Extend - MountSea API

Continue a clip you already have. The source is clip_id, not a file URL. For a public file, use Upload extend. POST /suno/v2/generate returns { "taskId" }. Poll Get Task Status. Schema: GET /suno/v2/generate/schema?task=extend.

Parameters

Field	Required	Notes
`task`	Yes	`"extend"`
`model`	Yes	`chirp-v6` recommended
`clip_id`	Yes	The clip to continue
`continue_at`	No	Start extending at this second. Omit and the server picks
`prompt`	No	Lyrics for the new section
`persona`	No	Allowed on extend

Other optional fields: shared list.

Example

{
  "task": "extend",
  "model": "chirp-v6",
  "title": "Summer Vibes (Extended)",
  "tags": "Pop, Happy, Upbeat",
  "clip_id": "b6aa42d8-8ee6-40de-8953-8be4fc5d3406",
  "continue_at": 30,
  "prompt": "[Verse 2]\nContinue the journey..."
}