# io.github.tang-vu/keryx (npm · keryx-mcp)

Autonomous research agent that pays every source it cites in USDC on Arc via x402 micropayments.

- Trust score: 68/100 (medium)
- Change this week: +44
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- remote · `keryx.cc`: 71/100, [markdown](https://verifymcp.io/servers/tang-vu-keryx/keryx.md), [page](https://verifymcp.io/servers/tang-vu-keryx/keryx)
- npm · `keryx-mcp`: 68/100 (this document), [markdown](https://verifymcp.io/servers/tang-vu-keryx/keryx-mcp.md), [page](https://verifymcp.io/servers/tang-vu-keryx/keryx-mcp)

## Channel facts

- Registry: `npm`
- Package: `keryx-mcp`
- Version: `0.1.1`
- 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**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (111 of 115), 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 (111 of 115), 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 32 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 71/100
  - AI-judged instruction clarity (good).
  - Tool/resource definitions use about 185 tokens (~92/item across 2 items; 2 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 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 tang-vu-keryx -- npx -y keryx-mcp
```

### Codex

```bash
codex mcp add tang-vu-keryx -- npx -y keryx-mcp
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add tang-vu-keryx --command npx --arg -y --arg keryx-mcp
```

### Hermes

```yaml
mcp_servers:
  tang-vu-keryx:
    command: "npx"
    args: ["-y", "keryx-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "tang-vu-keryx": {
      "command": "npx",
      "args": [
        "-y",
        "keryx-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.

### 2026-08-03 (score 68, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-08-02 (score 67, +33)

- [security regression] Provenance: unverified → fail
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Install scripts: unverified → pass
- [security improvement] Malware scan: unverified → pass
- [functional improvement] Stability: unverified → 0.20
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] License: unverified → pass
- [functional] Licence: MIT

### 2026-08-01 (score 34, +29)

- [security] Stability: Stability not yet verified: not enough scan history yet (needs a 30-day window).
- [functional improvement] Tool coverage: unverified → 100
- [functional improvement] MCP protocol: unverified → pass

### 2026-07-31 (score 5, −34)

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

### 2026-07-30 (score 39, −40)

- [security regression] Known CVEs: partial → unverified
- [security regression] Malware scan: pass → unverified
- [security regression] Provenance: fail → unverified
- [security regression] Install scripts: pass → unverified
- [functional regression] License: pass → unverified
- [functional regression] Dependency health: partial → unverified
- [functional regression] Maintenance: pass → unverified
- [functional] Licence: MIT

### 2026-07-28 (score 79, +55)

- [security regression] Provenance: unverified → fail
- [security improvement] Install scripts: unverified → pass
- [security improvement] Known CVEs: unverified → partial
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] License: unverified → pass
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: good
- [functional] First check of Schema quality: pass
- [functional] First check of Schema quality: fail
- [functional] Licence: MIT

### 2026-07-27 (score 24)

First indexed and scored.

## MCP tools (2)

### `ask_keryx` (~132 tokens)

Ask Keryx

Ask Keryx — an autonomous research agent that buys paid sources under a budget, answers with inline citations, and pays each cited creator in USDC on Arc. Costs 0.02 USDC per call, paid from your own funded Arc-testnet wallet (run keryx_wallet_status first to fund it). Use when you want a grounded, source-cited answer AND the creators paid for their work.

Input parameters:

- `budget` (number): Optional USDC budget Keryx may spend buying sources (default ~0.05).
- `question` (string, required): The research question to ask Keryx.

### `keryx_wallet_status` (~53 tokens)

Keryx wallet status

Show the Arc-testnet wallet the Keryx MCP server pays from: address, balances, whether it's ready, and exactly how to fund it via the Circle faucet. Run this before ask_keryx.

## Diagnostics

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

## Score history

- 2026-08-03: 68
- 2026-08-02: 67
- 2026-08-01: 34
- 2026-07-31: 5
- 2026-07-30: 39
- 2026-07-28: 79
- 2026-07-27: 24

## Links

- npm package: https://www.npmjs.com/package/keryx-mcp
- Socket report: https://socket.dev/npm/package/keryx-mcp
- Repository: https://github.com/tang-vu/keryx
- Website: https://keryx.cc/
- Changelog RSS feed: https://verifymcp.io/servers/tang-vu-keryx/keryx-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/tang-vu-keryx/keryx-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/tang-vu-keryx/keryx-mcp