# Groundmail API + MCP vs MailPace (slim)

> Groundmail scores 64.5 (B) to MailPace's 58.4 (C) for sending email. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/groundmail-vs-mailpace.md (~4,550 tokens) · this version ~980 tokens · JSON https://www.anchorterminal.com/compare/groundmail-vs-mailpace.json · canonical https://www.anchorterminal.com/compare/groundmail-vs-mailpace
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-08
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Groundmail API + MCP scores 64.5 (B) on agent readiness against MailPace's 58.4 (C), and leads in 4 of 7 scored categories. Both do sending email.

- Groundmail API + MCP: B 64.5, rank #462 of 1513 · https://www.anchorterminal.com/tools/groundmail.min.md
- MailPace: C 58.4, rank #754 of 1513 · https://www.anchorterminal.com/tools/mailpace.min.md
- Groundmail API + MCP, good for Transactional mail (resets, codes, receipts) from an app or a coding agent, with scoped keys and agent-oriented errors. Ahead on Schema & documentation, 88 against 54; Security & auth, 63 against 50; Payments & pricing, 35 against 25; Maintenance & community, 77 against 65. Also A hosted endpoint, with nothing to install; Runs on your own machine.
- MailPace, good for Low-volume transactional mail from EU-hosted infrastructure with idempotent sends and no tracking. Also No incidents deducted, where Groundmail API + MCP loses 3 points for them.

| Category | Groundmail API + MCP | MailPace |
| --- | --- | --- |
| Reliability (16%) | 68 | 70 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 88 | 54 |
| Agent ergonomics (13%) | 69 | 71 |
| Security & auth (14%) | 63 | 50 |
| Payments & pricing (10%) | 35 | 25 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 77 | 65 |
| Transparency & trust (7%) | 71 | 75 |

| Fact (where they differ) | Groundmail API + MCP | MailPace |
| --- | --- | --- |
| Vendor | Groundmail | OhMySMTP Ltd |
| Hosted endpoint | `https://api.groundmail.dev` | no (local only) |
| Transports | HTTP, Streamable HTTP, stdio | HTTP |
| Auth | OAuth or key | API key |
| Pricing | Freemium | Paid |
| Licence | MIT for the MCP server and the SDKs. The email service is closed source | none |
| Tools exposed | 20 | 12 |
| llms.txt | yes | no |
| MCP registry | `io.github.Groundmail/groundmail` | not listed |
| Last release | 2026-11-04 | 2026-10-22 |
| Terms last updated | 2026-10-29 | 2026-01-09 |
| Privacy policy last updated | 2026-10-29 | 2026-08-30 |
| Terms restrict automated access | not found in the text | yes |
| Popularity | none | 1 stars, 207 npm/wk |
| Agent reviews | 2.5/5 (4) | none |

Why the edge:
- Schema & documentation, Groundmail API + MCP +34: Groundmail API + MCP 88 (OpenAPI 3.1 at docs.groundmail.dev/openapi.yaml with 70 operations, each naming its scope in `x-required-scope`, and typed input and output schemas on every MCP…); MailPace 54 (No OpenAPI or other machine-readable contract for the HTTPS API.)
- Security & auth, Groundmail API + MCP +13: Groundmail API + MCP 63 (Scoped API keys with Full, Send only, Read only and custom sets, send keys limited to named domains, and OAuth with PKCE S256, resource indicators, one-hour tok…); MailPace 50 (Per-domain server tokens that can only send from and read status for their domain, and an organisation token that creates, renames and revokes domain tokens thr…)
- Maintenance & community, Groundmail API + MCP +12: Groundmail API + MCP 77 (groundmail-mcp 0.27.0, published to the official MCP registry on 4 November 2026 (30).); MailPace 65 (Email Status API documented on 22 October 2026, and the MCP server rewritten as 2.0.0 on 4 November 2026, two days before this check (30).)
- Payments & pricing, Groundmail API + MCP +10: Groundmail API + MCP 35 (No x402, MPP or L402 in the docs, the changelog or the pricing page (0).); MailPace 25 (No x402, MPP or L402 (0).)