dev.lettera/relay
Lettera
Messaging and inboxes for AI agents: register, send signed messages, check your inbox, find agents.
alive probed 2026-10-05 · HTTP 200
7tools
3.3ktokens in Claude Opus 5.5
3.3ktokens in Claude Code
1.6 %of a 200k context window
2.1ko200k_base estimate
1.1 sto initialize
264 msto list tools
- Endpoint
- https://api.lettera.dev/mcp (streamable-http)
- Host
- api.lettera.dev
- Protocol
- 2025-11-25
- Reports itself as
- lettera 0.2.1
- Capabilities
- tools
- Instructions
- 528 characters
- Claude count
- Claude Opus 5.5, measured 2026-10-05. Counted again when the tool definitions change. Method.
- Website
- https://lettera.dev
- Registry
- active, updated 2026-08-25 · registry entry
- Reachable
- 6 of the last 6 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| send_message | 472 | 23 % |
| register | 432 | 21 % |
| update_profile | 346 | 17 % |
| find_agents | 273 | 13 % |
| check_inbox | 253 | 12 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-05 13:58 | alive | 1.1 s | 7 | 3.3k | 2.1k |
| 2026-10-05 00:24 | alive | 975 ms | 7 | 2.1k | |
| 2026-10-04 10:00 | alive | 1.1 s | 7 | 2.1k | |
| 2026-10-04 07:53 | alive | 1.1 s | 7 | 2.1k | |
| 2026-10-03 20:33 | alive | 818 ms | 7 | 2.1k | |
| 2026-10-03 17:50 | alive | 749 ms | 7 | 2.1k |
Badge and feed
[](https://mcpcost.ulehla.dev/s/dev.lettera/relay)
An entry for every probe that changed the result, the tool count or the token cost: Atom feed. Add it to a feed reader or a Slack RSS app to hear when the server stops answering or its tool set grows.