diff --git a/app/Api/V2/Controllers/Chart/AccountController.php b/app/Api/V2/Controllers/Chart/AccountController.php
index fabb42e6a0..868a446ecd 100644
--- a/app/Api/V2/Controllers/Chart/AccountController.php
+++ b/app/Api/V2/Controllers/Chart/AccountController.php
@@ -31,7 +31,7 @@ use FireflyIII\Models\Account;
 use FireflyIII\Models\AccountType;
 use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\Repositories\Administration\Account\AccountRepositoryInterface;
-use FireflyIII\Support\Http\Api\ConvertsExchangeRates;
+use FireflyIII\Support\Http\Api\CleansChartData;
 use FireflyIII\User;
 use Illuminate\Http\JsonResponse;
 use Psr\Container\ContainerExceptionInterface;
@@ -42,7 +42,7 @@ use Psr\Container\NotFoundExceptionInterface;
  */
 class AccountController extends Controller
 {
-    use ConvertsExchangeRates;
+    use CleansChartData;
 
     private AccountRepositoryInterface $repository;
 
@@ -81,6 +81,7 @@ class AccountController extends Controller
         $start = $dates['start'];
         /** @var Carbon $end */
         $end = $dates['end'];
+        $end->endOfDay();
         /** @var User $user */
         $user = auth()->user();
 
@@ -120,8 +121,9 @@ class AccountController extends Controller
                 'native_code'             => $default->code,
                 'native_symbol'           => $default->symbol,
                 'native_decimal_places'   => (int)$default->decimal_places,
-                'start_date'              => $start->toAtomString(),
-                'end_date'                => $end->toAtomString(),
+                'start'                   => $start->toAtomString(),
+                'end'                     => $end->toAtomString(),
+                'period'                  => '1D',
                 'entries'                 => [],
                 'native_entries'          => [],
             ];
@@ -146,6 +148,6 @@ class AccountController extends Controller
             $chartData[] = $currentSet;
         }
 
-        return response()->json($chartData);
+        return response()->json($this->clean($chartData));
     }
 }
diff --git a/app/Api/V2/Controllers/Chart/BalanceController.php b/app/Api/V2/Controllers/Chart/BalanceController.php
index d9101a147b..0a6a4cd4c0 100644
--- a/app/Api/V2/Controllers/Chart/BalanceController.php
+++ b/app/Api/V2/Controllers/Chart/BalanceController.php
@@ -28,7 +28,7 @@ use FireflyIII\Helpers\Collector\GroupCollectorInterface;
 use FireflyIII\Models\TransactionCurrency;
 use FireflyIII\Models\TransactionType;
 use FireflyIII\Repositories\Administration\Account\AccountRepositoryInterface;
-use FireflyIII\Support\Http\Api\ConvertsExchangeRates;
+use FireflyIII\Support\Http\Api\CleansChartData;
 use FireflyIII\Support\Http\Api\ExchangeRateConverter;
 use Illuminate\Http\JsonResponse;
 use Illuminate\Support\Collection;
@@ -38,7 +38,7 @@ use Illuminate\Support\Collection;
  */
 class BalanceController extends Controller
 {
-    use ConvertsExchangeRates;
+    use CleansChartData;
 
     private AccountRepositoryInterface $repository;
 
@@ -76,6 +76,7 @@ class BalanceController extends Controller
         $start = $params['start'];
         /** @var Carbon $end */
         $end = $params['end'];
+        $end->endOfDay();
         /** @var Collection $accounts */
         $accounts       = $params['accounts'];
         $preferredRange = $params['period'];
@@ -196,6 +197,9 @@ class BalanceController extends Controller
                 'native_symbol'           => $currency['native_symbol'],
                 'native_code'             => $currency['native_code'],
                 'native_decimal_places'   => $currency['native_decimal_places'],
+                'start'                   => $start->toAtomString(),
+                'end'                     => $end->toAtomString(),
+                'period'                  => $preferredRange,
                 'entries'                 => [],
                 'native_entries'          => [],
             ];
@@ -209,6 +213,9 @@ class BalanceController extends Controller
                 'native_symbol'           => $currency['native_symbol'],
                 'native_code'             => $currency['native_code'],
                 'native_decimal_places'   => $currency['native_decimal_places'],
+                'start'                   => $start->toAtomString(),
+                'end'                     => $end->toAtomString(),
+                'period'                  => $preferredRange,
                 'entries'                 => [],
                 'native_entries'          => [],
 
@@ -233,7 +240,7 @@ class BalanceController extends Controller
             $chartData[] = $income;
             $chartData[] = $expense;
         }
-        return response()->json($chartData);
+        return response()->json($this->clean($chartData));
     }
 
 }
diff --git a/app/Support/Http/Api/CleansChartData.php b/app/Support/Http/Api/CleansChartData.php
new file mode 100644
index 0000000000..3d969a5ad9
--- /dev/null
+++ b/app/Support/Http/Api/CleansChartData.php
@@ -0,0 +1,69 @@
+<?php
+/*
+ * CleansChartData.php
+ * Copyright (c) 2023 james@firefly-iii.org
+ *
+ * This file is part of Firefly III (https://github.com/firefly-iii).
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+namespace FireflyIII\Support\Http\Api;
+
+use FireflyIII\Exceptions\FireflyException;
+
+/**
+ * Trait CleansChartData
+ */
+trait CleansChartData
+{
+    /**
+     * Clean up given chart data array. Each entry is supposed to be a
+     * "main" entry used in the V2 API chart endpoints. This loop makes sure
+     * IDs are strings and other values are present (or missing).
+     *
+     * @param array $data
+     *
+     * @return array
+     * @throws FireflyException
+     */
+    private function clean(array $data): array
+    {
+        $return = [];
+        /**
+         * @var mixed $index
+         * @var array $array
+         */
+        foreach ($data as $index => $array) {
+            if (array_key_exists('currency_id', $array)) {
+                $array['currency_id'] = (string)$array['currency_id'];
+            }
+            if (array_key_exists('native_id', $array)) {
+                $array['native_id'] = (string)$array['native_id'];
+            }
+            if (!array_key_exists('end', $array)) {
+                throw new FireflyException(sprintf('Data-set "%s" is missing the "end"-variable.', $index));
+            }
+            if (!array_key_exists('start', $array)) {
+                throw new FireflyException(sprintf('Data-set "%s" is missing the "start"-variable.', $index));
+            }
+            if (!array_key_exists('period', $array)) {
+                throw new FireflyException(sprintf('Data-set "%s" is missing the "period"-variable.', $index));
+            }
+            $return[] = $array;
+        }
+        return $return;
+    }
+
+}
diff --git a/app/Support/Http/Api/ConvertsExchangeRates.php b/app/Support/Http/Api/ConvertsExchangeRates.php
index c2d828903d..7c80220e46 100644
--- a/app/Support/Http/Api/ConvertsExchangeRates.php
+++ b/app/Support/Http/Api/ConvertsExchangeRates.php
@@ -230,9 +230,11 @@ trait ConvertsExchangeRates
      * @param array $entries
      *
      * @return array
+     * @deprecated
      */
     public function cerSum(array $entries): array
     {
+        die('do not use me, needs refactor');
         if (null === $this->enabled) {
             $this->getPreference();
         }
diff --git a/config/firefly.php b/config/firefly.php
index 240ba477b8..b800bbc188 100644
--- a/config/firefly.php
+++ b/config/firefly.php
@@ -108,8 +108,8 @@ return [
         'handle_debts' => true,
         // see cer.php for exchange rates feature flag.
     ],
-    'version'                      => '6.0.19',
-    'api_version'                  => '2.0.4',
+    'version'                      => '6.0.20',
+    'api_version'                  => '2.0.5',
     'db_version'                   => 19,
 
     // generic settings