observatory
Independent drift detection for public MCP servers - free, read-only, reproducible.
Dominion Observatory - independent, read-only measurement of public MCP servers. Signed tool-definition captures, canonicalization-hashed so any third party can recompute them, and drift detection when a server's tools change. Free public API, no account required.
Pricing & access
observatory has a free tier, with paid plans unlocking more. Free public API. Check dominionobservatory.com for current plans.
Frequently asked questions
What is observatory?
observatory is independent drift detection for public MCP servers - free, read-only, reproducible.. Dominion Observatory - independent, read-only measurement of public MCP servers. Signed tool-definition captures, canonicalization-hashed so any third party can recompute them, and drift detection when a server's tools change. Free public API, no account required.
Is observatory free?
observatory has a free tier, with paid plans unlocking more. Free public API.
What are the best observatory alternatives?
People comparing observatory also look at Backlane, Bot403, Cypher eSIM, Reuily. See all options in the Developer Tools category on SiftFox.
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