Polymarket MCP Server

Instructions

Implementation Reference

• src/tools/clob/tick-size.ts:6-23 (registration)

  Registration of the get_tick_size tool.

  server.tool(
    "get_tick_size",
    "Get the minimum tick size (price increment) for a Polymarket token.",
    {
      token_id: z.string().describe("CLOB token ID"),
    },
    async (args) => {
      try {
        const data = await clob.getTickSize(args.token_id);
        return { content: [{ type: "text", text: JSON.stringify(data, null, 2) }] };
      } catch (error) {
        return {
          content: [{ type: "text", text: `Error: ${(error as Error).message}` }],
          isError: true,
        };
      }
    },
  );

• src/api/clob.ts:74-78 (handler)

  Handler implementation for get_tick_size in the ClobApi class.

  async getTickSize(tokenId: string): Promise<ClobTickSize> {
    return this.client.clob<ClobTickSize>("/tick-size", {
      token_id: tokenId,
    });
  }