LANGCHAIN · LANGGRAPH · MCP · X402

Give a LangChain agent a machine-commerce tool layer.

Use SCRIPTMASTERLABS as an MCP capability source. Discovery can stay free; paid execution remains behind your agent's explicit wallet and spend-policy boundary.

1. Run the MCP server locally

npx @scriptmasterlabs/mcp-x402

Or point an MCP-capable bridge at the remote endpoint:

https://squeezeos-api.onrender.com/mcp

2. Standard MCP client config

{
  "mcpServers": {
    "scriptmasterlabs": {
      "command": "npx",
      "args": ["-y", "@scriptmasterlabs/mcp-x402"]
    }
  }
}

3. Put policy before payment

Recommended graph: intent → discover tool → inspect live price → policy check → sign exact x402 requirement → retry → require settlement evidence → accept result.

4. Test the rail without pretending payment happened

Get a real 402 Check readiness Settlement evidence

Truth rule: HTTP 402 is a payment requirement, not proof of payment. A signed authorization is not settlement. Accept the paid tool result only after authoritative settlement/delivery evidence.

Open interactive x402 console →