diff --git a/README.md b/README.md
index 405a5940..ec3d3f91 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,25 @@ const client2 = Binance({
 client.time().then(time => console.log(time))
 ```
 
+Can also use an RSA api key. You can create [here](https://www.binance.com/en/support/faq/how-to-generate-an-rsa-key-pair-to-send-api-requests-on-binance-2b79728f331e43079b27440d9d15c5db)
+
+```js
+import Binance from 'binance-api-node'
+
+const client = Binance()
+
+// Authenticated client, can make signed calls
+const client2 = Binance({
+  apiKey: 'xxx',
+  apiSecret: 'xxx',
+  getTime: xxx,
+  privateKey: 'path of .pem file',
+  privateKeyPassphrase: 'password .pem'
+})
+
+client.time().then(time => console.log(time))
+```
+
 If you do not have an appropriate babel config, you will need to use the basic commonjs requires.
 
 ```js
diff --git a/index.d.ts b/index.d.ts
index 65f7d8f7..1914b54e 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,6 +1,6 @@
 // tslint:disable:interface-name
 declare module 'binance-api-node' {
-  export default function(options?: {
+  export default function (options?: {
     apiKey?: string
     apiSecret?: string
     getTime?: () => number | Promise<number>
@@ -8,7 +8,9 @@ declare module 'binance-api-node' {
     httpFutures?: string
     wsBase?: string
     wsFutures?: string
-    proxy?: string
+    proxy?: string,
+    privateKey?: Buffer | string,
+    privateKeyPassphrase?: string
   }): Binance
 
   export type ErrorCodes_LT =
@@ -339,11 +341,11 @@ declare module 'binance-api-node' {
   export type CancelOrderOptions =
     | { symbol: string; orderId: number; useServerTime?: boolean; newClientOrderId?: string }
     | {
-        symbol: string
-        origClientOrderId: string
-        useServerTime?: boolean
-        newClientOrderId?: string
-      }
+      symbol: string
+      origClientOrderId: string
+      useServerTime?: boolean
+      newClientOrderId?: string
+    }
 
   export type GetOrderOcoOptions =
     | { orderListId: number; useServerTime?: boolean }
@@ -352,11 +354,11 @@ declare module 'binance-api-node' {
   export type CancelOrderOcoOptions =
     | { symbol: string; orderListId: number; useServerTime?: boolean; newClientOrderId?: string }
     | {
-        symbol: string
-        listClientOrderId: string
-        useServerTime?: boolean
-        newClientOrderId?: string
-      }
+      symbol: string
+      listClientOrderId: string
+      useServerTime?: boolean
+      newClientOrderId?: string
+    }
 
   export type cancelOpenOrdersOptions = {
     symbol: string
@@ -599,10 +601,10 @@ declare module 'binance-api-node' {
       recvWindow?: number
     }): Promise<DepositHistoryResponse>
     dustLog(options: {
-        startTime?: number
-        endTime?: number
-        recvWindow?: number
-        timestamp: number
+      startTime?: number
+      endTime?: number
+      recvWindow?: number
+      timestamp: number
     }): DustLog
     universalTransfer(options: UniversalTransfer): Promise<{ tranId: number }>
     universalTransferHistory(
@@ -1631,9 +1633,9 @@ declare module 'binance-api-node' {
     listClientOrderId: string
     transactionTime: number
     orders: Array<{
-        symbol: string
-        orderId: number
-        clientOrderId: string
+      symbol: string
+      orderId: number
+      clientOrderId: string
     }>
   }
 
diff --git a/package.json b/package.json
index bd595de9..b45453e8 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "binance-api-node",
-  "version": "0.12.4",
+  "version": "0.12.5-RC1",
   "description": "A node API wrapper for Binance",
   "main": "dist",
   "files": [
diff --git a/src/http-client.js b/src/http-client.js
index 7156d6a1..de21730c 100644
--- a/src/http-client.js
+++ b/src/http-client.js
@@ -20,12 +20,21 @@ const info = {
 /**
  * Build query string for uri encoded url based on json object
  */
-const makeQueryString = q =>
-  q
-    ? `?${Object.keys(q)
-        .map(k => `${encodeURIComponent(k)}=${encodeURIComponent(q[k])}`)
-        .join('&')}`
-    : ''
+const makeQueryString = params => {
+  if (!params) return ''
+  return Object.entries(params)
+    .map(stringifyKeyValuePair)
+    .join('&')
+}
+
+/**
+ * NOTE: The array conversion logic is different from usual query string.
+ * E.g. symbols=["BTCUSDT","BNBBTC"] instead of symbols[]=BTCUSDT&symbols[]=BNBBTC
+ */
+const stringifyKeyValuePair = ([key, value]) => {
+  const valueString = Array.isArray(value) ? `["${value.join('","')}"]` : value
+  return `${key}=${encodeURIComponent(valueString)}`
+}
 
 /**
  * Get API limits info from headers
@@ -47,8 +56,8 @@ const responseHandler = res => {
   const marketName = res.url.includes(FUTURES)
     ? 'futures'
     : res.url.includes(COIN_FUTURES)
-    ? 'delivery'
-    : 'spot'
+      ? 'delivery'
+      : 'spot'
 
   Object.keys(headersMapping).forEach(key => {
     const outKey = headersMapping[key]
@@ -122,13 +131,12 @@ const checkParams = (name, payload, requires = []) => {
 const publicCall = ({ proxy, endpoints }) => (path, data, method = 'GET', headers = {}) => {
   return sendResult(
     fetch(
-      `${
-        path.includes('/fapi') || path.includes('/futures')
-          ? endpoints.futures
-          : path.includes('/dapi')
+      `${path.includes('/fapi') || path.includes('/futures')
+        ? endpoints.futures
+        : path.includes('/dapi')
           ? endpoints.delivery
           : endpoints.base
-      }${path}${makeQueryString(data)}`,
+      }${path}?${makeQueryString(data)}`,
       {
         method,
         json: true,
@@ -173,8 +181,10 @@ const privateCall = ({
   endpoints,
   getTime = defaultGetTime,
   pubCall,
+  privateKey,
+  privateKeyPassphrase
 }) => (path, data = {}, method = 'GET', noData, noExtra) => {
-  if (!apiKey || !apiSecret) {
+  if ((!apiKey || !apiSecret) && (!apiKey || !privateKey || !privateKeyPassphrase)) {
     throw new Error('You need to pass an API key and secret to make authenticated calls.')
   }
 
@@ -186,22 +196,37 @@ const privateCall = ({
       delete data.useServerTime
     }
 
-    const signature = crypto
-      .createHmac('sha256', apiSecret)
-      .update(makeQueryString({ ...data, timestamp }).substr(1))
-      .digest('hex')
-
-    const newData = noExtra ? data : { ...data, timestamp, signature }
+    let signature;
+    let newData;
+    let queryString;
+    if (!privateKey) {
+      signature = crypto
+        .createHmac('sha256', apiSecret)
+        .update(makeQueryString({ ...data, timestamp }))
+        .digest('hex')
+      newData = noExtra ? data : { ...data, timestamp, signature }
+      queryString = makeQueryString(newData)
+    } else {
+      signature = crypto
+        .createSign('RSA-SHA256')
+        .update(makeQueryString({ ...data, timestamp }))
+        .sign({
+          key: privateKey,
+          passphrase: privateKeyPassphrase
+        }, 'base64')
+      signature = encodeURIComponent(signature)
+      newData = noExtra ? makeQueryString(data) : `${makeQueryString({ ...data, timestamp })}&signature=${signature}`;
+      queryString = newData;
+    }
 
     return sendResult(
       fetch(
-        `${
-          path.includes('/fapi') || path.includes('/futures')
-            ? endpoints.futures
-            : path.includes('/dapi')
+        `${path.includes('/fapi') || path.includes('/futures')
+          ? endpoints.futures
+          : path.includes('/dapi')
             ? endpoints.delivery
             : endpoints.base
-        }${path}${noData ? '' : makeQueryString(newData)}`,
+        }${path}${noData ? '' : `?${queryString}`} `,
         {
           method,
           headers: { 'X-MBX-APIKEY': apiKey },