CCXT for C#

A comprehensive guide to using CCXT in C# and .NET projects for cryptocurrency exchange integration.

Installation

Via NuGet Package Manager

dotnet add package CCXT.NET

Or via Visual Studio:

1. Right-click project → Manage NuGet Packages
2. Search for "CCXT.NET"
3. Click Install

Requirements

• .NET Standard 2.0 or higher
• .NET Core 2.0+ / .NET 5+ / .NET Framework 4.6.1+

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);

Prediction Markets

CCXT supports prediction-market exchanges (Polymarket, Kalshi, Limitless, Myriad, Hyperliquid) under a dedicated ccxt.prediction namespace. They use the same unified API, but prices are quoted 0–1 (USDC per outcome share) and the tradeable unit is an outcome (e.g. a market's YES/NO token), not a regular market symbol.

using ccxt;

var exchange = new ccxt.prediction.polymarket();
await exchange.loadMarkets();
// discover events -> markets -> outcomes (each outcome has: outcome (handle),
// outcomeId, market, label); also fetchEvents / fetchEvent are available
var events = await exchange.fetchEvents(new Dictionary<string, object>() {{ "query", "Trump" }});
// an outcome handle looks like 'TRUMP_OUT_PRESIDENT_2027:YES'
string handle = "TRUMP_OUT_PRESIDENT_2027:YES";
var ticker = await exchange.fetchTicker(handle);
var book = await exchange.fetchOrderBook(handle);
// limit buy 5 YES shares @ 0.40 USDC (price is 0..1 per share)
var order = await exchange.createOrder(handle, "limit", "buy", 5, 0.40);
await exchange.cancelOrder(exchange.safeString(order, "id"), handle);

• Price/trade methods (fetchTicker, fetchOrderBook, fetchOHLCV, fetchTrades, createOrder, cancelOrder, …) take an outcome handle or outcomeId (the outcome / outcomes parameter), not symbol.
• Check support with exchange.has["prediction"]; discover markets via fetchEvents / fetchEvent (or loadMarkets).

Learn More

• CCXT Manual
• CCXT Pro Documentation
• Supported Exchanges
• GitHub Repository