> 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.

# parabol.usefulapi.io/mcp

Last observed: 2026-08-30T08:53:10.092Z
Recorded as: PROTOCOL_ERROR (post_rejected)
Transport: streamable-http
Observations held: 25
Published: yes

## Observations

| Observed | Snapshot | Recorded as | Detail | Latency ms | Tools | Tool schema fingerprint |
|---|---|---|---|---|---|---|
| 2026-08-06T17:53:19.009Z | REL-SNAP-002 | OK | - | 101 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-07T08:39:28.706Z | REL-SNAP-003 | OK | - | 25 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-08T10:20:51.220Z | REL-SNAP-004 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-09T09:02:10.696Z | REL-SNAP-005 | OK | - | 103 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-10T09:00:09.186Z | REL-SNAP-006 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-11T09:03:41.075Z | REL-SNAP-007 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-12T09:02:20.254Z | REL-SNAP-008 | OK | - | 83 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-13T08:56:09.412Z | REL-SNAP-009 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-14T09:08:31.225Z | REL-SNAP-010 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-15T08:59:09.238Z | REL-SNAP-011 | OK | - | 133 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-16T08:59:43.152Z | REL-SNAP-012 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-17T11:30:39.419Z | REL-SNAP-013 | OK | - | 38 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-18T08:58:15.345Z | REL-SNAP-014 | OK | - | 309 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-19T08:47:36.379Z | REL-SNAP-015 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-20T08:56:05.283Z | REL-SNAP-016 | OK | - | 237 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-21T09:11:49.137Z | REL-SNAP-017 | PROTOCOL_ERROR | post_rejected | - | - | - |
| 2026-08-22T08:48:48.317Z | REL-SNAP-018 | OK | - | 96 | 21 | df8cc30a11677dd34f3e5f0187117f04f23b13a2da26b9aa494b39f3ce81220a |
| 2026-08-23T09:49:51.961Z | REL-SNAP-019 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-24T08:52:08.091Z | REL-SNAP-020 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-25T08:54:06.268Z | REL-SNAP-021 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-26T08:50:25.428Z | REL-SNAP-022 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-27T09:03:10.468Z | REL-SNAP-023 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-28T09:01:09.293Z | REL-SNAP-024 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-29T08:51:16.819Z | REL-SNAP-025 | RATE_LIMITED | http_429 | - | - | - |
| 2026-08-30T08:53:10.092Z | REL-SNAP-026 | PROTOCOL_ERROR | post_rejected | - | - | - |

## Identity

Record key: parabol.usefulapi.io/mcp (the normalised endpoint observed)
Registry names (not anchored — no inclusion proof reaches this field): io.usefulapi/parabol (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.