FrankKi lets an AI agent send a real, printed letter to a physical address anywhere in the world in one tool call. Compose, price, send, track. The document is printed, franked and delivered by postal partners worldwide. Built for B2B and developer use, DACH native, with German compliance (Pflichtangaben, AVV, GoBD archive) built in. Hosted and remote: nothing to install, nothing to self host. **64 agent callable tools.** Full list: https://github.com/datPascal/frankki-mcp/blob/main/docs/tools.md Smithery shows no capabilities above because `tools/list` on this server requires authentication. Connect with OAuth and your client sees all 64. - **Connect URL:** `https://mcp.frankki.app` (remote, streamable-http) - **Auth:** OAuth 2.1 (Authorization Code with PKCE, Dynamic Client Registration) or a Bearer API key - **Docs:** https://frankki.app/en/mcp - **Official MCP Registry:** `app.frankki/letters` Prepaid wallet, no subscription. Standard letter from 3,39 EUR, registered mail from 7,59 EUR, volume pricing from 1,49 EUR per letter. Delivery in 1 to 3 working days within Germany; international is priced per destination and shown before sending.
MCP readiness
Readiness is how fully this listing follows its protocol and how it behaved in our probes over 30 days. It is shown for reference and does not move it in search. Search order and leaderboards use the separate quality grade (here C+, 70.0/100), which weighs availability, conformance, p95 speed and descriptor. How the two differ
| Valid MCP handshake | 10/10 | initialize and tools/list both answered. |
| Live MCP endpoint | 25/25 | Endpoint answers the MCP initialize handshake (2228 ms). |
| Protocol revision | 8/10 | Speaks MCP 2025-11-25, 1 revision(s) behind 2026-07-28. |
| Signed descriptor | n/a | No MCP standard defines a signed server descriptor. |
| Uptime (30 days) | 15/15 | 30/30 probes succeeded over 30 days (100%). |
| Tool declaration | 10/10 | Lists 4 tool(s) with descriptions. |
| Verified identity | 5/10 | Publisher declared (repository, package or homepage); claim this listing to verify domain control. |
| Freshness + modern flags | 0/5 | not seen in a source for over 30 days. |
| Auth declaration | 2/5 | Declares credential scheme: smithery_api_key. |
Compared with peers
Against 53,039 reachable MCP servers in our daily snapshot (2026-11-12 06:46 UTC). Display only; it does not change search order.
- Readiness
- Higher than 60% of peers
- This listing 83 · peer median 81
- Latency
- Faster than 10% of peers
- This listing 910 ms · peer median 326 ms
Where it loses the most points, and how to win them back
- Verified identity −5
— Claim the listing and prove control of its domain.
Now: Publisher declared (repository, package or homepage); claim this listing to verify domain control.
- Freshness + modern flags −5
— Keep the listing current in the registry or source it comes from.
Now: not seen in a source for over 30 days.
- Auth declaration −3
— State how to authenticate (an auth scheme, or that none is needed).
Now: Declares credential scheme: smithery_api_key.
Listed in
Directories this entry was found in.
How to connect
https://server.smithery.ai/frankki/letters/mcpcurl -X POST https://server.smithery.ai/frankki/letters/mcp \
-H 'Content-Type: application/json' \
-H 'Accept: application/json, text/event-stream' \
-d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{}}'