PropXchain MCP server

@propxchain/mcp-server

MCP server for PropXchain, the UK platform for selling or buying a home: one shared, live record of the transaction for seller, buyer, conveyancer and estate agent. (Not Propchain/PROPC, the unrelated crypto token.)

Your AI assistant can join your transaction with its invite code, read status, checklists, documents and the audit trail, pull HM Land Registry and property data, explain each step, and draft messages to the other parties. Money and legal steps still wait for you.

Connect (hosted, no install)

PropXchain runs this server for you at:

https://mcp.propxchain.com/mcp

• claude.ai / Claude Desktop: Settings, Connectors, Add custom connector, paste the URL, leave client ID and secret blank.
• Claude Code: claude mcp add --transport http propxchain https://mcp.propxchain.com/mcp
• ChatGPT, Cursor and other MCP clients: add a remote (Streamable HTTP) server with the URL above. Sign-in is OAuth 2.1, discovered automatically.

You approve the connection with your PropXchain email and a 6-digit code, then give your assistant a TX-XXXX-XXXX invite code. Remove it at any time from the transaction's bot panel.

Full setup walkthrough: propxchain.com/agent. Machine-readable manifest: propxchain.com/.well-known/mcp.json. Registry listing: server.json (io.github.Madhatt4/propxchain).

Run it locally instead (stdio)

For hosts without remote MCP support. The local server generates its own Ed25519 keypair on first launch (stored on disk, never copied across boundaries); access is still per transaction via invite code.

npm install -g @propxchain/mcp-server

Then add to your Claude Desktop config (%APPDATA%/Claude/claudedesktopconfig.json on Windows, ~/Library/Application Support/Claude/claudedesktopconfig.json on macOS, ~/.config/Claude/claudedesktopconfig.json on Linux):

{
  "mcpServers": {
    "propxchain": {
      "command": "propxchain-mcp-server",
      "env": { "IC_NETWORK": "ic" }
    }
  }
}

For Claude Code, the equivalent single command is:

claude mcp add propxchain propxchain-mcp-server -e IC_NETWORK=ic

Restart your agent. In a new chat, ask:

Join propxchain transaction TX-XXXX-XXXX as a bot called "Claude Desktop"

(Get the invite code from the share panel of any of your transactions on propxchain.com.)

Identity model

On first launch, the server reads or creates an Ed25519 seed at:

• macOS / Linux: ~/.config/propxchain-mcp/identity.key (or $XDGCONFIGHOME/propxchain-mcp/identity.key if set)
• Windows: %APPDATA%/propxchain-mcp/identity.key

The file is chmod 600 on POSIX and contains a single base64-encoded 32-byte seed plus a trailing newline. The bot's principal is derived from this seed and printed to stderr at startup.

Override for ops or CI: set BOTPRIVATEKEY in env to a base64-encoded 32-byte seed. When set, the server uses this instead of reading from disk.

Tools

17 tools across these categories:

Shortened. The full README is on GitHub.