Mmcp.market

ONCE MCP server

by once.app·app.once/mcp·v0.1.0
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Music distribution for agents: upload, AI-check, submit and track releases on ONCE.

B70/100grade B
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Safety scan
B70/100

full report

Adoption
New

Little public usage data yet

Reviews

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If you have run it, two minutes of your experience saves the next person an afternoon.

ONCE tools

Tool list not cached yet. `describe` through the gateway fetches it live.

Public scan report

scanner v0.1.5 · 2026-09-19 · same rubric, same numbers if you re-run it

1 low
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 208ms (auth required)20/20
  • –Tool poisoningtools not inspected (endpoint requires auth); not countedn/a
  • Auth qualityOAuth resource metadata advertised on 40115/15
  • Maintenanceno repository listed3/15
  • Maintainer identityverified namespace with website, no repo4/10

Findings (1)

  • lowNo source repository listedmaint.no-repo
Overall 70/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

Install directly

claude mcp add --transport http mcp https://beta.once.app/api/mcp
Add to Cursor

ONCE: common questions

Is ONCE MCP server safe?
Mostly: it is graded B (70/100). Read the ONCE safety report
How do I install ONCE?
It runs remotely at beta.once.app. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.
Does ONCE need an API key?
No key to paste: it signs you in with OAuth when your client connects.
Is ONCE maintained?
The latest release is v0.1.0.
Is ONCE up?
100% of our last 6 checks got an answer. We check remote servers about four times a day.

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