Developers
Build on LeadLex.
Connect your AI assistant to the firm’s client record, or move data between LeadLex and your own systems.
Start here
MCP server
Connect Claude, ChatGPT, Cursor or any MCP client to a LeadLex workspace. 99 tools, OAuth sign-in.
Connect an assistantREST API
Read and write contacts, companies, deals, tasks and notes from your own systems, with a workspace API key.
API quickstartAPI keys
Admins create keys in Settings, under API & Data, with read or write access per area. Keys start with wbk_.
Create an API key
Resources
Everything else.
Documentation
Guides, authentication and the full API and MCP reference at docs.leadlex.com.
MCP endpoint
https://mcp.leadlex.com/mcp
For language models
Machine-readable indexes of this site and the docs: /llms.txt, /llms-full.txt and docs.leadlex.com/llms.txt.
Using LeadLex rather than building on it? The help center has step by step guides.