diff --git a/src/sentry/api/endpoints/organization_details.py b/src/sentry/api/endpoints/organization_details.py
index ac9cd0fa5dde6a..258f3202a386f3 100644
--- a/src/sentry/api/endpoints/organization_details.py
+++ b/src/sentry/api/endpoints/organization_details.py
@@ -62,6 +62,7 @@
     SAFE_FIELDS_DEFAULT,
     SCRAPE_JAVASCRIPT_DEFAULT,
     SENSITIVE_FIELDS_DEFAULT,
+    TARGET_SAMPLE_RATE_DEFAULT,
     UPTIME_AUTODETECTION,
 )
 from sentry.datascrubbing import validate_pii_config_update, validate_pii_selectors
@@ -215,6 +216,7 @@
         METRICS_ACTIVATE_LAST_FOR_GAUGES_DEFAULT,
     ),
     ("uptimeAutodetection", "sentry:uptime_autodetection", bool, UPTIME_AUTODETECTION),
+    ("targetSampleRate", "sentry:target_sample_rate", float, TARGET_SAMPLE_RATE_DEFAULT),
 )
 
 DELETION_STATUSES = frozenset(
@@ -276,6 +278,7 @@ class OrganizationSerializer(BaseOrganizationSerializer):
     relayPiiConfig = serializers.CharField(required=False, allow_blank=True, allow_null=True)
     apdexThreshold = serializers.IntegerField(min_value=1, required=False)
     uptimeAutodetection = serializers.BooleanField(required=False)
+    targetSampleRate = serializers.FloatField(required=False)
 
     @cached_property
     def _has_legacy_rate_limits(self):
@@ -365,6 +368,25 @@ def validate_projectRateLimit(self, value):
             )
         return value
 
+    def validate_targetSampleRate(self, value):
+        from sentry import features
+
+        organization = self.context["organization"]
+        request = self.context["request"]
+        has_dynamic_sampling_custom = features.has(
+            "organizations:dynamic-sampling-custom", organization, actor=request.user
+        )
+        if not has_dynamic_sampling_custom:
+            raise serializers.ValidationError(
+                "Organization does not have the custom dynamic sample rate feature enabled."
+            )
+
+        if not 0.0 <= value <= 1.0:
+            raise serializers.ValidationError(
+                "The targetSampleRate option must be in the range [0:1]"
+            )
+        return value
+
     def validate(self, attrs):
         attrs = super().validate(attrs)
         if attrs.get("avatarType") == "upload":
diff --git a/src/sentry/constants.py b/src/sentry/constants.py
index 3ce14a64301cb4..41bee5a4a92240 100644
--- a/src/sentry/constants.py
+++ b/src/sentry/constants.py
@@ -710,6 +710,7 @@ class InsightModules(Enum):
 METRICS_ACTIVATE_LAST_FOR_GAUGES_DEFAULT = False
 DATA_CONSENT_DEFAULT = False
 UPTIME_AUTODETECTION = True
+TARGET_SAMPLE_RATE_DEFAULT = 1.0
 
 # `sentry:events_member_admin` - controls whether the 'member' role gets the event:admin scope
 EVENTS_MEMBER_ADMIN_DEFAULT = True
diff --git a/tests/sentry/api/endpoints/test_organization_details.py b/tests/sentry/api/endpoints/test_organization_details.py
index 03beb0566d2639..309f82a8be5aad 100644
--- a/tests/sentry/api/endpoints/test_organization_details.py
+++ b/tests/sentry/api/endpoints/test_organization_details.py
@@ -410,7 +410,7 @@ def test_upload_avatar(self):
         "sentry.integrations.github.integration.GitHubApiClient.get_repositories",
         return_value=[{"name": "cool-repo", "full_name": "testgit/cool-repo"}],
     )
-    @with_feature("organizations:codecov-integration")
+    @with_feature(["organizations:codecov-integration", "organizations:dynamic-sampling-custom"])
     def test_various_options(self, mock_get_repositories):
         initial = self.organization.get_audit_log_data()
         with assume_test_silo_mode_of(AuditLogEntry):
@@ -455,6 +455,7 @@ def test_various_options(self, mock_get_repositories):
             "metricsActivatePercentiles": False,
             "metricsActivateLastForGauges": True,
             "uptimeAutodetection": False,
+            "targetSampleRate": 0.1,
         }
 
         # needed to set require2FA
@@ -493,6 +494,7 @@ def test_various_options(self, mock_get_repositories):
         assert options.get("sentry:metrics_activate_percentiles") is False
         assert options.get("sentry:metrics_activate_last_for_gauges") is True
         assert options.get("sentry:uptime_autodetection") is False
+        assert options.get("sentry:target_sample_rate") == 0.1
 
         # log created
         with assume_test_silo_mode_of(AuditLogEntry):
@@ -940,6 +942,35 @@ def test_org_mapping_already_taken(self):
         self.create_organization(slug="taken")
         self.get_error_response(self.organization.slug, slug="taken", status_code=400)
 
+    def test_target_sample_rate_feature(self):
+        with self.feature("organizations:dynamic-sampling-custom"):
+            data = {"targetSampleRate": 0.1}
+            self.get_success_response(self.organization.slug, **data)
+
+        with self.feature({"organizations:dynamic-sampling-custom": False}):
+            data = {"targetSampleRate": 0.1}
+            self.get_error_response(self.organization.slug, status_code=400, **data)
+
+    @with_feature("organizations:dynamic-sampling-custom")
+    def test_target_sample_rate_range(self):
+        # low, within and high
+        data = {"targetSampleRate": 0.0}
+        self.get_success_response(self.organization.slug, **data)
+
+        data = {"targetSampleRate": 0.1}
+        self.get_success_response(self.organization.slug, **data)
+
+        data = {"targetSampleRate": 1.0}
+        self.get_success_response(self.organization.slug, **data)
+
+        # below range
+        data = {"targetSampleRate": -0.1}
+        self.get_error_response(self.organization.slug, status_code=400, **data)
+
+        # above range
+        data = {"targetSampleRate": 1.1}
+        self.get_error_response(self.organization.slug, status_code=400, **data)
+
 
 class OrganizationDeleteTest(OrganizationDetailsTestBase):
     method = "delete"