The Free Registry
for MCP Clients
MCP clients need a verifiable, stable identity. mcpcert.org hosts the CIMD, Apple Universal Links, and Android App Links files for your app free of charge.
Already have a CIMD? Validate it →
How it works
Register
free file hosting
Provide your app details and we host its CIMD, the Apple and Android mobile verification documents on a unique subdomain {your_appname}.mcpcert.org dedicated to your app.
CIMD · verification filesVerify
free conformance testing
Point your production MCP client at our OAuth compliance sandbox. Conduct a full authorization flow test against the MCP specification with a step-by-step pass/fail trace.
MCP spec · comprehensive checkPublish
free permanent identity
Your app's CIMD URL on mcpcert.org is its permanent OAuth client_id. Publish it for your MCP client and keep the same identity regardless of any future configuration or environment changes.
client_id · forever yoursAdhere to the MCP Authorization specification and RFC 9728 .