AgentiSend

Transactional email API, up to 75% cheaper than Resend: Resend-compatible requests, a send budget on every key, a kill switch, and refusals that name the fix. AgentiSend is a transactional email API for applications and AI agents. Send receipts, password resets, sign-in codes and alerts from your own verified domain. Requests are Resend-compatible over REST, and a hosted MCP server lets an agent send on your behalf. Every new API key starts with a send budget, a kill switch stops all sending, repeated sends that look like a loop are held, and every refusal returns a code, a message and the fix. A free preflight runs every check a real send runs without sending anything.