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How to connect GLEIF API with ChatGPT

Connect ChatGPT to GLEIF API MCP. Lookup lei details for 5493001kjtiigc8y1r12, list ultimate parents for lei 213800k2r6r5mvyq4d30, and more using natural language, with authentication handled for you.

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GLEIF provides free public access to Legal Entity Identifier records and related reference data. Access standardized LEI data, ownership relationships, and identifier mappings.

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How to connect GLEIF 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 GLEIF API account to ChatGPT via Composio Connect, so it can search LEIs, retrieve entity details, trace ownership relations, and map external identifiers through natural language commands without ever putting your account credentials at risk.

Also integrate GLEIF API with

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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 GLEIF 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 GLEIF 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 GLEIF API messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize GLEIF 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 GLEIF API

  • Lookup LEI details for 5493001KJTIIGC8Y1R12
  • List ultimate parents for LEI 213800K2R6R5MVYQ4D30
  • Map external identifiers to LEI for company

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

Export LEI Records

Download up to 5,000 LEI records using the complete closed field-filter and sort surface as CSV, XLSX, JSON, or XML.

Get Autocompletions

Return prefix-based GLEIF search suggestions from the provider's data collection, defaulting absent top-level metadata and links to empty objects.

Get Fund or Branch Relationship

Get the complete relationship record linking an LEI to its fund manager, umbrella fund, master fund, or head office.

Get Fuzzy Completions

Find approximate GLEIF search matches for misspelled or incomplete input.

Get LEI Issuer for Record

Get the complete LEI-issuer reference resource associated with a specified LEI record.

Get LEI Record

Retrieve one LEI record with complete provider attributes, relationships, links, and Golden Copy metadata when its LEI is known.

Get Parent Information

Get a direct or ultimate parent LEI plus complete relationship evidence, or the complete reporting exception when no parent is reported.

Get Reference Item

Get one complete item from a selected GLEIF reference collection by its collection-specific identifier.

Get Related LEI Record

Follow a selected associated-entity, managing-LOU, fund, or head-office link and return the complete related LEI record.

List Child Entities

List one page of complete direct or ultimate accounting-child LEI records.

List Child Relationships

List one page of complete direct or ultimate accounting-child relationship records for an LEI.

List Fund or Branch Entities

List one page of complete managed-fund, sub-fund, feeder-fund, or international-branch LEI records.

List Fund or Branch Relationships

List one page of complete fund-management, sub-fund, feeder-fund, or international-branch relationship records.

List LEI Field Modifications

List one page of complete LEI, relationship, or reporting-exception field-history resources with optional type, XPath, and date filters.

List LEI ISINs

Return one page of complete GLEIF-ANNA ISIN mappings for an issuer LEI.

List LEI Issuer Jurisdictions

List one page of complete jurisdiction resources for which an LEI issuer is accredited.

List Reference Data

List one complete JSON:API page from a selected GLEIF field, code, or issuer reference collection.

List Registration Agents

List all GLEIF registration agents, optionally filtered by issuer LEI or registration-agent LEI.

List Successor Entities

List one page of all successor LEI records for an entity.

Search LEI Records

Search LEI records with closed, field-aware filters and sorting, returning one complete JSON:API page.

FRAMEWORKS

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FAQ

Frequently asked questions

With a standalone GLEIF API MCP server, the agents and LLMs can only access a fixed set of GLEIF API tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from GLEIF 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 GLEIF API tools.

Yes, absolutely. You can configure which GLEIF 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 GLEIF API data and credentials are handled as safely as possible.

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