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The REST API is not available yet. When it ships, it will be an HTTP form of the same actions as the CLI and MCP: conversations, messages, questions, and contacts. It will not be a second product. This page will become an overview that links to each operation. Until then it has no endpoints and no examples. Use one of these today:

CLI

From a terminal, a coding agent, or CI with INBOX_SECRET_KEY.

MCP

From a chat app, at https://mcp.agentinbox.md.
Questions that have to wait are documented in Waiting for an answer. The CLI blocks. MCP calls inbox_wait.