Bitfinex.Net

Bitfinex.Net is a strongly typed client library for accessing the Bitfinex REST and Websocket API.

Features

• Response data is mapped to descriptive models
• Input parameters and response values are mapped to discriptive enum values where possible
• High performance
• Automatic websocket (re)connection management
• Client side order book implementation
• Support for managing different accounts
• Extensive logging
• Support for different environments
• Easy integration with other exchange client based on the CryptoExchange.Net base library
• Native AOT support

Documentation

The Bitfinex.Net documentation is the main resource for installing, configuring, and using the library.

Resource	Description
Client guide	Installation, REST and WebSocket clients, authentication, dependency injection, error handling, and advanced features
Examples	Common REST and WebSocket operations
API reference	Client interfaces, methods, and properties
Shared API guide	Common interfaces and models for working with multiple exchanges

Supported Frameworks

The library is targeting both .NET Standard 2.0 and .NET Standard 2.1 for optimal compatibility, as well as the latest dotnet versions to use the latest framework features.

.NET implementation	Version Support
.NET Core	2.0 and higher
.NET Framework	4.6.1 and higher
Mono	5.4 and higher
Xamarin.iOS	10.14 and higher
Xamarin.Android	8.0 and higher
UWP	10.0.16299 and higher
Unity	2018.1 and higher

Install the library

NuGet

dotnet add package Bitfinex.Net

GitHub packages

Bitfinex.Net is available on GitHub packages. You'll need to add https://nuget.pkg.github.com/JKorf/index.json as a NuGet package source.

Download release

The NuGet package files are added along side the source with the latest GitHub release which can found here.

How to use

Basic request:

// Get the ETH/USDT ticker via rest request
var restClient = new BitfinexRestClient();
var tickerResult = await restClient.ExchangeApi.ExchangeData.GetTickerAsync("tETHUST");
var lastPrice = tickerResult.Data.LastPrice;

Place order:

var restClient = new BitfinexRestClient(opts => {
	opts.ApiCredentials = new BitfinexCredentials("APIKEY", "APISECRET");
});

// Place Limit order for 0.1 ETH at 2000
var orderResult = await restClient.ExchangeApi.Trading.PlaceOrderAsync(
    "tETHUST",
    OrderSide.Buy,
    OrderType.ExchangeLimit,
    0.1m,
    2000);

WebSocket subscription:

// Subscribe to ETH/USDT ticker updates via the websocket API
var socketClient = new BitfinexSocketClient();
var tickerSubscriptionResult = socketClient.ExchangeApi.SubscribeToTickerUpdatesAsync("tETHUST", (update) => 
{
  var lastPrice = update.Data.LastPrice;
});

For more examples and explanations, continue with the Bitfinex.Net documentation or browse the compilable repository examples.

Shared / unified API

The CryptoExchange.Net Shared APIs provide exchange-agnostic, unified interfaces for common operations such as retrieving tickers, order books and balances, placing orders, and subscribing to market updates.

This allows the same application code to work with different exchange libraries. The supported Bitfinex API surfaces expose their shared functionality through a SharedClient property. Because support differs between exchanges and API surfaces, call Discover() to inspect the available trading modes, environments, endpoints, and subscriptions at runtime.

Supported shared interfaces

API	Type	Supported interfaces
ExchangeApi	REST	IAssetsRestClient, IBalanceRestClient, IBookTickerRestClient, IDepositRestClient, IFeeRestClient, IFuturesOrderRestClient, IFuturesSymbolRestClient, IFuturesTickerRestClient, IKlineRestClient, IOrderBookRestClient, IRecentTradeRestClient, ISpotOrderRestClient, ISpotSymbolRestClient, ISpotTickerRestClient, ISpotTriggerOrderRestClient, ITradeHistoryRestClient, ITransferRestClient, IWithdrawalRestClient, IWithdrawRestClient
ExchangeApi	WebSocket	IBalanceSocketClient, IBookTickerSocketClient, IFuturesOrderSocketClient, IKlineSocketClient, IPositionSocketClient, ISpotOrderSocketClient, ITickerSocketClient, ITradeSocketClient, IUserTradeSocketClient

Discover supported functionality

var sharedClient = new BitfinexRestClient().ExchangeApi.SharedClient;
var clientInfo = sharedClient.Discover();

Console.WriteLine(clientInfo);

Example

using Bitfinex.Net.Clients;
using CryptoExchange.Net.SharedApis;

var sharedClient = new BitfinexRestClient().ExchangeApi.SharedClient;
ISpotTickerRestClient tickerClient = sharedClient;

var symbol = new SharedSymbol(TradingMode.Spot, "BTC", "USD");
var result = await tickerClient.GetSpotTickerAsync(
    new GetTickerRequest(symbol));

if (!result.Success)
{
    Console.WriteLine(result.Error);
    return;
}

Console.WriteLine(result.Data.LastPrice);

The request and response models belong to CryptoExchange.Net.SharedApis, so the same pattern can be used with another exchange's SharedClient.

AI documentation

For AI coding assistants and quick onboarding:

• AGENTS.md skill-style instructions for Bitfinex.Net usage
• llms.txt provides concise AI context
• llms-full.txt provides detailed patterns, pitfalls and endpoint routing
• docs/ai-api-map.md maps common intents to client members
• Examples/ai-friendly contains compact examples that are compiled by the test suite

See cryptoexchange-skills-hub for installable skills.

CryptoExchange.Net

Bitfinex.Net is based on the CryptoExchange.Net base library. Other exchange API implementations based on the CryptoExchange.Net base library are available and follow the same logic.

CryptoExchange.Net also provides shared access to different exchange APIs.

Exchange	Repository	Nuget
Aster	JKorf/Aster.Net
Binance	JKorf/Binance.Net
BingX	JKorf/BingX.Net
Bitget	JKorf/Bitget.Net
BitMart	JKorf/BitMart.Net
BitMEX	JKorf/BitMEX.Net
Bitstamp	JKorf/Bitstamp.Net
BloFin	JKorf/BloFin.Net
Bybit	JKorf/Bybit.Net
Coinbase	JKorf/Coinbase.Net
CoinEx	JKorf/CoinEx.Net
CoinGecko	JKorf/CoinGecko.Net
CoinW	JKorf/CoinW.Net
Crypto.com	JKorf/CryptoCom.Net
DeepCoin	JKorf/DeepCoin.Net
Gate.io	JKorf/GateIo.Net
HTX	JKorf/HTX.Net
HyperLiquid	JKorf/HyperLiquid.Net
Kraken	JKorf/Kraken.Net
Kucoin	JKorf/Kucoin.Net
LBank	JKorf/LBank.Net
Lighter	JKorf/Lighter.Net
Mexc	JKorf/Mexc.Net
OKX	JKorf/OKX.Net
Pionex	JKorf/Pionex.Net
Polymarket	JKorf/Polymarket.Net
Toobit	JKorf/Toobit.Net
Upbit	JKorf/Upbit.Net
Weex	JKorf/Weex.Net
WhiteBit	JKorf/WhiteBit.Net
XT	JKorf/XT.Net

Discord

A Discord server is available here. Feel free to join for discussion and/or questions around the CryptoExchange.Net and implementation libraries.

Supported functionality

API	Supported	Location
Rest Public Endpoints	✓	restClient.ExchangeApi.ExchangeData
Rest Public Pulse Endpoints	X
Calculation Endpoints	✓	restClient.ExchangeApi.ExchangeData
Rest Authenticated Endpoints	✓	restClient.ExchangeApi.Account / restClient.ExchangeApi.Trading
Rest Authenticated Pulse Endpoints	X
Rest Authenticated Merchant Endpoints	X
Websocket Public Channels	✓	socketClient.ExchangeApi
Websocket Authenticated Channels	✓	socketClient.ExchangeApi
Websocket Authenticated Inputs	✓	socketClient.ExchangeApi

Support the project

Any support is greatly appreciated.

Donate

Make a one time donation in a crypto currency of your choice. If you prefer to donate in a different currency or network send me a message.

USDT (TRX) TKigKeJPXZYyMVDgMyXxMf17MWYia92Rjd

Sponsor

Alternatively, sponsor me on Github using Github Sponsors.

Release notes

• Version 11.4.0 - 21 Aug 2026

  • Updated to CryptoExchange.Net v12.5.0
  • Added CancellationToken parameter to socket queries
  • Added Shared ISpotOrderManagementSocketClient, IFuturesOrderManagementSocketClient implementations

• Version 11.3.1 - 12 Aug 2026

  • Fixed sequence number read for unhandled messages on the authenticated channel

• Version 11.3.0 - 29 Jul 2026

  • Updated CryptoExchange.Net to version 12.4.0
  • Added calculation of AveragePrice on Shared order models if data is available and AveragePrice is not set
  • Added DebuggerDisplay attributes to Result models
  • Added AveragePrice property to SharedQuantity model
  • Updated SharedFuturesTicker, SharedSpotTicker, SharedTrade and SharedKline to use SharedOrderQuantity for volumes/quantities

• Version 11.2.0 - 21 Jul 2026

  • Updated CryptoExchange.Net to v12.2.0
  • Added SpotSymbolCatalog to Shared ISpotSymbolRestClient interface
  • Added FuturesSymbolCatalog to Shared IFuturesSymbolRestClient interface
  • Added BaseAssetType, BaseAssetSubType, QuoteAssetType and QuoteAssetSubType to GetSymbolsRequest model
  • Added DisplayName to SharedSpotSymbol and SharedFuturesSymbol models
  • Added BaseAssetType, BaseAssetSubType, QuoteAssetType and QuoteAssetSubType to SharedSpotSymbol and SharedFuturesSymbol models
  • Added DebuggerDisplay attributes to Shared models

• Version 11.1.1 - 13 Jul 2026

  • Fixed exception during authentication when retrying requests

• Version 11.1.0 - 09 Jul 2026

  • Updated CryptoExchange.Net to v12.1.0

• Version 11.0.0 - 29 Jun 2026

  • Updated API topic name from SpotApi to ExchangeApi
  • Result types:
    • (Web)CallResult types are replaced by HttpResult, WebSocketResult and QueryResult with the same logic
    • WebSocketResult and QueryResult now return additional info for websocket operations
    • Updated result types to record type
    • Removed implicit result type conversion to bool, if (result) no longer works, instead use if (result.Success)
    • Fixed result object nullability hinting, for example Data might be null if Success isn't checked for true
  • Clients:
    • Added ToString overrides on base API types
    • Added Exchange property on BaseApiClient
    • Added ApiCredentials property on Api clients
    • Updated ILogger source from client name to topic specific client name
    • Removed logging from client creation
    • Fixed issue in SocketApiClient.GetSocketConnection causing requests to always wait the full max 10 seconds when there was a reconnecting socket
  • Shared APIs:
    • Added IFuturesOrderRestClient and IFuturesTickerRestClient to REST shared implementations
    • Added IPositionSocketClient, IFuturesOrderSocketClient to Socket shared implementations
    • Added missing dedicated option types
    • Added Discover method on ISharedClient interface, returning info on supported capabilities and operations
    • Added ResetStaticExchangeParameters method on ExchangeParameters
    • Added Status property to SharedWithdrawal model
    • Added TradingModes property to SharedBalance model
    • Updated Shared logic to correctly filter between Spot and Futures data
    • Updated Shared ExchangeParameters parameter names to be case insensitive
    • Updated code comments
    • Replaced ExchangeResult with ExchangeCallResult type
    • Removed TradingMode from the response model, only maintained on models where it makes sense
    • Removed IListenKey support, listen keys now rely on internal management
  • Added restClient.ExchangeApi.Account.GetSymbolMarginInfoSymbolsAsync endpoint
  • Added MarginRequired property to BitfinexMarginBaseInfo model
  • Added travel rule parameters to WithdrawV2Async
  • Added async streaming on UserDataTracker items with StreamUpdatesAsync
  • Added cancellation token support to UserDataTracker starting
  • Added SupportedEnvironments property to PlatformInfo
  • Added Clear() method on UserClientProvider to clear all cached clients
  • Added setter to BitfinexExchange.RateLimiter to allow custom rate limit settings
  • Various small performance improvements
  • Fixed websocket connection attempts counting towards rate limit even when server could not be reached
  • Fixed Futures order update ClientOrderId deserialization
  • Fixed code comments documentation references
  • Fixed restClient.ExchangeApi.ExchangeData.GetDerivativesStatusHistoryAsync deserialization