diff --git a/pkg/api/api.go b/pkg/api/api.go
index 49613a1..61d8c1c 100644
--- a/pkg/api/api.go
+++ b/pkg/api/api.go
@@ -52,6 +52,7 @@ func decodeJSONResponse(url string, httpResp *http.Response, response interface{
 	}
 
 	bodyStr := strings.TrimSpace(string(body))
+
 	if err := json.Unmarshal(body, response); err != nil {
 		retryable = isRetryableHTTPResponse(httpResp.StatusCode, bodyStr)
 		log.Errorf(
diff --git a/test/integration/api/allocation/invalid_query_parameter_test.go b/test/integration/api/allocation/invalid_query_parameter_test.go
new file mode 100644
index 0000000..9485b83
--- /dev/null
+++ b/test/integration/api/allocation/invalid_query_parameter_test.go
@@ -0,0 +1,89 @@
+package allocation
+
+// Validates that allocation api handles invalid parameters correctly.
+// Passing Criteria:
+// Returns a HTTP 400 error instead of a response with no error or an HTTP 500 error.
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/opencost/opencost-integration-tests/pkg/api"
+)
+
+func TestAllocationInvalidParameters(t *testing.T) {
+	apiObj := api.NewAPI()
+
+	invalidParameterTestCases := []struct {
+		name        string
+		window      string
+		filter      string
+		aggregate   string
+		accumulate  string
+		includeidle string
+	}{
+		{
+			name:      "ReverseWindow",
+			window:    "2026-06-16T00:00:00Z,2026-06-15T00:00:00Z",
+			aggregate: "namespace",
+		},
+		{
+			name:      "InvalidWindowFormat",
+			window:    "invalid-window-format",
+			aggregate: "namespace",
+		},
+		{
+			name:        "InvalidAggregate",
+			window:      "24h",
+			aggregate:   "invalid-aggregate",
+			accumulate:  "true",
+			includeidle: "true",
+		},
+		{
+			name:        "InvalidFilter",
+			window:      "24h",
+			filter:      "invalid-filter",
+			accumulate:  "true",
+			includeidle: "true",
+			aggregate:   "namespace",
+		},
+		{
+			name:        "InvalidAccumulate",
+			window:      "24h",
+			accumulate:  "invalid-accumulate",
+			includeidle: "true",
+			aggregate:   "namespace",
+		},
+		{
+			name:        "InvalidIncludeIdle",
+			window:      "24h",
+			accumulate:  "true",
+			includeidle: "invalid-include-idle",
+			aggregate:   "namespace",
+		},
+	}
+
+	for _, tc := range invalidParameterTestCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Logf("Testing: %s", tc.name)
+
+			_, err := apiObj.GetAllocation(api.AllocationRequest{
+				Window:      tc.window,
+				Filter:      tc.filter,
+				Accumulate:  tc.accumulate,
+				IncludeIdle: tc.includeidle,
+				Aggregate:   tc.aggregate,
+			})
+
+			// Assert that an error was returned since input is invalid.
+			if err == nil {
+				t.Fatalf("Expected an error for invalid input, but got a successful response")
+			}
+
+			// Assert that it is a 400 error.
+			if !strings.Contains(err.Error(), "HTTP 400") {
+				t.Fatalf("expected HTTP 400 error, got %v", err)
+			}
+		})
+	}
+}
diff --git a/test/integration/api/allocation/test.bats b/test/integration/api/allocation/test.bats
index 2d41bd7..9f5c736 100644
--- a/test/integration/api/allocation/test.bats
+++ b/test/integration/api/allocation/test.bats
@@ -6,6 +6,7 @@ setup() {
 teardown() {
     : # nothing to tear down
 }
+
 @test "allocation: controller kind consistency" {
     go test allocation_controller_consistency_test.go
 }
@@ -45,3 +46,7 @@ teardown() {
 @test "validate_api: validate if all of idle costs are spread" {
     go test share_idle_shares_test.go
 }
+
+@test "validate_api: validate api can handle invalid parameters" {
+    go test invalid_query_parameter_test.go
+}
diff --git a/test/integration/api/asset/invalid_query_parameter_test.go b/test/integration/api/asset/invalid_query_parameter_test.go
new file mode 100644
index 0000000..e8277e7
--- /dev/null
+++ b/test/integration/api/asset/invalid_query_parameter_test.go
@@ -0,0 +1,57 @@
+package assets
+
+// Validates that assets api handles invalid parameters correctly.
+// Passing Criteria:
+// Returns a HTTP 400 error instead of a response with no error or an HTTP 500 error.
+
+import (
+	"strings"
+	"testing"
+
+	"github.com/opencost/opencost-integration-tests/pkg/api"
+)
+
+func TestAssetInvalidParameters(t *testing.T) {
+	apiObj := api.NewAPI()
+
+	invalidParameterTestCases := []struct {
+		name      string
+		window    string
+		assetType string
+	}{
+		{
+			name:      "ReverseWindow",
+			window:    "2026-06-16T00:00:00Z,2026-06-15T00:00:00Z",
+			assetType: "node",
+		},
+		{
+			name:      "InvalidWindowFormat",
+			window:    "invalid-window-format",
+			assetType: "node",
+		},
+		{
+			name:      "InvalidFilter",
+			window:    "24h",
+			assetType: "invalid-filter",
+		},
+	}
+
+	for _, tc := range invalidParameterTestCases {
+		t.Run(tc.name, func(t *testing.T) {
+			t.Logf("Testing: %s", tc.name)
+
+			_, err := apiObj.GetAssets(api.AssetsRequest{
+				Window: tc.window,
+				Filter: tc.assetType,
+			})
+
+			if err == nil {
+				t.Fatalf("Expected an error for invalid input, but got a successful response")
+			}
+
+			if !strings.Contains(err.Error(), "HTTP 400") {
+				t.Fatalf("expected HTTP 400 error, got %v", err)
+			}
+		})
+	}
+}
diff --git a/test/integration/api/asset/test.bats b/test/integration/api/asset/test.bats
index a642c16..f66f6f1 100644
--- a/test/integration/api/asset/test.bats
+++ b/test/integration/api/asset/test.bats
@@ -7,6 +7,10 @@ teardown() {
     : # nothing to tear down
 }
 
+@test "asset: Invalid Parameters" {
+    go test invalid_query_parameter_test.go
+}
+
 @test "asset: Node Labels" {
     go test node_labels_test.go
 }