PPN Hub — public APIs over MCP
REMOTE · MCP.PPN-HUB.COM · SCANNED AUG 3
One MCP endpoint over 69 public PPN APIs: search_apis to discover, execute_api to call. Free tier.
Available components
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score →
Endpoint Security51
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation not fully verified: no authorisation is required to call this server, and 3 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe. See how to fix → View diagnostics → Unverified
- HTTPS not yet verified: we couldn't determine whether a plaintext access path exists. View diagnostics → Unverified
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability58
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 747 tokens (~249/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management27
- Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Add this component to your MCP client. Where a client-specific snippet is available, pick your client below and copy it straight into your config; otherwise use the connection detail shown.
remote · mcp.ppn-hub.com
claude mcp add --transport http com-ppn-hub-ppn-hub https://mcp.ppn-hub.com/mcp
[mcp_servers.com-ppn-hub-ppn-hub] url = "https://mcp.ppn-hub.com/mcp"
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"com-ppn-hub-ppn-hub": {
"type": "remote",
"url": "https://mcp.ppn-hub.com/mcp",
"enabled": true
}
}
} openclaw mcp add com-ppn-hub-ppn-hub --url https://mcp.ppn-hub.com/mcp --transport streamable-http
mcp_servers:
com-ppn-hub-ppn-hub:
url: "https://mcp.ppn-hub.com/mcp" {
"mcpServers": {
"com-ppn-hub-ppn-hub": {
"type": "http",
"url": "https://mcp.ppn-hub.com/mcp"
}
}
} The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 3 Aug 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 23 to 27. That category is still filling its 30-day observation window: 7 days of observed history at the previous scan, 8 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Jul 26 0
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 30 Jul 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Jul 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 27 Jul 26 +1
- We updated how we score, so this day's move reflects our rubric, not a change to the server See what changed → functional
- 26 Jul 26 57
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 3 Aug 2026 · Probed https://mcp.ppn-hub.com/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=ppn-hub.com | CN=WE1,O=Google Trust Services,C=US | 2 Aug 2026 | 31 Oct 2026 | ECDSA 256 | ECDSA-SHA256 | be16fc660a7e20430e9fa2c7e2d88585 |
| SANs: ppn-hub.com, *.ppn-hub.com | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
DNSSEC insecure
Validation of mcp.ppn-hub.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| ppn-hub.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains; preload |
| content-security-policy | default-src 'none'; frame-ancestors 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | geolocation=(), microphone=(), camera=() |
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.ppn-hub.com/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.ppn-hub.com/mcp | Inconclusive | 406 |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability.
environment_brief ~91
Environmental brief for one location: fans out to every public geo-aware API (weather, terrain, environment, …) and returns a merged JSON. Partial results come back with an errors[] list. Requires 'Authorization: Bearer ppn_live_*'.
| Name | Type | Req | Description |
|---|---|---|---|
| lat | number | yes | Latitude |
| lon | number | yes | Longitude |
| place | string | — | Optional human-readable place label (echoed back) |
No output schema declared.
No examples provided.
execute_api ~380
Execute a request against any of the 69 registered APIs. Use search_apis first to find the correct api name and operationId. Requires 'Authorization: Bearer ppn_live_*'.
| Name | Type | Req | Description |
|---|---|---|---|
| api | string | yes | API name: artia, marketo, atmos, chronomap, hydros, lithos, terra, carbon-credit, cost-compare, demand-forecast, grid-connect, site-matching, storage-optimize, tariff-optimize, transmission-loss, car… |
| body | — | — | Request body for POST/PUT/PATCH |
| operationId | string | yes | operationId from search_apis results |
| params | object | — | Query and path parameters as key-value pairs |
No output schema declared.
No examples provided.
search_apis ~276
Search across 449 endpoints in 69 APIs (cultural, earth, energy-calc, green-path, harmonias, hydrogen, internal, nanosnap, natura, platform, sakurahub, science, sim, social, space, stocks). Returns matching endpoints with method, path, summary, parameters, and a ready-to-run example. Use this to discover available API endpoints before calling execute_api. Results carry a "coverage" field (e.g. ["JP"]) for region-limited APIs; use the "region" filter to narrow.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | — | Filter by domain: cultural, earth, energy-calc, green-path, harmonias, hydrogen, internal, nanosnap, natura, platform, sakurahub, science, sim, social, space, stocks |
| limit | number | — | Max results (default: 20) |
| method | string | — | Filter by HTTP method |
| query | string | yes | Search term (matches operationId, summary, description, path, API name, tags; synonyms expanded) |
| region | string | — | Filter by ISO 3166-1 alpha-2 region the API serves data for (e.g. "JP"). Returns region-specific + global APIs; excludes APIs limited to other regions. |
| tag | string | — | Filter by OpenAPI tag |
No output schema declared.
No examples provided.