assetRate: {
      AssetRateCreated: AugmentedEvent<ApiType, [assetKind: u32, rate: u128], { assetKind: u32, rate: u128 }>;
      AssetRateRemoved: AugmentedEvent<ApiType, [assetKind: u32], { assetKind: u32 }>;
      AssetRateUpdated: AugmentedEvent<ApiType, [assetKind: u32, old: u128, new_: u128], { assetKind: u32, old: u128, new_: u128 }>;
      /**