Contacts API
Create or update a CRM contact from any server with one POST, with tags, custom fields,
attribution and consent records. Read the guide.
NexaCloser developer docs
Send leads into the CRM, register webinar attendees, trigger automations and let AI clients work with your workspace.
What you can build
Section titled “What you can build”MCP server
Connect Claude, Cursor or any MCP client to your workspace. 216 tools across the CRM, messaging, calendar, automations and ad platforms. Connect a client.
Webinar registrations
Register attendees from your own landing page and get each one’s personal watch link. Read the guide.
Webhooks
Start here
Section titled “Start here”API keysOrganization and personal keys, access levels and test keys.
Roles and permissionsWhat each team role can do, and what a key can do.
ErrorsEvery error code and what to do about it.
Rate limitsLimits per key and per workspace, and the headers that report them.
Machine-readable
Section titled “Machine-readable”- OpenAPI 3.1 file:
/openapi.yaml·/openapi.json. Import it into Postman, Insomnia, code generators or AI tools. /llms.txt: an index of these docs for AI tools, and/llms-full.txtwith every page in one file.