diff --git a/pkg/cannon/iterator/epoch_defaults.go b/pkg/cannon/iterator/epoch_defaults.go
new file mode 100644
index 00000000..991631c2
--- /dev/null
+++ b/pkg/cannon/iterator/epoch_defaults.go
@@ -0,0 +1,38 @@
+package iterator
+
+import (
+	"github.com/attestantio/go-eth2-client/spec"
+	"github.com/attestantio/go-eth2-client/spec/phase0"
+	"github.com/ethpandaops/beacon/pkg/beacon/state"
+	"github.com/ethpandaops/xatu/pkg/proto/xatu"
+)
+
+func NewEpochDefaultsFromForkEpochs(forkEpochs state.ForkEpochs) map[xatu.CannonType]phase0.Epoch {
+	var (
+		bellatrixEpoch,
+		capellaEpoch,
+		denebEpoch phase0.Epoch
+	)
+
+	bellatrix, err := forkEpochs.GetByName(spec.DataVersionBellatrix.String())
+	if err == nil {
+		bellatrixEpoch = bellatrix.Epoch
+	}
+
+	capella, err := forkEpochs.GetByName(spec.DataVersionCapella.String())
+	if err == nil {
+		capellaEpoch = capella.Epoch
+	}
+
+	deneb, err := forkEpochs.GetByName(spec.DataVersionDeneb.String())
+	if err == nil {
+		denebEpoch = deneb.Epoch
+	}
+
+	return map[xatu.CannonType]phase0.Epoch{
+		xatu.CannonType_BEACON_API_ETH_V2_BEACON_BLOCK_BLS_TO_EXECUTION_CHANGE: capellaEpoch,
+		xatu.CannonType_BEACON_API_ETH_V2_BEACON_BLOCK_WITHDRAWAL:              capellaEpoch,
+		xatu.CannonType_BEACON_API_ETH_V2_BEACON_BLOCK_EXECUTION_TRANSACTION:   bellatrixEpoch,
+		xatu.CannonType_BEACON_API_ETH_V1_BEACON_BLOB_SIDECAR:                  denebEpoch,
+	}
+}