com.loopxxi/loop-mcp
loop-mcp
15 pay-per-call Bitcoin and developer tools, paid in sats over Lightning (L402).
alive probed 2026-10-08 · HTTP 200
15tools
2.8ktokens in Claude Opus 5.5
2.9ktokens in Claude Code
1.4 %of a 200k context window
1.5ko200k_base estimate
643 msto initialize
30 msto list tools
- Endpoint
- https://mcp.loopxxi.com/mcp (streamable-http)
- Host
- mcp.loopxxi.com
- Protocol
- 2024-11-05
- Reports itself as
- loop-mcp 2.4.0
- Capabilities
- tools
- Instructions
- none
- Claude count
- Claude Opus 5.5, measured 2026-10-08. Counted again when the tool definitions change. Method.
- Website
- https://mcp.loopxxi.com
- Registry
- active, updated 2026-10-08 · registry entry
- Reachable
- 1 of the last 6 probes
Most expensive tools
| Tool | Tokens (o200k) | Share of this server |
|---|---|---|
| optimal_send_window | 200 | 13 % |
| btc_send_decision | 143 | 10 % |
| tx_decode_explain | 140 | 9 % |
| csv_to_json | 138 | 9 % |
| lightning_address_resolve | 116 | 8 % |
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-08 11:04 | alive | 643 ms | 15 | 2.8k | 1.5k |
| 2026-10-05 00:17 | not found | ||||
| 2026-10-04 09:56 | not found | ||||
| 2026-10-04 07:50 | not found | ||||
| 2026-10-03 20:30 | not found | ||||
| 2026-10-03 17:48 | not found |
Badge and feed
[](https://mcpcost.ulehla.dev/s/com.loopxxi/loop-mcp)
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.