format type: object responses: MusicDownloadSuccess: content: application/json: example: audio_format: mp3 audio_url: https://example.com/audio.mp3 bitrate: 192000 bytes: 4194304 channel_title: Example Channel content_type: audio/mpeg duration_seconds: 180 size_mb: 4 title: Example Track url: https://www.youtube.com/watch?v=Gef1KePPRoI video_id: Gef1KePPRoI schema: $ref: '#/components/schemas/MusicDownloadResult' description: Retained audio file and normalized public track metadata. headers: X-Request-Id: description: Gateway request identifier for support and audit. schema: format: uuid type: string securitySchemes: bearerAuth: scheme: bearer type: http ````