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x402 Conformance

io.github.atsp-protocol/x402-conformance v1.4.0
Official Registry git finance
Repository

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

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Install connect locally via stdio

Run in your terminal 
claude mcp add x402-conformance -- npx -y x402-conformance-mcp
Add to claude_desktop_config.json 
{
  "mcpServers": {
    "x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
Add to ~/.cursor/mcp.json 
{
  "mcpServers": {
    "x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
Add to Cursor →
Add to ~/.codeium/windsurf/mcp_config.json 
{
  "mcpServers": {
    "x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
Add to .vscode/mcp.json 
{
  "servers": {
    "x402-conformance": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}
Add to VS Code →
Add to cline_mcp_settings.json 
{
  "mcpServers": {
    "x402-conformance": {
      "command": "npx",
      "args": [
        "-y",
        "x402-conformance-mcp"
      ]
    }
  }
}

Packages

npm x402-conformance-mcp@1.4.0
oci ghcr.io/atsp-protocol/x402-conformance:1.4.0

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