function cointracking($method, array $par = array()) {
	// API data
	$key = '123456789'; // YOUR API KEY
	$secret = 'abcdefghij'; // YOUR API SECRET

	$par['method'] = $method;
	$par['nonce'] = time();

	$post_data = http_build_query($par, '', '&');
	$sign = hash_hmac('sha512', $post_data, $secret);

	$headers = array(
		'Key: '.$key,
		'Sign: '.$sign
	);

	// curl
	static $ch = null;
	if (is_null($ch)) {
		$ch = curl_init();
		curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
		curl_setopt($ch, CURLOPT_USERAGENT, 'Mozilla/4.0 (compatible; CoinTracking PHP client; '.php_uname('s').'; PHP/'.phpversion().')');
	}
	curl_setopt($ch, CURLOPT_URL, 'https://cointracking.info/api/v1/');
	curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
	curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);
	curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
	$res = curl_exec($ch);

	if ($res === false) throw new Exception('API ERROR - No reply: '.curl_error($ch));
	$json = json_decode($res, true);
	if (!$json) throw new Exception('API ERROR - Invalid data received, please check connection and API data');
	return $json;
}
 
// Test request
$result = cointracking('getTrades', array('limit' => '200', 'order' => 'DESC', 'start' => 1300000000, 'end' => 1450000000));
print_r($result);

using System;
using System.Text;
using System.Security.Cryptography;
using System.Threading.Tasks;
using System.Collections;
using System.Collections.Generic;
using System.Net.Http;
using System.Linq;

namespace ct_api
{
    class CoinTrackingAPI
    {
        readonly string url = "https://cointracking.info/api/v1/";

        private readonly string apiKey;
        private readonly string apiSecret;

        static readonly HttpClient client = new HttpClient();

        public CoinTrackingAPI(string key, string secret)
        {
            apiKey = key;
            apiSecret = secret;
        }

        private FormUrlEncodedContent prepareRequestData(string method, IEnumerable<KeyValuePair<string, string>> data)
        {
            return new FormUrlEncodedContent(
                Enumerable.Concat(
                  data,
                  new[] {
                    new KeyValuePair<string, string>("method", method), 
                    new KeyValuePair<string, string>("nonce", new DateTimeOffset(DateTime.UtcNow).ToUnixTimeMilliseconds().ToString())
                  }
                )
            );
        }

        private async Task signMessage(FormUrlEncodedContent formData)
        {
            HMACSHA512 hmac = new HMACSHA512(Encoding.ASCII.GetBytes(apiSecret));
            byte[] sign = hmac.ComputeHash(await formData.ReadAsByteArrayAsync());

            formData.Headers.Add("Key", apiKey);
            formData.Headers.Add("Sign", BitConverter.ToString(sign).Replace("-", string.Empty).ToLower());
        }

        public async Task<string> getTrades(int limit = 0, string order = "ASC", int start = 0, int end = 0, bool tradePrices = false)
        {
            List<KeyValuePair<string, string>> optionalParams = new List<KeyValuePair<string, string>>();

            if (limit > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("limit", limit.ToString()));
            }

            optionalParams.Add(new KeyValuePair<string, string>("order", order));

            if (start > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("start", start.ToString()));
            }

            if (end > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("end", end.ToString()));
            }

            if (tradePrices) {
              optionalParams.Add(new KeyValuePair<string, string>("trade_prices", "1"));
            }

            FormUrlEncodedContent formData = prepareRequestData("getTrades", optionalParams);
            await signMessage(formData);

            HttpResponseMessage response = await client.PostAsync(url, formData);
            response.EnsureSuccessStatusCode();

            return await response.Content.ReadAsStringAsync();
        }

        public async Task<string> getBalance()
        {
            FormUrlEncodedContent formData = prepareRequestData("getBalance", new List<KeyValuePair<string, string>>());
            await signMessage(formData);

            HttpResponseMessage response = await client.PostAsync(url, formData);
            response.EnsureSuccessStatusCode();

            return await response.Content.ReadAsStringAsync();
        }

        public async Task<string> getHistoricalSummary(bool btc = false, int start = 0, int end = 0)
        {
            List<KeyValuePair<string, string>> optionalParams = new List<KeyValuePair<string, string>>();

            if (btc) {
              optionalParams.Add(new KeyValuePair<string, string>("btc", "1"));
            }

            if (start > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("start", start.ToString()));
            }

            if (end > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("end", end.ToString()));
            }

            FormUrlEncodedContent formData = prepareRequestData("getHistoricalSummary", optionalParams);
            await signMessage(formData);

            HttpResponseMessage response = await client.PostAsync(url, formData);
            response.EnsureSuccessStatusCode();

            return await response.Content.ReadAsStringAsync();
        }

        public async Task<string> getHistoricalCurrency(string currency = null, int start = 0, int end = 0)
        {
            List<KeyValuePair<string, string>> optionalParams = new List<KeyValuePair<string, string>>();

            if (!string.IsNullOrEmpty(currency)) {
              optionalParams.Add(new KeyValuePair<string, string>("currency", currency));
            }

            if (start > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("start", start.ToString()));
            }

            if (end > 0) {
              optionalParams.Add(new KeyValuePair<string, string>("end", end.ToString()));
            }

            FormUrlEncodedContent formData = prepareRequestData("getHistoricalCurrency", optionalParams);
            await signMessage(formData);

            HttpResponseMessage response = await client.PostAsync(url, formData);
            response.EnsureSuccessStatusCode();

            return await response.Content.ReadAsStringAsync();
        }

        public async Task<string> getGroupedBalance(string group = "exchange", bool excludeDepWith = false, string type = null)
        {
            List<KeyValuePair<string, string>> optionalParams = new List<KeyValuePair<string, string>>();

            if (!string.IsNullOrEmpty(group)) {
              optionalParams.Add(new KeyValuePair<string, string>("group", group));
            }

            if (!string.IsNullOrEmpty(type)) {
              optionalParams.Add(new KeyValuePair<string, string>("type", type));
            }

            if (excludeDepWith) {
              optionalParams.Add(new KeyValuePair<string, string>("exclude_dep_with", "1"));
            }

            FormUrlEncodedContent formData = prepareRequestData("getGroupedBalance", optionalParams);
            await signMessage(formData);

            HttpResponseMessage response = await client.PostAsync(url, formData);
            response.EnsureSuccessStatusCode();

            return await response.Content.ReadAsStringAsync();
        }

        public async Task<string> getGains(string price = null, bool btc = false)
        {
            List<KeyValuePair<string, string>> optionalParams = new List<KeyValuePair<string, string>>();

            if (!string.IsNullOrEmpty(price)) {
              optionalParams.Add(new KeyValuePair<string, string>("price", price));
            }

            if (btc) {
              optionalParams.Add(new KeyValuePair<string, string>("btc", "1"));
            }

            FormUrlEncodedContent formData = prepareRequestData("getGains", optionalParams);
            await signMessage(formData);

            HttpResponseMessage response = await client.PostAsync(url, formData);
            response.EnsureSuccessStatusCode();

            return await response.Content.ReadAsStringAsync();
        }
    }
}

using System;
using System.Threading.Tasks;

namespace ct_api
{
    class Program
    {
        static async Task Main(string[] args)
        {
            CoinTrackingAPI api = new CoinTrackingAPI("key", "secret");
            Console.WriteLine(await api.getTrades());
            Console.WriteLine(await api.getBalance());
            Console.WriteLine(await api.getHistoricalSummary());
            Console.WriteLine(await api.getHistoricalCurrency("BTC"));
            Console.WriteLine(await api.getGroupedBalance("type"));
            Console.WriteLine(await api.getGains("best"));
        }
    }
}

$result = cointracking('getTrades', array('limit' => '100', 'order' => 'ASC', 'start' => 1200000000, 'end' => 1450000000));

Array
(
	[success] => 1	
	[method] => getTrades
	[574025] => Array
		(
			[buy_amount] => 0.50000000
			[buy_currency] => BTC
			[sell_amount] => 900.20000000
			[sell_currency] => USD
			[fee_amount] => 4.50000000
			[fee_currency] => USD
			[type] => Trade
			[exchange] => Kraken
			[group] => 
			[comment] => This is a Kraken Trade
			[imported_from] => kraken
			[time] => 1320442867
			[imported_time] => 1391037169
			[trade_id] => 43250
		)

	[574024] => Array
		(
			[buy_amount] => 1
			[buy_currency] => BTC
			[sell_amount] => 
			[sell_currency] => 
			[fee_amount] => 
			[fee_currency] => 
			[type] => Deposit
			[exchange] => Bittrex
			[group] => My Bittrex Deposits
			[comment] => This is a Bittrex Deposit
			[imported_from] => job_bittrex
			[time] => 1320506675
			[imported_time] => 1391037169
			[trade_id] => fe9ois82msma91d821a
		)
	...
)

$result = cointracking('getTradesByUser', array('user' => 'user@email.com', 'limit' => '100', 'order' => 'ASC', 'start' => 1200000000, 'end' => 1450000000, 'trade_prices' => 0));

Array
(
	[success] => 1
	[method] => getTradesByUser
	[user] => user@email.com
	[trades] => Array
        (
            Array (
                [buy_amount] => 0.50000000
                [buy_currency] => BTC
                [sell_amount] => 900.20000000
                [sell_currency] => USD
                [fee_amount] => 4.50000000
                [fee_currency] => USD
                [type] => Trade
                [exchange] => Kraken
                [comment] => This is a Kraken Trade
                [imported_from] => kraken
                [time] => 1320442867
                [imported_time] => 1391037169
                [trade_id] => 43250
            ),
            Array (
                [buy_amount] => 1
                [buy_currency] => BTC
                [sell_amount] =>
                [sell_currency] =>
                [fee_amount] =>
                [fee_currency] =>
                [type] => Deposit
                [exchange] => Bittrex
                [comment] => This is a Bittrex Deposit
                [imported_from] => job_bittrex
                [time] => 1320506675
                [imported_time] => 1391037169
                [trade_id] => fe9ois82msma91d821a
            )
            ...
        )
)

$result = cointracking('getBalance');

Array
(
	[success] => 1
	[method] => getBalance
	[account_currency] => EUR
	[details] => Array
	(
		[BTC] => Array
			(
				[amount] => 1.18522859
				[coin] => BTC
				[value_fiat] => 3625.69722281
				[value_btc] => 1.18522859
				[price_fiat] => 3059.07000000
				[price_btc] => 1.00000000
				[change1h] => 0.29
				[change24h] => -0.61
				[change7d] => -0.34
				[change30d] => -14.60
			)

		[ETC] => Array
			(
				[amount] => 36.74842241
				[coin] => ETC
				[value_fiat] => 317.62015663
				[value_btc] => 0.10382899
				[price_fiat] => 8.64309638
				[price_btc] => 0.00282540
				[change1h] => 0.59
				[change24h] => 0.64
				[change7d] => -1.81
				[change30d] => -33.14
			)
		...	
	)
	
	[summary] => Array
	(
		[value_fiat] => 120114.45
		[value_btc] => 39.65021254
		[profit_fiat] => 107132.08
		[profit_btc] => 35.21109847
	)
)

$result = cointracking('getHistoricalSummary', array('btc' => '0', 'start' => 1200000000, 'end' => 1900000000));

Array
(
    [success] => 1
    [method] => getHistoricalSummary
    [display_currency] => USD
    [historical] => Array
        (
            [Coins] => Array
                (
                    [1506211200] => 300.15
                    [1506269572] => 305.95
                    ...
                )

            [Currencies] => Array
                (
                    [1506211200] => 109.50
                    [1506269572] => 107.25
                    ...
                )

            [Commodities] => Array
                (
                    [1506211200] => 0.00
                    [1506269572] => 0.00
                    ...
                )

            [Total] => Array
                (
                    [1506211200] => 409.65
                    [1506269572] => 413.20
                    ...
                )

        )

)

$result = cointracking('getHistoricalCurrency', array('currency' => 'ETH', 'start' => 1200000000, 'end' => 1900000000));

Array
(
    [success] => 1
    [method] => getHistoricalCurrency
    [account_currency] => USD
    [historical] => Array
        (
            [BTC] => Array
                (
                    [1497650400] => Array
                        (
                            [amount] => 0.50000000
                            [fiat] => 1500.00
                            [btc] => 0.50000000
                        )

                    [1497736800] => Array
                        (
                            [amount] => 0.50000000
                            [fiat] => 1520.12
                            [btc] => 0.50000000
                        )
                    ...
										
                )
            [ETH] => Array
                (
                    [1497650400] => Array
                        (
                            [amount] => 10.00000000
                            [fiat] => 3200.12
                            [btc] => 0.98000000
                        )

                    [1497736800] => Array
                        (
                            [amount] => 12.00000000
                            [fiat] => 3812.34
                            [btc] => 1.12345678
                        )
                    ...
										
                )
            ...
						
        )
)

$result = cointracking('getGroupedBalance', array('group' => 'exchange', 'exclude_dep_with' => '1', 'type' => 'Trade'));

Array
(
    [success] => 1
    [method] => getGroupedBalance
    [account_currency] => USD
    [details] => Array
        (
            [Kraken Balance] => Array
                (
                    [BTC] => Array
                        (
                            [amount] => 24.63757943
                            [fiat] => 82725.01
                            [btc] => 24.63757943
                        )

                    [LTC] => Array
                        (
                            [amount] => 499.95900000
                            [fiat] => 22152.36
                            [btc] => 6.65803900
                        )

                    [USD] => Array
                        (
                            [amount] => 40994.00000000
                            [fiat] => 40994.00
                            [btc] => 10.31441404
                        )

                    ...

                    [TOTAL_SUMMARY] => Array
                        (
                            [fiat] => 141288.18
                            [btc] => 42.51419671
                        )

                )
								
            [Bittrex Balance] => Array
                (
                    ...
                )
            [Coinbase Balance] => Array
                (
                    ...
                )

        )

)

$result = cointracking('getGains', array('tax_method' => 'FIFO', 'price' => 'best', 'btc' => '0'));

Array
(
    [success] => 1
    [method] => getGains
    [display_currency] => EUR
    [gains] => Array
        (
            [BTC] => Array
                (
                    [coin] => BTC
                    [amount] => 1.78089028
                    [cost_per_unit] => 2291.86172749
                    [current_price] => 3308.66
                    [change_percent] => 44.37
                    [cost] => 4081.55
                    [current_value] => 5892.36
                    [unrealized] => 1810.81
                    [realized] => 173072.97
                )

            [ETH] => Array
                (
                    [coin] => ETH
                    [amount] => 215.44959198
                    [cost_per_unit] => 97.38549511
                    [current_price] => 3308.66
                    [change_percent] => 3297.49
                    [cost] => 20981.67
                    [current_value] => 712849.45
                    [unrealized] => 691867.78
                    [realized] => 178638.97
                )
								
            ...
						
        )
)

$result = cointracking('getLedger');

$result = cointracking('getLedger', array('show_advanced' => '1', 'limit' => '100', 'start' => 1200000000, 'end' => 1450000000));

Array
(
    [success] => 1	
    [method] => getLedger
    [account_currency] => USD
    [62560] => Array
        (
            [ledger_count] => 1
            [id] => 62560
            [sub_id] => 0
            [type] => Airdrop
            [amount] => 0.20000000
            [currency] => LTC
            [value_at_transaction] => 5.00
            [price] => 25.00000000
            [exchange] => Electrum
            [trade_group] => Personal Wallet
            [trade_id] => 84b41cc21abf12234589012443de098
            [comment] => 
            [imported_from] => electrum
            [balance_before] => 0.00000000
            [value_before] => 0.00
            [balance_after] => 0.20000000
            [value_after] => 5.00
            [price_growth] => 
            [transaction_growth] => 
            [imported_time] => 1611415059
            [time] => 1496513959
        )

    [62561] => Array
        (
            [ledger_count] => 2
            [id] => 62561
            [sub_id] => 0
            [type] => Gift(Out)
            [amount] => 0.18000000
            [currency] => LTC
            [value_at_transaction] => 4.18
            [price] => 24.50912442
            [exchange] => Electrum
            [trade_group] => 
            [trade_id] => 95a658c2431b2c31a2ff44756412f121ac21
            [comment] => 
            [imported_from] => electrum
            [balance_before] => 0.20000000
            [value_before] => 5.25
            [balance_after] => 0.02000000
            [value_after] => 0.22
            [price_growth] => 5.00
            [transaction_growth] => -90.00
            [imported_time] => 1611415059
            [time] => 1496514179
        )

    [62561F] => Array
        (
            [ledger_count] => 2
            [id] => 62561
            [sub_id] => 3
            [type] => Fee
            [amount] => 0.00100000
            [currency] => LTC
            [value_at_transaction] => 
            [price] => 
            [exchange] => Electrum
            [trade_group] => 
            [trade_id] => 95a658c2431b2c31a2ff44756412f121ac21_fee
            [comment] => 
            [imported_from] => electrum
            [balance_before] => 
            [value_before] => 
            [balance_after] => 
            [value_after] => 
            [price_growth] => 
            [transaction_growth] => 
            [imported_time] => 1611415059
            [time] => 1496514179
        )
	...		
)