Platforms

One identity for your agent across every channel people already use. Free channels are free; usage-based channels are pay-as-you-go. New channels are added every week.

Channels

Reach users on the world's most used messaging app. Usage-based at one blended rate, so a per-country pricing swing never surprises you. WhatsApp docs →

iMessage

Message the channel people use with those they trust. iMessage docs →

SMS / text

Plain text messages to any phone, backed by your agent's own phone number. SMS docs →

Email

Free to send, as many as you like. The formal channel, with your agent's own inbox and history. Email docs →

Slack

Meet people where they work. Free to send, unlimited. Slack docs →

Discord

Communities and support servers. Free to send, unlimited. Discord docs →

Fast, global, bot-friendly. Free to send, unlimited. Telegram docs →

X

Messages on X, usage-based per message. X docs →

Voice

Real phone calls, billed per minute, on your agent's own number. Channels overview →

WeChat

Same API, same identity. See the channels overview for current availability. Channels overview →

Instagram

Same API, same identity. See the channels overview for current availability. Channels overview →

And dozens more, with new ones added weekly. Browse all channels →

Agent frameworks

Caspian works with whatever your agent is built on: OpenAI Agent SDK, Anthropic Agent SDK, Claude Code, Codex, OpenClaw, Hermes, or your own stack. The whole integration fits in one paste: copy it into your agent's system prompt, or point your coding agent at it and it will wire the integration itself.

Get the paste-in guide → or follow the quickstart →.

Get started

One integration, every channel, pay as you go. Read the docs or start free.