Prompt Claude. Hardware executes.

The intended loop

You type “Move the car forward two seconds” or “Purchase the soil-moisture reading from greenhouse #4.” The agent discovers the public contract, presents an x402 client, USDC clears on Base (or Solana), and the MCU wrapped function runs. That is the product: inference → settlement → GPIO, with no remote in the operator's hand.

Why a wrapper

Chat models call HTTP tools. They cannot sign crypto. Unmetered (FREE) services work with a plain HTTP tool. Paid services need a process that holds a funded wallet and performs the x402 pay-and-retry. The model never sees the private key.

Unmetered discovery + free services

Register two HTTP tools / Custom GPT Actions — no wallet:

• GET https://device-controller.0xbs.org/public/device/{deviceId} — contract
• POST https://device-controller.0xbs.org/quote/device/{deviceId}/service/{serviceId} — invoke

Claude — MCP

Install the 0xBS MCP server locally. Claude Desktop starts it. Ask it to create a payment wallet — keys stay on disk at ~/.0xbs/wallet.json; Claude only sees public addresses. Fund those addresses with USDC, then prompt.

1. Build services/mcp-server (npm install && npm run build).
2. Point Claude Desktop at services/mcp-server/dist/index.js (absolute path) in claude_desktop_config.json, then fully quit and reopen Claude.
3. In chat: “Create a 0xBS payment wallet and show me the addresses to fund.”
4. After funding: “Find online 0xBS devices and move the car forward.”

{  "mcpServers": {    "0xbs-devices": {      "command": "node",      "args": ["/absolute/path/to/0xbs/services/mcp-server/dist/index.js"]    }  }}

Free services work immediately. Paid services settle from that wallet against https://device-controller.0xbs.org. Later, “generate a fresh Base keypair” or “generate a fresh Solana keypair” rotates only that chain. The old address is retired; funds do not move.

ChatGPT — Custom GPT Action

Host the same wrapper behind a public URL and register it as an Action. The Action backend holds the wallet key and performs the x402 flow; the GPT only passes deviceId, serviceId, params.

Agent frameworks

Coinbase AgentKit, LangChain/LangGraph, and similar already ship x402 tools. Give the agent a funded wallet and point its x402 tool at the call URL — the model can settle autonomously and drive physical services.