> NOTICE — Pre-launch build. Every record here is a dated observation of a real MCP endpoint operated by a third party, rendered from the published archive. Coverage is partial — the figures cover the snapshots in the export this build was made from, not the whole chain and not the whole ecosystem. Claims and badges are not open.

# api.calculator.tools/mcp

Last observed: 2026-10-02T09:06:13.587Z
Recorded as: AUTH_REQUIRED (http_401)
Transport: streamable-http
Observations held: 43
Published: yes

## Observations

| Observed | Snapshot | Recorded as | Detail | Latency ms | Tools | Tool schema fingerprint |
|---|---|---|---|---|---|---|
| 2026-08-21T09:29:49.906Z | REL-SNAP-017 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-22T09:06:20.638Z | REL-SNAP-018 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-23T10:06:56.891Z | REL-SNAP-019 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-24T09:10:13.184Z | REL-SNAP-020 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-25T09:12:16.302Z | REL-SNAP-021 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-26T09:08:44.012Z | REL-SNAP-022 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-27T09:22:30.118Z | REL-SNAP-023 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-28T09:19:24.116Z | REL-SNAP-024 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-29T09:09:26.216Z | REL-SNAP-025 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-30T09:11:34.038Z | REL-SNAP-026 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-08-31T09:14:46.848Z | REL-SNAP-027 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-01T09:09:35.765Z | REL-SNAP-028 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-02T09:15:52.782Z | REL-SNAP-029 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-03T09:37:21.636Z | REL-SNAP-030 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-04T09:28:28.414Z | REL-SNAP-031 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-05T09:13:29.918Z | REL-SNAP-032 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-06T09:22:16.241Z | REL-SNAP-033 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-07T09:42:42.537Z | REL-SNAP-034 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-08T09:34:43.440Z | REL-SNAP-035 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-09T09:21:48.825Z | REL-SNAP-036 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-10T09:15:18.107Z | REL-SNAP-037 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-11T09:14:50.514Z | REL-SNAP-038 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-12T09:06:59.972Z | REL-SNAP-039 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-13T09:34:35.601Z | REL-SNAP-040 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-14T09:34:25.053Z | REL-SNAP-041 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-15T09:27:48.132Z | REL-SNAP-042 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-16T09:52:48.095Z | REL-SNAP-043 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-17T09:35:54.385Z | REL-SNAP-044 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-18T09:26:39.128Z | REL-SNAP-045 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-19T09:12:47.825Z | REL-SNAP-046 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-20T09:28:12.560Z | REL-SNAP-047 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-21T09:09:35.505Z | REL-SNAP-048 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-22T09:24:48.442Z | REL-SNAP-049 | HTTP_5XX | http_500 | - | - | - |
| 2026-09-23T09:45:55.313Z | REL-SNAP-050 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-24T09:41:28.539Z | REL-SNAP-051 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-25T09:38:57.118Z | REL-SNAP-052 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-26T09:15:24.724Z | REL-SNAP-053 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-27T09:28:04.246Z | REL-SNAP-054 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-28T09:42:04.506Z | REL-SNAP-055 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-29T09:29:57.802Z | REL-SNAP-056 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-09-30T09:34:04.798Z | REL-SNAP-057 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-10-01T09:10:14.019Z | REL-SNAP-058 | AUTH_REQUIRED | http_401 | - | - | - |
| 2026-10-02T09:06:13.587Z | REL-SNAP-059 | AUTH_REQUIRED | http_401 | - | - | - |

## Identity

Record key: api.calculator.tools/mcp (the normalised endpoint observed)
Registry names (not anchored — no inclusion proof reaches this field): tools.calculator/mcp (what the registry said when we swept it, as observed by us — not evidence that the registry was correct, that the name belongs to whoever registered it, or that it still resolves)
Name reported by the server: not reported (self-reported, unverified, never used as identity)

Each observation carries a merkle leaf in the snapshot it belongs to. The chain
establishes that a root existed by a given time; it does not establish that any
measurement is true.