diff --git a/internal/bundb/group.go b/internal/bundb/group.go
index 306ea8a..38312a7 100644
--- a/internal/bundb/group.go
+++ b/internal/bundb/group.go
@@ -79,12 +79,35 @@ func (g *Group) List(ctx context.Context, params domain.ListGroupsParams) ([]dom
 	}
 
 	result := make([]domain.Group, 0, len(groups))
-	for _, version := range groups {
-		result = append(result, version.ToDomain())
+	for _, group := range groups {
+		result = append(result, group.ToDomain())
 	}
+
 	return result, nil
 }
 
+func (g *Group) Get(ctx context.Context, id, serverID string) (domain.Group, error) {
+	if _, err := uuid.Parse(id); err != nil {
+		return domain.Group{}, domain.GroupNotFoundError{ID: id}
+	}
+
+	var group model.Group
+
+	err := g.db.NewSelect().
+		Model(&group).
+		Where("id = ?", id).
+		Where("server_id = ?", serverID).
+		Scan(ctx)
+	if err != nil {
+		if errors.Is(err, sql.ErrNoRows) {
+			return domain.Group{}, domain.GroupNotFoundError{ID: id}
+		}
+		return domain.Group{}, fmt.Errorf("couldn't select group (id=%s,serverID=%s) from the db: %w", id, serverID, err)
+	}
+
+	return group.ToDomain(), nil
+}
+
 func (g *Group) Delete(ctx context.Context, id, serverID string) error {
 	if _, err := uuid.Parse(id); err != nil {
 		return domain.GroupNotFoundError{ID: id}
diff --git a/internal/bundb/group_test.go b/internal/bundb/group_test.go
index 737ff29..462ff14 100644
--- a/internal/bundb/group_test.go
+++ b/internal/bundb/group_test.go
@@ -80,45 +80,47 @@ func TestGroup_Update(t *testing.T) {
 		assert.Zero(t, updatedGroup)
 	})
 
-	t.Run("ERR: invalid UUID", func(t *testing.T) {
+	t.Run("ERR: group not found", func(t *testing.T) {
 		t.Parallel()
 
-		id := "12345"
-		updatedGroup, err := repo.Update(context.Background(), id, "", domain.UpdateGroupParams{
-			ChannelGains: domain.NullString{
-				String: "update",
-				Valid:  true,
+		tests := []struct {
+			name     string
+			id       string
+			serverID string
+		}{
+			{
+				name:     "ID - not UUID",
+				id:       "test",
+				serverID: group.ServerID,
 			},
-		})
-		assert.ErrorIs(t, err, domain.GroupNotFoundError{ID: id})
-		assert.Zero(t, updatedGroup)
-	})
-
-	t.Run("ERR: group not found (unknown ID)", func(t *testing.T) {
-		t.Parallel()
-
-		id := uuid.NewString()
-		updatedGroup, err := repo.Update(context.Background(), id, group.ServerID, domain.UpdateGroupParams{
-			ChannelGains: domain.NullString{
-				String: "update",
-				Valid:  true,
+			{
+				name:     "ID - random UUID",
+				id:       uuid.NewString(),
+				serverID: group.ServerID,
 			},
-		})
-		assert.ErrorIs(t, err, domain.GroupNotFoundError{ID: id})
-		assert.Zero(t, updatedGroup)
-	})
-
-	t.Run("ERR: group not found (unknown ServerID)", func(t *testing.T) {
-		t.Parallel()
-
-		updatedGroup, err := repo.Update(context.Background(), group.ID.String(), uuid.NewString(), domain.UpdateGroupParams{
-			ChannelGains: domain.NullString{
-				String: "update",
-				Valid:  true,
+			{
+				name:     "ServerID - random UUID",
+				id:       group.ID.String(),
+				serverID: uuid.NewString(),
 			},
-		})
-		assert.ErrorIs(t, err, domain.GroupNotFoundError{ID: group.ID.String()})
-		assert.Zero(t, updatedGroup)
+		}
+
+		for _, tt := range tests {
+			tt := tt
+
+			t.Run(tt.name, func(t *testing.T) {
+				t.Parallel()
+
+				updatedGroup, err := repo.Update(context.Background(), tt.id, tt.serverID, domain.UpdateGroupParams{
+					ChannelGains: domain.NullString{
+						String: "update",
+						Valid:  true,
+					},
+				})
+				assert.ErrorIs(t, err, domain.GroupNotFoundError{ID: tt.id})
+				assert.Zero(t, updatedGroup)
+			})
+		}
 	})
 }
 
@@ -180,6 +182,58 @@ func TestGroup_List(t *testing.T) {
 	}
 }
 
+func TestGroup_Get(t *testing.T) {
+	t.Parallel()
+
+	db := newDB(t)
+	fixture := loadFixtures(t, db)
+	repo := bundb.NewGroup(db)
+	group := getGroupFromFixture(t, fixture, "group-server-1-1")
+
+	t.Run("OK", func(t *testing.T) {
+		t.Parallel()
+
+	})
+
+	t.Run("ERR: group not found (unknown ID)", func(t *testing.T) {
+		t.Parallel()
+
+		tests := []struct {
+			name     string
+			id       string
+			serverID string
+		}{
+			{
+				name:     "ID - not UUID",
+				id:       "test",
+				serverID: group.ServerID,
+			},
+			{
+				name:     "ID - random UUID",
+				id:       uuid.NewString(),
+				serverID: group.ServerID,
+			},
+			{
+				name:     "ServerID - random UUID",
+				id:       group.ID.String(),
+				serverID: uuid.NewString(),
+			},
+		}
+
+		for _, tt := range tests {
+			tt := tt
+
+			t.Run(tt.name, func(t *testing.T) {
+				t.Parallel()
+
+				g, err := repo.Get(context.Background(), tt.id, tt.serverID)
+				assert.ErrorIs(t, err, domain.GroupNotFoundError{ID: tt.id})
+				assert.Zero(t, g)
+			})
+		}
+	})
+}
+
 func TestGroup_Delete(t *testing.T) {
 	t.Parallel()
 
@@ -200,32 +254,44 @@ func TestGroup_Delete(t *testing.T) {
 		assert.Len(t, groups, 0)
 	})
 
-	t.Run("ERR: invalid UUID", func(t *testing.T) {
+	t.Run("ERR: group not found", func(t *testing.T) {
 		t.Parallel()
 
-		id := "12345"
-		assert.ErrorIs(t, repo.Delete(context.Background(), id, ""), domain.GroupNotFoundError{ID: id})
-	})
+		tests := []struct {
+			name     string
+			id       string
+			serverID string
+		}{
+			{
+				name:     "ID - not UUID",
+				id:       "test",
+				serverID: group.ServerID,
+			},
+			{
+				name:     "ID - random UUID",
+				id:       uuid.NewString(),
+				serverID: group.ServerID,
+			},
+			{
+				name:     "ServerID - random UUID",
+				id:       group.ID.String(),
+				serverID: uuid.NewString(),
+			},
+		}
 
-	t.Run("ERR: group not found (unknown ID)", func(t *testing.T) {
-		t.Parallel()
+		for _, tt := range tests {
+			tt := tt
 
-		id := uuid.NewString()
-		assert.ErrorIs(
-			t,
-			repo.Delete(context.Background(), id, group.ServerID),
-			domain.GroupNotFoundError{ID: id},
-		)
-	})
+			t.Run(tt.name, func(t *testing.T) {
+				t.Parallel()
 
-	t.Run("ERR: group not found (unknown ServerID)", func(t *testing.T) {
-		t.Parallel()
-
-		assert.ErrorIs(
-			t,
-			repo.Delete(context.Background(), group.ID.String(), uuid.NewString()),
-			domain.GroupNotFoundError{ID: group.ID.String()},
-		)
+				assert.ErrorIs(
+					t,
+					repo.Delete(context.Background(), tt.id, tt.serverID),
+					domain.GroupNotFoundError{ID: tt.id},
+				)
+			})
+		}
 	})
 }
 
diff --git a/internal/bundb/monitor.go b/internal/bundb/monitor.go
index f33b656..af3c0e4 100644
--- a/internal/bundb/monitor.go
+++ b/internal/bundb/monitor.go
@@ -2,6 +2,7 @@ package bundb
 
 import (
 	"context"
+	"database/sql"
 	"errors"
 	"fmt"
 
@@ -47,6 +48,29 @@ func (m *Monitor) Create(ctx context.Context, params domain.CreateMonitorParams)
 	return monitor.ToDomain(), nil
 }
 
+func (m *Monitor) List(ctx context.Context, groupID string) ([]domain.Monitor, error) {
+	if _, err := uuid.Parse(groupID); err != nil {
+		return nil, nil
+	}
+
+	var monitors []model.Monitor
+
+	if err := m.db.NewSelect().
+		Model(&monitors).
+		Order("created_at ASC").
+		Where("group_id = ?", groupID).
+		Scan(ctx); err != nil && !errors.Is(err, sql.ErrNoRows) {
+		return nil, fmt.Errorf("couldn't select monitors from the db: %w", err)
+	}
+
+	result := make([]domain.Monitor, 0, len(monitors))
+	for _, monitor := range monitors {
+		result = append(result, monitor.ToDomain())
+	}
+
+	return result, nil
+}
+
 func mapCreateMonitorError(err error, params domain.CreateMonitorParams) error {
 	var pgError pgdriver.Error
 	if !errors.As(err, &pgError) {
diff --git a/internal/service/group.go b/internal/service/group.go
index 89625a5..85cabdd 100644
--- a/internal/service/group.go
+++ b/internal/service/group.go
@@ -18,6 +18,7 @@ type GroupRepository interface {
 	Create(ctx context.Context, params domain.CreateGroupParams) (domain.Group, error)
 	Update(ctx context.Context, id, serverID string, params domain.UpdateGroupParams) (domain.Group, error)
 	List(ctx context.Context, params domain.ListGroupsParams) ([]domain.Group, error)
+	Get(ctx context.Context, id, serverID string) (domain.Group, error)
 	Delete(ctx context.Context, id, serverID string) error
 }
 
@@ -91,6 +92,14 @@ func (g *Group) List(ctx context.Context, params domain.ListGroupsParams) ([]dom
 	return groups, nil
 }
 
+func (g *Group) Get(ctx context.Context, id, serverID string) (domain.Group, error) {
+	group, err := g.repo.Get(ctx, id, serverID)
+	if err != nil {
+		return domain.Group{}, fmt.Errorf("GroupRepository.Get: %w", err)
+	}
+	return group, nil
+}
+
 func (g *Group) Delete(ctx context.Context, id, serverID string) error {
 	if err := g.repo.Delete(ctx, id, serverID); err != nil {
 		return fmt.Errorf("GroupRepository.Delete: %w", err)
diff --git a/internal/service/monitor.go b/internal/service/monitor.go
index 00db778..b2b4058 100644
--- a/internal/service/monitor.go
+++ b/internal/service/monitor.go
@@ -2,6 +2,7 @@ package service
 
 import (
 	"context"
+	"errors"
 	"fmt"
 
 	"gitea.dwysokinski.me/twhelp/dcbot/internal/domain"
@@ -12,16 +13,35 @@ type MonitorRepository interface {
 	Create(ctx context.Context, params domain.CreateMonitorParams) (domain.Monitor, error)
 }
 
-type Monitor struct {
-	repo MonitorRepository
+//counterfeiter:generate -o internal/mock/group_getter.gen.go . GroupGetter
+type GroupGetter interface {
+	Get(ctx context.Context, id, serverID string) (domain.Group, error)
 }
 
-func (m *Monitor) Create(ctx context.Context, serverID string, params domain.CreateMonitorParams) (domain.Monitor, error) {
+type Monitor struct {
+	repo     MonitorRepository
+	groupSvc GroupGetter
+}
+
+func (m *Monitor) Create(ctx context.Context, groupID, serverID, tribeTag string) (domain.Monitor, error) {
 	// check if group exists
+	group, err := m.groupSvc.Get(ctx, groupID, serverID)
+	if err != nil {
+		if errors.Is(err, domain.GroupNotFoundError{ID: groupID}) {
+			return domain.Monitor{}, domain.GroupDoesNotExistError{ID: groupID}
+		}
+		return domain.Monitor{}, fmt.Errorf("GroupService.Get: %w", err)
+	}
+
+	// check limit
 
 	// check if tribe exists
 
-	// check limit
+	const temp = 123
+	params, err := domain.NewCreateMonitorParams(group.ID, temp)
+	if err != nil {
+		return domain.Monitor{}, fmt.Errorf("domain.NewCreateMonitorParams: %w", err)
+	}
 
 	monitor, err := m.repo.Create(ctx, params)
 	if err != nil {