diff --git a/cmd/server/main.go b/cmd/server/main.go
index 4209beb..045912f 100644
--- a/cmd/server/main.go
+++ b/cmd/server/main.go
@@ -75,7 +75,7 @@ func main() {
 
 	// --- Инициализация хендлеров ---
 	userHandler := &api.UserHandler{Service: userService}
-	authHandler := &api.AuthHandler{Service: authService}
+	authHandler := &api.AuthHandler{Service: authService, ProfileService: profileService, Domain: domain}
 	profileHandler := &api.ProfileHandler{Service: profileService}
 	serverHandler := &api.ServerHandler{Repo: serverRepo}
 	launcherHandler := &api.LauncherHandler{ModpackRepo: modpackRepo}
@@ -129,6 +129,31 @@ func main() {
 		r.Get("/profile/{uuid}", profileHandler.GetProfile)
 	})
 
+	// --- Yggdrasil API (for authlib-injector) ---
+	r.Route("/api/yggdrasil", func(r chi.Router) {
+		r.Get("/", authHandler.GetMetadata)
+
+		r.Route("/authserver", func(r chi.Router) {
+			r.Post("/authenticate", authHandler.Authenticate)
+			r.Post("/invalidate", func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusNoContent) })
+			r.Post("/validate", func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusNoContent) })
+			r.Post("/signout", func(w http.ResponseWriter, r *http.Request) { w.WriteHeader(http.StatusNoContent) })
+			r.Post("/refresh", func(w http.ResponseWriter, r *http.Request) {
+				// Fallback for refresh - return 400 or implement real refresh
+				http.Error(w, "Not implemented", http.StatusForbidden)
+			})
+		})
+
+		r.Route("/sessionserver/session/minecraft", func(r chi.Router) {
+			r.Post("/join", authHandler.Join)
+			r.Get("/hasJoined", func(w http.ResponseWriter, r *http.Request) {
+				// Legacy hasJoined endpoint if needed, but modern mostly uses join/check
+				w.WriteHeader(http.StatusNoContent)
+			})
+			r.Get("/profile/{uuid}", profileHandler.GetProfile)
+		})
+	})
+
 	// --- Защищенные роуты ---
 	r.Group(func(r chi.Router) {
 		r.Use(api.AuthMiddleware)
diff --git a/internal/api/auth_handler.go b/internal/api/auth_handler.go
index ad562be..4b0578d 100644
--- a/internal/api/auth_handler.go
+++ b/internal/api/auth_handler.go
@@ -12,7 +12,9 @@ import (
 )
 
 type AuthHandler struct {
-	Service *core.AuthService
+	Service        *core.AuthService
+	ProfileService *core.ProfileService
+	Domain         string
 }
 
 // YggdrasilError - стандартный формат ошибки для authserver
@@ -126,3 +128,27 @@ func (h *AuthHandler) Login(w http.ResponseWriter, r *http.Request) {
 	w.WriteHeader(http.StatusOK)
 	json.NewEncoder(w).Encode(response)
 }
+
+func (h *AuthHandler) GetMetadata(w http.ResponseWriter, r *http.Request) {
+	pubKey, err := h.ProfileService.GetPublicKey()
+	if err != nil {
+		slog.Error("Failed to get public key", "error", err)
+		http.Error(w, "Internal server error", http.StatusInternalServerError)
+		return
+	}
+
+	metadata := models.YggdrasilMetadata{
+		Meta: models.MetaLinks{
+			Homepage: "https://" + h.Domain,
+			Register: "https://" + h.Domain + "/register",
+		},
+		SkinDomains: models.MetaSkinDomains{
+			Deny: []string{},
+		},
+		Signature: pubKey,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(metadata)
+}
diff --git a/internal/core/profile_service.go b/internal/core/profile_service.go
index 94544a2..01c9879 100644
--- a/internal/core/profile_service.go
+++ b/internal/core/profile_service.go
@@ -158,3 +158,19 @@ func (s *ProfileService) UpdateUserSkin(ctx context.Context, userID int, file mu
 
 	return s.UserRepo.UpdateSkinHash(ctx, userID, hash)
 }
+
+// GetPublicKey возвращает публичный ключ в формате PEM
+func (s *ProfileService) GetPublicKey() (string, error) {
+	pubKey := &s.privateKey.PublicKey
+	pubASN1, err := x509.MarshalPKIXPublicKey(pubKey)
+	if err != nil {
+		return "", err
+	}
+
+	pubBytes := pem.EncodeToMemory(&pem.Block{
+		Type:  "PUBLIC KEY",
+		Bytes: pubASN1,
+	})
+
+	return string(pubBytes), nil
+}
diff --git a/internal/models/auth.go b/internal/models/auth.go
index 6af3901..7abcf30 100644
--- a/internal/models/auth.go
+++ b/internal/models/auth.go
@@ -86,3 +86,22 @@ type LoginResponse struct {
 	Token string `json:"token"`
 	User  *User  `json:"user"`
 }
+
+// MetaLinks - ссылки в метаданных
+type MetaLinks struct {
+	Homepage string `json:"homepage,omitempty"`
+	Register string `json:"register,omitempty"`
+}
+
+// MetaSkinDomains - домены скинов
+type MetaSkinDomains struct {
+	Deny []string `json:"deny,omitempty"`
+}
+
+// YggdrasilMetadata - структура для ответа на запрос метаданных (/)
+// См. https://github.com/yushijinhun/authlib-injector/wiki/Yggdrasil-API-Implementation-Spec
+type YggdrasilMetadata struct {
+	Meta        MetaLinks       `json:"meta,omitempty"`
+	SkinDomains MetaSkinDomains `json:"skinDomains"`
+	Signature   string          `json:"signature"` // Public key in PEM format
+}