MCP

In development

This adapter is being implemented against the core v2 contract. The example below shows the intended shape and may change.

server.ts

import { McpServer } from "@modelcontextprotocol/sdk/server/mcp.js";
import { withTollstile } from "@tollstile/mcp";
import { toll } from "./toll";

const server = withTollstile(new McpServer({ name: "images", version: "1.0.0" }), toll);

server.tool("generate_image", toll.price("$0.04"), async (input, { payment }) => {
  return generateImage(input);
});

Free tools stay free: only tools registered with a price are guarded.

Metered tools

For tools whose cost is known only after they run, authorize a ceiling and settle what was used.

server.tool(
  "render_video",
  toll.price(upTo("$0.50")),
  async (input, { payment }) => {
    const video = await render(input);
    await payment.fulfill({ amount: costOf(video) });
    return video;
  },
);

Metered tools

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