Lupin

Lupin is identity infrastructure for agents. The first channel is email: create addresses programmatically, send and receive mail, manage threads, drafts, labels, allow/block lists, custom domains, webhooks and realtime streams — all through one API.

Why inboxes for agents?

Identity — an address lets an agent sign up for services, receive confirmations and authenticate, just like a human.
Communication — threaded replies, attachments and multi-party threads, over the one protocol everything speaks.
Memory — every message is a persistent, searchable record.

The pieces

Piece	What	Where
Data plane	`POST /v0/...` REST API on Cloudflare Workers	`apps/api`
Console	Next.js app: inboxes, threads, drafts, domains, webhooks	`apps/web`
SDK	Typed TypeScript client	`packages/sdk`
CLI	`lupin` command	`packages/cli`
MCP	`POST /mcp` JSON-RPC for Claude/Cursor	same API
Infra	Alchemy: D1, R2, queues, realtime hub, Worker	`infra/`

Next: Quickstart.

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