Introduction

Inkbox gives AI agents a persistent identity with a real inbox, phone number, and secure vault, so they can send emails, receive replies, answer calls, store credentials, and manage conversations as a single, consistent entity.

Inkbox is an identity and communication layer for AI agents. Instead of treating email, phone, and credential management as separate APIs, Inkbox models them as capabilities owned by a single agent identity.

With a single SDK, your agent gets:

• An identity: a persistent, named agent with its own communication channels, all tied together
• A real email address: send and receive email, manage threads, search inboxes
• A real phone number: make and receive calls, stream audio in real time (Inkbox can handle text-to-speech / speech-to-text)
• A secure vault: store and manage encrypted credentials, API keys, SSH keys, and secrets with zero-knowledge encryption

Each agent is represented as an agent identity — a persistent object that owns its inbox, phone number, vault, and conversation history.

Agent Identity
├── Mailbox       →  send/receive email, manage threads
├── Phone number  →  calls, real-time audio streaming
└── Vault         →  encrypted credentials, API keys, secrets

Conversations persist across channels, so your agent can follow up over email after a call (or vice versa) with full context.

Channels are first-class resources:

• Each mailbox has its own address (agent@inkboxmail.com)
• Each phone number is a real PSTN number your agent can call from or receive calls on

Inkbox is designed for AI agents (and the developers building them) that need to communicate with real people: OpenClaw assistants, outbound sales agents, automated phone operators, and more.

• Follow the Quickstart to send your first email and place your first call in minutes.
• Browse the API Reference to see every endpoint in detail.