# InboxAPI vs Postfleet (slim)

> Postfleet scores 57.6 (C) to InboxAPI's 54.5 (C) for agent inboxes. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/inboxapi-vs-postfleet.md (~2,250 tokens) · this version ~780 tokens · JSON https://www.anchorterminal.com/compare/inboxapi-vs-postfleet.json · canonical https://www.anchorterminal.com/compare/inboxapi-vs-postfleet
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-10-27
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

Postfleet scores 57.6 (C) on agent readiness against InboxAPI's 54.5 (C), and leads in 5 of 7 scored categories. InboxAPI leads on payments & pricing and transparency & trust. Both do agent inboxes.

- InboxAPI: C 54.5, rank #795 of 1217 · https://www.anchorterminal.com/tools/inboxapi.min.md
- Postfleet: C 57.6, rank #695 of 1217 · https://www.anchorterminal.com/tools/postfleet.min.md
- InboxAPI, good for A personal mailbox for one coding agent that needs to exchange mail with its owner and a few contacts at no cost. Ahead on Payments & pricing, 53 against 30; Transparency & trust, 53 against 36. Also No key needed to call it.
- Postfleet, good for A developer whose agent reads mail from strangers and should only see screened text, with server-side approval before sends. Ahead on Schema & documentation, 83 against 69; Agent ergonomics, 72 against 61; Security & auth, 68 against 57; Maintenance & community, 75 against 63.

| Category | InboxAPI | Postfleet |
| --- | --- | --- |
| Reliability (16%) | 33 | 35 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 69 | 83 |
| Agent ergonomics (13%) | 61 | 72 |
| Security & auth (14%) | 57 | 68 |
| Payments & pricing (10%) | 53 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 63 | 75 |
| Transparency & trust (7%) | 53 | 36 |

| Fact (where they differ) | InboxAPI | Postfleet |
| --- | --- | --- |
| Kind | MCP server | HTTP API |
| Vendor | Sitka Capital Pty Ltd | Postfleet |
| Hosted endpoint | `https://mcp.inboxapi.ai/mcp` | `https://api.postfleet.ai/api/v1` |
| Transports | stdio, Streamable HTTP | HTTP, Streamable HTTP, stdio |
| Auth | None | API key |
| Pricing | Free | Freemium |
| Licence | Proprietary hosted service under InboxAPI's terms of service. The CLI on GitHub is MIT | Proprietary hosted service under Postfleet's terms (effective 6 October 2026), which name no company or governing law. The MCP server package @postfleet/mcp and the TypeScript SDK postfleet are MIT on npm; the GitHub repository is a mirror of the MCP server only |
| Tools exposed | 21 | 16 |
| MCP registry | not listed | `ai.postfleet/postfleet` |
| Last release | 2026-09-22 | 2026-09-08 |
| Terms last updated | 2026-09-11 |  |
| Privacy policy last updated | 2026-09-11 |  |
| Customer content may train models | not found in the text |  |
| Terms restrict automated access | not found in the text |  |
| Terms restrict benchmarking | not found in the text |  |
| Terms or service can change without notice | not found in the text |  |
| Arbitration or class-action waiver | not found in the text |  |
| Popularity | 12 stars, 38 npm/wk | 0 stars |