diff --git a/coverage/coverage.out b/coverage/coverage.out
index 3b0cc50..c2fc402 100644
--- a/coverage/coverage.out
+++ b/coverage/coverage.out
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+github.com/muety/wakapi/services/misc.go:79.2,84.17 2 0
+github.com/muety/wakapi/services/misc.go:88.2,91.17 1 0
+github.com/muety/wakapi/services/misc.go:95.2,95.12 1 0
+github.com/muety/wakapi/services/misc.go:53.16,55.3 1 0
+github.com/muety/wakapi/services/misc.go:60.26,65.3 1 0
+github.com/muety/wakapi/services/misc.go:68.40,70.3 1 0
+github.com/muety/wakapi/services/misc.go:75.33,78.3 2 0
+github.com/muety/wakapi/services/misc.go:84.17,86.3 1 0
+github.com/muety/wakapi/services/misc.go:91.17,93.3 1 0
+github.com/muety/wakapi/services/misc.go:98.116,99.24 1 0
+github.com/muety/wakapi/services/misc.go:99.24,100.151 1 0
+github.com/muety/wakapi/services/misc.go:100.151,102.4 1 0
+github.com/muety/wakapi/services/misc.go:102.9,107.4 1 0
+github.com/muety/wakapi/services/report.go:24.122,35.33 3 0
+github.com/muety/wakapi/services/report.go:41.2,41.12 1 0
+github.com/muety/wakapi/services/report.go:35.33,36.31 1 0
+github.com/muety/wakapi/services/report.go:36.31,38.4 1 0
+github.com/muety/wakapi/services/report.go:44.38,48.16 3 0
+github.com/muety/wakapi/services/report.go:52.2,53.26 2 0
+github.com/muety/wakapi/services/report.go:48.16,50.3 1 0
+github.com/muety/wakapi/services/report.go:53.26,55.3 1 0
+github.com/muety/wakapi/services/report.go:60.61,65.65 3 0
+github.com/muety/wakapi/services/report.go:73.2,73.65 1 0
+github.com/muety/wakapi/services/report.go:85.2,85.24 1 0
+github.com/muety/wakapi/services/report.go:65.65,70.3 4 0
+github.com/muety/wakapi/services/report.go:73.65,83.3 4 0
+github.com/muety/wakapi/services/report.go:88.80,89.22 1 0
+github.com/muety/wakapi/services/report.go:93.2,93.29 1 0
+github.com/muety/wakapi/services/report.go:98.2,102.16 4 0
+github.com/muety/wakapi/services/report.go:107.2,114.65 2 0
+github.com/muety/wakapi/services/report.go:119.2,120.12 2 0
+github.com/muety/wakapi/services/report.go:89.22,91.3 1 0
+github.com/muety/wakapi/services/report.go:93.29,96.3 2 0
+github.com/muety/wakapi/services/report.go:102.16,105.3 2 0
+github.com/muety/wakapi/services/report.go:114.65,117.3 2 0
diff --git a/main.go b/main.go
index bb55c33..ec42035 100644
--- a/main.go
+++ b/main.go
@@ -168,6 +168,7 @@ func main() {
 	wakatimeV1SummariesHandler := wtV1Routes.NewSummariesHandler(userService, summaryService)
 	wakatimeV1StatsHandler := wtV1Routes.NewStatsHandler(userService, summaryService)
 	wakatimeV1UsersHandler := wtV1Routes.NewUsersHandler(userService, heartbeatService)
+	wakatimeV1ProjectsHandler := wtV1Routes.NewProjectsHandler(userService, heartbeatService)
 	shieldV1BadgeHandler := shieldsV1Routes.NewBadgeHandler(summaryService, userService)
 
 	// MVC Handlers
@@ -207,6 +208,7 @@ func main() {
 	wakatimeV1SummariesHandler.RegisterRoutes(apiRouter)
 	wakatimeV1StatsHandler.RegisterRoutes(apiRouter)
 	wakatimeV1UsersHandler.RegisterRoutes(apiRouter)
+	wakatimeV1ProjectsHandler.RegisterRoutes(apiRouter)
 	shieldV1BadgeHandler.RegisterRoutes(apiRouter)
 
 	// Static Routes
diff --git a/mocks/heartbeat_service.go b/mocks/heartbeat_service.go
index 72b2515..0eebe42 100644
--- a/mocks/heartbeat_service.go
+++ b/mocks/heartbeat_service.go
@@ -55,6 +55,11 @@ func (m *HeartbeatServiceMock) GetLatestByOriginAndUser(s string, user *models.U
 	return args.Get(0).(*models.Heartbeat), args.Error(1)
 }
 
+func (m *HeartbeatServiceMock) GetEntitySetByUser(u uint8, user *models.User) ([]string, error) {
+	args := m.Called(u, user)
+	return args.Get(0).([]string), args.Error(1)
+}
+
 func (m *HeartbeatServiceMock) DeleteBefore(time time.Time) error {
 	args := m.Called(time)
 	return args.Error(0)
diff --git a/models/compat/wakatime/v1/project.go b/models/compat/wakatime/v1/project.go
new file mode 100644
index 0000000..d00068e
--- /dev/null
+++ b/models/compat/wakatime/v1/project.go
@@ -0,0 +1,11 @@
+package v1
+
+type ProjectsViewModel struct {
+	Data []*Project `json:"data"`
+}
+
+type Project struct {
+	ID         string `json:"id"`
+	Name       string `json:"name"`
+	Repository string `json:"repository"`
+}
diff --git a/repositories/heartbeart.go b/repositories/heartbeart.go
index 0c86600..7de6eb9 100644
--- a/repositories/heartbeart.go
+++ b/repositories/heartbeart.go
@@ -1,6 +1,7 @@
 package repositories
 
 import (
+	"errors"
 	"github.com/muety/wakapi/models"
 	"gorm.io/gorm"
 	"gorm.io/gorm/clause"
@@ -136,6 +137,24 @@ func (r *HeartbeatRepository) CountByUsers(users []*models.User) ([]*models.Coun
 	return counts, nil
 }
 
+func (r HeartbeatRepository) GetEntitySetByUser(entityType uint8, user *models.User) ([]string, error) {
+	columns := []string{"project", "language", "editor", "operating_system", "machine"}
+	if int(entityType) >= len(columns) {
+		// invalid entity type
+		return nil, errors.New("invalid entity type")
+	}
+
+	var results []string
+	if err := r.db.
+		Model(&models.Heartbeat{}).
+		Distinct(columns[entityType]).
+		Where(&models.Heartbeat{UserID: user.ID}).
+		Find(&results).Error; err != nil {
+		return nil, err
+	}
+	return results, nil
+}
+
 func (r *HeartbeatRepository) DeleteBefore(t time.Time) error {
 	if err := r.db.
 		Where("time <= ?", t.Local()).
diff --git a/repositories/repositories.go b/repositories/repositories.go
index ae935a7..25b14db 100644
--- a/repositories/repositories.go
+++ b/repositories/repositories.go
@@ -27,6 +27,7 @@ type IHeartbeatRepository interface {
 	Count() (int64, error)
 	CountByUser(*models.User) (int64, error)
 	CountByUsers([]*models.User) ([]*models.CountByUser, error)
+	GetEntitySetByUser(uint8, *models.User) ([]string, error)
 	DeleteBefore(time.Time) error
 }
 
diff --git a/routes/api/heartbeat.go b/routes/api/heartbeat.go
index 70d4a60..db35940 100644
--- a/routes/api/heartbeat.go
+++ b/routes/api/heartbeat.go
@@ -39,7 +39,7 @@ func (h *HeartbeatApiHandler) RegisterRoutes(router *mux.Router) {
 		middlewares.NewAuthenticateMiddleware(h.userSrvc).Handler,
 		customMiddleware.NewWakatimeRelayMiddleware().Handler,
 	)
-	r.Path("").Methods(http.MethodPost).HandlerFunc(h.Post)
+	r.Methods(http.MethodPost).HandlerFunc(h.Post)
 }
 
 // @Summary Push a new heartbeat
diff --git a/routes/compat/wakatime/v1/projects.go b/routes/compat/wakatime/v1/projects.go
new file mode 100644
index 0000000..141ee24
--- /dev/null
+++ b/routes/compat/wakatime/v1/projects.go
@@ -0,0 +1,76 @@
+package v1
+
+import (
+	"github.com/gorilla/mux"
+	conf "github.com/muety/wakapi/config"
+	"github.com/muety/wakapi/middlewares"
+	"github.com/muety/wakapi/models"
+	v1 "github.com/muety/wakapi/models/compat/wakatime/v1"
+	"github.com/muety/wakapi/services"
+	"github.com/muety/wakapi/utils"
+	"net/http"
+	"strings"
+)
+
+type ProjectsHandler struct {
+	config        *conf.Config
+	userSrvc      services.IUserService
+	heartbeatSrvc services.IHeartbeatService
+}
+
+func NewProjectsHandler(userService services.IUserService, heartbeatsService services.IHeartbeatService) *ProjectsHandler {
+	return &ProjectsHandler{
+		userSrvc:      userService,
+		heartbeatSrvc: heartbeatsService,
+		config:        conf.Get(),
+	}
+}
+
+func (h *ProjectsHandler) RegisterRoutes(router *mux.Router) {
+	r := router.PathPrefix("/compat/wakatime/v1/users/{user}/projects").Subrouter()
+	r.Use(
+		middlewares.NewAuthenticateMiddleware(h.userSrvc).Handler,
+	)
+	r.Path("").Methods(http.MethodGet).HandlerFunc(h.Get)
+}
+
+// @Summary Retrieve and fitler the user's projects
+// @Description Mimics https://wakatime.com/developers#projects
+// @ID get-wakatime-projects
+// @Tags wakatime
+// @Produce json
+// @Param user path string true "User ID to fetch data for (or 'current')"
+// @Param q query string true "Query to filter projects by"
+// @Security ApiKeyAuth
+// @Success 200 {object} v1.ProjectsViewModel
+// @Router /compat/wakatime/v1/users/{user}/projects [get]
+func (h *ProjectsHandler) Get(w http.ResponseWriter, r *http.Request) {
+	var vars = mux.Vars(r)
+	requestedUser := vars["user"]
+	authorizedUser := middlewares.GetPrincipal(r)
+
+	if requestedUser != authorizedUser.ID && requestedUser != "current" {
+		w.WriteHeader(http.StatusForbidden)
+		return
+	}
+
+	results, err := h.heartbeatSrvc.GetEntitySetByUser(models.SummaryProject, authorizedUser)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte("something went wrong"))
+		conf.Log().Request(r).Error(err.Error())
+		return
+	}
+
+	q := r.URL.Query().Get("q")
+
+	projects := make([]*v1.Project, 0, len(results))
+	for _, p := range results {
+		if strings.HasPrefix(p, q) {
+			projects = append(projects, &v1.Project{ID: p, Name: p})
+		}
+	}
+
+	vm := &v1.ProjectsViewModel{Data: projects}
+	utils.RespondJSON(w, r, http.StatusOK, vm)
+}
diff --git a/services/heartbeat.go b/services/heartbeat.go
index 110572e..3cc4311 100644
--- a/services/heartbeat.go
+++ b/services/heartbeat.go
@@ -1,8 +1,11 @@
 package services
 
 import (
+	"fmt"
 	"github.com/muety/wakapi/config"
 	"github.com/muety/wakapi/repositories"
+	"github.com/muety/wakapi/utils"
+	"github.com/patrickmn/go-cache"
 	"time"
 
 	"github.com/muety/wakapi/models"
@@ -10,6 +13,7 @@ import (
 
 type HeartbeatService struct {
 	config              *config.Config
+	cache               *cache.Cache
 	repository          repositories.IHeartbeatRepository
 	languageMappingSrvc ILanguageMappingService
 }
@@ -17,12 +21,14 @@ type HeartbeatService struct {
 func NewHeartbeatService(heartbeatRepo repositories.IHeartbeatRepository, languageMappingService ILanguageMappingService) *HeartbeatService {
 	return &HeartbeatService{
 		config:              config.Get(),
+		cache:               cache.New(24*time.Hour, 24*time.Hour),
 		repository:          heartbeatRepo,
 		languageMappingSrvc: languageMappingService,
 	}
 }
 
 func (srv *HeartbeatService) Insert(heartbeat *models.Heartbeat) error {
+	srv.updateEntityUserCacheByHeartbeat(heartbeat)
 	return srv.repository.InsertBatch([]*models.Heartbeat{heartbeat})
 }
 
@@ -36,6 +42,7 @@ func (srv *HeartbeatService) InsertBatch(heartbeats []*models.Heartbeat) error {
 			filteredHeartbeats = append(filteredHeartbeats, hb)
 			hashes[hb.Hash] = true
 		}
+		srv.updateEntityUserCacheByHeartbeat(hb)
 	}
 
 	return srv.repository.InsertBatch(filteredHeartbeats)
@@ -73,6 +80,20 @@ func (srv *HeartbeatService) GetFirstByUsers() ([]*models.TimeByUser, error) {
 	return srv.repository.GetFirstByUsers()
 }
 
+func (srv *HeartbeatService) GetEntitySetByUser(entityType uint8, user *models.User) ([]string, error) {
+	cacheKey := srv.getEntityUserCacheKey(entityType, user)
+	if results, found := srv.cache.Get(cacheKey); found {
+		return utils.SetToStrings(results.(map[string]bool)), nil
+	}
+
+	results, err := srv.repository.GetEntitySetByUser(entityType, user)
+	if err != nil {
+		return nil, err
+	}
+	srv.cache.Set(cacheKey, utils.StringsToSet(results), cache.DefaultExpiration)
+	return results, nil
+}
+
 func (srv *HeartbeatService) DeleteBefore(t time.Time) error {
 	return srv.repository.DeleteBefore(t)
 }
@@ -89,3 +110,26 @@ func (srv *HeartbeatService) augmented(heartbeats []*models.Heartbeat, userId st
 
 	return heartbeats, nil
 }
+
+func (srv *HeartbeatService) getEntityUserCacheKey(entityType uint8, user *models.User) string {
+	return fmt.Sprintf("entity_set_%d_%s", entityType, user.ID)
+}
+
+func (srv *HeartbeatService) updateEntityUserCache(entityType uint8, entityKey string, user *models.User) {
+	cacheKey := srv.getEntityUserCacheKey(entityType, user)
+	if entities, found := srv.cache.Get(cacheKey); found {
+		if _, ok := entities.(map[string]bool)[entityKey]; !ok {
+			// new project / language / ..., which is not yet present in cache, arrived as part of a heartbeats
+			// -> invalidate cache
+			srv.cache.Delete(cacheKey)
+		}
+	}
+}
+
+func (srv *HeartbeatService) updateEntityUserCacheByHeartbeat(hb *models.Heartbeat) {
+	srv.updateEntityUserCache(models.SummaryProject, hb.Project, hb.User)
+	srv.updateEntityUserCache(models.SummaryLanguage, hb.Language, hb.User)
+	srv.updateEntityUserCache(models.SummaryEditor, hb.Editor, hb.User)
+	srv.updateEntityUserCache(models.SummaryOS, hb.OperatingSystem, hb.User)
+	srv.updateEntityUserCache(models.SummaryMachine, hb.Machine, hb.User)
+}
diff --git a/services/services.go b/services/services.go
index 6b3f9fe..7d5327b 100644
--- a/services/services.go
+++ b/services/services.go
@@ -35,6 +35,7 @@ type IHeartbeatService interface {
 	GetFirstByUsers() ([]*models.TimeByUser, error)
 	GetLatestByUser(*models.User) (*models.Heartbeat, error)
 	GetLatestByOriginAndUser(string, *models.User) (*models.Heartbeat, error)
+	GetEntitySetByUser(uint8, *models.User) ([]string, error)
 	DeleteBefore(time.Time) error
 }
 
diff --git a/static/docs/docs.go b/static/docs/docs.go
index 7414b63..e7e098d 100644
--- a/static/docs/docs.go
+++ b/static/docs/docs.go
@@ -160,6 +160,48 @@ var doc = `{
                 }
             }
         },
+        "/compat/wakatime/v1/users/{user}/projects": {
+            "get": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Mimics https://wakatime.com/developers#projects",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "wakatime"
+                ],
+                "summary": "Retrieve and fitler the user's projects",
+                "operationId": "get-wakatime-projects",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "User ID to fetch data for (or 'current')",
+                        "name": "user",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "Query to filter projects by",
+                        "name": "q",
+                        "in": "query",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/v1.ProjectsViewModel"
+                        }
+                    }
+                }
+            }
+        },
         "/compat/wakatime/v1/users/{user}/stats/{range}": {
             "get": {
                 "security": [
@@ -574,6 +616,31 @@ var doc = `{
                 }
             }
         },
+        "v1.Project": {
+            "type": "object",
+            "properties": {
+                "id": {
+                    "type": "string"
+                },
+                "name": {
+                    "type": "string"
+                },
+                "repository": {
+                    "type": "string"
+                }
+            }
+        },
+        "v1.ProjectsViewModel": {
+            "type": "object",
+            "properties": {
+                "data": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/v1.Project"
+                    }
+                }
+            }
+        },
         "v1.StatsData": {
             "type": "object",
             "properties": {
diff --git a/static/docs/swagger.json b/static/docs/swagger.json
index 9c49006..1fcf65a 100644
--- a/static/docs/swagger.json
+++ b/static/docs/swagger.json
@@ -144,6 +144,48 @@
                 }
             }
         },
+        "/compat/wakatime/v1/users/{user}/projects": {
+            "get": {
+                "security": [
+                    {
+                        "ApiKeyAuth": []
+                    }
+                ],
+                "description": "Mimics https://wakatime.com/developers#projects",
+                "produces": [
+                    "application/json"
+                ],
+                "tags": [
+                    "wakatime"
+                ],
+                "summary": "Retrieve and fitler the user's projects",
+                "operationId": "get-wakatime-projects",
+                "parameters": [
+                    {
+                        "type": "string",
+                        "description": "User ID to fetch data for (or 'current')",
+                        "name": "user",
+                        "in": "path",
+                        "required": true
+                    },
+                    {
+                        "type": "string",
+                        "description": "Query to filter projects by",
+                        "name": "q",
+                        "in": "query",
+                        "required": true
+                    }
+                ],
+                "responses": {
+                    "200": {
+                        "description": "OK",
+                        "schema": {
+                            "$ref": "#/definitions/v1.ProjectsViewModel"
+                        }
+                    }
+                }
+            }
+        },
         "/compat/wakatime/v1/users/{user}/stats/{range}": {
             "get": {
                 "security": [
@@ -558,6 +600,31 @@
                 }
             }
         },
+        "v1.Project": {
+            "type": "object",
+            "properties": {
+                "id": {
+                    "type": "string"
+                },
+                "name": {
+                    "type": "string"
+                },
+                "repository": {
+                    "type": "string"
+                }
+            }
+        },
+        "v1.ProjectsViewModel": {
+            "type": "object",
+            "properties": {
+                "data": {
+                    "type": "array",
+                    "items": {
+                        "$ref": "#/definitions/v1.Project"
+                    }
+                }
+            }
+        },
         "v1.StatsData": {
             "type": "object",
             "properties": {
diff --git a/static/docs/swagger.yaml b/static/docs/swagger.yaml
index 12b0eae..e1542cc 100644
--- a/static/docs/swagger.yaml
+++ b/static/docs/swagger.yaml
@@ -117,6 +117,22 @@ definitions:
       schemaVersion:
         type: integer
     type: object
+  v1.Project:
+    properties:
+      id:
+        type: string
+      name:
+        type: string
+      repository:
+        type: string
+    type: object
+  v1.ProjectsViewModel:
+    properties:
+      data:
+        items:
+          $ref: '#/definitions/v1.Project'
+        type: array
+    type: object
   v1.StatsData:
     properties:
       daily_average:
@@ -392,6 +408,33 @@ paths:
       summary: Retrieve summary for all time
       tags:
       - wakatime
+  /compat/wakatime/v1/users/{user}/projects:
+    get:
+      description: Mimics https://wakatime.com/developers#projects
+      operationId: get-wakatime-projects
+      parameters:
+      - description: User ID to fetch data for (or 'current')
+        in: path
+        name: user
+        required: true
+        type: string
+      - description: Query to filter projects by
+        in: query
+        name: q
+        required: true
+        type: string
+      produces:
+      - application/json
+      responses:
+        "200":
+          description: OK
+          schema:
+            $ref: '#/definitions/v1.ProjectsViewModel'
+      security:
+      - ApiKeyAuth: []
+      summary: Retrieve and fitler the user's projects
+      tags:
+      - wakatime
   /compat/wakatime/v1/users/{user}/stats/{range}:
     get:
       description: Mimics https://wakatime.com/developers#stats
diff --git a/utils/set.go b/utils/set.go
new file mode 100644
index 0000000..6f88023
--- /dev/null
+++ b/utils/set.go
@@ -0,0 +1,17 @@
+package utils
+
+func StringsToSet(slice []string) map[string]bool {
+	set := make(map[string]bool, len(slice))
+	for _, e := range slice {
+		set[e] = true
+	}
+	return set
+}
+
+func SetToStrings(set map[string]bool) []string {
+	slice := make([]string, len(set))
+	for k := range set {
+		slice = append(slice, k)
+	}
+	return slice
+}
diff --git a/version.txt b/version.txt
index 5db08bf..08002f8 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.27.0
+1.27.1