diff --git a/src/provider.ts b/src/provider.ts
index b17fcba..5ae2ac7 100644
--- a/src/provider.ts
+++ b/src/provider.ts
@@ -16,6 +16,7 @@ import {
     GetNFTsByOwnerReply,
     GetNFTsByOwnerRequest,
     GetNftTransfersReply,
+    GetNftTransfersRequest,
     GetTokenHoldersCountReply,
     GetTokenHoldersCountRequest,
     GetTokenHoldersReply,
@@ -45,84 +46,40 @@ export class AnkrProvider {
     requestConfig: AxiosRequestConfig
     _nextId: number
 
-    /**
-     * Constructs an instance of AnkrProvider.
-     * @param endpoint Advanced API endpoint. Example: https://rpc.ankr.com/multichain/YOUR-TOKEN
-     */
     constructor(endpoint: string) {
         this.url = endpoint
         this.requestConfig = {headers: {'Content-Type': 'application/json', 'Accept-Encoding': 'gzip'}};
         this._nextId = 1
     }
 
-    /**
-     * Returns the array of Log matching the filter.
-     * @param params A GetLogsRequest object.
-     * @returns Promise<GetLogsReply>
-     */
     async getLogs(params: GetLogsRequest): Promise<GetLogsReply> {
         return this.send<GetLogsReply>("ankr_getLogs", params)
     }
 
-    /**
-     * Returns the array of Block within specified range.
-     * @param params A GetBlocksRequest object.
-     * @returns Promise<GetBlocksReply>
-     */
     async getBlocks(params: GetBlocksRequest): Promise<GetBlocksReply> {
         return this.send<GetBlocksReply>("ankr_getBlocks", params)
     }
 
-    /**
-     * Returns the Transaction(s) with specified hash among all supported blockchains.
-     * @param params A GetTransactionsByHashRequest object.
-     * @returns Promise<GetTransactionsByHashReply>
-     */
     async getTransactionsByHash(params: GetTransactionsByHashRequest): Promise<GetTransactionsByHashReply> {
         return this.send<GetTransactionsByHashReply>("ankr_getTransactionsByHash", params)
     }
 
-    /**
-     * Returns Transactions of specified address.
-     * @param params A GetTransactionsByAddressRequest object.
-     * @returns Promise<GetTransactionsByAddressReply>
-     */
     async getTransactionsByAddress(params: GetTransactionsByAddressRequest): Promise<GetTransactionsByAddressReply> {
         return this.send<GetTransactionsByAddressReply>("ankr_getTransactionsByAddress", params)
     }
 
-    /**
-     * Returns Transfers of specified address.
-     * @param params A GetTransfersRequest object.
-     * @returns Promise<GetTokenTransfersReply>
-     */
     async getTokenTransfers(params: GetTransfersRequest): Promise<GetTokenTransfersReply> {
         return this.send<GetTokenTransfersReply>("ankr_getTokenTransfers", params)
     }
 
-    /**
-     * Returns NFT Transfers of specified address.
-     * @param params A GetNftTransfersRequest object.
-     * @returns Promise<GetNftTransfersReply>
-     */
-    async getNftTransfers(params: GetTransfersRequest): Promise<GetNftTransfersReply> {
+    async getNftTransfers(params: GetNftTransfersRequest): Promise<GetNftTransfersReply> {
         return this.send<GetNftTransfersReply>("ankr_getNftTransfers", params)
     }
 
-    /**
-     * Returns coin and token balances of the wallet.
-     * @param params A GetAccountBalanceRequest object.
-     * @returns Promise<Balance[]>
-     */
     async getAccountBalance(params: GetAccountBalanceRequest): Promise<GetAccountBalanceReply> {
         return this.send<GetAccountBalanceReply>("ankr_getAccountBalance", params)
     }
 
-    /**
-     * Returns NFT collectibles of the wallet.
-     * @param params A GetNFTsByOwnerRequest object.
-     * @returns Promise<GetNFTsByOwnerReply>
-     */
     async getNFTsByOwner(params: GetNFTsByOwnerRequest): Promise<GetNFTsByOwnerReply> {
         return this.send<GetNFTsByOwnerReply>("ankr_getNFTsByOwner", params)
     }
@@ -130,7 +87,7 @@ export class AnkrProvider {
     /**
      * Returns NFT's contract metadata.
      * @param params A GetNFTMetadataRequest object.
-     * @returns Promise<GetNFTMetadataRequest>
+     * @returns Promise<GetNFTMetadataReply>
      */
     async getNFTMetadata(params: GetNFTMetadataRequest): Promise<GetNFTMetadataReply> {
         return await this.send<GetNFTMetadataReply>("ankr_getNFTMetadata", params)
@@ -139,85 +96,44 @@ export class AnkrProvider {
     /**
      * Returns NFT's holders.
      * @param params A GetNFTHoldersRequest object.
-     * @returns Promise<GetNFTHoldersRequest>
+     * @returns Promise<GetNFTHoldersReply>
      */
     async getNFTHolders(params: GetNFTHoldersRequest): Promise<GetNFTHoldersReply> {
         return await this.send<GetNFTHoldersReply>("ankr_getNFTHolders", params)
     }
 
-    /**
-     * Returns list of token holders.
-     * @param params A GetTokenHoldersRequest object.
-     * @returns Promise<GetTokenHoldersReply>
-     */
     async getTokenHolders(params: GetTokenHoldersRequest): Promise<GetTokenHoldersReply> {
         return this.send<GetTokenHoldersReply>("ankr_getTokenHolders", params)
     }
 
-    /**
-     * Returns list of historical token holders count by day.
-     * @param params A GetTokenHoldersCountRequest object.
-     * @returns Promise<GetTokenHoldersCountReply>
-     */
     async getTokenHoldersCount(params: GetTokenHoldersCountRequest): Promise<GetTokenHoldersCountReply> {
         return this.send<GetTokenHoldersCountReply>("ankr_getTokenHoldersCount", params)
     }
 
-    /**
-     * Returns token USD price.
-     * @param params A GetTokenPriceRequest object.
-     * @returns Promise<GetTokenPriceReply>
-     */
     async getTokenPrice(params: GetTokenPriceRequest): Promise<GetTokenPriceReply> {
         return this.send<GetTokenPriceReply>("ankr_getTokenPrice", params)
     }
 
-    /**
-     * Returns list of currencies.
-     * @param params A GetCurrenciesRequest object.
-     * @returns Promise<GetCurrenciesReply>
-     */
     async getCurrencies(params: GetCurrenciesRequest): Promise<GetCurrenciesReply> {
         return this.send<GetCurrenciesReply>("ankr_getCurrencies", params)
     }
 
-    /**
-     * Returns history of the token price.
-     * @param params A GetTokenPriceHistoryRequest object.
-     * @returns Promise<GetTokenPriceHistoryReply>
-     */
     async getTokenPriceHistory(params: GetTokenPriceHistoryRequest): Promise<GetTokenPriceHistoryReply> {
         return this.send<GetTokenPriceHistoryReply>("ankr_getTokenPriceHistory", params)
     }
 
-    /**
-     * Returns a list of tokens and the pool used for price calculation.
-     * @param params A ExplainTokenPriceRequest object.
-     * @returns Promise<ExplainTokenPriceReply>
-     */
     async explainTokenPrice(params: ExplainTokenPriceRequest): Promise<ExplainTokenPriceReply> {
         return this.send<ExplainTokenPriceReply>("ankr_explainTokenPrice", params)
     }
 
-    /**
-     * Returns blockchain stats (num of txs, etc.).
-     * @param params A GetBlockchainStatsRequest object.
-     * @returns Promise<GetBlockchainStatsReply>
-     */
     async getBlockchainStats(params: GetBlockchainStatsRequest): Promise<GetBlockchainStatsReply> {
         return this.send<GetBlockchainStatsReply>("ankr_getBlockchainStats", params)
     }
 
-    /**
-     * Returns on which chain address was interacting.
-     * @param params A GetInteractionsRequest object.
-     * @returns Promise<GetInteractionsReply>
-     */
     async getInteractions(params: GetInteractionsRequest): Promise<GetInteractionsReply> {
         return this.send<GetInteractionsReply>("ankr_getInteractions", params)
     }
 
-
     private async send<TReply>(method: string, params: any): Promise<TReply> {
         const request = {method, params, id: (this._nextId++), jsonrpc: "2.0"};
         const response = await axios.post<JsonRPCPayload>(this.url, JSON.stringify(request), this.requestConfig);