# crosscheck (npm · crosscheckapi)

Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install.

- Trust score: 72/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-26

## Components

- remote · `crosscheckapi.com`: 57/100, [markdown](https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi-2.md), [page](https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi-2)
- npm · `crosscheckapi`: 72/100 (this document), [markdown](https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi.md), [page](https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi)

## Channel facts

- Registry: `npm`
- Package: `crosscheckapi`
- Version: `0.5.4`
- 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 2026-09-26.

- **Supply Chain Security**: 100/100
  - No malware found by supply-chain analysis.
  - No known CVEs affecting this package version or its production dependencies.
  - No install/post-install scripts declared.
  - No production dependencies, so there is no dependency health to assess.
- **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 0 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 79/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 661 tokens (~132/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 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.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - All 2 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the crosscheck MCP server?

crosscheck runs locally as an npm package, launched with npx -y crosscheckapi. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add com-crosscheckapi-crosscheck -- npx -y crosscheckapi
```

### Cursor

```json
{
  "mcpServers": {
    "com-crosscheckapi-crosscheck": {
      "command": "npx",
      "args": [
        "-y",
        "crosscheckapi"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-crosscheckapi-crosscheck": {
      "command": "npx",
      "args": [
        "-y",
        "crosscheckapi"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add com-crosscheckapi-crosscheck -- npx -y crosscheckapi
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add com-crosscheckapi-crosscheck --command npx --arg -y --arg crosscheckapi
```

### Hermes

```yaml
mcp_servers:
  com-crosscheckapi-crosscheck:
    command: "npx"
    args: ["-y", "crosscheckapi"]
```

### Netclaw

```json
{
  "McpServers": {
    "com-crosscheckapi-crosscheck": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "crosscheckapi"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-crosscheckapi-crosscheck -t stdio -c npx -a -y crosscheckapi
```

### Other

```json
{
  "mcpServers": {
    "com-crosscheckapi-crosscheck": {
      "command": "npx",
      "args": [
        "-y",
        "crosscheckapi"
      ]
    }
  }
}
```

## 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.

### 2026-09-26 (score 72, +11)

- [security improvement] Known CVEs: unverified → pass
- [functional improvement] Dependency health: unverified → pass

### 2026-09-25 (score 61, +1)

- [functional improvement] Stability: unverified → 0.03
- [functional] Package version: 0.5.1 → 0.5.4
- [functional] Package version: 0.5.1 → 0.5.2
- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-24 (score 60)

First indexed and scored.

## MCP tools (5)

### `quote` (~51 tokens)

Quote a crosscheck review

Free. Returns the price in USDC for an independent review of this draft, and whether reviews are available now.

Input parameters:

- `draft` (string, required): The full text you want checked, exactly as your human would see it

### `order` (~168 tokens)

Order a crosscheck review (paid)

Pays the quoted price (usually $0.02 USDC) from your configured wallet over x402 and returns an independent verdict on the draft: pass, or specific issues with fixes, plus a signed receipt. Use before showing a draft to your human. Pass a Moltbook identity token to use a free check first. If status is pending, call result later with job_id and result_token.

Input parameters:

- `draft` (string, required): The full text you want checked, exactly as your human would see it
- `moltbook_identity` (string): Optional Moltbook identity token (audience crosscheckapi.com) for a free check; each token works once
- `sources` (array): Optional: the text the draft relies on (search results, documents). Each claim is then checked against it.

### `accept` (~213 tokens)

Check work another agent handed back (paid)

Pays about $0.03 USDC from your configured wallet over x402 and checks a deliverable from another agent or service against the task you gave it: accept or reject, each requirement judged (met, not met, partly, or cannot tell), figures, counts, and JSON fields checked in code, plus a signed receipt. Use before you pay for delegated work, release escrow, or pass the result on. If status is pending, call result later with job_id and result_token.

Input parameters:

- `deliverable` (string, required): What came back, exactly as received
- `payment_network` (string): CAIP-2 network of payment_tx, default eip155:8453
- `payment_tx` (string): Optional: the transaction you paid the other agent with; crosscheck verifies it on-chain and binds it to the receipt
- `reference` (string): Optional order id or transaction hash to record on the receipt
- `task` (string, required): The task you gave, with every requirement, exactly as sent

### `skillcheck` (~178 tokens)

Security-check a skill or MCP server before installing it

Reviews an agent skill or MCP server's files before you install or connect it: downloads piped into a shell, credential and wallet reads, secrets sent over the network, persistence, hidden Unicode, and prompt injection aimed at you or at the scanner. The files are read, never run. Checks the free lookup first; pays about $0.03 USDC only when nobody has scanned these exact files. Pass directory (a local folder) or files. Never says safe: no_findings means nothing was found in these files.

Input parameters:

- `directory` (string): Local folder of the skill or server to scan (dependencies and binaries are skipped)
- `files` (array): The files to scan, if you have them in hand instead of a folder
- `fresh` (boolean): Pay for a new scan even if these exact files were scanned before

### `result` (~51 tokens)

Get a crosscheck result

Free. Returns the status, verdict, and verified receipt of an earlier order.

Input parameters:

- `job_id` (string, required): job_id from the order response
- `result_token` (string, required): result_token from the order response

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi#diagnostics

## Score history

- 2026-09-26: 72
- 2026-09-25: 61
- 2026-09-24: 60

## Common questions

### What is the crosscheck MCP server?

crosscheck is an MCP server listed in the public MCP registry as com.crosscheckapi/crosscheck. Checks for AI agents over x402: review drafts, accept-check handoffs, scan skills before install. This page covers its npm package (crosscheckapi).

### Is the crosscheck MCP server safe to use?

crosscheck scores 72 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 26 September 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the crosscheck MCP server expose?

crosscheck exposes 5 tools: quote, order, accept, skillcheck, result. Their descriptions and schemas cost roughly 661 tokens of context every time the server is loaded.

### Is the crosscheck MCP server still maintained?

crosscheck is still listed as active in the MCP registry. We last reached this channel on 26 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What licence is the crosscheck MCP server under?

crosscheck declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.

## Links

- npm package: https://www.npmjs.com/package/crosscheckapi
- Socket report: https://socket.dev/npm/package/crosscheckapi
- Repository: https://github.com/maxugc/crosscheck
- Website: https://crosscheckapi.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi.json
- HTML version of this page: https://verifymcp.io/servers/com-crosscheckapi-crosscheck/crosscheckapi