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How to connect Blitz API MCP with ChatGPT

Connect ChatGPT to Blitz API MCP. Find contacts at acme inc and enrich, list open roles matching product manager, and more using natural language, with authentication handled for you.

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Blitz API is a people, company, and job search API with contact and company enrichment. Use it to enrich leads and accelerate sales outreach with accurate contact and firmographic data.

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How to connect Blitz API MCP with ChatGPT

ChatGPT can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.

In this guide, I will explain the easiest and most secure way to connect your Blitz API account to ChatGPT via Composio Connect, so it can search people, enrich contacts, lookup companies, and find job openings through natural language commands without ever putting your account credentials at risk.

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Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's Blitz API integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
  • 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
  • One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
  • Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
  • Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

Prerequisites

Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.

Step-by-step: Connect Blitz API to ChatGPT

1. Install the Composio plugin

Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.

Install in ChatGPT

Composio plugin page in ChatGPT with the Install plugin button

You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.

2. Authenticate

After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.

Composio login and Allow access screen for ChatGPT

3. Start using Composio

That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread Blitz API messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize Blitz API.

Option 2: Add Composio as an MCP server

If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.

1. Open the MCP settings

In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.

ChatGPT settings showing the Plugins page with the MCP tab selected

2. Add the server

Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
ChatGPT Add server dialog with the name Composio, type Streamable HTTP, and the Composio MCP URL

Then click Save. The Composio server now appears in your MCP plugins list.

ChatGPT Plugins page showing the Composio MCP server added to the list

3. Authenticate

Click Authenticate on the Composio entry, log in via Composio, and click Allow access. Composio tools are then available in ChatGPT the same way as with the plugin.

What you can do after connecting Blitz API

  • Find contacts at Acme Inc and enrich
  • List open roles matching product manager
  • Enrich company profiles for top leads

Security + privacy notes (important)

  • Use least-privilege access: Only grant permissions you actually need.
  • Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
  • Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
  • Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.
TOOLS

Supported Tools

Every Blitz API action and event your agent gets out of the box.

Enrich Company

Retrieve a full company profile from an exact LinkedIn company page URL.

Find Companies Hiring

Find distinct companies hiring for matching jobs and return each company's matched-job count.

Find Work Email

Retrieve a verified work email for a person identified by LinkedIn profile URL.

Get API Key Details

Validate the connected BlitzAPI key and return its record balance, per-endpoint rate limit, allowed API routes, and active plans.

Get Changelog

Return recent public BlitzAPI changelog entries newest first, optionally limited by age and count.

Get Company Employee Distribution

Return a company's employee counts and percentages grouped by country or department; each call consumes record credits.

List Company Employees

Browse employees at one exact LinkedIn company using location, seniority, department, and connection-count filters.

Resolve Domain to LinkedIn Company

Resolve a website domain or URL to its primary LinkedIn company page and possible alternatives.

Resolve LinkedIn Company to Domain

Resolve a LinkedIn company page URL to its canonical email domain.

Resolve Person

Resolve a verified work email or US phone number in E.

Search Companies

Search companies by firmographics, funding, traffic, keywords, and headquarters criteria; returns one metered page and an opaque continuation cursor.

Search Company Jobs

List live job postings for one exact LinkedIn company, optionally filtered by job attributes; return one metered page with a continuation cursor.

Search Jobs

Search live job postings by role, description, semantic keywords, recency, location, and company criteria; return one metered page with a continuation cursor.

Search People

Search professional profiles across one or more companies using person, role, location, education, and firmographic filters.

Waterfall ICP Search

Find and rank decision-makers at one company using an ordered cascade of title and location rules; successful results consume record credits.

FRAMEWORKS

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FAQ

Frequently asked questions

With a standalone Blitz API MCP server, the agents and LLMs can only access a fixed set of Blitz API tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Blitz API and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. ChatGPT fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Blitz API tools.

Yes, absolutely. You can configure which Blitz API scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Blitz API data and credentials are handled as safely as possible.

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