diff --git a/cmd/solana_exporter/slots.go b/cmd/solana_exporter/slots.go
index 8eb4f51..77017a1 100644
--- a/cmd/solana_exporter/slots.go
+++ b/cmd/solana_exporter/slots.go
@@ -337,7 +337,7 @@ func (c *SlotWatcher) fetchAndEmitSingleFeeReward(
 		var rpcError *rpc.RPCError
 		if errors.As(err, &rpcError) {
 			// this is the error code for slot was skipped:
-			if rpcError.Code == -32007 && strings.Contains(rpcError.Message, "skipped") {
+			if rpcError.Code == rpc.SlotSkippedCode && strings.Contains(rpcError.Message, "skipped") {
 				klog.Infof("slot %v was skipped, no fee rewards.", slot)
 				return nil
 			}
diff --git a/pkg/rpc/errors.go b/pkg/rpc/errors.go
new file mode 100644
index 0000000..5e3fb9f
--- /dev/null
+++ b/pkg/rpc/errors.go
@@ -0,0 +1,23 @@
+package rpc
+
+// error codes: https://github.com/anza-xyz/agave/blob/489f483e1d7b30ef114e0123994818b2accfa389/rpc-client-api/src/custom_error.rs#L17
+const (
+	BlockCleanedUpCode                           = -32001
+	SendTransactionPreflightFailureCode          = -32002
+	TransactionSignatureVerificationFailureCode  = -32003
+	BlockNotAvailableCode                        = -32004
+	NodeUnhealthyCode                            = -32005
+	TransactionPrecompileVerificationFailureCode = -32006
+	SlotSkippedCode                              = -32007
+	NoSnapshotCode                               = -32008
+	LongTermStorageSlotSkippedCode               = -32009
+	KeyExcludedFromSecondaryIndexCode            = -32010
+	TransactionHistoryNotAvailableCode           = -32011
+	ScanErrorCode                                = -32012
+	TransactionSignatureLengthMismatchCode       = -32013
+	BlockStatusNotYetAvailableCode               = -32014
+	UnsupportedTransactionVersionCode            = -32015
+	MinContextSlotNotReachedCode                 = -32016
+	EpochRewardsPeriodActiveCode                 = -32017
+	SlotNotEpochBoundaryCode                     = -32018
+)