# io.github.JasonCZMeng/assay (npm · assay-oracle-mcp)

x402 service-quality oracle: check a service's paid-probe quality tier and score before paying it.

- Trust score: 69/100 (medium)
- Change this week: +23
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `assay-oracle-mcp`: 69/100 (this document), [markdown](https://verifymcp.io/servers/jasonczmeng-assay/assay-oracle-mcp.md), [page](https://verifymcp.io/servers/jasonczmeng-assay/assay-oracle-mcp)

## Channel facts

- Registry: `npm`
- Package: `assay-oracle-mcp`
- Version: `0.1.0`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, 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.

- **Supply Chain Security**: 86/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (94 of 98), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (94 of 98), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 14 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 77/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 219 tokens (~73/item across 3 items; 3 tools + 0 resources), lean.
  - 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 jasonczmeng-assay -- npx -y assay-oracle-mcp
```

### Codex

```bash
codex mcp add jasonczmeng-assay -- npx -y assay-oracle-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "jasonczmeng-assay": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "assay-oracle-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add jasonczmeng-assay --command npx --arg -y --arg assay-oracle-mcp
```

### Hermes

```yaml
mcp_servers:
  jasonczmeng-assay:
    command: "npx"
    args: ["-y", "assay-oracle-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "jasonczmeng-assay": {
      "command": "npx",
      "args": [
        "-y",
        "assay-oracle-mcp"
      ]
    }
  }
}
```

## 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.

### 2026-08-02 (score 69, +48)

- [security regression] Provenance: unverified → fail
- [security improvement] Install scripts: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Malware scan: unverified → pass
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Stability: unverified → 0.23
- [functional improvement] Schema quality: unverified → excellent
- [functional improvement] License: unverified → pass
- [functional improvement] Dependency health: unverified → partial
- [functional] Licence: MIT

### 2026-07-31 (score 21, −25)

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

### 2026-07-27 (score 46)

First indexed and scored.

## MCP tools (3)

### `check_service` (~91 tokens)

Check x402 service quality tier

Fast pre-payment check of an x402 service. Returns Assay's quality tier (gold/ok/avoid/unrated) with a one-line verdict, based on real paid probes with on-chain receipts. Use before paying an unfamiliar x402 endpoint. The url must be the service's resource URL exactly as advertised (e.g. in the Bazaar).

Input parameters:

- `url` (string, required): The x402 service resource URL

### `get_score` (~75 tokens)

Get full Assay quality score

Detailed quality report for an x402 service: composite score (0-100), component breakdown (payment settlement, schema conformance, ground-truth accuracy, LLM-judged quality), 7-day trend, and probe count. Backed by real paid probes.

Input parameters:

- `url` (string, required): The x402 service resource URL

### `top_services` (~53 tokens)

List Assay-scored x402 services

Ranked list of x402 services Assay actively probes, best composite score first. Use to find trustworthy paid services. Note: unrated entries are still accumulating probe history.

Input parameters:

- `limit` (integer): Max services to return

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/jasonczmeng-assay/assay-oracle-mcp#diagnostics

## Score history

- 2026-08-03: 69
- 2026-08-02: 69
- 2026-08-01: 21
- 2026-07-31: 21
- 2026-07-30: 46
- 2026-07-28: 46
- 2026-07-27: 46

## Links

- npm package: https://www.npmjs.com/package/assay-oracle-mcp
- Socket report: https://socket.dev/npm/package/assay-oracle-mcp
- Repository: https://github.com/JasonCZMeng/assay
- Changelog RSS feed: https://verifymcp.io/servers/jasonczmeng-assay/assay-oracle-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/jasonczmeng-assay/assay-oracle-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/jasonczmeng-assay/assay-oracle-mcp