diff --git a/sigi/apps/casas/filters.py b/sigi/apps/casas/filters.py
index cbf05ca..0a930ec 100644
--- a/sigi/apps/casas/filters.py
+++ b/sigi/apps/casas/filters.py
@@ -1,5 +1,8 @@
+from django_filters import CharFilter
+from django_filters.rest_framework import FilterSet
 from django.contrib import admin
 from django.utils.translation import gettext as _
+from sigi.apps.casas.models import Orgao
 from sigi.apps.servidores.models import Servidor
 from sigi.apps.convenios.models import Projeto
 from sigi.apps.servicos.models import TipoServico, Servico
@@ -56,3 +59,25 @@ class ServicoFilter(admin.SimpleListFilter):
                 )
 
         return queryset.distinct("municipio__uf__nome", "nome")
+
+
+class OrgaoAtendidoFilterset(FilterSet):
+    convenio_sigla = CharFilter(
+        field_name="convenio__projeto__sigla", lookup_expr="iexact"
+    )
+    evento_categoria_sigla = CharFilter(
+        field_name="evento__tipo_evento__categoria", lookup_expr="iexact"
+    )
+    servico_sigla = CharFilter(
+        field_name="servico__tipo_servico__sigla", lookup_expr="iexact"
+    )
+    tipo_sigla = CharFilter(field_name="tipo__sigla", lookup_expr="iexact")
+
+    class Meta:
+        model = Orgao
+        fields = [
+            "convenio_sigla",
+            "evento_categoria_sigla",
+            "servico_sigla",
+            "tipo_sigla",
+        ]
diff --git a/sigi/apps/casas/serializers.py b/sigi/apps/casas/serializers.py
index 530361b..5e71cd2 100644
--- a/sigi/apps/casas/serializers.py
+++ b/sigi/apps/casas/serializers.py
@@ -12,20 +12,18 @@ class AnexoConvenioSerializer(serializers.ModelSerializer):
 
 
 class ConvenioSerializer(serializers.ModelSerializer):
-    projeto = serializers.SlugRelatedField(read_only=True, slug_field="nome")
+    sigla = serializers.ReadOnlyField(source="projeto.sigla")
+    projeto = serializers.ReadOnlyField(source="projeto.nome")
     status = serializers.SerializerMethodField("get_status")
     inicio_vigencia = serializers.SerializerMethodField("get_inicio_vigencia")
-    termino_vigencia = serializers.SerializerMethodField(
-        "get_termino_vigencia"
-    )
-    documento_gescon = serializers.SerializerMethodField(
-        "get_documento_gescon"
-    )
+    termino_vigencia = serializers.SerializerMethodField("get_termino_vigencia")
+    documento_gescon = serializers.SerializerMethodField("get_documento_gescon")
     anexo_set = AnexoConvenioSerializer(many=True, read_only=True)
 
     class Meta:
         model = Convenio
         fields = [
+            "sigla",
             "projeto",
             "num_convenio",
             "status",
@@ -49,25 +47,33 @@ class ConvenioSerializer(serializers.ModelSerializer):
 
 
 class EventoSerializer(serializers.ModelSerializer):
+    categoria_sigla = serializers.SerializerMethodField("get_categoria_sigla")
+    categoria_nome = serializers.SerializerMethodField("get_categoria_nome")
+
     class Meta:
         model = Evento
         fields = [
             "nome",
+            "categoria_nome",
+            "categoria_sigla",
             "data_inicio",
             "data_termino",
             "num_processo",
             "total_participantes",
         ]
 
+    def get_categoria_sigla(self, obj):
+        return obj.tipo_evento.categoria
+
+    def get_categoria_nome(self, obj):
+        return obj.tipo_evento.get_categoria_display()
+
 
 class ServicoSerializer(serializers.ModelSerializer):
-    tipo_servico = serializers.SlugRelatedField(
-        read_only=True, slug_field="nome"
-    )
+    sigla = serializers.ReadOnlyField(source="tipo_servico.sigla")
+    tipo_servico = serializers.ReadOnlyField(source="tipo_servico.nome")
     url = serializers.SerializerMethodField("get_url")
-    data_verificacao = serializers.SerializerMethodField(
-        "get_data_verificacao"
-    )
+    data_verificacao = serializers.SerializerMethodField("get_data_verificacao")
     resultado_verificacao = serializers.SerializerMethodField(
         "get_resultado_verificacao"
     )
@@ -75,6 +81,7 @@ class ServicoSerializer(serializers.ModelSerializer):
     class Meta:
         model = Servico
         fields = [
+            "sigla",
             "tipo_servico",
             "data_ativacao",
             "url",
@@ -102,6 +109,7 @@ class ServicoSerializer(serializers.ModelSerializer):
 
 class OrgaoAtendidoSerializer(serializers.ModelSerializer):
     tipo = serializers.StringRelatedField()
+    tipo_sigla = serializers.ReadOnlyField(source="tipo.sigla")
     municipio = serializers.SlugRelatedField(read_only=True, slug_field="nome")
     uf_nome = serializers.SerializerMethodField("get_uf_nome")
     uf_sigla = serializers.SerializerMethodField("get_uf_sigla")
@@ -116,6 +124,7 @@ class OrgaoAtendidoSerializer(serializers.ModelSerializer):
             "nome",
             "sigla",
             "tipo",
+            "tipo_sigla",
             "cnpj",
             "logradouro",
             "bairro",
diff --git a/sigi/apps/casas/views.py b/sigi/apps/casas/views.py
index c53b8ea..0b94df0 100644
--- a/sigi/apps/casas/views.py
+++ b/sigi/apps/casas/views.py
@@ -19,8 +19,10 @@ from django.views.generic import (
     ListView,
     UpdateView,
 )
+from django_filters.rest_framework import DjangoFilterBackend
 from django_weasyprint.views import WeasyTemplateResponse
 from rest_framework import generics, filters
+from sigi.apps.casas.filters import OrgaoAtendidoFilterset
 from sigi.apps.casas.forms import FuncionarioForm, CnpjErradoForm
 from sigi.apps.casas.models import Funcionario, Orgao, TipoOrgao
 from sigi.apps.casas.serializers import OrgaoAtendidoSerializer
@@ -389,9 +391,7 @@ class CnpjDuplicadoReport(
         )
 
 
-class CnpjErradoReport(
-    LoginRequiredMixin, UserPassesTestMixin, ReportListView
-):
+class CnpjErradoReport(LoginRequiredMixin, UserPassesTestMixin, ReportListView):
     title = _("Órgãos com CNPJ digitado errado")
     empty_message = _("Nenhum órgão com CNPJ digitado errado")
     queryset = (
@@ -650,7 +650,8 @@ class ApiOrgaoAtendidoList(generics.ListAPIView):
     """
 
     serializer_class = OrgaoAtendidoSerializer
-    filter_backends = [filters.SearchFilter]
+    filter_backends = [filters.SearchFilter, DjangoFilterBackend]
+    filterset_class = OrgaoAtendidoFilterset
     search_fields = ["search_text"]
 
     def get_queryset(self):