laissez 0.0.1a4

Agents spending you can trust

Laissez

Agent spending you can trust.

What you get

• Paid MCP server: Wrap FastMCP tools with create_paid_mcp_app() so every call flows through Laissez billing.
• Paying MCP client: Use LaissezClient as the HTTP transport for MCP agents so they authenticate and settle usage automatically.
• Transparent settlement: Payments are finalized with x402 and appear in the Laissez App dashboard at https://laissez.app.

Set up once

• uv sync --group examples to pull the example dependencies.
• Grab a Laissez API key via the CLI wizard when you first run the examples, or from https://laissez.app.
• Export your OpenAI API key (the client agent calls an OpenAI model).
• Optional: add the keys to a .env; the examples load it with python-dotenv.

Run the paid MCP server

• Command: uv run examples/mcp/paid-mcp-server.py
• What happens: spins up a FastMCP app on http://127.0.0.1:8000, generates a temporary wallet, and exposes paid tools (e.g. roll_die, multiply) behind Laissez enforcement.

Run the paying MCP client

• Ensure the server is live or update BASE_URL in examples/mcp/mcp-client.py to point at your deployment.
• Command: uv run examples/mcp/mcp-client.py
• What happens: creates a pydantic_ai agent backed by LaissezClient, pays for two dice rolls plus a multiply call, and prints the result.

Keep exploring

• See examples/mcp/README.md for a deeper walkthrough of the server and client.
• Tweak prices, add more tools, or swap in different MCP agents to prototype your own billing flows.