Email and SMS API for developers and AI agents. REST, 9 SDKs, SMTP and an MCP server. Free for 5,000 emails a month.
| Founded year: | 2026 |
| Country: | United States of America |
| Funding rounds: | Not set |
| Total funding amount: | Not set |
Description
Unitpost is an email and SMS platform for developers and the AI agents they build. Send transactional email, marketing campaigns and SMS from one account, over a REST API, nine official SDKs, an SMTP relay or an MCP server.Your AI agent sends the messages. Cursor, Claude Code, Codex and other MCP clients connect with OAuth and get the same actions as the dashboard, from sending an email to verifying a domain. In the dashboard, Unit, the built-in assistant, designs templates and launches campaigns, and it asks before anything goes out.
SMS reaches 177 countries, with two-way texting on US and Canadian numbers. STOP and quiet hours are enforced at send time. Bounces and complaints suppress the address automatically, and webhooks are signed and retried.
Pricing is one flat monthly price that is also your sending balance for email and SMS. Contacts are unlimited on paid plans. The free plan includes 5,000 emails a month.
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