Change vDOT paying asset - fix decimals fetching in destination (#153)

* Change paying token for vDOT transfers and adapt decimals query in destination chain

* add changeset

Author: mmaurello

.changeset/orange-trainers-teach.md

@@ -0,0 +1,6 @@
+---
+'@moonbeam-network/xcm-config': patch
+'@moonbeam-network/xcm-sdk': patch
+---
+
+Change how we get decimals from assets in destination and change vDOT transfers paying asset

packages/config/src/chains.ts

@@ -219,7 +219,7 @@ export const bifrostPolkadot = new Parachain({
   name: 'Bifrost',
   parachainId: 2030,
   ss58Format: 6,
-  ws: 'wss://hk.p.bifrost-rpc.liebi.com/ws',
+  ws: 'wss://eu.bifrost-polkadot-rpc.liebi.com/ws',
 });
 
 export const calamari = new Parachain({

packages/config/src/configs/bifrostPolkadot.ts

@@ -59,11 +59,11 @@ export const bifrostPolkadotConfig = new ChainConfig({
       balance: BalanceBuilder().substrate().tokens().accounts(),
       destination: moonbeam,
       destinationFee: {
-        amount: 0.2,
-        asset: bnc,
-        balance: BalanceBuilder().substrate().system().account(),
+        amount: 0.01,
+        asset: vdot,
+        balance: BalanceBuilder().substrate().tokens().accounts(),
       },
-      extrinsic: ExtrinsicBuilder().xTokens().transferMultiCurrencies(),
+      extrinsic: ExtrinsicBuilder().xTokens().transfer(),
       fee: {
         asset: bnc,
         balance: BalanceBuilder().substrate().system().account(),

packages/sdk/src/getTransferData/getDestinationData.ts

@@ -46,7 +46,12 @@ export async function getDestinationData({
   const balanceAmount = zeroAmount.copyWith({ amount: balance });
   const { existentialDeposit } = polkadot;
 
-  const feeAmount = await getFee({ config: transferConfig, polkadot });
+  const feeAmount = await getFee({
+    address: destinationAddress,
+    config: transferConfig,
+    evmSigner,
+    polkadot,
+  });
   const minAmount = zeroAmount.copyWith({ amount: min });
 
   return {
@@ -59,16 +64,26 @@ export async function getDestinationData({
 }
 
 export interface GetFeeParams {
+  address: string;
   config: TransferConfig;
+  evmSigner?: EvmSigner;
   polkadot: PolkadotService;
 }
 
 export async function getFee({
+  address,
   config,
+  evmSigner,
   polkadot,
 }: GetFeeParams): Promise<AssetAmount> {
   const { amount, asset } = config.source.config.destinationFee;
-  const decimals = await polkadot.getAssetDecimals(asset);
+  const decimals = await getDecimals({
+    address,
+    asset,
+    config: config.destination.config,
+    evmSigner,
+    polkadot,
+  });
   const zeroAmount = AssetAmount.fromAsset(asset, {
     amount: 0n,
     decimals,