diff --git a/aws/cwatch/base.go b/aws/cwatch/base.go
new file mode 100644
index 0000000..ff661a0
--- /dev/null
+++ b/aws/cwatch/base.go
@@ -0,0 +1,15 @@
+package cwatch
+
+import (
+	"sync"
+
+	"github.com/aws/aws-sdk-go-v2/service/cloudwatch"
+	"github.com/aws/aws-sdk-go-v2/service/cloudwatch/types"
+)
+
+type CWService interface {
+	Queue(d types.MetricDatum)
+	StartQueue(wg *sync.WaitGroup)
+	StopQueue()
+	Prepare(data []types.MetricDatum) *cloudwatch.PutMetricDataInput
+}
diff --git a/aws/cwatch/service.go b/aws/cwatch/service.go
index 02f43db..613104b 100644
--- a/aws/cwatch/service.go
+++ b/aws/cwatch/service.go
@@ -71,3 +71,5 @@ func (s *Service) processBatch(batch []types.MetricDatum) {
 		slog.Error("error sending metrics to cloudwatch", "error", err, "count", len(batch))
 	}
 }
+
+var _ CWService = (*Service)(nil)