diff --git a/app/eth2wrap/eth2wrap.go b/app/eth2wrap/eth2wrap.go
index bdbe73dca..d9980670e 100644
--- a/app/eth2wrap/eth2wrap.go
+++ b/app/eth2wrap/eth2wrap.go
@@ -17,6 +17,7 @@ import (
 	"github.com/prometheus/client_golang/prometheus"
 
 	"github.com/obolnetwork/charon/app/errors"
+	"github.com/obolnetwork/charon/app/featureset"
 	"github.com/obolnetwork/charon/app/forkjoin"
 	"github.com/obolnetwork/charon/app/promauto"
 	"github.com/obolnetwork/charon/app/z"
@@ -74,13 +75,16 @@ func NewMultiHTTP(timeout time.Duration, addresses ...string) (Client, error) {
 	for _, address := range addresses {
 		address := address // Capture range variable.
 
+		parameters := []eth2http.Parameter{
+			eth2http.WithLogLevel(zeroLogInfo),
+			eth2http.WithAddress(address),
+			eth2http.WithTimeout(timeout),
+			eth2http.WithAllowDelayedStart(true),
+			eth2http.WithEnforceJSON(featureset.Enabled(featureset.JSONRequests)),
+		}
+
 		cl := newLazy(func(ctx context.Context) (Client, error) {
-			eth2Svc, err := eth2http.New(ctx,
-				eth2http.WithLogLevel(zeroLogInfo),
-				eth2http.WithAddress(address),
-				eth2http.WithTimeout(timeout),
-				eth2http.WithAllowDelayedStart(true),
-			)
+			eth2Svc, err := eth2http.New(ctx, parameters...)
 			if err != nil {
 				return nil, wrapError(ctx, err, "new eth2 client", z.Str("address", address))
 			}
diff --git a/app/featureset/featureset.go b/app/featureset/featureset.go
index 6fc3804fb..4b0eaf5e1 100644
--- a/app/featureset/featureset.go
+++ b/app/featureset/featureset.go
@@ -37,6 +37,9 @@ const (
 
 	// AggSigDBV2 enables a newer, simpler implementation of `aggsigdb`.
 	AggSigDBV2 Feature = "aggsigdb_v2"
+
+	// JSONRequests enables JSON requests for eth2 client.
+	JSONRequests Feature = "json_requests"
 )
 
 var (
@@ -46,6 +49,7 @@ var (
 		ConsensusParticipate: statusStable,
 		MockAlpha:            statusAlpha,
 		AggSigDBV2:           statusAlpha,
+		JSONRequests:         statusAlpha,
 		// Add all features and there status here.
 	}
 
diff --git a/app/featureset/featureset_internal_test.go b/app/featureset/featureset_internal_test.go
index 1f422b4e1..6c07a0ad5 100644
--- a/app/featureset/featureset_internal_test.go
+++ b/app/featureset/featureset_internal_test.go
@@ -14,6 +14,7 @@ func TestAllFeatureStatus(t *testing.T) {
 		MockAlpha,
 		EagerDoubleLinear,
 		ConsensusParticipate,
+		JSONRequests,
 	}
 
 	for _, feature := range features {
diff --git a/app/featureset/status_string.go b/app/featureset/status_string.go
index 4272384ef..fb2430e58 100644
--- a/app/featureset/status_string.go
+++ b/app/featureset/status_string.go
@@ -10,19 +10,30 @@ func _() {
 	// An "invalid array index" compiler error signifies that the constant values have changed.
 	// Re-run the stringer command to generate them again.
 	var x [1]struct{}
+	_ = x[enable-9223372036854775807]
+	_ = x[disable-0]
 	_ = x[statusAlpha-1]
 	_ = x[statusBeta-2]
 	_ = x[statusStable-3]
+	_ = x[statusSentinel-4]
 }
 
-const _status_name = "AlphaBetaStable"
+const (
+	_status_name_0 = "disableAlphaBetaStableSentinel"
+	_status_name_1 = "enable"
+)
 
-var _status_index = [...]uint8{0, 5, 9, 15}
+var (
+	_status_index_0 = [...]uint8{0, 7, 12, 16, 22, 30}
+)
 
 func (i status) String() string {
-	i -= 1
-	if i < 0 || i >= status(len(_status_index)-1) {
-		return "status(" + strconv.FormatInt(int64(i+1), 10) + ")"
+	switch {
+	case 0 <= i && i <= 4:
+		return _status_name_0[_status_index_0[i]:_status_index_0[i+1]]
+	case i == 9223372036854775807:
+		return _status_name_1
+	default:
+		return "status(" + strconv.FormatInt(int64(i), 10) + ")"
 	}
-	return _status_name[_status_index[i]:_status_index[i+1]]
 }