Quick Start

REST API

using ccxt;

var exchange = new Binance();
await exchange.LoadMarkets();
var ticker = await exchange.FetchTicker("BTC/USDT");
Console.WriteLine(ticker);

WebSocket API - Real-time Updates

using ccxt.pro;

var exchange = new Binance();
while (true)
{
    var ticker = await exchange.WatchTicker("BTC/USDT");
    Console.WriteLine(ticker.Last);  // Live updates!
}
await exchange.Close();

REST vs WebSocket

Feature	REST API	WebSocket API
Use for	One-time queries, placing orders	Real-time monitoring, live price feeds
Import	`using ccxt;`	`using ccxt.pro;`
Methods	`Fetch*` (FetchTicker, FetchOrderBook)	`Watch*` (WatchTicker, WatchOrderBook)
Speed	Slower (HTTP request/response)	Faster (persistent connection)
Rate limits	Strict (1-2 req/sec)	More lenient (continuous stream)
Best for	Trading, account management	Price monitoring, arbitrage detection

Method naming: C# uses PascalCase - FetchTicker not fetchTicker, WatchTicker not watchTicker

Creating Exchange Instance

REST API

using ccxt;

// Public API (no authentication)
var exchange = new Binance
{
    EnableRateLimit = true  // Recommended!
};

// Private API (with authentication)
var exchange = new Binance
{
    ApiKey = "YOUR_API_KEY",
    Secret = "YOUR_SECRET",
    EnableRateLimit = true
};

WebSocket API

using ccxt.pro;

// Public WebSocket
var exchange = new Binance();

// Private WebSocket (with authentication)
var exchange = new Binance
{
    ApiKey = "YOUR_API_KEY",
    Secret = "YOUR_SECRET"
};

// Always close when done
await exchange.Close();

Common REST Operations

Loading Markets

// Load all available trading pairs
await exchange.LoadMarkets();

// Access market information
var btcMarket = exchange.Market("BTC/USDT");
Console.WriteLine(btcMarket.Limits.Amount.Min);  // Minimum order amount

Fetching Ticker

// Single ticker
var ticker = await exchange.FetchTicker("BTC/USDT");
Console.WriteLine(ticker.Last);      // Last price
Console.WriteLine(ticker.Bid);       // Best bid
Console.WriteLine(ticker.Ask);       // Best ask
Console.WriteLine(ticker.Volume);    // 24h volume

// Multiple tickers (if supported)
var tickers = await exchange.FetchTickers(new[] { "BTC/USDT", "ETH/USDT" });

Fetching Order Book

// Full orderbook
var orderbook = await exchange.FetchOrderBook("BTC/USDT");
Console.WriteLine(orderbook.Bids[0]);  // [price, amount]
Console.WriteLine(orderbook.Asks[0]);  // [price, amount]

// Limited depth
var orderbook = await exchange.FetchOrderBook("BTC/USDT", 5);  // Top 5 levels

Creating Orders

Limit Order

// Buy limit order
var order = await exchange.CreateLimitBuyOrder("BTC/USDT", 0.01, 50000);
Console.WriteLine(order.Id);

// Sell limit order
var order = await exchange.CreateLimitSellOrder("BTC/USDT", 0.01, 60000);

// Generic limit order
var order = await exchange.CreateOrder("BTC/USDT", "limit", "buy", 0.01, 50000);

Market Order

// Buy market order
var order = await exchange.CreateMarketBuyOrder("BTC/USDT", 0.01);

// Sell market order
var order = await exchange.CreateMarketSellOrder("BTC/USDT", 0.01);

// Generic market order
var order = await exchange.CreateOrder("BTC/USDT", "market", "sell", 0.01);

Fetching Balance

var balance = await exchange.FetchBalance();
Console.WriteLine(balance["BTC"].Free);   // Available balance
Console.WriteLine(balance["BTC"].Used);   // Balance in orders
Console.WriteLine(balance["BTC"].Total);  // Total balance

Fetching Orders

// Open orders
var openOrders = await exchange.FetchOpenOrders("BTC/USDT");

// Closed orders
var closedOrders = await exchange.FetchClosedOrders("BTC/USDT");

// All orders (open + closed)
var allOrders = await exchange.FetchOrders("BTC/USDT");

// Single order by ID
var order = await exchange.FetchOrder(orderId, "BTC/USDT");

Fetching Trades

// Recent public trades
var trades = await exchange.FetchTrades("BTC/USDT", limit: 10);

// Your trades (requires authentication)
var myTrades = await exchange.FetchMyTrades("BTC/USDT");

Canceling Orders

// Cancel single order
await exchange.CancelOrder(orderId, "BTC/USDT");

// Cancel all orders for a symbol
await exchange.CancelAllOrders("BTC/USDT");

WebSocket Operations (Real-time)

Watching Ticker (Live Price Updates)

using ccxt.pro;

var exchange = new Binance();
while (true)
{
    var ticker = await exchange.WatchTicker("BTC/USDT");
    Console.WriteLine($"Last: {ticker.Last}");
}
await exchange.Close();

Watching Order Book (Live Depth Updates)

var exchange = new Binance();
while (true)
{
    var orderbook = await exchange.WatchOrderBook("BTC/USDT");
    Console.WriteLine($"Best bid: {orderbook.Bids[0][0]}");
    Console.WriteLine($"Best ask: {orderbook.Asks[0][0]}");
}
await exchange.Close();

Watching Trades (Live Trade Stream)

var exchange = new Binance();
while (true)
{
    var trades = await exchange.WatchTrades("BTC/USDT");
    foreach (var trade in trades)
    {
        Console.WriteLine($"{trade.Price} {trade.Amount} {trade.Side}");
    }
}
await exchange.Close();

Watching Your Orders (Live Order Updates)

var exchange = new Binance
{
    ApiKey = "YOUR_API_KEY",
    Secret = "YOUR_SECRET"
};

while (true)
{
    var orders = await exchange.WatchOrders("BTC/USDT");
    foreach (var order in orders)
    {
        Console.WriteLine($"{order.Id} {order.Status} {order.Filled}");
    }
}
await exchange.Close();

Watching Balance (Live Balance Updates)

var exchange = new Binance
{
    ApiKey = "YOUR_API_KEY",
    Secret = "YOUR_SECRET"
};

while (true)
{
    var balance = await exchange.WatchBalance();
    Console.WriteLine($"BTC: {balance["BTC"].Total}");
}
await exchange.Close();

Watching Multiple Symbols

var exchange = new Binance();
var symbols = new[] { "BTC/USDT", "ETH/USDT", "SOL/USDT" };

while (true)
{
    var tickers = await exchange.WatchTickers(symbols);
    foreach (var kvp in tickers)
    {
        Console.WriteLine($"{kvp.Key}: {kvp.Value.Last}");
    }
}
await exchange.Close();

Complete Method Reference

Market Data Methods

Tickers & Prices

fetchTicker(symbol) - Fetch ticker for one symbol
fetchTickers([symbols]) - Fetch multiple tickers at once
fetchBidsAsks([symbols]) - Fetch best bid/ask for multiple symbols
fetchLastPrices([symbols]) - Fetch last prices
fetchMarkPrices([symbols]) - Fetch mark prices (derivatives)

Order Books

fetchOrderBook(symbol, limit) - Fetch order book
fetchOrderBooks([symbols]) - Fetch multiple order books
fetchL2OrderBook(symbol) - Fetch level 2 order book
fetchL3OrderBook(symbol) - Fetch level 3 order book (if supported)

Trades

fetchTrades(symbol, since, limit) - Fetch public trades
fetchMyTrades(symbol, since, limit) - Fetch your trades (auth required)
fetchOrderTrades(orderId, symbol) - Fetch trades for specific order

OHLCV (Candlesticks)

fetchOHLCV(symbol, timeframe, since, limit) - Fetch candlestick data
fetchIndexOHLCV(symbol, timeframe) - Fetch index price OHLCV
fetchMarkOHLCV(symbol, timeframe) - Fetch mark price OHLCV
fetchPremiumIndexOHLCV(symbol, timeframe) - Fetch premium index OHLCV

Account & Balance

fetchBalance() - Fetch account balance (auth required)
fetchAccounts() - Fetch sub-accounts
fetchLedger(code, since, limit) - Fetch ledger history
fetchLedgerEntry(id, code) - Fetch specific ledger entry
fetchTransactions(code, since, limit) - Fetch transactions
fetchDeposits(code, since, limit) - Fetch deposit history
fetchWithdrawals(code, since, limit) - Fetch withdrawal history
fetchDepositsWithdrawals(code, since, limit) - Fetch both deposits and withdrawals

Trading Methods

Creating Orders

createOrder(symbol, type, side, amount, price, params) - Create order (generic)
createLimitOrder(symbol, side, amount, price) - Create limit order
createMarketOrder(symbol, side, amount) - Create market order
createLimitBuyOrder(symbol, amount, price) - Buy limit order
createLimitSellOrder(symbol, amount, price) - Sell limit order
createMarketBuyOrder(symbol, amount) - Buy market order
createMarketSellOrder(symbol, amount) - Sell market order
createMarketBuyOrderWithCost(symbol, cost) - Buy with specific cost
createStopLimitOrder(symbol, side, amount, price, stopPrice) - Stop-limit order
createStopMarketOrder(symbol, side, amount, stopPrice) - Stop-market order
createStopLossOrder(symbol, side, amount, stopPrice) - Stop-loss order
createTakeProfitOrder(symbol, side, amount, takeProfitPrice) - Take-profit order
createTrailingAmountOrder(symbol, side, amount, trailingAmount) - Trailing stop
createTrailingPercentOrder(symbol, side, amount, trailingPercent) - Trailing stop %
createTriggerOrder(symbol, side, amount, triggerPrice) - Trigger order
createPostOnlyOrder(symbol, side, amount, price) - Post-only order
createReduceOnlyOrder(symbol, side, amount, price) - Reduce-only order
createOrders([orders]) - Create multiple orders at once
createOrderWithTakeProfitAndStopLoss(symbol, type, side, amount, price, tpPrice, slPrice) - OCO order

Managing Orders

fetchOrder(orderId, symbol) - Fetch single order
fetchOrders(symbol, since, limit) - Fetch all orders
fetchOpenOrders(symbol, since, limit) - Fetch open orders
fetchClosedOrders(symbol, since, limit) - Fetch closed orders
fetchCanceledOrders(symbol, since, limit) - Fetch canceled orders
fetchOpenOrder(orderId, symbol) - Fetch specific open order
fetchOrdersByStatus(status, symbol) - Fetch orders by status
cancelOrder(orderId, symbol) - Cancel single order
cancelOrders([orderIds], symbol) - Cancel multiple orders
cancelAllOrders(symbol) - Cancel all orders for symbol
editOrder(orderId, symbol, type, side, amount, price) - Modify order

Margin & Leverage

fetchBorrowRate(code) - Fetch borrow rate for margin
fetchBorrowRates([codes]) - Fetch multiple borrow rates
fetchBorrowRateHistory(code, since, limit) - Historical borrow rates
fetchCrossBorrowRate(code) - Cross margin borrow rate
fetchIsolatedBorrowRate(symbol, code) - Isolated margin borrow rate
borrowMargin(code, amount, symbol) - Borrow margin
repayMargin(code, amount, symbol) - Repay margin
fetchLeverage(symbol) - Fetch leverage
setLeverage(leverage, symbol) - Set leverage
fetchLeverageTiers(symbols) - Fetch leverage tiers
fetchMarketLeverageTiers(symbol) - Leverage tiers for market
setMarginMode(marginMode, symbol) - Set margin mode (cross/isolated)
fetchMarginMode(symbol) - Fetch margin mode

Derivatives & Futures

Positions

fetchPosition(symbol) - Fetch single position
fetchPositions([symbols]) - Fetch all positions
fetchPositionsForSymbol(symbol) - Fetch positions for symbol
fetchPositionHistory(symbol, since, limit) - Position history
fetchPositionsHistory(symbols, since, limit) - Multiple position history
fetchPositionMode(symbol) - Fetch position mode (one-way/hedge)
setPositionMode(hedged, symbol) - Set position mode
closePosition(symbol, side) - Close position
closeAllPositions() - Close all positions

Funding & Settlement

fetchFundingRate(symbol) - Current funding rate
fetchFundingRates([symbols]) - Multiple funding rates
fetchFundingRateHistory(symbol, since, limit) - Funding rate history
fetchFundingHistory(symbol, since, limit) - Your funding payments
fetchFundingInterval(symbol) - Funding interval
fetchSettlementHistory(symbol, since, limit) - Settlement history
fetchMySettlementHistory(symbol, since, limit) - Your settlement history

Open Interest & Liquidations

fetchOpenInterest(symbol) - Open interest for symbol
fetchOpenInterests([symbols]) - Multiple open interests
fetchOpenInterestHistory(symbol, timeframe, since, limit) - OI history
fetchLiquidations(symbol, since, limit) - Public liquidations
fetchMyLiquidations(symbol, since, limit) - Your liquidations

Options

fetchOption(symbol) - Fetch option info
fetchOptionChain(code) - Fetch option chain
fetchGreeks(symbol) - Fetch option greeks
fetchVolatilityHistory(code, since, limit) - Volatility history
fetchUnderlyingAssets() - Fetch underlying assets

Fees & Limits

fetchTradingFee(symbol) - Trading fee for symbol
fetchTradingFees([symbols]) - Trading fees for multiple symbols
fetchTradingLimits([symbols]) - Trading limits
fetchTransactionFee(code) - Transaction/withdrawal fee
fetchTransactionFees([codes]) - Multiple transaction fees
fetchDepositWithdrawFee(code) - Deposit/withdrawal fee
fetchDepositWithdrawFees([codes]) - Multiple deposit/withdraw fees

Deposits & Withdrawals

fetchDepositAddress(code, params) - Get deposit address
fetchDepositAddresses([codes]) - Multiple deposit addresses
fetchDepositAddressesByNetwork(code) - Addresses by network
createDepositAddress(code, params) - Create new deposit address
fetchDeposit(id, code) - Fetch single deposit
fetchWithdrawal(id, code) - Fetch single withdrawal
fetchWithdrawAddresses(code) - Fetch withdrawal addresses
fetchWithdrawalWhitelist(code) - Fetch whitelist
withdraw(code, amount, address, tag, params) - Withdraw funds
deposit(code, amount, params) - Deposit funds (if supported)

Transfer & Convert

transfer(code, amount, fromAccount, toAccount) - Internal transfer
fetchTransfer(id, code) - Fetch transfer info
fetchTransfers(code, since, limit) - Fetch transfer history
fetchConvertCurrencies() - Currencies available for convert
fetchConvertQuote(fromCode, toCode, amount) - Get conversion quote
createConvertTrade(fromCode, toCode, amount) - Execute conversion
fetchConvertTrade(id) - Fetch convert trade
fetchConvertTradeHistory(code, since, limit) - Convert history

Market Info

fetchMarkets() - Fetch all markets
fetchCurrencies() - Fetch all currencies
fetchTime() - Fetch exchange server time
fetchStatus() - Fetch exchange status
fetchBorrowInterest(code, symbol, since, limit) - Borrow interest paid
fetchLongShortRatio(symbol, timeframe, since, limit) - Long/short ratio
fetchLongShortRatioHistory(symbol, timeframe, since, limit) - L/S ratio history

WebSocket Methods (ccxt.pro)

All REST methods have WebSocket equivalents with watch* prefix:

Real-time Market Data

watchTicker(symbol) - Watch single ticker
watchTickers([symbols]) - Watch multiple tickers
watchOrderBook(symbol) - Watch order book updates
watchOrderBookForSymbols([symbols]) - Watch multiple order books
watchTrades(symbol) - Watch public trades
watchOHLCV(symbol, timeframe) - Watch candlestick updates
watchBidsAsks([symbols]) - Watch best bid/ask

Real-time Account Data (Auth Required)

watchBalance() - Watch balance updates
watchOrders(symbol) - Watch your order updates
watchMyTrades(symbol) - Watch your trade updates
watchPositions([symbols]) - Watch position updates
watchPositionsForSymbol(symbol) - Watch positions for symbol

Authentication Required

Methods marked with 🔒 require API credentials:

All create* methods (creating orders, addresses)
All cancel* methods (canceling orders)
All edit* methods (modifying orders)
All fetchMy* methods (your trades, orders)
fetchBalance, fetchLedger, fetchAccounts
withdraw, transfer, deposit
Margin/leverage methods
Position methods
watchBalance, watchOrders, watchMyTrades, watchPositions

Checking Method Availability

Not all exchanges support all methods. Check before using:

// Check if method is supported
if (exchange.has['fetchOHLCV']) {
    const candles = await exchange.fetchOHLCV('BTC/USDT', '1h')
}

// Check multiple capabilities
console.log(exchange.has)
// {
//   fetchTicker: true,
//   fetchOHLCV: true,
//   fetchMyTrades: true,
//   fetchPositions: false,
//   ...
// }

Method Naming Convention

fetch* - REST API methods (HTTP requests)
watch* - WebSocket methods (real-time streams)
create* - Create new resources (orders, addresses)
cancel* - Cancel existing resources
edit* - Modify existing resources
set* - Configure settings (leverage, margin mode)
*Ws suffix - WebSocket variant (some exchanges)

Proxy Configuration

CCXT supports HTTP, HTTPS, and SOCKS proxies for both REST and WebSocket connections.

Setting Proxy

// HTTP Proxy
exchange.httpProxy = 'http://your-proxy-host:port'

// HTTPS Proxy  
exchange.httpsProxy = 'https://your-proxy-host:port'

// SOCKS Proxy
exchange.socksProxy = 'socks://your-proxy-host:port'

// Proxy with authentication
exchange.httpProxy = 'http://user:pass@proxy-host:port'

Proxy for WebSocket

WebSocket connections also respect proxy settings:

exchange.httpsProxy = 'https://proxy:8080'
// WebSocket connections will use this proxy

Testing Proxy Connection

exchange.httpProxy = 'http://localhost:8080'
try {
    await exchange.fetchTicker('BTC/USDT')
    console.log('Proxy working!')
} catch (error) {
    console.error('Proxy connection failed:', error)
}

WebSocket-Specific Methods

Some exchanges provide WebSocket variants of REST methods for faster order placement and management. These use the *Ws suffix:

Trading via WebSocket

Creating Orders:

createOrderWs - Create order via WebSocket (faster than REST)
createLimitOrderWs - Create limit order via WebSocket
createMarketOrderWs - Create market order via WebSocket
createLimitBuyOrderWs - Buy limit order via WebSocket
createLimitSellOrderWs - Sell limit order via WebSocket
createMarketBuyOrderWs - Buy market order via WebSocket
createMarketSellOrderWs - Sell market order via WebSocket
createStopLimitOrderWs - Stop-limit order via WebSocket
createStopMarketOrderWs - Stop-market order via WebSocket
createStopLossOrderWs - Stop-loss order via WebSocket
createTakeProfitOrderWs - Take-profit order via WebSocket
createTrailingAmountOrderWs - Trailing stop via WebSocket
createTrailingPercentOrderWs - Trailing stop % via WebSocket
createPostOnlyOrderWs - Post-only order via WebSocket
createReduceOnlyOrderWs - Reduce-only order via WebSocket

Managing Orders:

editOrderWs - Edit order via WebSocket
cancelOrderWs - Cancel order via WebSocket (faster than REST)
cancelOrdersWs - Cancel multiple orders via WebSocket
cancelAllOrdersWs - Cancel all orders via WebSocket

Fetching Data:

fetchOrderWs - Fetch order via WebSocket
fetchOrdersWs - Fetch orders via WebSocket
fetchOpenOrdersWs - Fetch open orders via WebSocket
fetchClosedOrdersWs - Fetch closed orders via WebSocket
fetchMyTradesWs - Fetch your trades via WebSocket
fetchBalanceWs - Fetch balance via WebSocket
fetchPositionWs - Fetch position via WebSocket
fetchPositionsWs - Fetch positions via WebSocket
fetchPositionsForSymbolWs - Fetch positions for symbol via WebSocket
fetchTradingFeesWs - Fetch trading fees via WebSocket

When to Use WebSocket Methods

Use *Ws methods when:

You need faster order placement (lower latency)
You're already connected via WebSocket
You want to reduce REST API rate limit usage
Trading strategies require sub-100ms latency

Use REST methods when:

You need guaranteed execution confirmation
You're making one-off requests
The exchange doesn't support the WebSocket variant
You need detailed error responses

Example: Order Placement Comparison

REST API (slower, more reliable):

const order = await exchange.createOrder('BTC/USDT', 'limit', 'buy', 0.01, 50000)

WebSocket API (faster, lower latency):

const order = await exchange.createOrderWs('BTC/USDT', 'limit', 'buy', 0.01, 50000)

Checking WebSocket Method Availability

Not all exchanges support WebSocket trading methods:

if (exchange.has['createOrderWs']) {
    // Exchange supports WebSocket order creation
    const order = await exchange.createOrderWs('BTC/USDT', 'limit', 'buy', 0.01, 50000)
} else {
    // Fall back to REST
    const order = await exchange.createOrder('BTC/USDT', 'limit', 'buy', 0.01, 50000)
}

Authentication

Setting API Keys

using System;

// During instantiation (recommended)
var exchange = new Binance
{
    ApiKey = Environment.GetEnvironmentVariable("BINANCE_API_KEY"),
    Secret = Environment.GetEnvironmentVariable("BINANCE_SECRET"),
    EnableRateLimit = true
};

// After instantiation
exchange.ApiKey = Environment.GetEnvironmentVariable("BINANCE_API_KEY");
exchange.Secret = Environment.GetEnvironmentVariable("BINANCE_SECRET");

Testing Authentication

try
{
    var balance = await exchange.FetchBalance();
    Console.WriteLine("Authentication successful!");
}
catch (AuthenticationError)
{
    Console.WriteLine("Invalid API credentials");
}

Error Handling

Exception Hierarchy

BaseError
├─ NetworkError (recoverable - retry)
│  ├─ RequestTimeout
│  ├─ ExchangeNotAvailable
│  ├─ RateLimitExceeded
│  └─ DDoSProtection
└─ ExchangeError (non-recoverable - don't retry)
   ├─ AuthenticationError
   ├─ InsufficientFunds
   ├─ InvalidOrder
   └─ NotSupported

Basic Error Handling

using ccxt;

try
{
    var ticker = await exchange.FetchTicker("BTC/USDT");
}
catch (NetworkError ex)
{
    Console.WriteLine($"Network error - retry: {ex.Message}");
}
catch (ExchangeError ex)
{
    Console.WriteLine($"Exchange error - do not retry: {ex.Message}");
}
catch (Exception ex)
{
    Console.WriteLine($"Unknown error: {ex.Message}");
}

Specific Exception Handling

try
{
    var order = await exchange.CreateOrder("BTC/USDT", "limit", "buy", 0.01, 50000);
}
catch (InsufficientFunds)
{
    Console.WriteLine("Not enough balance");
}
catch (InvalidOrder)
{
    Console.WriteLine("Invalid order parameters");
}
catch (RateLimitExceeded)
{
    Console.WriteLine("Rate limit hit - wait before retrying");
    await Task.Delay(1000);  // Wait 1 second
}
catch (AuthenticationError)
{
    Console.WriteLine("Check your API credentials");
}

Retry Logic for Network Errors

async Task<Ticker> FetchWithRetry(int maxRetries = 3)
{
    for (int i = 0; i < maxRetries; i++)
    {
        try
        {
            return await exchange.FetchTicker("BTC/USDT");
        }
        catch (NetworkError)
        {
            if (i < maxRetries - 1)
            {
                Console.WriteLine($"Retry {i + 1}/{maxRetries}");
                await Task.Delay(1000 * (i + 1));  // Exponential backoff
            }
            else
            {
                throw;
            }
        }
    }
    return null;
}

Rate Limiting

Built-in Rate Limiter (Recommended)

var exchange = new Binance
{
    EnableRateLimit = true  // Automatically throttles requests
};

Manual Delays

await exchange.FetchTicker("BTC/USDT");
await Task.Delay((int)exchange.RateLimit);  // Wait between requests
await exchange.FetchTicker("ETH/USDT");

Checking Rate Limit

Console.WriteLine(exchange.RateLimit);  // Milliseconds between requests

Common Pitfalls

Wrong Method Casing

// Wrong - lowercase (JavaScript style)
var ticker = await exchange.fetchTicker("BTC/USDT");  // ERROR!

// Correct - PascalCase (C# style)
var ticker = await exchange.FetchTicker("BTC/USDT");

Not Awaiting Async Methods

// Wrong - missing await
var ticker = exchange.FetchTicker("BTC/USDT");  // Returns Task, not Ticker!
Console.WriteLine(ticker.Last);  // ERROR!

// Correct
var ticker = await exchange.FetchTicker("BTC/USDT");
Console.WriteLine(ticker.Last);  // Works!

Using REST for Real-time Monitoring

// Wrong - wastes rate limits
while (true)
{
    var ticker = await exchange.FetchTicker("BTC/USDT");  // REST
    Console.WriteLine(ticker.Last);
    await Task.Delay(1000);
}

// Correct - use WebSocket
using ccxt.pro;
var exchange = new Binance();
while (true)
{
    var ticker = await exchange.WatchTicker("BTC/USDT");  // WebSocket
    Console.WriteLine(ticker.Last);
}

Not Closing WebSocket Connections

// Wrong - memory leak
var exchange = new ccxt.pro.Binance();
var ticker = await exchange.WatchTicker("BTC/USDT");
// Forgot to close!

// Correct
var exchange = new ccxt.pro.Binance();
try
{
    while (true)
    {
        var ticker = await exchange.WatchTicker("BTC/USDT");
        Console.WriteLine(ticker.Last);
    }
}
finally
{
    await exchange.Close();
}

Incorrect Symbol Format

// Wrong symbol formats
"BTCUSDT"    // Wrong - no separator
"BTC-USDT"   // Wrong - dash separator
"btc/usdt"   // Wrong - lowercase

// Correct symbol format
"BTC/USDT"   // Unified CCXT format

Troubleshooting

Common Issues

1. "Package CCXT.NET not found"

Solution: Run dotnet add package CCXT.NET

2. "RateLimitExceeded"

Solution: Set EnableRateLimit = true

3. "AuthenticationError"

Solution: Check API key and secret
Verify API key permissions on exchange
Check system clock is synced

4. "InvalidNonce"

Solution: Sync system clock
Use only one exchange instance per API key

5. "InsufficientFunds"

Solution: Check available balance (balance["BTC"].Free)
Account for trading fees

6. "ExchangeNotAvailable"

Solution: Check exchange status/maintenance
Retry after a delay

Debugging

// Enable verbose logging
exchange.Verbose = true;

// Check exchange capabilities
Console.WriteLine(exchange.Has);
// {
//   FetchTicker = true,
//   FetchOrderBook = true,
//   CreateOrder = true,
//   ...
// }

// Check market information
var market = exchange.Markets["BTC/USDT"];

// Check last request/response
Console.WriteLine(exchange.LastHttpResponse);
Console.WriteLine(exchange.LastJsonResponse);

ccxt-csharp

CCXT for C#

Installation

Via NuGet Package Manager

Requirements