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API v1 is deprecated. It stops responding on 3 December, 2026. Build with API v2, and move an existing integration with the migration guide.

What is Inboxapp?

Inboxapp is the API for sending and managing DM conversations across messaging platforms. API v1 covers X (Twitter). LinkedIn and WhatsApp are available through API v2. Send and receive DMs through a unified API, sync conversations with your systems, and build custom workflows. Your team also gets a fast inbox interface to manage conversations, assign threads, and collaborate in real time.
Platform support: API v1 supports X (Twitter) DMs. LinkedIn and WhatsApp are available through API v2, and Telegram, iMessage and Instagram are coming in Q4 2026. See Supported platforms for the full roadmap.
For teams:
  • Manage all X DM conversations in one place
  • Assign, tag, and track conversations
  • Organize with tags and workflow stages
  • Real-time collaboration
For developers:
  • Programmatic access to all conversations
  • Reliable message delivery
  • Sync data with external systems
  • Build custom integrations

What you can build

Messaging automation

Send DMs programmatically. Build custom send workflows, schedule messages, and handle delivery.

CRM integration

Sync conversations to HubSpot, Salesforce, or your internal tools. Keep your systems in sync.

AI-powered responses

Build intelligent auto-replies. Answer questions, handle conversations, and route complex queries to your team.

Custom dashboards

Track response rates, measure team performance, and build analytics on top of your DM data.

Get started with the API

Prerequisites: An Inboxapp account with API access enabled. Set your API token:
Make your first request:

Quick start

Send your first DM in 5 minutes

Authentication

Get your API token

Next steps

Core concepts

Understand threads, prospects, and the data model

API reference

Explore all endpoints

Managing threads

Work with conversations

Webhooks

Get notified when events happen in real time

Troubleshooting

Common issues and fixes

Why teams choose Inboxapp

Assign conversations, track who’s handling what, and collaborate without stepping on each other’s toes. Tags and workflow stages keep your conversations organized.
Automate message delivery, CRM syncing, conversation routing — and keep the human touch for what matters.
Role-based access, team-wide rate limits, and multi-account support. Connect multiple X accounts and manage them from one workspace.