diff --git a/cmd/mailchain/internal/http/handlers/protocols.go b/cmd/mailchain/internal/http/handlers/protocols.go
index afba1fd5f..60dccc97e 100644
--- a/cmd/mailchain/internal/http/handlers/protocols.go
+++ b/cmd/mailchain/internal/http/handlers/protocols.go
@@ -33,15 +33,18 @@ func GetProtocols(base *settings.Root) func(w http.ResponseWriter, r *http.Reque
 			continue
 		}
 
-		networks := []string{}
-
+		networks := []Network{}
 		for _, network := range protocol.Networks {
-			if !network.Disabled() {
-				networks = append(networks, network.Kind())
+			if !network.Disabled() && protocol.Kind == "ethereum" {
+				networks = append(networks, Network{Name: network.Kind(), ID: ""})
+			} else if !network.Disabled() && protocol.Kind == "substrate" {
+				if network.Kind() == "edgeware-testnet" {
+					networks = append(networks, Network{Name: network.Kind(), ID: "42"})
+				}
 			}
 		}
 
-		sort.Strings(networks)
+		sort.Slice(networks, func(i, j int) bool { return networks[i].Name < networks[j].Name })
 		resP := GetProtocolsProtocol{
 			Name:     protocol.Kind,
 			Networks: networks,
@@ -72,10 +75,14 @@ type GetProtocolsResponse struct {
 	Protocols []GetProtocolsProtocol `json:"protocols"`
 }
 
-// GetProtocolsProtocol body
+type Network struct {
+	Name string `json:"name"`
+	ID   string `json:"id"`
+}
+
 type GetProtocolsProtocol struct {
 	// in: body
 	Name string `json:"name"`
 	// in: body
-	Networks []string `json:"networks"`
+	Networks []Network `json:"networks"`
 }
diff --git a/cmd/mailchain/internal/http/handlers/protocols_test.go b/cmd/mailchain/internal/http/handlers/protocols_test.go
index 2cbe23fe6..d3cb227cd 100644
--- a/cmd/mailchain/internal/http/handlers/protocols_test.go
+++ b/cmd/mailchain/internal/http/handlers/protocols_test.go
@@ -67,7 +67,7 @@ func TestGetProtocols(t *testing.T) {
 					return settings.FromStore(m)
 				}(),
 			},
-			"{\"protocols\":[{\"name\":\"ethereum\",\"networks\":[\"kovan\",\"mainnet\",\"rinkeby\",\"ropsten\"]}]}\n",
+			"{\"protocols\":[{\"name\":\"ethereum\",\"networks\":[{\"name\":\"kovan\",\"id\":\"\"},{\"name\":\"mainnet\",\"id\":\"\"},{\"name\":\"rinkeby\",\"id\":\"\"},{\"name\":\"ropsten\",\"id\":\"\"}]}]}\n",
 			http.StatusOK,
 		},
 		{
@@ -81,7 +81,21 @@ func TestGetProtocols(t *testing.T) {
 					return settings.FromStore(m)
 				}(),
 			},
-			"{\"protocols\":[{\"name\":\"ethereum\",\"networks\":[\"goerli\",\"kovan\",\"mainnet\",\"rinkeby\",\"ropsten\"]}]}\n",
+			"{\"protocols\":[{\"name\":\"ethereum\",\"networks\":[{\"name\":\"goerli\",\"id\":\"\"},{\"name\":\"kovan\",\"id\":\"\"},{\"name\":\"mainnet\",\"id\":\"\"},{\"name\":\"rinkeby\",\"id\":\"\"},{\"name\":\"ropsten\",\"id\":\"\"}]}]}\n",
+			http.StatusOK,
+		},
+		{
+			"default-substrate",
+			args{
+				func() *settings.Root {
+					m := valuestest.NewMockStore(mockCtrl)
+					m.EXPECT().IsSet("protocols.ethereum.disabled").Return(true)
+					m.EXPECT().GetBool("protocols.ethereum.disabled").Return(true)
+					m.EXPECT().IsSet(gomock.Any()).Return(false).AnyTimes()
+					return settings.FromStore(m)
+				}(),
+			},
+			"{\"protocols\":[{\"name\":\"substrate\",\"networks\":[{\"name\":\"edgeware-testnet\",\"id\":\"42\"}]}]}\n",
 			http.StatusOK,
 		},
 	}
diff --git a/cmd/mailchain/internal/settings/root.go b/cmd/mailchain/internal/settings/root.go
index 38ef520e8..2904fdec1 100644
--- a/cmd/mailchain/internal/settings/root.go
+++ b/cmd/mailchain/internal/settings/root.go
@@ -30,6 +30,8 @@ func FromStore(s values.Store) *Root {
 			}),
 			protocols.Substrate: protocol(s, protocols.Substrate, map[string]NetworkClient{
 				substrate.EdgewareTestnet: network(s, protocols.Substrate, substrate.EdgewareTestnet, defaults.SubstrateNetworkAny()),
+				// substrate.PolkadotTestnet: network(s, protocols.Substrate, substrate.PolkadotTestnet, defaults.SubstrateNetworkAny()),
+				// substrate.KusamaTestnet:   network(s, protocols.Substrate, substrate.KusamaTestnet, defaults.SubstrateNetworkAny()),
 			}),
 		},
 		// other
diff --git a/internal/protocols/substrate/address.go b/internal/protocols/substrate/address.go
index 64e3a2902..182ee5677 100644
--- a/internal/protocols/substrate/address.go
+++ b/internal/protocols/substrate/address.go
@@ -58,6 +58,12 @@ func prefixWithNetwork(network string, publicKey crypto.PublicKey) ([]byte, erro
 	case EdgewareTestnet:
 		// 42 = 0x2a
 		return append([]byte{0x2a}, publicKey.Bytes()...), nil
+	case PolkadotTestnet:
+		// 0 = 0x00
+		return append([]byte{0x00}, publicKey.Bytes()...), nil
+	case KusamaTestnet:
+		// 2 = 0x02
+		return append([]byte{0x02}, publicKey.Bytes()...), nil
 	default:
 		return nil, errors.Errorf("unknown address prefix for %q", network)
 	}
diff --git a/internal/protocols/substrate/address_test.go b/internal/protocols/substrate/address_test.go
index 13163958d..d96c20fbf 100644
--- a/internal/protocols/substrate/address_test.go
+++ b/internal/protocols/substrate/address_test.go
@@ -54,6 +54,42 @@ func Test_prefixWithNetwork(t *testing.T) {
 			nil,
 			true,
 		},
+		{
+			"polkadot-testnet",
+			args{
+				"polkadot-testnet",
+				ed25519test.SofiaPublicKey,
+			},
+			[]byte{0x00, 0x72, 0x3c, 0xaa, 0x23, 0xa5, 0xb5, 0x11, 0xaf, 0x5a, 0xd7, 0xb7, 0xef, 0x60, 0x76, 0xe4, 0x14, 0xab, 0x7e, 0x75, 0xa9, 0xdc, 0x91, 0xe, 0xa6, 0xe, 0x41, 0x7a, 0x2b, 0x77, 0xa, 0x56, 0x71},
+			false,
+		},
+		{
+			"invalid",
+			args{
+				"invalid",
+				ed25519test.SofiaPublicKey,
+			},
+			nil,
+			true,
+		},
+		{
+			"kusama-testnet",
+			args{
+				"kusama-testnet",
+				ed25519test.SofiaPublicKey,
+			},
+			[]byte{0x02, 0x72, 0x3c, 0xaa, 0x23, 0xa5, 0xb5, 0x11, 0xaf, 0x5a, 0xd7, 0xb7, 0xef, 0x60, 0x76, 0xe4, 0x14, 0xab, 0x7e, 0x75, 0xa9, 0xdc, 0x91, 0xe, 0xa6, 0xe, 0x41, 0x7a, 0x2b, 0x77, 0xa, 0x56, 0x71},
+			false,
+		},
+		{
+			"invalid",
+			args{
+				"invalid",
+				ed25519test.SofiaPublicKey,
+			},
+			nil,
+			true,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -126,6 +162,24 @@ func TestSS58AddressFormat(t *testing.T) {
 			[]byte{0x2a, 0x2e, 0x32, 0x2f, 0x87, 0x40, 0xc6, 0x1, 0x72, 0x11, 0x1a, 0xc8, 0xea, 0xdc, 0xdd, 0xa2, 0x51, 0x2f, 0x90, 0xd0, 0x6d, 0xe, 0x50, 0x3e, 0xf1, 0x89, 0x97, 0x9a, 0x15, 0x9b, 0xec, 0xe1, 0xe8, 0x6d, 0x48},
 			false,
 		},
+		{
+			"success-sofia-polkadot-testnet",
+			args{
+				"polkadot-testnet",
+				ed25519test.SofiaPublicKey,
+			},
+			[]byte{0x0, 0x72, 0x3c, 0xaa, 0x23, 0xa5, 0xb5, 0x11, 0xaf, 0x5a, 0xd7, 0xb7, 0xef, 0x60, 0x76, 0xe4, 0x14, 0xab, 0x7e, 0x75, 0xa9, 0xdc, 0x91, 0xe, 0xa6, 0xe, 0x41, 0x7a, 0x2b, 0x77, 0xa, 0x56, 0x71, 0x90, 0x66},
+			false,
+		},
+		{
+			"success-charlotte-polkadot-testnet",
+			args{
+				"polkadot-testnet",
+				ed25519test.CharlottePublicKey,
+			},
+			[]byte{0x0, 0x2e, 0x32, 0x2f, 0x87, 0x40, 0xc6, 0x1, 0x72, 0x11, 0x1a, 0xc8, 0xea, 0xdc, 0xdd, 0xa2, 0x51, 0x2f, 0x90, 0xd0, 0x6d, 0xe, 0x50, 0x3e, 0xf1, 0x89, 0x97, 0x9a, 0x15, 0x9b, 0xec, 0xe1, 0xe8, 0x93, 0x8d},
+			false,
+		},
 		{
 			"err-network",
 			args{
diff --git a/internal/protocols/substrate/substrate.go b/internal/protocols/substrate/substrate.go
index 413f883c7..eb7ee911b 100644
--- a/internal/protocols/substrate/substrate.go
+++ b/internal/protocols/substrate/substrate.go
@@ -17,6 +17,12 @@ package substrate
 const (
 	// EdgewareTestnet network name.
 	EdgewareTestnet = "edgeware-testnet"
+
+	// PolkadotTestnet network name
+	PolkadotTestnet = "polkadot-testnet"
+
+	// KusamaTestnet network name
+	KusamaTestnet = "kusama-testnet"
 )
 
 // Networks supported by substrate package.