diff --git a/meter/fritz/smarthome/service.go b/meter/fritz/smarthome/service.go
new file mode 100644
index 000000000..367ae8885
--- /dev/null
+++ b/meter/fritz/smarthome/service.go
@@ -0,0 +1,83 @@
+package smarthome
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"slices"
+	"strings"
+
+	"github.com/evcc-io/evcc/meter/fritz"
+	"github.com/evcc-io/evcc/server/service"
+	"github.com/evcc-io/evcc/util"
+	"github.com/evcc-io/evcc/util/request"
+	"github.com/evcc-io/evcc/util/transport"
+	"github.com/samber/lo"
+)
+
+func init() {
+	mux := http.NewServeMux()
+	mux.HandleFunc("GET /devices", getDevices)
+
+	service.Register("fritz", mux)
+}
+
+func getDevices(w http.ResponseWriter, r *http.Request) {
+	q := r.URL.Query()
+	uri := strings.TrimRight(q.Get("uri"), "/")
+	user := q.Get("user")
+	password := q.Get("password")
+
+	if uri == "" || user == "" || password == "" {
+		jsonError(w, http.StatusBadRequest, errors.New("missing uri, user or password"))
+		return
+	}
+
+	log := util.NewLogger("fritz").Redact(password)
+	helper := request.NewHelper(log)
+	helper.Client.Transport = request.NewTripper(log, transport.Insecure())
+
+	settings := fritz.Settings{URI: uri, User: user, Password: password}
+
+	sid, err := settings.GetSessionID(helper)
+	if err != nil {
+		jsonError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	if sid == "0000000000000000" {
+		jsonError(w, http.StatusUnauthorized, errors.New("invalid user or password"))
+		return
+	}
+
+	req, _ := request.New(http.MethodGet,
+		fmt.Sprintf("%s/api/v0/smarthome/overview/devices", uri), nil, map[string]string{
+			"Authorization": "AVM-SID " + sid,
+		}, request.AcceptJSON,
+	)
+
+	var devices []Device
+	if err := helper.DoJSON(req, &devices); err != nil {
+		jsonError(w, http.StatusBadRequest, err)
+		return
+	}
+
+	ains := lo.Map(devices, func(d Device, _ int) string {
+		return d.AIN
+	})
+	slices.Sort(ains)
+
+	w.Header().Set("Cache-control", "max-age=60")
+	jsonWrite(w, ains)
+}
+
+func jsonWrite(w http.ResponseWriter, data any) {
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(data)
+}
+
+func jsonError(w http.ResponseWriter, status int, err error) {
+	w.WriteHeader(status)
+	jsonWrite(w, util.ErrorAsJson(err))
+}
diff --git a/meter/fritz/smarthome/types.go b/meter/fritz/smarthome/types.go
index 9b74a48cc..ecf901d45 100644
--- a/meter/fritz/smarthome/types.go
+++ b/meter/fritz/smarthome/types.go
@@ -1,5 +1,15 @@
 package smarthome
 
+// Device represents a smarthome device from the /devices endpoint
+type Device struct {
+	UID             string `json:"UID"`
+	AIN             string `json:"ain"`
+	Name            string `json:"name"`
+	ProductName     string `json:"productName"`
+	ProductCategory string `json:"productCategory"`
+	IsConnected     bool   `json:"isConnected"`
+}
+
 // Unit represents a smarthome unit with its interfaces
 type Unit struct {
 	GroupUID    string      `json:"groupUid,omitempty"`
diff --git a/server/http_site_handler.go b/server/http_site_handler.go
index 03c0a3f3d..8a89323ad 100644
--- a/server/http_site_handler.go
+++ b/server/http_site_handler.go
@@ -83,6 +83,7 @@ func jsonHandler(h http.Handler) http.Handler {
 }
 
 func jsonWrite(w http.ResponseWriter, data any) {
+	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(data)
 }
 
diff --git a/templates/definition/charger/fritzdect.yaml b/templates/definition/charger/fritzdect.yaml
index 922f4d127..3d66840ac 100644
--- a/templates/definition/charger/fritzdect.yaml
+++ b/templates/definition/charger/fritzdect.yaml
@@ -25,6 +25,7 @@ params:
     required: true
   - name: ain
     required: true
+    service: fritz/devices?uri={uri}&user={user}&password={password}
   - name: firmware82
     advanced: true
     type: bool
diff --git a/templates/definition/meter/fritzdect.yaml b/templates/definition/meter/fritzdect.yaml
index caab3a1b8..aae5f2470 100644
--- a/templates/definition/meter/fritzdect.yaml
+++ b/templates/definition/meter/fritzdect.yaml
@@ -27,6 +27,7 @@ params:
     required: true
   - name: ain
     required: true
+    service: fritz/devices?uri={uri}&user={user}&password={password}
   - name: firmware82
     advanced: true
     type: bool
diff --git a/templates/definition/meter/fritzgrid.yaml b/templates/definition/meter/fritzgrid.yaml
index f67125749..ab0c2f790 100644
--- a/templates/definition/meter/fritzgrid.yaml
+++ b/templates/definition/meter/fritzgrid.yaml
@@ -14,6 +14,7 @@ params:
     required: true
   - name: ain
     required: true
+    service: fritz/devices?uri={uri}&user={user}&password={password}
 render: |
   type: fritzdect
   uri: {{ .uri }}
diff --git a/util/homeassistant/service.go b/util/homeassistant/service.go
index 13f8853ff..72f0d4837 100644
--- a/util/homeassistant/service.go
+++ b/util/homeassistant/service.go
@@ -128,6 +128,7 @@ func getServices(w http.ResponseWriter, req *http.Request) {
 
 // jsonWrite writes a JSON response
 func jsonWrite(w http.ResponseWriter, data any) {
+	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(data)
 }