MCP.Market

ONCE MCP server

online · 100% uptime
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.

B77/100grade B
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Safety scan
B77/100

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 v0.1.10 · 2026-10-14 · same rubric, same numbers if you re-run it

1 low
  • –Code scanremote-only server, no package to scann/a
  • Live reliabilityremote reachable in 192ms (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 identityendpoint served from the registry-verified namespace domain8/10

Findings (1)

  • lowNo source repository listedmaint.no-repo
Overall 77/100. Components that don't apply are left out of the denominator. Any critical finding is an F.RubricAppeal a findingJSON

How ONCE compares

Against every graded MCP server, from our own scans and uptime checks. Updated after each scan run.

Safety score
77/100
higher than 50% of 48,243 servers
Uptime
100%
of our recent checks; the typical remote server answers 100%
Response time
339 ms
faster than 47% of 30,027 servers

Install ONCE in Claude Code, Cursor or VS Code

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 (77/100). Read the ONCE safety report
How do I install ONCE?
It runs remotely at beta.once.app. Add it to Claude Code, Cursor, VS Code or Claude Desktop 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 28 checks got an answer. We check remote servers about four times a day.
How does ONCE compare with other MCP servers?
safety score 77/100 (higher than 50% of 48,243 servers); uptime 100% (of our recent checks; the typical remote server answers 100%); response time 339 ms (faster than 47% of 30,027 servers). Full comparison.