diff --git a/ftmclient/abft_api.go b/ftmclient/abft_api.go
index 173b40f82..e23a7a147 100644
--- a/ftmclient/abft_api.go
+++ b/ftmclient/abft_api.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"math/big"
 
+	"github.com/Fantom-foundation/lachesis-base/inter/idx"
 	"github.com/ethereum/go-ethereum"
 	"github.com/ethereum/go-ethereum/common/hexutil"
 
@@ -11,9 +12,9 @@ import (
 )
 
 // GetValidators returns Lachesis event by hash or short ID.
-func (ec *Client) GetValidators(ctx context.Context, epoch *big.Int) (inter.ValidatorProfiles, error) {
+func (ec *Client) GetValidators(ctx context.Context, epoch idx.Epoch) (inter.ValidatorProfiles, error) {
 	var raw map[hexutil.Uint64]interface{}
-	err := ec.c.CallContext(ctx, &raw, "abft_getValidators", toBlockNumArg(epoch))
+	err := ec.c.CallContext(ctx, &raw, "abft_getValidators", toBlockNumArg(big.NewInt(int64(epoch))))
 	if err != nil {
 		return nil, err
 	} else if len(raw) == 0 {
diff --git a/ftmclient/ftm_api.go b/ftmclient/ftm_api.go
new file mode 100644
index 000000000..18bfdf484
--- /dev/null
+++ b/ftmclient/ftm_api.go
@@ -0,0 +1,17 @@
+package ftmclient
+
+import (
+	"context"
+	"math/big"
+
+	"github.com/Fantom-foundation/lachesis-base/inter/idx"
+	"github.com/ethereum/go-ethereum/common/hexutil"
+)
+
+// GetEpochBlock returns block height in a beginning of an epoch.
+func (ec *Client) GetEpochBlock(ctx context.Context, epoch idx.Epoch) (idx.Block, error) {
+	var raw hexutil.Uint64
+	err := ec.c.CallContext(ctx, &raw, "ftm_getEpochBlock", toBlockNumArg(big.NewInt(int64(epoch))))
+
+	return idx.Block(raw), err
+}