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Hello, I have been struggling with this for nearly 20 hours, and I just cannot seem to figure out the formatting for the header request. To test this, you will need to use this api key I set up for your testing purposes. (note, I sent tracexx a direct message about this as I didn't realize I could limit API restrictions until just now, so I am now hoping on of you may have the answer on hand) I need to be able to GET balance and POST orders. Right now, I can't get past the 401/403 errors on my own. I believe the Content is formatted for JSON, but using the JSON format didn't work for me ( although that may be because I'm an idiot and formatted something wrong). I want to get: GET balance page POST delete order page Here is a temporary API key + Secret API key with only the "View Balance Page" and "Delete Order" functions enabled: Access-key: tq6GeUrEvfxyF-LG Secret Access-Key: cZlz75K1wb8-Ed67pRaXvUWTPW6RTH9q Here is the site's API guide (I followed this closely and doubt the error is there): https://coincheck.com/documents/exchange/api#libraries And here is running source code (needs those keys inputted) which will hash the above keys to the required HMAC SHA256: #include <Crypt.au3> #include<WinHttp.au3> Global Const $CALG_SHA_256 = 0x0000800c ;; ===== $api = "/api/accounts/balance" $accessNonCE = _TimeGetStamp() $url = "https://coincheck.com/api/accounts/balance" $body = "" WinHTTP($url, $body) Func WinHTTP($sUrl, $sBody) Local $hOpen = _WinHttpOpen() Local $hConnect = _WinHttpConnect($hOpen, "https://coincheck.com/api/accounts/balance") ; Specify the reguest: ;Local $hRequest = _WinHttpOpenRequest($hConnect, Default, $sApi) $accessKey = "" ;; Add the key from above $secretKey = "" ;; Add the secret key from above $message = $accessNonCE & $sUrl $BinarySignature = HMAC($secretKey, $message) $signature = _Base64Encode($BinarySignature) ;Encode signature Local $hRequest = _WinHttpOpenRequest($hConnect, "GET") _WinHttpAddRequestHeaders($hRequest, 'ACCESS-KEY: '&$accessKey) _WinHttpAddRequestHeaders($hRequest, 'ACCESS-NONCE: '&$accessNonCE) _WinHttpAddRequestHeaders($hRequest, 'ACCESS-SIGNATURE: '&$signature) ; Send request _WinHttpSendRequest($hRequest) ; Wait for the response _WinHttpReceiveResponse($hRequest) Local $sHeader = _WinHttpQueryHeaders($hRequest) ; ...get full header Local $sData = _WinHttpReadData($hRequest) ; Clean _WinHttpCloseHandle($hRequest) _WinHttpCloseHandle($hConnect) _WinHttpCloseHandle($hOpen) ; Display retrieved data MsgBox(0, "Data", $sData) EndFunc Func sha256($message) Return _Crypt_HashData($message, $CALG_SHA_256) EndFunc Func HMAC($key, $message, $hash="sha256") Local $blocksize = 64 Local $a_opad[$blocksize], $a_ipad[$blocksize] Local Const $oconst = 0x5C, $iconst = 0x36 Local $opad = Binary(''), $ipad = Binary('') $key = Binary($key) If BinaryLen($key) > $blocksize Then $key = Call($hash, $key) For $i = 1 To BinaryLen($key) $a_ipad[$i-1] = Number(BinaryMid($key, $i, 1)) $a_opad[$i-1] = Number(BinaryMid($key, $i, 1)) Next For $i = 0 To $blocksize - 1 $a_opad[$i] = BitXOR($a_opad[$i], $oconst) $a_ipad[$i] = BitXOR($a_ipad[$i], $iconst) Next For $i = 0 To $blocksize - 1 $ipad &= Binary('0x' & Hex($a_ipad[$i],2)) $opad &= Binary('0x' & Hex($a_opad[$i],2)) Next Return Call($hash, $opad & Call($hash, $ipad & Binary($message))) EndFunc Func _TimeGetStamp() Local $av_Time $av_Time = DllCall('CrtDll.dll', 'long:cdecl', 'time', 'ptr', 0) If @error Then SetError(99) Return False EndIf Return $av_Time[0] EndFunc Func _Base64Encode($input) $input = Binary($input) Local $struct = DllStructCreate("byte[" & BinaryLen($input) & "]") DllStructSetData($struct, 1, $input) Local $strc = DllStructCreate("int") Local $a_Call = DllCall("Crypt32.dll", "int", "CryptBinaryToString", _ "ptr", DllStructGetPtr($struct), _ "int", DllStructGetSize($struct), _ "int", 1, _ "ptr", 0, _ "ptr", DllStructGetPtr($strc)) If @error Or Not $a_Call[0] Then Return SetError(1, 0, "") ; error calculating the length of the buffer needed EndIf Local $a = DllStructCreate("char[" & DllStructGetData($strc, 1) & "]") $a_Call = DllCall("Crypt32.dll", "int", "CryptBinaryToString", _ "ptr", DllStructGetPtr($struct), _ "int", DllStructGetSize($struct), _ "int", 1, _ "ptr", DllStructGetPtr($a), _ "ptr", DllStructGetPtr($strc)) If @error Or Not $a_Call[0] Then Return SetError(2, 0, ""); error encoding EndIf Return DllStructGetData($a, 1) EndFunc ;==>_Base64Encode