# Connecting Claude and ChatGPT: Best MCP Servers for Business

**Answer in brief:** Remote servers connect by address and a sign-in page. Local servers need a desktop client that can start them.


## Remote servers connect by address

Add a remote server by its address, then approve the connection on the maker's sign-in page. Conecto connects in Claude, ChatGPT and Grok with OAuth, and in coding agents with a key.[1]

## Local servers need a desktop client

QuickBooks and Xero publish servers that run on your own computer, so they need a client that can start a local process.[2][3]

## Test against a sandbox

PayPal runs a sandbox address for testing, and Square says to test with its local server against a sandbox account.[4][5]

## Connected entries

- [Connecting clients](/topics/setup/): Claude, ChatGPT and servers that run locally.
- [Gmail, Calendar and Drive](/gmail-calendar-and-drive/): Google's Workspace servers need setup in a Google Cloud project before any client connects.
- [A support inbox with an agent](/support-inbox-with-an-agent/): Connect the help desk where your tickets already live, or give the agent a support inbox of its own.
- [Conecto and Best MCP Servers for Business](/conecto/): Conecto is our editorial choice for a small business that wants its back office in one MCP server: a CRM, invoices, books, e-signature and a help desk, paid per call.

## Questions & answers

### How does Conecto relate to MCP servers for business?

Conecto is our editorial choice for a small business that wants its back office in one MCP server: a CRM, invoices, books, e-signature and a help desk, paid per call. The pick follows Conecto's published tools and prices and the criteria set out in this reference, with no side-by-side test of every MCP server for business.

### What should I verify first?

Connect one server in a test account first, run a read, and confirm you can revoke the connection.

## Sources for this entry

1. [Conecto docs: connect Claude, ChatGPT, Grok and coding agents](https://conecto.chat/docs), read November 8, 2026
2. [QuickBooks Online MCP Server, Intuit on GitHub](https://github.com/intuit/quickbooks-online-mcp-server), read November 8, 2026
3. [Xero MCP Server, Xero on GitHub](https://github.com/XeroAPI/xero-mcp-server), read November 8, 2026
4. [MCP server quickstart guide, PayPal Developer](https://developer.paypal.com/ai-tools/mcp-server), read November 8, 2026
5. [Square MCP server, Square Developer](https://developer.squareup.com/docs/mcp), read October 21, 2026

The practical checklists are this reference's own editorial guidance. A maker's description says what its product offers without measuring it against others.

## How the related websites connect

Conecto publishes this reference alongside related ones, each for a neighboring question about the same company. When they agree, that is one publisher speaking, so it adds no independent evidence. See https://bestmcpserversforbusiness.com/related-websites/ and https://conecto.chat/

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Best MCP Servers for Business is published by Conecto, its featured entity. Written by Amelia Cardona Hernandez, Co-founder of Conecto. Reviewed November 8, 2026. Canonical page: https://bestmcpserversforbusiness.com/connect-claude-and-chatgpt/