diff --git a/bsc/wbnb.go b/bsc/wbnb.go
index 2a5e4fc..0d0ab4c 100644
--- a/bsc/wbnb.go
+++ b/bsc/wbnb.go
@@ -12,11 +12,11 @@ import (
 
 type WBNB struct {
 	evm.Token
-	client   evm.Client
+	client   *Client
 	contract *contracts.WBnb
 }
 
-func NewWBNB(client evm.Client) (*WBNB, error) {
+func NewWBNB(client *Client) (*WBNB, error) {
 	address, err := client.TokenService().TokenAddressBySymbol("WBNB")
 	if err != nil {
 		return nil, errors.Wrap(err, "getting wbnb address")
diff --git a/pancakeswap/masterchef.go b/pancakeswap/masterchef.go
index 08a76df..7ec01d1 100644
--- a/pancakeswap/masterchef.go
+++ b/pancakeswap/masterchef.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	"git.lehouerou.net/laurent/evm/bsc"
+
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/pancakeswap/contracts"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
@@ -16,13 +18,13 @@ import (
 const MasterChefAddress = "0x73feaa1eE314F8c655E354234017bE2193C9E24E"
 
 type MasterChef struct {
-	client   evm.Client
+	client   *bsc.Client
 	contract *contracts.MasterChef
 
 	cake evm.Token
 }
 
-func NewMasterChef(client evm.Client) (*MasterChef, error) {
+func NewMasterChef(client *bsc.Client) (*MasterChef, error) {
 	c, err := contracts.NewMasterChef(common.HexToAddress(MasterChefAddress), client)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/pancakeswap/nftmarket.go b/pancakeswap/nftmarket.go
index 8833953..ed4f332 100644
--- a/pancakeswap/nftmarket.go
+++ b/pancakeswap/nftmarket.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	"git.lehouerou.net/laurent/evm/bsc"
+
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/pancakeswap/contracts"
 
@@ -19,12 +21,12 @@ const (
 )
 
 type NftMarket struct {
-	client   evm.Client
+	client   *bsc.Client
 	contract *contracts.NftMarket
 	wbnb     evm.Token
 }
 
-func NewNftMarket(client evm.Client) (*NftMarket, error) {
+func NewNftMarket(client *bsc.Client) (*NftMarket, error) {
 	contract, err := contracts.NewNftMarket(common.HexToAddress(MarketAddress), client)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/pancakeswap/router.go b/pancakeswap/router.go
index 1fbd320..0fcaf8c 100644
--- a/pancakeswap/router.go
+++ b/pancakeswap/router.go
@@ -2,6 +2,7 @@ package pancakeswap
 
 import (
 	"git.lehouerou.net/laurent/evm"
+	"git.lehouerou.net/laurent/evm/bsc"
 	"git.lehouerou.net/laurent/evm/pancakeswap/contracts"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
@@ -11,7 +12,7 @@ const (
 	RouterAddress = "0x10ED43C718714eb63d5aA57B78B54704E256024E"
 )
 
-func NewRouter(client evm.Client) (*evm.UniswapRouter, error) {
+func NewRouter(client *bsc.Client) (*evm.UniswapRouter, error) {
 	contract, err := contracts.NewRouter(common.HexToAddress(RouterAddress), client)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/polycat/catpair.go b/polycat/catpair.go
index 0e88778..39a09f1 100644
--- a/polycat/catpair.go
+++ b/polycat/catpair.go
@@ -3,6 +3,7 @@ package polycat
 import (
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/polycat/contracts"
+	"git.lehouerou.net/laurent/evm/polygon"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
@@ -14,7 +15,7 @@ type CatPair struct {
 	paircontract *contracts.CatPair
 }
 
-func NewCatPair(client evm.Client, address common.Address) (*CatPair, error) {
+func NewCatPair(client *polygon.Client, address common.Address) (*CatPair, error) {
 	t, err := client.TokenService().TokenByAddress(address)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/polycat/catrouter.go b/polycat/catrouter.go
index feb4ed8..bddfd1b 100644
--- a/polycat/catrouter.go
+++ b/polycat/catrouter.go
@@ -3,13 +3,14 @@ package polycat
 import (
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/polycat/contracts"
+	"git.lehouerou.net/laurent/evm/polygon"
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/pkg/errors"
 )
 
 const CatRouterAddress = "0x94930a328162957FF1dd48900aF67B5439336cBD"
 
-func NewCatRouterService(c evm.Client) (*evm.UniswapRouter, error) {
+func NewCatRouterService(c *polygon.Client) (*evm.UniswapRouter, error) {
 	contract, err := contracts.NewCatRouter(common.HexToAddress(CatRouterAddress), c)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/polycat/masterchef.go b/polycat/masterchef.go
index cfc18e8..ceb17d1 100644
--- a/polycat/masterchef.go
+++ b/polycat/masterchef.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	"git.lehouerou.net/laurent/evm/polygon"
+
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/polycat/contracts"
 	"github.com/ethereum/go-ethereum/common"
@@ -18,11 +20,11 @@ const (
 )
 
 type MasterchefService struct {
-	client   evm.Client
+	client   *polygon.Client
 	contract *contracts.Masterchef
 }
 
-func NewMasterchefService(c evm.Client) (*MasterchefService, error) {
+func NewMasterchefService(c *polygon.Client) (*MasterchefService, error) {
 	contract, err := contracts.NewMasterchef(common.HexToAddress(MasterchefAddress), c)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/polycat/masterchefv2.go b/polycat/masterchefv2.go
index bcadb45..ef8f45f 100644
--- a/polycat/masterchefv2.go
+++ b/polycat/masterchefv2.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	"git.lehouerou.net/laurent/evm/polygon"
+
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/polycat/contracts"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
@@ -18,11 +20,11 @@ const (
 )
 
 type Masterchefv2Service struct {
-	client   evm.Client
+	client   *polygon.Client
 	contract *contracts.MasterChefv2
 }
 
-func NewMasterchefv2Service(c evm.Client) (*Masterchefv2Service, error) {
+func NewMasterchefv2Service(c *polygon.Client) (*Masterchefv2Service, error) {
 	contract, err := contracts.NewMasterChefv2(common.HexToAddress(Masterchefv2Address), c)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/polycat/rewardlocker.go b/polycat/rewardlocker.go
index 79e2b4d..ab64651 100644
--- a/polycat/rewardlocker.go
+++ b/polycat/rewardlocker.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	"git.lehouerou.net/laurent/evm/polygon"
+
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/polycat/contracts"
 	"github.com/ethereum/go-ethereum/accounts/abi/bind"
@@ -16,11 +18,11 @@ import (
 const RewardLockerAddress = "0xE0e44d4E7e61f2f4f990f5F4e2408D2187315C94"
 
 type RewardLockerService struct {
-	client   evm.Client
+	client   *polygon.Client
 	contract *contracts.RewardLocker
 }
 
-func NewRewardLockerService(c evm.Client) (*RewardLockerService, error) {
+func NewRewardLockerService(c *polygon.Client) (*RewardLockerService, error) {
 	contract, err := contracts.NewRewardLocker(common.HexToAddress(RewardLockerAddress), c)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")
diff --git a/polycat/tankchef.go b/polycat/tankchef.go
index 241c74e..09ac1b8 100644
--- a/polycat/tankchef.go
+++ b/polycat/tankchef.go
@@ -4,6 +4,8 @@ import (
 	"context"
 	"math/big"
 
+	"git.lehouerou.net/laurent/evm/polygon"
+
 	"git.lehouerou.net/laurent/evm"
 	"git.lehouerou.net/laurent/evm/polycat/contracts"
 	"github.com/ethereum/go-ethereum/common"
@@ -13,11 +15,11 @@ import (
 )
 
 type TankChefService struct {
-	client   evm.Client
+	client   *polygon.Client
 	contract *contracts.TankChef
 }
 
-func NewTankChefService(c evm.Client, address string) (*TankChefService, error) {
+func NewTankChefService(c *polygon.Client, address string) (*TankChefService, error) {
 	contract, err := contracts.NewTankChef(common.HexToAddress(address), c)
 	if err != nil {
 		return nil, errors.Wrap(err, "init contract")