Connectors Guide

Connector from the MCP registry

Proof Holdings

One API, all things verified, control, delegation, human approval, anti-impersonation.

The address

https://api.proof.holdings/mcp
Transport
Streamable HTTP
Sign-in
The registry entry asks for no key: the server either asks you to sign in when you connect (OAuth) or is open.
Published by
proof.holdings (domain checked by the registry)
Registry name
holdings.proof/mcp-server, version 1.7.1
In the registry since
9 September 2026

How to add Proof Holdings to Claude

  1. In Claude on the web or desktop, open Customize, then Connectors (Settings > Connectors in some versions).
  2. Press + Add, then Add custom connector.
  3. Name it Proof Holdings, paste the address and press Continue.
  4. Keep the sign-in Claude detects (usually Sign in when needed) and press Add.
  5. Press Connect next to it and sign in if it asks.
  6. In a chat, press +, then Connectors, to switch it on.

On your phone: connectors belong to your Claude account. Add it once on claude.ai or in the desktop app, and it is in the Claude app for iPhone and Android too: in a chat, press +, then Connectors, and switch it on.

Claude's free plan allows one custom connector; paid plans allow more. On Team and Enterprise plans an owner adds it once under Organization settings > Connectors, and each member then presses Connect. Claude's help page

How to add it to ChatGPT

  1. On chatgpt.com, on a Plus, Pro, Business, Enterprise or Edu plan, turn on Developer mode (Settings > Security and login, or Settings > Apps > Advanced settings in some versions).
  2. Open Settings > Apps and create an app (the + or Create button).
  3. Name it Proof Holdings, paste the address, choose OAuth (or No authentication if the server is open) and press Create.
  4. Sign in when it asks.
  5. In a new chat, press + and pick Proof Holdings.

ChatGPT's menus move now and then; the idea stays the same: a new app, this address, OAuth. On business plans an admin may have to allow custom apps first.

Claude Code

claude mcp add --transport http proof-holdings https://api.proof.holdings/mcp

Then run /mcp in Claude Code to sign in.

Source

This page is made from the official MCP registry on 30 October 2026 and has not been checked by hand. A connector acts as you: check who publishes it before you connect anything that can change your data.