diff --git a/service/cachemdw/cache.go b/service/cachemdw/cache.go
index d2ff2b7..fe7e3db 100644
--- a/service/cachemdw/cache.go
+++ b/service/cachemdw/cache.go
@@ -41,8 +41,8 @@ func NewServiceCache(
 	}
 }
 
-func (c *ServiceCache) IsCacheable(ctx context.Context, req *decode.EVMRPCRequestEnvelope) bool {
-	blockNumber, err := req.ExtractBlockNumberFromEVMRPCRequest(ctx, c.evmClient)
+func IsCacheable(ctx context.Context, evmClient EVMClient, req *decode.EVMRPCRequestEnvelope) bool {
+	blockNumber, err := req.ExtractBlockNumberFromEVMRPCRequest(ctx, evmClient)
 	if err != nil {
 		return false
 	}
@@ -83,7 +83,7 @@ func (c *ServiceCache) CacheQueryResponse(
 	req *decode.EVMRPCRequestEnvelope,
 	response []byte,
 ) error {
-	if !c.IsCacheable(ctx, req) {
+	if !IsCacheable(ctx, c.evmClient, req) {
 		return errors.New("query isn't cacheable")
 	}
 
diff --git a/service/cachemdw/cache_test.go b/service/cachemdw/cache_test.go
new file mode 100644
index 0000000..378c7ee
--- /dev/null
+++ b/service/cachemdw/cache_test.go
@@ -0,0 +1,65 @@
+package cachemdw
+
+import (
+	"context"
+	"math/big"
+	"testing"
+
+	"github.com/ethereum/go-ethereum/common"
+	ethctypes "github.com/ethereum/go-ethereum/core/types"
+	"github.com/stretchr/testify/require"
+
+	"github.com/kava-labs/kava-proxy-service/decode"
+)
+
+type MockEVMClient struct{}
+
+func NewMockEVMClient() *MockEVMClient {
+	return &MockEVMClient{}
+}
+
+var _ EVMClient = (*MockEVMClient)(nil)
+
+func (c *MockEVMClient) BlockByHash(ctx context.Context, hash common.Hash) (*ethctypes.Block, error) {
+	panic("not implemented")
+}
+
+func (c *MockEVMClient) ChainID(ctx context.Context) (*big.Int, error) {
+	panic("not implemented")
+}
+
+func TestUnitTestIsCacheable(t *testing.T) {
+	evmClient := NewMockEVMClient()
+
+	for _, tc := range []struct {
+		desc      string
+		req       *decode.EVMRPCRequestEnvelope
+		cacheable bool
+	}{
+		{
+			desc: "test case #1",
+			req: &decode.EVMRPCRequestEnvelope{
+				JSONRPCVersion: "2.0",
+				ID:             1,
+				Method:         "eth_getBalance",
+				Params:         []interface{}{"0x1234", "42"},
+			},
+			cacheable: true,
+		},
+		{
+			desc: "test case #2",
+			req: &decode.EVMRPCRequestEnvelope{
+				JSONRPCVersion: "2.0",
+				ID:             1,
+				Method:         "eth_getBalance",
+				Params:         []interface{}{"0x1234", "0"},
+			},
+			cacheable: false,
+		},
+	} {
+		t.Run(tc.desc, func(t *testing.T) {
+			cacheable := IsCacheable(context.Background(), evmClient, tc.req)
+			require.Equal(t, tc.cacheable, cacheable)
+		})
+	}
+}
diff --git a/service/cachemdw/middleware.go b/service/cachemdw/middleware.go
index b04de38..e0258f6 100644
--- a/service/cachemdw/middleware.go
+++ b/service/cachemdw/middleware.go
@@ -38,7 +38,7 @@ func (c *ServiceCache) Middleware(
 			return
 		}
 
-		cacheable := c.IsCacheable(r.Context(), decodedReq)
+		cacheable := IsCacheable(r.Context(), c.evmClient, decodedReq)
 		if !cacheable {
 			next.ServeHTTP(w, r.WithContext(uncachedContext))
 			return