Signed Investors MCP MCP server

An official MCP server provided by Signed (Countersigned, Inc.) that allows AI agents to interact with Signed's angel investor directory and portfolio management tools. It enables users to search for investors by sector or keyword, view public investor profiles, and manage investment pipelines, notes, and documents. The server supports both authenticated operations for portfolio tracking and a public, read-only mode for searching the investor directory without authentication.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by Countersigned, Inc.

MCP endpoint (Streamable HTTP)

https://mcp.signed.com/investors

Vendor documentation

What you can do with it

Search for angel investors by keyword, sector, or check size
Retrieve public profiles of specific investors
Log investment transactions and portfolio updates
Manage deal pipelines and upload data room documents

Tools advertised by the last live check:

search_investors
list_investors
get_investor
list_investor_followers
list_investor_following
list_sectors
list_check_sizes

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http signed-investors-mcp https://mcp.signed.com/investors

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add signed-investors-mcp --url https://mcp.signed.com/investors

Cursor

Merge this server into .cursor/mcp.json in your project, then enable signed-investors-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "signed-investors-mcp": {
      "url": "https://mcp.signed.com/investors"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "signed-investors-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.signed.com/investors",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start signed-investors-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "signed-investors-mcp": {
      "type": "http",
      "url": "https://mcp.signed.com/investors"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http signed-investors-mcp https://mcp.signed.com/investors

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "signed-investors-mcp": {
      "url": "https://mcp.signed.com/investors"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "signed-investors-mcp": {
      "serverUrl": "https://mcp.signed.com/investors"
    }
  }
}

See all 347

Do you run Signed Investors MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing