Aster.Net is a client library for accessing the Aster DEX REST and Websocket API.

• 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 rate limiting
• Client side order book implementation
• Support for managing different accounts
• Extensive logging
• Support for different environments
• Easy integration with other exchange clients based on the CryptoExchange.Net base library
• Native AOT support

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.

dotnet add package JKorf.Aster.Net

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

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

Basic request:

// Get the ETH/USDT ticker via rest request
var restClient = new AsterRestClient();
var tickerResult = await restClient.SpotApiV3.ExchangeData.GetTickerAsync("ETHUSDT");
var lastPrice = tickerResult.Data.LastPrice;	

Place order:

var restClient = new AsterRestClient(opts => {
	opts.ApiCredentials = new AsterV3Credential("PRIVATEKEY", "SIGNERPRIVATEKEY");
});

// Place Limit order to go long for 0.1 ETH at 2000
var orderResult = await asterRestClient.FuturesV3Api.Trading.PlaceOrderAsync(
	"ETHUSDT",
	OrderSide.Buy,
	OrderType.Limit,
	0.1m,
	2000,
	positionSide: PositionSide.Long);

WebSocket subscription:

// Subscribe to ETH/USDT ticker updates via the websocket API
var socketClient = new AsterSocketClient();
var tickerSubscriptionResult = socketClient.SpotApiV3.SubscribeToTickerUpdatesAsync("ETHUSDT", (update) => 
{
  var lastPrice = update.Data.LastPrice;
});

For information on the clients, dependency injection, response processing and more see the documentation, or have a look at the examples here or here.

NOTE
Aster.Net uses the Builder Code mechanism for Aster when using the V3 API, which means that an additional 1bps / 0.01% fee is charged on top of orders placed with the library to fund development. This is entirely optional and can be disabled in the client options by setting BuilderFeePercentage to 0 or null in the client options.

Depending on the API used different credentials types are required.
V3 | SpotV3Api / FuturesV3Api
The V3 API is recommended, API credentials can be provided via the AsterV3Credential overload available on the AsterCredentials object.
There are 2 ways to provide credentials for the V3 API:

1. Use the private key of your wallet connected to Aster and the private signer key, which can be obtained via the Aster UI under [Api Management] => [Pro Api]
   This gives access to all endpoints.

var credentials = new AsterCredentials(new AsterV3Credential("PRIVATEKEY", "SIGNERPRIVATEKEY"));
var client = new AsterRestClient(opts => { opts.ApiCredentials = credentials; });
var result = await client.FuturesV3Api.Account.GetBalancesAsync();

2. Use the public address of your wallet connected to Aster and the public and private signer key which can be obtained via the Aster UI under [Api Management] => [Pro Api]
   This gives access to most but not all endpoints.

var credentials = new AsterCredentials(new AsterV3Credential("PUBLICADDRESS", "SIGNERPUBLICKEY", "SIGNERPRIVATEKEY"));
var client = new AsterRestClient(opts => { opts.ApiCredentials = credentials; });
var result = await client.FuturesV3Api.Account.GetBalancesAsync();

V1 | SpotApi / FuturesApi
The V1 API only requires the credentials which can be obtained via the Aster UI under [Api Management] => [Api]

var credentials = new AsterCredentials(new HMACCredential("APIKEY", "APISECRET"));
var client = new AsterRestClient(opts => { opts.ApiCredentials = credentials; });
var result = await client.FuturesApi.Account.GetBalancesAsync();

Aster.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 allows for easy access to different exchange API's.

Exchange	Repository	Nuget
Binance	JKorf/Binance.Net
BingX	JKorf/BingX.Net
Bitfinex	JKorf/Bitfinex.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
Mexc	JKorf/Mexc.Net
OKX	JKorf/OKX.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

When using multiple of these API's the CryptoClients.Net package can be used which combines this and the other packages and allows easy access to all exchange API's.

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

Any support is greatly appreciated.

Make a one time donation in a crypto currency of your choice. If you prefer to donate a currency not listed here please contact me.

Btc: bc1q277a5n54s2l2mzlu778ef7lpkwhjhyvghuv8qf
Eth: 0xcb1b63aCF9fef2755eBf4a0506250074496Ad5b7
USDT (TRX) TKigKeJPXZYyMVDgMyXxMf17MWYia92Rjd

Alternatively, sponsor me on Github using Github Sponsors.

• Version 3.2.0 - 12 Apr 2026

  • Added Agent endpoints
  • Added AsterV3Credentials overload for using public address
  • Added additional checks for builder parameters
  • Fix for REST error message parsing
  • Removed BuilderName option and parameter from ApproveBuilderAsync endpoint

• Version 3.1.0 - 09 Apr 2026

  • Updated CryptoExchange.Net to version 11.1.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Updated restClient.FuturesV3Api.Account.GetAccountInfoAsync path from /account to /accountWithJoinMargin
  • Added client.FuturesV3Api.Account.GetWithdrawInfoAsync endpoint
  • Added client.FuturesV3Api.Account.GetDepositWithdrawHistoryAsync endpoint

• Version 3.0.1 - 02 Apr 2026

  • Updated CryptoExchange.Net to version 11.0.3, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Fixed FuturesV3 UserStream endpoints

• Version 3.0.0 - 24 Mar 2026

  • Updated CryptoExchange.Net to version 11.0.1, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes

  • Updated class for supplying API credentials from ApiCredentials to AsterCredentials

  • Added FuturesV3 and SpotV3 API's

  • Added 1bps builder fee enabled by default on V3 API, can be disabled in the options

  • Updated Shared order status parsing to default to Unknown value if not parsable

  • Added LastUpdateId property to AsterBookTicker model

  • Added Notional and IsolatedWallet properties to AsterPosition model

  • Added OrderListId property to AsterSpotOrder model

  • Added BaseAssetAddress and ListingTime properties to AsterSpotSymbol model

  • Added BaseAsset and QuoteAsset properties to AsterSpotTicker model

  • Added CounterpartyId property to AsterSpotUserTrade model

  • Added TwapMinNotional and CreateTime properties to AsterSymbol model

  • Added MarginAsset property to AsterUserTrade model

  • Added Testnet environment for the V3 API

  • Notes for updating:

    • Update ApiCredentials to AsterCredentials for authentication, i.e. ApiCredentials = new ApiCredentials(..) => ApiCredentials = new AsterCredentials(..)

• Version 2.8.0 - 06 Mar 2026

  • Updated CryptoExchange.Net to version 10.8.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Improved method XML comments

• Version 2.7.0 - 24 Feb 2026

  • Updated CryptoExchange.Net to version 10.7.0
  • Added additional Http settings to client options
  • Updated Shared REST interfaces pagination logic
  • Updated HttpClient registration, fixing issue of DNS changes not getting processed
  • Fixed UserClientProvider using unconfigured HttpClient

• Version 2.6.0 - 16 Feb 2026

  • Updated CryptoExchange.Net to version 10.6.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Fixed SymbolOrderBook websocket subscription not getting closed if when waiting for initial data times out

• Version 2.5.0 - 10 Feb 2026

  • Updated CryptoExchange.Net to version 10.5.1, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Updated UserClientProvider internal client cache to non-static to prevent cleanup issues

• Version 2.4.0 - 06 Feb 2026

  • Updated CryptoExchange.Net to version 10.4.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Added AsterUserSpotDataTracker and AsterUserFuturesDataTracker
  • Added additional methods for requesting supported symbols to Shared ISpotSymbolRestClient/IFuturesSymbolRestClient interfaces
  • Added PositionMode mapping on SharedPosition models
  • Fixed disposed clients getting returned from UserClientProvider

• Version 2.3.0 - 22 Jan 2026

  • Updated CryptoExchange.Net to version 10.3.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Removed legacy websocket message handling and the corresponding UseUpdatedDeserialization client option
  • Added Metadata to AsterExchange

• Version 2.2.2 - 19 Jan 2026

  • Updated CryptoExchange.Net to version 10.2.5, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Added Delisted value to SymbolStatus enum
  • Fixed some order book sync issues

• Version 2.2.1 - 14 Jan 2026

  • Updated CryptoExchange.Net to version 10.2.3, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes

• Version 2.2.0 - 13 Jan 2026

  • Updated CryptoExchange.Net to version 10.2.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Added SequenceNumber to order book websocket updates
  • Updated SymbolOrderBook implementations to correctly check sequence numbers

• Version 2.1.0 - 07 Jan 2026

  • Updated CryptoExchange.Net version to 10.1.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Added DataTimeLocal and DataAge properties to DataEvent object
  • Added UpdateServerTime, UpdateLocalTime and DataAge properties to (I)SymbolOrderBook
  • Added missing Spot references on IAsterOrderBookFactory

• Version 2.0.0 - 16 Dec 2025

  • Added Net10.0 target framework
  • Updated CryptoExchange.Net version to 10.0.0, see https://github.com/JKorf/CryptoExchange.Net/releases/ for full release notes
  • Improved performance across the board, biggest gains in websocket message processing
  • Updated REST message response handling
  • Updated WebSocket message handling
  • Added UseUpdatedDeserialization socket client options to toggle by new and old message handling
  • Added various Performance websocket subscriptions for public streams
  • Added SocketIndividualSubscriptionCombineTarget socket client option
  • Updated Shared API's subscription update types from ExchangeEvent to DataEvent
  • Fixed bug in Shared GetFuturesTickersAsync endpoint

• Version 1.3.0 - 11 Nov 2025

  • Updated CryptoExchange.Net version to 9.13.0, see https://github.com/JKorf/CryptoExchange.Net/releases/

• Version 1.2.0 - 03 Nov 2025

  • Updated CryptoExchange.Net to version 9.12.0
  • Added support for using SharedSymbol.UsdOrStable in Shared APIs
  • Fixed deserialization issue in restClient.FuturesApi.ExchangeData.GetFundingInfoAsync
  • Fixed exception when initial trade snapshot has no items in TradeTracker
  • Removed some unhelpful verbose logs

• Version 1.1.0 - 16 Oct 2025

  • Updated CryptoExchange.Net version to 9.10.0, see https://github.com/JKorf/CryptoExchange.Net/releases/
  • Added ClientOrderId mapping on SharedUserTrade models
  • Added ITransferRestClient.TransferAsync implementation
  • Updated SpotApi IBalanceRestClient.GetBalancesAsync to support funding wallet balance retrieval
  • Fixed FuturesApi IBalanceRestClient.GetBalancesAsync available balance mapping

• Version 1.0.0 - 06 Oct 2025

  • Initial release