Show HN: Inbox – An API and MCP server for managing DMs programmatically
docs.inboxapp.com
I'm Kevin, and I've been building Inbox (https://inboxapp.com) — A CRM and an API for sending and managing DM conversations across messaging platforms. Right now we support X (Twitter) DMs. Instagram and LinkedIn are next on the roadmap. The idea is simple: DMs are becoming a primary communication channel for sales, support, partnerships, creator outreach — but there's no good programmatic layer for them. You either copy-paste manually or hack together brittle scrapers. Inbox gives you a REST API with full thread and message management, a webhook system for real-time events (new messages, thread updates, status changes), and an MCP server so AI agents can manage your DMs directly. Your team also gets a shared inbox UI to handle conversations that need a human touch.
What you can do with the API:
- Send and receive DMs programmatically - Manage threads (assign, tag, set pipeline stages) - Sync conversation data to your CRM or internal tools - Get real-time webhook events when anything changes - Let AI agents handle DMs via our MCP server (works with Claude, Cursor, etc.)
We built this because i was doing support for my product over X DMs and realized the tooling just doesn't exist. X's own API for DMs is painful, rate-limited, and requires jumping through hoops. Most teams doing DM-based outreach or support end up with some combination of manual copy-paste, spreadsheets, and prayer. The MCP server is the part I'm most excited about. You can point Claude or any MCP-compatible agent at your Inbox and it can read conversations, send replies, tag threads, update prospect info — basically run your DM workflows autonomously. We use it internally and it's become the thing i didn't know i needed.
Honest status: X support is solid and battle-tested. Instagram and LinkedIn are coming Q2 2026. We're a small team, so I'd genuinely love feedback on what platforms and integrations to prioritize.
API docs: https://docs.inboxapp.com MCP server setup: https://docs.inboxapp.com/mcp-server
I'll be in the comments all day. Would love to hear: what DM-based workflows are you hacking together right now? What would you build if you had a clean API for this?