# x402 Conformance (npm · x402-conformance-mcp)

x402 payment safety checks: validate a 402 answer, prove a server never serves before settlement.

- Trust score: 39/100 (low)
- Change this week: 0
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-05

## Components

- npm · `x402-conformance-mcp`: 39/100 (this document), [markdown](https://verifymcp.io/servers/atsp-protocol-x402-conformance/x402-conformance-mcp.md), [page](https://verifymcp.io/servers/atsp-protocol-x402-conformance/x402-conformance-mcp)
- oci · `ghcr.io/atsp-protocol/x402-conformance`: 44/100, [markdown](https://verifymcp.io/servers/atsp-protocol-x402-conformance/ghcr-io-atsp-protocol-x402-conformance.md), [page](https://verifymcp.io/servers/atsp-protocol-x402-conformance/ghcr-io-atsp-protocol-x402-conformance)

## Channel facts

- Registry: `npm`
- Package: `x402-conformance-mcp`
- Version: `1.6.0`
- 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 2026-11-05.

- **Supply Chain Security**: 98/100
  - No malware found by supply-chain analysis.
  - Known CVEs were checked across the 93 of 94 dependencies we could resolve, so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Dependency health was assessed across the 93 of 94 dependencies we could resolve, so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 48/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (Apache-2.0).
  - Actively maintained (last published 11 days ago).
  - Publishes a security disclosure policy (SECURITY.md).
- **Schema Quality & AI Usability**: 0/100
  - Schema quality not yet verified: this package could not be installed in a clean environment, so we have no schema to assess.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: this package could not be installed in a clean environment, so we have no schema to compare.
- **Tool Coverage**: 0/100
  - Tool coverage not yet verified: this package could not be installed in a clean environment, so we have no tool definitions to assess.
- **Tool Safety**: 0/100
  - Tool safety not yet verified: this package could not be installed in a clean environment, so we have no tool text to scan.
- **Capabilities**: 0/100
  - Protocol version not yet verified: this package could not be installed in a clean environment, so we never saw its MCP handshake.

**Unverified: 5 categories.** Categories scored 0 because our sandbox has not given us the schema these checks need to read. That is a gap on our side rather than a finding about the package, and we only credit what we can confirm, so the score stands at 0 until the capture succeeds. We are working through the fleet, so this normally clears without any action from you.

## Install

### How do I install the x402 Conformance MCP server?

x402 Conformance runs locally as an npm package, launched with npx -y x402-conformance-mcp. 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 atsp-protocol-x402-conformance -- npx -y x402-conformance-mcp
```

### Cursor

```json
{
  "mcpServers": {
    "atsp-protocol-x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "atsp-protocol-x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
```

### Codex

```bash
codex mcp add atsp-protocol-x402-conformance -- npx -y x402-conformance-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "atsp-protocol-x402-conformance": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "x402-conformance-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add atsp-protocol-x402-conformance --command npx --arg -y --arg x402-conformance-mcp
```

### Hermes

```yaml
mcp_servers:
  atsp-protocol-x402-conformance:
    command: "npx"
    args: ["-y", "x402-conformance-mcp"]
```

### Netclaw

```json
{
  "McpServers": {
    "atsp-protocol-x402-conformance": {
      "Transport": "stdio",
      "Command": "npx",
      "Arguments": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
```

### Vellum

```bash
assistant mcp add atsp-protocol-x402-conformance -t stdio -c npx -a -y x402-conformance-mcp
```

### Other

```json
{
  "mcpServers": {
    "atsp-protocol-x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-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.

### 2026-11-04 (score 39, 0)

- [functional] Package version: 1.5.0 → 1.6.0

### 2026-11-02 (score 39, 0)

- [functional] Package version: 1.5.0 → 1.6.0

### 2026-10-31 (score 39, 0)

- [functional] Package version: 1.5.0 → 1.6.0

### 2026-10-29 (score 39, 0)

- [functional] Package version: 1.5.0 → 1.6.0

### 2026-10-28 (score 39, 0)

- [functional] Package version: 1.5.0 → 1.6.0

### 2026-10-26 (score 39, +15)

- [security improvement] Malware scan: unverified → pass
- [functional] Package version: 1.5.0 → 1.6.0

### 2026-10-25 (score 24, −27)

- [security regression] Stability: 0.03 → unverified
- [security regression] Tool safety: pass → unverified
- [security improvement] CVE-2023-54404 no longer affects this package
- [security improvement] Known CVEs: fail → partial
- [functional regression] Tool coverage: 100 → unverified
- [functional regression] Capabilities: pass → unverified
- [functional] First check of Schema quality: unverified
- [functional] Dependency health: 0.86 → partial
- [functional] Package version: 1.5.0 → 1.6.0

### 2026-10-24 (score 51, −2)

- [security regression] CVE-2023-54404 affects this package: high
- [security regression] Known CVEs: pass → fail
- [functional improvement] Stability: unverified → 0.03
- [functional] Package version: 1.4.0 → 1.5.0

## MCP tools (0)

Tools for package channels are captured by running the package in an isolated sandbox. The most recent sandbox run could not capture a tool list from this package.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/atsp-protocol-x402-conformance/x402-conformance-mcp#diagnostics

## Score history

- 2026-11-05: 39
- 2026-11-04: 39
- 2026-11-03: 39
- 2026-11-02: 39
- 2026-11-01: 39
- 2026-10-31: 39
- 2026-10-30: 39
- 2026-10-29: 39
- 2026-10-28: 39
- 2026-10-27: 39
- 2026-10-26: 39
- 2026-10-25: 24
- 2026-10-24: 51
- 2026-10-23: 53

## Common questions

### What is the x402 Conformance MCP server?

x402 Conformance is an MCP server listed in the public MCP registry as io.github.atsp-protocol/x402-conformance. x402 payment safety checks: validate a 402 answer, prove a server never serves before settlement. This page covers its npm package (x402-conformance-mcp).

### Is the x402 Conformance MCP server safe to use?

x402 Conformance scores 39 out of 100 on VerifyMCP. 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.

### Is the x402 Conformance MCP server still maintained?

x402 Conformance is still listed as active in the MCP registry. We last reached this channel on 5 November 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 x402 Conformance MCP server under?

x402 Conformance declares the Apache-2.0 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/x402-conformance-mcp
- Socket report: https://socket.dev/npm/package/x402-conformance-mcp
- Repository: https://github.com/atsp-protocol/x402-conformance
- Website: https://github.com/atsp-protocol/x402-conformance/blob/main/docs/USING.md
- Changelog RSS feed: https://verifymcp.io/servers/atsp-protocol-x402-conformance/x402-conformance-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/atsp-protocol-x402-conformance/x402-conformance-mcp.json
- HTML version of this page: https://verifymcp.io/servers/atsp-protocol-x402-conformance/x402-conformance-mcp