diff --git a/Sources/ThresholdKey/RssComm.swift b/Sources/ThresholdKey/RssComm.swift
index 52bb2b2..36dfa99 100644
--- a/Sources/ThresholdKey/RssComm.swift
+++ b/Sources/ThresholdKey/RssComm.swift
@@ -20,16 +20,18 @@ public final class RssComm {
             .replacingOccurrences(of: " ", with: "+")
             .replacingOccurrences(of: " ", with: "+", options: [], range: nil)
     }
-
     public init() throws {
         var errorCode: Int32 = -1
 
         let network_interface: (@convention(c) (UnsafeMutablePointer<CChar>?, UnsafeMutablePointer<CChar>?, UnsafeMutableRawPointer?, UnsafeMutablePointer<Int32>?) -> UnsafeMutablePointer<CChar>?)? = { url, data, _, error_code in
             let sem = DispatchSemaphore(value: 0)
-            let urlString = String(cString: url!)
+            var urlString = String(cString: url!)
             let dataString = String(cString: data!)
             string_free(url)
             string_free(data)
+            if urlString.split(separator: "/").last == "rss_round_2" {
+                urlString.append("_stream") // use multipart-form api instead
+            }
             let url = URL(string: urlString)!
             let session = URLSession.shared
             var request = URLRequest(url: url)
@@ -37,28 +39,111 @@ public final class RssComm {
             request.addValue("*", forHTTPHeaderField: "Access-Control-Allow-Origin")
             request.addValue("GET, POST", forHTTPHeaderField: "Access-Control-Allow-Methods")
             request.addValue("Content-Type", forHTTPHeaderField: "Access-Control-Allow-Headers")
-            request.addValue("application/json", forHTTPHeaderField: "Content-Type")
-
-            request.httpBody = dataString.data(using: String.Encoding.utf8)
-            var resultPointer = UnsafeMutablePointer<CChar>(nil)
-            var result = NSString()
-            session.dataTask(with: request) { data, _, error in
-                defer {
-                    sem.signal()
+            if urlString.split(separator: "/").last == "rss_round_1" {
+                request.addValue("application/json", forHTTPHeaderField: "Content-Type")
+                request.httpBody = dataString.data(using: String.Encoding.utf8)
+                var resultPointer = UnsafeMutablePointer<CChar>(nil)
+                var result = NSString()
+                session.dataTask(with: request) { data, _, error in
+                    defer {
+                        sem.signal()
+                    }
+                    if error != nil {
+                        let code: Int32 = 1
+                        error_code?.pointee = code
+                    }
+                    if let data = data {
+                        let resultString: String = String(decoding: data, as: UTF8.self)
+                        result = NSString(string: resultString)
+                    }
+                }.resume()
+                
+                sem.wait()
+                resultPointer = UnsafeMutablePointer<CChar>(mutating: result.utf8String)
+                return resultPointer
+            } else {
+                let json = try! JSONSerialization.jsonObject(with: dataString.data(using: String.Encoding.utf8)!, options: .allowFragments) as! [String: Any]
+                
+                let boundary = "Boundary-\(UUID().uuidString)"
+                var request = URLRequest(url: url)
+                request.httpMethod = "POST"
+                request.setValue("multipart/form-data; boundary=\(boundary)", forHTTPHeaderField: "Content-Type")
+                
+                var body = Data()
+                
+                func appendField(name: String, value: Any) {
+                    body.append("--\(boundary)\r\n".data(using: .utf8)!)
+                    body.append("Content-Disposition: form-data; name=\"\(name)\"\r\n\r\n".data(using: .utf8)!)
+                    body.append("\(value)\r\n".data(using: .utf8)!)
                 }
-                if error != nil {
-                    let code: Int32 = 1
-                    error_code?.pointee = code
+                
+                func appendJSONField(name: String, json: Any) {
+                    if let jsonData = try? JSONSerialization.data(withJSONObject: json, options: []),
+                       let jsonString = String(data: jsonData, encoding: .utf8) {
+                        body.append("--\(boundary)\r\n".data(using: .utf8)!)
+                        body.append("Content-Disposition: form-data; name=\"\(name)\"\r\n".data(using: .utf8)!)
+                        body.append("Content-Type: application/json\r\n\r\n".data(using: .utf8)!)
+                        body.append("\(jsonString)\r\n".data(using: .utf8)!)
+                    }
                 }
-                if let data = data {
-                    let resultString: String = String(decoding: data, as: UTF8.self)
-                    result = NSString(string: resultString)
+                
+                if let roundName = json["round_name"] as? String {
+                    appendField(name: "round_name", value: roundName)
                 }
-            }.resume()
-
-            sem.wait()
-            resultPointer = UnsafeMutablePointer<CChar>(mutating: result.utf8String)
-            return resultPointer
+                if let serverIndex = json["server_index"] as? Int {
+                    appendField(name: "server_index", value: serverIndex)
+                }
+                if let targetIndex = json["target_index"] as? [Int] {
+                    appendField(name: "target_index", value: targetIndex.map { "\($0)" }.joined(separator: ","))
+                }
+                
+                if let data = json["data"] as? [[String: Any]] {
+                    for (index, dataItem) in data.enumerated() {
+                        if let masterCommits = dataItem["master_commits"] as? [[String: Any]] {
+                            for (idx, subDataItem) in masterCommits.enumerated() {
+                                appendJSONField(name: "data[\(index)][master_commits[\(idx)]]", json: subDataItem)
+                            }
+                        }
+                        if let serverCommits = dataItem["server_commits"] as? [[String: Any]] {
+                            for (idx, subDataItem) in serverCommits.enumerated() {
+                                appendJSONField(name: "data[\(index)][server_commits[\(idx)]]", json: subDataItem)
+                            }
+                        }
+                        if let serverEncs = dataItem["server_encs"] as? [[String: Any]] {
+                            for (idx, subDataItem) in serverEncs.enumerated() {
+                                appendJSONField(name: "data[\(index)][server_encs[\(idx)]]", json: subDataItem)
+                            }
+                        }
+                        if let factorPubkeys = dataItem["factor_pubkeys"] as? [[String: Any]] {
+                            for (idx, subDataItem) in factorPubkeys.enumerated() {
+                                appendJSONField(name: "data[\(index)][factor_pubkeys[\(idx)]]", json: subDataItem)
+                            }
+                        }
+                    }
+                }
+                
+                body.append("--\(boundary)--\r\n".data(using: .utf8)!)
+                request.httpBody = body
+                var resultPointer = UnsafeMutablePointer<CChar>(nil)
+                var result = NSString()
+                session.dataTask(with: request) { data, _, error in
+                    defer {
+                        sem.signal()
+                    }
+                    if error != nil {
+                        let code: Int32 = 1
+                        error_code?.pointee = code
+                    }
+                    if let data = data {
+                        let resultString: String = String(decoding: data, as: UTF8.self)
+                        result = NSString(string: resultString)
+                    }
+                }.resume()
+                
+                sem.wait()
+                resultPointer = UnsafeMutablePointer<CChar>(mutating: result.utf8String)
+                return resultPointer
+            }
         }
 
         let result = withUnsafeMutablePointer(to: &errorCode, { error in
diff --git a/tkey-mpc-swift.podspec b/tkey-mpc-swift.podspec
index 67f15c9..53ab69d 100644
--- a/tkey-mpc-swift.podspec
+++ b/tkey-mpc-swift.podspec
@@ -1,6 +1,6 @@
 Pod::Spec.new do |spec|
   spec.name         = "tkey-mpc-swift"
-  spec.version      = "4.0.1"
+  spec.version      = "4.0.2"
   spec.platform = :ios, "14.0"
   spec.summary      = "SDK allows you to create threshold key setup natively with multiparty computation support"
   spec.homepage     = "https://web3auth.io/"