NexaCloser support
Overview
Create and update CRM contacts, register webinar attendees, read website analytics, receive webhooks and connect AI clients over MCP.
NexaCloser API 1.0.0
Section titled “NexaCloser API 1.0.0”The NexaCloser REST API. All endpoints are served over HTTPS and speak JSON.
Base URL: https://api.nexacloser.com/v1
Authentication: an API key from Settings → API in the NexaCloser app, sent as
Authorization: Bearer nxa_…. Keys are secrets: call the API from your server, never from
browser code. See Authentication for key types and access levels.
Errors are JSON objects with an error code. Rate limits are reported in
X-RateLimit-* headers; a 429 carries Retry-After.
Authentication
Section titled “Authentication”apiKey
Section titled “apiKey”Authorization: Bearer nxa_…. Create keys in the app under Settings → API.
Live keys start with nxa_, test keys with nxa_test_.
Security scheme type: http
Bearer format: nxa_ API key
webhookToken
Section titled “webhookToken”The secret token of an inbound webhook, shown on the webhook in the app.
Security scheme type: apiKey
Header parameter name: X-Webhook-Token
mcpOAuth
Section titled “mcpOAuth”OAuth 2.1 with PKCE (S256) and dynamic client registration, for MCP clients only.
Security scheme type: oauth2
Flow type: authorizationCode
Authorization URL: https://api.nexacloser.com/oauth/authorize
Token URL: https://api.nexacloser.com/oauth/token
Refresh URL: https://api.nexacloser.com/oauth/token
Scopes:
- mcp:read - Read CRM, marketing and automation data.
- mcp:write - Send messages, create deals, run automations and edit data.