diff --git a/bin/evening_detective_server b/bin/evening_detective_server
index 0cf2b46..9ea0e33 100755
Binary files a/bin/evening_detective_server and b/bin/evening_detective_server differ
diff --git a/internal/app/team_registration.go b/internal/app/team_registration.go
index f3f11bb..e12dc9f 100644
--- a/internal/app/team_registration.go
+++ b/internal/app/team_registration.go
@@ -1,6 +1,7 @@
 package app
 
 import (
+	"bytes"
 	"context"
 	"crypto/subtle"
 	"encoding/json"
@@ -39,9 +40,8 @@ func TeamRegistrationHandler(token string, register func(context.Context, int, s
 			return
 		}
 		decoder := json.NewDecoder(http.MaxBytesReader(w, r.Body, 16<<10))
-		decoder.DisallowUnknownFields()
-		var registration game_service.Registration
-		if err := decoder.Decode(&registration); err != nil {
+		var payload json.RawMessage
+		if err := decoder.Decode(&payload); err != nil {
 			fail(http.StatusBadRequest, fmt.Sprintf("Некорректный JSON регистрации: %v", err))
 			return
 		}
@@ -54,6 +54,11 @@ func TeamRegistrationHandler(token string, register func(context.Context, int, s
 			}
 			return
 		}
+		registration, rpcID, isRPC, err := decodeRegistrationPayload(payload)
+		if err != nil {
+			fail(http.StatusBadRequest, fmt.Sprintf("Некорректный JSON регистрации: %v", err))
+			return
+		}
 		ctx, cancel := context.WithTimeout(r.Context(), 4*time.Second)
 		defer cancel()
 		id, err := register(ctx, int(gameID), deliveryID, registration)
@@ -65,7 +70,44 @@ func TeamRegistrationHandler(token string, register func(context.Context, int, s
 		case err != nil:
 			fail(http.StatusInternalServerError, "Не удалось зарегистрировать команду")
 		default:
-			_ = json.NewEncoder(w).Encode(map[string]int{"id": id})
+			if isRPC {
+				_ = json.NewEncoder(w).Encode(map[string]any{"jsonrpc": "2.0", "result": map[string]int{"id": id}, "id": rpcID})
+			} else {
+				_ = json.NewEncoder(w).Encode(map[string]int{"id": id})
+			}
 		}
 	})
 }
+
+func decodeRegistrationPayload(payload json.RawMessage) (game_service.Registration, json.RawMessage, bool, error) {
+	var fields map[string]json.RawMessage
+	if err := json.Unmarshal(payload, &fields); err != nil {
+		return game_service.Registration{}, nil, false, err
+	}
+	if rawRPC, ok := fields["jsonrpc"]; ok {
+		var version string
+		if err := json.Unmarshal(rawRPC, &version); err != nil || version != "2.0" {
+			return game_service.Registration{}, nil, true, errors.New(`поле "jsonrpc" должно быть равно "2.0"`)
+		}
+		params, ok := fields["params"]
+		if !ok {
+			return game_service.Registration{}, nil, true, errors.New(`в JSON-RPC запросе отсутствует поле "params"`)
+		}
+		var registration game_service.Registration
+		if err := decodeStrict(params, &registration); err != nil {
+			return game_service.Registration{}, nil, true, fmt.Errorf("поле params: %w", err)
+		}
+		return registration, fields["id"], true, nil
+	}
+	var registration game_service.Registration
+	if err := decodeStrict(payload, &registration); err != nil {
+		return game_service.Registration{}, nil, false, err
+	}
+	return registration, nil, false, nil
+}
+
+func decodeStrict(data []byte, target any) error {
+	decoder := json.NewDecoder(bytes.NewReader(data))
+	decoder.DisallowUnknownFields()
+	return decoder.Decode(target)
+}
diff --git a/internal/app/team_registration_test.go b/internal/app/team_registration_test.go
index 7d8ba4a..12981b4 100644
--- a/internal/app/team_registration_test.go
+++ b/internal/app/team_registration_test.go
@@ -29,6 +29,7 @@ func TestTeamRegistrationHandler(t *testing.T) {
 		{"malformed", "secret", "Bearer secret", "42", "delivery", `{`, nil, 400, false},
 		{"extra object", "secret", "Bearer secret", "42", "delivery", valid + ` {}`, nil, 400, false},
 		{"unknown field", "secret", "Bearer secret", "42", "delivery", `{"extra":1}`, nil, 400, false},
+		{"jsonrpc", "secret", "Bearer secret", "42", "delivery", `{"jsonrpc":"2.0","method":"register","params":{"name":"Команда","email":"captain@example.org","participantsCount":5},"id":1}`, nil, 200, true},
 		{"too large", "secret", "Bearer secret", "42", "delivery", `{"name":"` + strings.Repeat("a", 17000) + `"}`, nil, 400, false},
 		{"invalid fields", "secret", "Bearer secret", "42", "delivery", valid, game_service.ErrInvalidRegistration, 400, true},
 		{"closed", "secret", "Bearer secret", "42", "delivery", valid, teams_repo.ErrRegistrationClosed, 409, true},
@@ -55,7 +56,7 @@ func TestTeamRegistrationHandler(t *testing.T) {
 			if res.Code != tc.want || called != tc.called {
 				t.Fatalf("status=%d called=%v body=%s", res.Code, called, res.Body.String())
 			}
-			if tc.want == 200 && res.Body.String() != "{\"id\":7}\n" {
+			if tc.name == "success" && res.Body.String() != "{\"id\":7}\n" {
 				t.Fatal(res.Body.String())
 			}
 			if strings.Contains(res.Body.String(), "private database detail") {
@@ -70,6 +71,9 @@ func TestTeamRegistrationHandler(t *testing.T) {
 			if tc.name == "extra object" && !strings.Contains(res.Body.String(), "лишние данные") {
 				t.Fatalf("extra data reason missing: %s", res.Body.String())
 			}
+			if tc.name == "jsonrpc" && !strings.Contains(res.Body.String(), `"jsonrpc":"2.0"`) {
+				t.Fatalf("JSON-RPC response missing: %s", res.Body.String())
+			}
 		})
 	}
 }