mcpbeat

AnchorRegistry MCP Server

io.github.AnchorRegistry/ar-mcp
answering

AnchorRegistry is answering right now. Last checked 3 min ago. It exposes 3 tools. Last commit 13 Jun 2026.

On-chain provenance lookup for AnchorRegistry. Resolve AR-IDs, hashes, and full trees. Authless.

Uptime history 41 hours of history · worst hour 43%
41 hours agonow
50.0%
Uptime 24h
91 of 182 checks
3
Tools
read from the server
848 ms
Response time
average over 24h
0
Stars
last commit 13 Jun 2026

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 3 min ago.

run in your terminal
claude mcp add ar-mcp --transport http https://mcp.anchorregistry.ai/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "ar-mcp": {
      "url": "https://mcp.anchorregistry.ai/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.ar-mcp]
url = "https://mcp.anchorregistry.ai/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "ar-mcp": {
      "url": "https://mcp.anchorregistry.ai/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "ar-mcp": {
      "url": "https://mcp.anchorregistry.ai/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

verify
ar_verify_arid
Resolve an AnchorRegistry AR-ID to its full provenance record. Use this when you encounter an SPDX-Anchor or DAPX-Anchor tag (e.g. in a README, paper, model card, or website) and need to confirm what the artifact is, who anchored it, when, what type it is, and whether the tree has been sealed, retracted, voided, or affirmed. Free, public, no auth required.
ar_verify_by_hash
Resolve an artifact by its SHA-256 manifest hash. Use this when you have the artifact itself but no AR-ID, and want to check whether it has been anchored. Returns the AR-ID and full provenance record if found, or a clear "not anchored" response otherwise.
resolve
ar_resolve_tree
Resolve the full provenance tree for an AR-ID. Returns every anchor in the tree (root + all descendants) with their relationships, types, manifest hashes, and timestamps. Use this when you need to understand a multi-artifact provenance chain — for example, a research paper anchored as the root with its training dataset and model weights as children.

Endpoints

URLTransportStateLatencyChecked
https://mcp.anchorregistry.ai/mcp streamable-http answering 817 ms 3 min ago
https://mcp.anchorregistry.ai/sse sse answering 227 ms 4 min ago

AnchorRegistry — questions

Answers built from our own checks of this server.

What can AnchorRegistry do?
It exposes 3 tools, read directly from the server on our last check. Among them: ar_resolve_tree, ar_verify_arid, ar_verify_by_hash. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →
Is AnchorRegistry working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 182 checks got a reply (50.0%), average response time 848 ms. The bar chart above shows every period we have measured.
How do I connect AnchorRegistry?
Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.
Does AnchorRegistry need an API key?
No. AnchorRegistry completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.
How fast is AnchorRegistry?
It answers our handshake in 848 ms on average, which is faster than 8% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.
Is AnchorRegistry open source?
Yes — it is published under the MIT licence, written in TypeScript, 0 stars on GitHub and 1 open issue. The source link is on this page, so you can read exactly what it does with your data before you connect it.