AgentiSend is a transactional email API for AI agents and the developers who run them. It sends receipts, password resets, sign-in codes, invoices and alerts from your own verified domain over a REST API or a hosted MCP server, with guardrails that stop an agent from sending more than you allow.
Every API key is created with a send budget, monthly by default or hourly or daily, plus a per-minute ceiling, and a key cannot raise its own budget. Repeated sends that look like a loop are held before they leave. An approval queue can hold a risky send until a person approves it, and one kill switch pauses every key at once. When a send is refused, the response names a code, a message, the fix (the exact call that repairs it), a docs link and whether a retry will work, so an agent can recover without a human reading logs.
Developers get 232 API operations described in OpenAPI 3.1, SDKs for Node, Python, Go and PHP, batch sends of up to 500 messages per request, an Idempotency-Key on every write remembered for 7 days, and 48 webhook event types. Failed webhooks are retried 10 times, then dead-lettered and can be replayed. The console shows every message in one of 12 filterable statuses, with the delivery reason and raw MIME behind each one. Domains are signed with 2048-bit DKIM keys. Contacts, segments, broadcasts and automations are included for product email beyond one-to-one sends.
The MCP server works with Claude, ChatGPT, Cursor, Claude Code and any MCP client, so an agent can verify a domain, check a budget and send mail as tool calls.
Pricing is published in full. The Free plan has no card and no expiry: 3,000 emails a month, 100 a day, 3 sending domains, and test sends never count. Paid plans start at $9 a month (Starter, 30,000 emails), then Pro at $16 (50,000) and Scale at $72 (100,000), with 40% off billed yearly. Lifetime plans start at $49 once for 250,000 emails that never expire. Team seats are never billed, and sending pauses at the inclusion unless an owner turns on overage up to a ceiling they set.
Teams moving from Resend, SendGrid, Mailgun or Postmark can follow the published migration guides. AgentiSend is built for transactional and product email to people who asked for it; there is no tool for unsolicited or cold outreach mail.
Average Rating: 4.9/5.0
Total Reviews: 6
How Do G2 Users Rate AgentiSend?
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Has the product been a good partner in doing business?: 10.0/10 (Category avg: 9.1/10)
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Performance and Reliability: 7.5/10 (Category avg: 9.1/10)
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Enterprise Scalability: 5.0/10 (Category avg: 8.5/10)
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Mail Send API: 10.0/10 (Category avg: 8.9/10)
Who Is the Company Behind AgentiSend?
