DocumentationRelease music, manage your catalog, and build on ONCE.
For artists
User Guide
Everything about using ONCE, from your first release to payouts.
Releasing Music
Build and submit a release with the chat agent.
Changing a Release
Replace audio or artwork, fix metadata, or take a release down.
Quick Answers
The most-asked questions as short steps: rejections, edits, YouTube, payouts.
Payouts
How royalties reach you, and when.
ONCE Support
The in-app assistant, and where to reach a person.
For developers
MCP Server
Let Claude, ChatGPT, Cursor, or any MCP client submit releases for you.
REST API
Uploads, AI detection, release submission, status, and webhooks over HTTP.
API Reference
Every MCP tool and endpoint, with request and response shapes.
Agent Discovery
Machine-readable catalogs, cards, and skills so agents find ONCE on their own.
For designers