Moving from 1.x

STX.Sdk 2.0 is a new SDK over the REST API and the WebSocket channels, authenticated with an API key. Nothing from 1.x carries across unchanged, so plan the move as a rewrite of the code that talks to the exchange. 1.x stays installable; to stay on it, pin the range: <PackageReference Include="STX.Sdk" Version="[1.6.2,2.0)" />.

1.x	2.0
Email and password login, sessions, token refresh	An API key: every request is signed. See Authentication
ConfigureSTXServices() and services resolved from DI	One STXClient per exchange; register it as a singleton if you use DI
STXMarketService, STXOrderService, STXTradeService, STXSettlementService	Methods on STXClient: GetMarketsAsync, PlaceOrderAsync, GetFillsAsync, GetSettlementsAsync
Channel classes and channel wrappers, one socket each	One STXWebSocket for every channel; OrdersAsync, FillsAsync, PositionsAsync, BalancesAsync, AccountViewAsync
decimal and double amounts, enums	Decimal strings exactly as the API sends them; statuses and actions as strings
STXEnvironment.OntarioDemo and friends	Region and Environment options, or a credentials profile. See Environments
.NET 8 and .NET 10	.NET 10

Cancel-on-disconnect works as before: arm it on the orders channel and opt each order in. See Cancel-on-disconnect.

Response models are generated from the REST API reference, so their fields follow the API: market.MarketId, order.ClientOrderId, position.NetPosition.