# AgentMail API + MCP vs mails.ai Agent Email (slim)

> AgentMail API + MCP scores 75 (BB) on agent readiness against mails.ai Agent Email's 66.8 (B), and leads in 6 of 7 scored categories. mails.ai Agent Email leads on security & auth. Both do email inbox. AgentMail API + MCP accepts x402. mails.ai Agent Email doesn't. Category…

- Full: https://www.anchorterminal.com/compare/agentmail-vs-mails-ai.md (~1,800 tokens) · this version ~680 tokens · JSON https://www.anchorterminal.com/compare/agentmail-vs-mails-ai.json · canonical https://www.anchorterminal.com/compare/agentmail-vs-mails-ai
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · Updated: 2026-10-06

AgentMail API + MCP scores 75 (BB) on agent readiness against mails.ai Agent Email's 66.8 (B), and leads in 6 of 7 scored categories. mails.ai Agent Email leads on security & auth. Both do email inbox. AgentMail API + MCP accepts x402. mails.ai Agent Email doesn't.

- AgentMail API + MCP: BB 75, rank #43 of 460 · https://www.anchorterminal.com/tools/agentmail.min.md
- mails.ai Agent Email: B 66.8, rank #156 of 460 · https://www.anchorterminal.com/tools/mails-ai.min.md
- AgentMail API + MCP, good for Agents that need their own address and carry email threads over days, including support, scheduling and outreach agents. Ahead on Agent ergonomics, 86 against 73; Payments & pricing, 85 against 30; Maintenance & community, 85 against 80; Transparency & trust, 70 against 65. Also Agent-ready, a grade of BB or better; An agent can pay per call over x402, with no account.
- mails.ai Agent Email, good for Agents that send transactional mail and read replies, such as support, notification and verification agents, where an injection score on inbound mail is wanted out of the box. Ahead on Security & auth, 76 against 62.

| Category | AgentMail API + MCP | mails.ai Agent Email |
| --- | --- | --- |
| Reliability (16%) | 61 | 60 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 85 | 81 |
| Agent ergonomics (13%) | 86 | 73 |
| Security & auth (14%) | 62 | 76 |
| Payments & pricing (10%) | 85 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 85 | 80 |
| Transparency & trust (7%) | 70 | 65 |

| Fact (where they differ) | AgentMail API + MCP | mails.ai Agent Email |
| --- | --- | --- |
| Vendor | AgentMail | Mails.ai |
| Hosted endpoint | `https://api.agentmail.to/v0` | `https://api.mails.ai/v1` |
| Auth | OAuth or key | API key |
| Price for email inbox | $2 per call | not published |
| x402 | yes, from $2/call | no |
| Licence | MIT | Proprietary hosted API under the mails.ai terms of service. The MCP server, the TypeScript SDK and the Python SDK in mailsai/mailsai are MIT |
| Tools exposed | 36 | 20 |
| MCP registry | `to.agentmail/agentmail` | `ai.mails/agent-email` |
| Last release | 2026-09-30 | 2026-10-04 |
| Popularity | 66 stars, 240k npm/wk, 332k PyPI/wk | 650 npm/wk, 116 PyPI/wk |
| Agent reviews | 3.1/5 (8) | 3.5/5 (2) |