Leadspace Sidekick MCP: User Guide

The Leadspace Sidekick MCP connects your AI assistant directly to Leadspace's B2B data. Instead of switching tabs and copying details between tools, you just ask, for example "Enrich Acme Corp" or "Find the VP of Sales at Acme and get her email", and the answer comes straight back in your chat.

It works inside the AI tools you already use, such as Claude, Cursor and ChatGPT. You ask in plain language and Leadspace does the lookup behind the scenes. Setup takes a couple of minutes.

What you can do

Everything below works on every Leadspace plan. Your plan still decides some details, such as which search filters apply, how many lists you can keep and whether you can export to a CRM.

Before you start: create a free Leadspace account

The Leadspace Sidekick MCP is available to anyone with a Leadspace account. If you already have one, including through the Sidekick browser extension, skip to the next step.

1. Sign up at sidekick.leadspace.com using your work email. Personal email addresses aren't accepted.
2. Use that email and password to sign in when you connect the MCP.

Note: if you already use the Leadspace Sidekick browser extension, use the same account.

Connect it to your AI

Every client uses the same server address:

https://sidekick.leadspace.com/mcp/v1

Whenever a client shows Client ID or Client Secret fields, leave them blank (Cursor is the one exception, below). You only ever sign in with your Leadspace login, and you always complete that sign-in yourself in your browser.

Claude (web and desktop app)

1. Open Settings > Connectors and choose Add custom connector.
2. Name it Leadspace Sidekick, paste the address above, and leave the OAuth fields blank.
3. Click Connect, then sign in with your Leadspace login when the browser window appears.

That's it. Start a chat and ask away.

Claude Code

1. Add the server:

   claude mcp add --transport http leadspace-sidekick https://sidekick.leadspace.com/mcp/v1

2. In Claude Code, run /mcp, select leadspace-sidekick, then Authenticate.
3. Sign in with your Leadspace login in the browser window that opens.

Cursor

1. Go to Cursor Settings > MCP > Add new MCP server (or open your mcp.json).
2. Add this entry. Cursor needs Leadspace's public client ID; it is not a password.

   {
     "mcpServers": {
       "leadspace-sidekick": {
         "url": "https://sidekick.leadspace.com/mcp/v1",
         "auth": { "CLIENT_ID": "Yy6qUuX1EAz2hejQ4JUXFnMeyOcYPelU" }
       }
     }
   }

3. Click Connect and sign in with your Leadspace login when the browser window appears.

The same snippet is in Leadspace Sidekick under Settings > API Connections > Leadspace Credentials.

ChatGPT

Use ChatGPT on the web.

1. Go to Plugins > Browse directory > Add custom MCP server.
2. Enter Name: Leadspace Sidekick, Server URL: the address above, Authentication: OAuth. Leave Advanced OAuth settings as they are.
3. Tick I understand…, click Create as a plugin, then Connect, sign in with your Leadspace login and click Accept.
4. In a new chat, type @ and choose Leadspace Sidekick.

Don't see Add custom MCP server? Ask your ChatGPT workspace admin to allow custom MCP servers.

Other MCP clients

Leadspace works with any MCP-compatible client that supports remote servers and OAuth sign-in. Point it at the address above and sign in with your Leadspace login. If it asks for a client ID, use Yy6qUuX1EAz2hejQ4JUXFnMeyOcYPelU. For technical setup, see the Leadspace Sidekick MCP Developer Guide.

Using the Leadspace Sidekick MCP

Things to ask

Once connected, talk to your assistant normally. You don't need to name any tools.

What costs credits?

Looking things up and searching are free. You only spend credits to reveal a contact detail.

Good to know about credits

• One balance everywhere. The MCP uses the same credits as the Sidekick extension and the Leadspace website. A contact revealed on one is free on the others.
• No charge for missing data. If a detail isn't on file, you aren't charged. Revealing the same detail again later is free.
• Cost check first. Before revealing many contacts at once, your assistant can show the total cost and whether your balance covers it.
• Starter plan: 25 credits per day. Unused credits don't carry over, and the allowance resets at midnight UTC.
• Paid plans (Solo, Pro, Enterprise) have a larger monthly allowance.
• Bonus credits (for example from referrals) carry over and are used after your plan's allowance runs out.
• At 0 credits, lookups, search and anything you've already revealed keep working. New reveals wait until your credits reset or you upgrade.

Tips for the best results

• Be specific. A full name plus the company works far better than a name alone.
• Use standard LinkedIn links that start with www.linkedin.com/in/. If you copied a country version such as au.linkedin.com, change it to www.
• Add context such as industry or location when a company name is common.
• Keep working in the same chat. Your assistant remembers the company or list you're looking at, so you can ask follow-ups.
• Confirm before changes. Your assistant asks you before it spends credits, deletes a list, or invites or deactivates a user.

Troubleshooting

• Don't see the Leadspace Sidekick tools? Make sure you finished signing in and the connector shows as Connected. If Leadspace released new features, disconnect and reconnect to see them.
• Can't sign in? Use your Leadspace work email and password. If you don't have an account yet, sign up first.
• A filter or limit from your plan? Search, lists, signals and reveals work on every plan. When your plan doesn't include a filter, the answer says which filters were left out; a list or export limit names your plan's limit.
• "Sending requests faster than your plan allows"? Wait about a minute and try again. Nothing was charged.
• "Not enough credits"? Wait for your credits to reset, earn bonus credits in the Sidekick extension (target-audience setup, CRM connection or referrals), or upgrade in Settings > Plan & Usage on the website.
• Still stuck? Email support@leadspace.com.

Related Articles

• Leadspace Sidekick MCP: Developer Guide
• What is Leadspace API service?