diff --git a/participation/api/serializers.py b/participation/api/serializers.py
index 683826f..5aa2b27 100644
--- a/participation/api/serializers.py
+++ b/participation/api/serializers.py
@@ -61,3 +61,9 @@ class TournamentSerializer(serializers.ModelSerializer):
                   'inscription_limit', 'solution_limit', 'solutions_draw', 'syntheses_first_phase_limit',
                   'solutions_available_second_phase', 'syntheses_second_phase_limit',
                   'description', 'organizers', 'final', 'participations',)
+
+
+class TweakSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Team
+        fields = '__all__'
diff --git a/participation/api/urls.py b/participation/api/urls.py
index fd27494..7034d0c 100644
--- a/participation/api/urls.py
+++ b/participation/api/urls.py
@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 from .views import NoteViewSet, ParticipationViewSet, PassageViewSet, PoolViewSet, \
-    SolutionViewSet, SynthesisViewSet, TeamViewSet, TournamentViewSet
+    SolutionViewSet, SynthesisViewSet, TeamViewSet, TournamentViewSet, TweakViewSet
 
 
 def register_participation_urls(router, path):
@@ -17,3 +17,4 @@ def register_participation_urls(router, path):
     router.register(path + "/synthesis", SynthesisViewSet)
     router.register(path + "/team", TeamViewSet)
     router.register(path + "/tournament", TournamentViewSet)
+    router.register(path + "/tweak", TweakViewSet)
diff --git a/participation/api/views.py b/participation/api/views.py
index a1a159b..aa6793a 100644
--- a/participation/api/views.py
+++ b/participation/api/views.py
@@ -4,8 +4,8 @@ from django_filters.rest_framework import DjangoFilterBackend
 from rest_framework.viewsets import ModelViewSet
 
 from .serializers import NoteSerializer, ParticipationSerializer, PassageSerializer, PoolSerializer, \
-    SolutionSerializer, SynthesisSerializer, TeamSerializer, TournamentSerializer
-from ..models import Note, Participation, Passage, Pool, Solution, Synthesis, Team, Tournament
+    SolutionSerializer, SynthesisSerializer, TeamSerializer, TournamentSerializer, TweakSerializer
+from ..models import Note, Participation, Passage, Pool, Solution, Synthesis, Team, Tournament, Tweak
 
 
 class NoteViewSet(ModelViewSet):
@@ -67,3 +67,11 @@ class TournamentViewSet(ModelViewSet):
                         'inscription_limit', 'solution_limit', 'solutions_draw', 'syntheses_first_phase_limit',
                         'solutions_available_second_phase', 'syntheses_second_phase_limit',
                         'description', 'organizers', 'final', ]
+
+
+class TweakViewSet(ModelViewSet):
+    queryset = Tweak.objects.all()
+    serializer_class = TweakSerializer
+    filter_backends = [DjangoFilterBackend]
+    filterset_fields = ['pool', 'pool__tournament', 'pool__tournament__name', 'participation',
+                        'participation__team__trigram', 'diff', ]
diff --git a/registration/api/serializers.py b/registration/api/serializers.py
index 0c00600..14330b1 100644
--- a/registration/api/serializers.py
+++ b/registration/api/serializers.py
@@ -5,7 +5,7 @@ from rest_framework import serializers
 from rest_polymorphic.serializers import PolymorphicSerializer
 
 from ..models import CoachRegistration, ParticipantRegistration, \
-    StudentRegistration, VolunteerRegistration
+    Payment, StudentRegistration, VolunteerRegistration
 
 
 class CoachSerializer(serializers.ModelSerializer):
@@ -38,3 +38,9 @@ class RegistrationSerializer(PolymorphicSerializer):
         StudentRegistration: StudentSerializer,
         VolunteerRegistration: VolunteerSerializer,
     }
+
+
+class PaymentSerializer(serializers.ModelSerializer):
+    class Meta:
+        model = Payment
+        fields = '__all__'
diff --git a/registration/api/urls.py b/registration/api/urls.py
index 620d6ac..b7bce3d 100644
--- a/registration/api/urls.py
+++ b/registration/api/urls.py
@@ -1,11 +1,12 @@
 # Copyright (C) 2020 by Animath
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-from .views import RegistrationViewSet
+from .views import PaymentViewSet, RegistrationViewSet
 
 
 def register_registration_urls(router, path):
     """
     Configure router for registration REST API.
     """
+    router.register(path + "/payment", PaymentViewSet)
     router.register(path + "/registration", RegistrationViewSet)
diff --git a/registration/api/views.py b/registration/api/views.py
index 7e48cfe..dc787e9 100644
--- a/registration/api/views.py
+++ b/registration/api/views.py
@@ -4,8 +4,8 @@
 from django_filters.rest_framework import DjangoFilterBackend
 from rest_framework.viewsets import ModelViewSet
 
-from .serializers import RegistrationSerializer
-from ..models import Registration
+from .serializers import PaymentSerializer, RegistrationSerializer
+from ..models import Payment, Registration
 
 
 class RegistrationViewSet(ModelViewSet):
@@ -13,3 +13,10 @@ class RegistrationViewSet(ModelViewSet):
     serializer_class = RegistrationSerializer
     filter_backends = [DjangoFilterBackend]
     filterset_fields = ['user', 'participantregistration__team', ]
+
+
+class PaymentViewSet(ModelViewSet):
+    queryset = Payment.objects.all()
+    serializer_class = PaymentSerializer
+    filter_backends = [DjangoFilterBackend]
+    filterset_fields = ['registrations', 'grouped', 'amount', 'final', 'type', 'valid', ]