Implement tx costs

src/api/chain.ts

@@ -14,6 +14,7 @@ enum ChainAPIMethods {
   INFO = '/chain/info',
   COSTS = '/chain/info/electionPriceFactors',
   CIRCUITS = '/chain/info/circuit',
+  TX_COSTS = '/chain/transactions/cost',
   TX_INFO = '/chain/transactions/reference',
   TX_INFO_BY_INDEX = '/chain/transactions/reference/index/{index}',
   TX_INFO_BLOCK = '/chain/transactions/{blockHeight}/{txIndex}',
@@ -182,6 +183,26 @@ export enum TransactionType {
   SET_KEYKEEPER_TX = 'setKeykeeper',
 }
 
+export interface IChainTxCosts {
+  costs: {
+    AddDelegateForAccount: number;
+    CollectFaucet: number;
+    CreateAccount: number;
+    DelAccountSIK: number;
+    DelDelegateForAccount: number;
+    NewProcess: number;
+    RegisterKey: number;
+    SendTokens: number;
+    SetAccountInfoURI: number;
+    SetAccountSIK: number;
+    SetAccountValidator: number;
+    SetProcessCensus: number;
+    SetProcessDuration: number;
+    SetProcessQuestionIndex: number;
+    SetProcessStatus: number;
+  };
+}
+
 export interface IChainTxReference {
   /**
    * The number of the transaction.
@@ -487,6 +508,19 @@ export abstract class ChainAPI extends API {
       .catch(this.isApiError);
   }
 
+  /**
+   * Returns the list of transactions and its cost
+   * @param url - API endpoint URL
+   */
+  public static txCosts(url: string): Promise<IChainTxCosts> {
+    return axios
+      .get<IChainTxCosts>(url + ChainAPIMethods.TX_COSTS)
+      .then((response) => {
+        return response.data;
+      })
+      .catch(this.isApiError);
+  }
+
   /**
    * Fetches information about a transaction from the blockchain.
    *