# Gembook — PSA Vintage Pokémon Prices & Pop (remote · gembook.xyz)

Neutral prices + PSA population for PSA-graded vintage Pokémon (WotC 1999–2003). Read-only.

- Trust score: 76/100 (medium)
- Change this week: +7
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `gembook.xyz`: 76/100 (this document), [markdown](https://verifymcp.io/servers/xyz-gembook-gembook/api-mcp-mcp.md), [page](https://verifymcp.io/servers/xyz-gembook-gembook/api-mcp-mcp)

## Channel facts

- Endpoint: `https://gembook.xyz/api/mcp/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 460 tokens (~153/item across 3 items; 3 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 27/100
  - Stability observed for 8 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add --transport http xyz-gembook-gembook https://gembook.xyz/api/mcp/mcp
```

### Codex

```toml
[mcp_servers.xyz-gembook-gembook]
url = "https://gembook.xyz/api/mcp/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "xyz-gembook-gembook": {
      "type": "remote",
      "url": "https://gembook.xyz/api/mcp/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add xyz-gembook-gembook --url https://gembook.xyz/api/mcp/mcp --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  xyz-gembook-gembook:
    url: "https://gembook.xyz/api/mcp/mcp"
```

### Other

```json
{
  "mcpServers": {
    "xyz-gembook-gembook": {
      "type": "http",
      "url": "https://gembook.xyz/api/mcp/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-03 (score 76, +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.

### 2026-08-01 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 17 to 20. That category is still filling its 30-day observation window: 5 days of observed history at the previous scan, 6 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-07-31 (score 74, +3)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 71, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-28 (score 70, +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.

### 2026-07-27 (score 69, +1)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-26 (score 68)

First indexed and scored.

## MCP tools (3)

### `lookup_card_price` (~197 tokens)

Look up a PSA-graded vintage Pokémon card's market value

Get Gembook's fair-value estimate (USD) for a PSA-graded vintage Pokémon card (WotC era, Base Set through Skyridge, 1999–2003). Returns fair value, range, confidence tier, comp count, and the card page URL. Call this when a user asks what a vintage Pokémon card is worth or whether a price is fair. Scope is PSA-graded vintage Pokémon ONLY — other graders, eras, or TCGs are out of scope.

Input parameters:

- `card_name` (string, required): Card name, e.g. 'Charizard'
- `grade` (integer): PSA grade 1–10
- `set_name` (string): Set name to narrow, e.g. 'Base', 'Jungle', 'Neo Genesis'
- `variant` (string): Edition/variant to narrow, e.g. '1st Edition', 'Shadowless', 'Unlimited', 'Reverse Holo'

### `lookup_pop_report` (~129 tokens)

Look up a card's PSA population report

Get the PSA population (number of slabs graded per grade) for a vintage Pokémon card across all grades. Call this when a user asks how rare a PSA grade is for a card. Scope: PSA-graded vintage Pokémon (Base Set through Skyridge).

Input parameters:

- `card_name` (string, required): Card name, e.g. 'Blastoise'
- `set_name` (string): Set name to narrow, e.g. 'Base'
- `variant` (string): Edition/variant to narrow, e.g. '1st Edition', 'Shadowless', 'Unlimited', 'Reverse Holo'

### `get_methodology_summary` (~56 tokens)

How Gembook computes card prices

Returns a short summary of Gembook's valuation + trust methodology (what counts as a verified sale, confidence tiers, published error rates). Call this when a user asks how the prices are computed or whether they can be trusted.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/xyz-gembook-gembook/api-mcp-mcp#diagnostics

## Score history

- 2026-08-03: 76
- 2026-08-02: 75
- 2026-08-01: 75
- 2026-07-31: 74
- 2026-07-30: 71
- 2026-07-29: 70
- 2026-07-28: 70
- 2026-07-27: 69
- 2026-07-26: 68

## Links

- Remote endpoint: https://gembook.xyz/api/mcp/mcp
- Website: https://gembook.xyz/
- Changelog RSS feed: https://verifymcp.io/servers/xyz-gembook-gembook/api-mcp-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/xyz-gembook-gembook/api-mcp-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/xyz-gembook-gembook/api-mcp-mcp