> ## Documentation Index > Fetch the complete documentation index at: https://aisa.one/docs/llms.txt > Use this file to discover all available pages before exploring further. # Get signed video stream URL > Get signed video stream URL Get signed video stream URL **Pricing** — base \$0.00145 per successful call (provider cost × 1.45; final charge scales by your plan multiplier). Charged only when the upstream response body `code` is `200`. Response structure is not yet fully documented — **refer to the actual API response**. ## Example ```bash theme={null} curl "https://api.aisa.one/apis/v1/tikhub/youtube/web_v2/get_signed_stream_url?itag=18" \ -H "Authorization: Bearer YOUR_API_KEY" ``` ## OpenAPI ````yaml openapi/tikhub.json GET /tikhub/youtube/web_v2/get_signed_stream_url openapi: 3.0.0 info: title: TikHub API description: >- Multi-platform social media data — Douyin, TikTok, Bilibili, Kuaishou, Weibo, Xiaohongshu, Zhihu, and commercial (Xingtu/Huahuo/Billboard) endpoints. version: 1.0.0 servers: - url: https://api.aisa.one/apis/v1 security: - bearerAuth: [] paths: /tikhub/youtube/web_v2/get_signed_stream_url: get: tags: - TikHub - Youtube summary: Get signed video stream URL description: >- YouTube (web_v2). ### Purpose: - Get signed playback URL for specific itag (ready to play) - Use with get_video_streams endpoint: first get all formats, then select itag to get playback URL ### Parameters: - video_id: Video ID (recommended) - video_url: Full video URL (optional) - itag: Format identifier, selected from formats list returned by get_video_streams ### Returns: - itag: Format identifier - url: Signed playback URL (ready to use) - expires_in_seconds: URL validity period (typically 6 hours = 21600 seconds) ### Notes: - Playback URLs expire after approximately 6 hours, need to regenerate after expiration - URL length is long (approximately 1000-2000 characters) - Some videos may have regional restrictions API references: `get_video_streams` = `GET /tikhub/youtube/web_v2/get_video_streams` (operationId: `get_tikhub_youtube_web_v2_get_video_streams`). operationId: get_tikhub_youtube_web_v2_get_signed_stream_url parameters: - name: video_id in: query required: false schema: type: string description: Video ID title: Video Id description: Video ID example: dQw4w9WgXcQ - name: video_url in: query required: false schema: type: string description: Ignored if video_id is provided title: Video Url description: Ignored if video_id is provided example: https://www.youtube.com/watch?v=dQw4w9WgXcQ - name: itag in: query required: true schema: type: integer description: >- Format identifier itag (obtained from get_video_streams endpoint API references: `get_video_streams` = `GET /tikhub/youtube/web_v2/get_video_streams` (operationId: `get_tikhub_youtube_web_v2_get_video_streams`). title: Itag description: >- Format identifier itag (obtained from get_video_streams endpoint API references: `get_video_streams` = `GET /tikhub/youtube/web_v2/get_video_streams` (operationId: `get_tikhub_youtube_web_v2_get_video_streams`). example: 18 responses: '200': description: >- Successful response. The outer object follows `ResponseModel`; the endpoint-specific payload is in `data`. ### Returns - itag: Format identifier - url: Signed playback URL (ready to use) - expires_in_seconds: URL validity period (typically 6 hours = 21600 seconds) content: application/json: schema: $ref: '#/components/schemas/ResponseModel' components: schemas: ResponseModel: properties: code: type: integer title: Code description: HTTP status code default: 200 request_id: title: Request Id description: Unique request identifier nullable: true type: string message: type: string title: Message description: Response message (EN-US) default: Request successful. This request will incur a charge. message_zh: type: string title: Message Zh description: Response message (ZH-CN) default: 请求成功，本次请求将被计费。 support: type: string title: Support description: Support message default: 'Discord: https://discord.gg/aMEAS8Xsvz' time: type: string title: Time description: The time the response was generated time_stamp: type: integer title: Time Stamp description: The timestamp the response was generated time_zone: type: string title: Time Zone description: The timezone of the response time default: America/Los_Angeles docs: title: Docs description: Link to the API Swagger documentation for this endpoint nullable: true type: string cache_message: title: Cache Message description: Cache message (EN-US) default: >- This response is cached and accessible via the URL below for 24 hours at no extra cost. The cache is for request tracing only — it doesn't affect the API's data freshness and won't be returned through the API again. nullable: true type: string cache_message_zh: title: Cache Message Zh description: Cache message (ZH-CN) default: >- 本次响应已缓存，可通过下方 URL 直接查看，有效期 24 小时，访问缓存链接无额外费用。缓存仅用于请求溯源，不影响接口数据的时效性，也不会再次通过接口返回。 nullable: true type: string cache_url: title: Cache Url description: The URL to access the cached result nullable: true type: string router: type: string title: Router description: The endpoint that generated this response default: '' params: title: Params description: The parameters used in the request default: {} data: title: Data description: >- Endpoint-specific response payload. The official shared model does not declare a fixed type or field set. Use the operation's documented return fields or response example; an operation-specific schema, when present, describes the documented fields. Undocumented fields must be read from the actual response rather than assumed. nullable: true type: object title: ResponseModel securitySchemes: bearerAuth: type: http scheme: bearer description: AIsa API key. Get yours at https://aisa.one ````