SERVER

x402 Conformance

Rank #6,001

io.github.atsp-protocol/x402-conformance

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

3 versions

2 GitHub stars

by atsp-protocol (1 servers)View repository ↗

First listed

Oct 20, 2026

Last publish date

Oct 25, 2026

PURPOSE

What you can do with x402 Conformance

x402 Conformance is a Model Context Protocol (MCP) server published by atsp-protocol. It ranks #6,001 of 164,500 active servers on MCP Toplist, and its repository has 2 GitHub stars. x402 Conformance is listed on Official MCP, with 3 tracked versions. It was first listed on Oct 20, 2026 and most recently updated on Oct 25, 2026.

Not verifiedMCP Toplist has not yet written a checked profile for this server, so the paragraph above is assembled from registry data only. The repository README is the authority on what it does.

CAPABILITIES AND LIMITATIONS

What x402 Conformance can and cannot do

Not verifiedMCP Toplist has not catalogued this server's tools or limitations. The repository README lists them.

REQUIREMENTS

What you need before using x402 Conformance

DeclaredNo credentialsNo credentials declared

The registry listing declares no required environment variables or authentication. This is declared metadata, not a verified install — the repository README is the authority.

Declared by the Official MCP Registry, last synced Oct 31, 2026. Not independently verified by MCP Toplist.

No runtime, credential or payment requirements are recorded for this server beyond the declaration above.

INSTALLATION AND FIRST TASK

Connect x402 Conformance and confirm it works

npm package

claude mcp add x402-conformance -- npx -y x402-conformance-mcp

Docker image

claude mcp add x402-conformance -- docker run -i --rm ghcr.io/atsp-protocol/x402-conformance:1.6.0

npm package

[mcp_servers.x402-conformance]
command = "npx"
args = ["-y", "x402-conformance-mcp"]

Add to ~/.codex/config.toml.

Docker image

[mcp_servers.x402-conformance]
command = "docker"
args = ["run", "-i", "--rm", "ghcr.io/atsp-protocol/x402-conformance:1.6.0"]

Add to ~/.codex/config.toml.

npm package

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

Add to claude_desktop_config.json (Settings → Developer → Edit Config).

Docker image

{
  "mcpServers": {
    "x402-conformance": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/atsp-protocol/x402-conformance:1.6.0"
      ]
    }
  }
}

Add to claude_desktop_config.json (Settings → Developer → Edit Config).

npm package

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

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project).

Docker image

{
  "mcpServers": {
    "x402-conformance": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/atsp-protocol/x402-conformance:1.6.0"
      ]
    }
  }
}

Add to ~/.cursor/mcp.json (global) or .cursor/mcp.json (per project).

npm package

{
  "servers": {
    "x402-conformance": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}

Save as .vscode/mcp.json in your workspace.

Docker image

{
  "servers": {
    "x402-conformance": {
      "type": "stdio",
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/atsp-protocol/x402-conformance:1.6.0"
      ]
    }
  }
}

Save as .vscode/mcp.json in your workspace.

npm package

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

Add to ~/.codeium/windsurf/mcp_config.json.

Docker image

{
  "mcpServers": {
    "x402-conformance": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/atsp-protocol/x402-conformance:1.6.0"
      ]
    }
  }
}

Add to ~/.codeium/windsurf/mcp_config.json.

npm package

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

Docker image

{
  "mcpServers": {
    "x402-conformance": {
      "command": "docker",
      "args": [
        "run",
        "-i",
        "--rm",
        "ghcr.io/atsp-protocol/x402-conformance:1.6.0"
      ]
    }
  }
}

First successful task

After adding the config, ask your client to list this server's tools. A tool list confirms the connection; an empty list or an error means the server did not start or needs credentials.

MAINTENANCE AND EVIDENCE

What changed, and when this was checked

First listed: Oct 20, 2026
Latest version published: Oct 25, 2026
Version history: 3 versions tracked (below)
Requirements evidence: Declared by the Official MCP Registry, last synced Oct 31, 2026. Not independently verified by MCP Toplist.
Profile checked: Not yet — purpose, capabilities and requirements above come from registry data only
Ranking data as of: Oct 25, 2026

Registry sightings

Official MCP ↗listed since Oct 23, 2026 · still listed

Do you maintain x402 Conformance? to correct or enrich this profile.

VERSIONS

Available versions (3)

Version	Published
1.6.0	Oct 25, 2026
1.5.0	Oct 23, 2026
1.4.0	Oct 23, 2026

STANDING

#6,001of 164,500 active serversTop 5%

Ranks ahead of 158,499 of 164,500 servers on MCP Toplist.

BADGE

Show your rank

Maintain this server? Add the live rank badge to your README — it updates automatically as the leaderboard changes.

Markdown

[![MCP Toplist](https://mcptoplist.com/badge/io.github.atsp-protocol%2Fx402-conformance.svg)](https://mcptoplist.com/server/io.github.atsp-protocol%2Fx402-conformance)

HTML

<a href="https://mcptoplist.com/server/io.github.atsp-protocol%2Fx402-conformance"><img src="https://mcptoplist.com/badge/io.github.atsp-protocol%2Fx402-conformance.svg" alt="MCP Toplist: Top 5% of 164,500" /></a>

Variants: append ?metric=score or ?metric=stars to the image URL.

FAQ

Frequently asked questions

Who maintains x402 Conformance?: x402 Conformance is maintained by atsp-protocol, which publishes 1 MCP server (3 total versions) tracked on MCP Toplist.
Is x402 Conformance listed on the Official MCP Registry?: Yes — x402 Conformance is listed on the Official MCP Registry.
How many versions does x402 Conformance have?: MCP Toplist tracks 3 versions of x402 Conformance, most recently published on Oct 25, 2026.
Where can I find the source code for x402 Conformance?: The source code for x402 Conformance is hosted at github.com/atsp-protocol/x402-conformance.

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