EasyTrading

A .NET client for decentralised perpetual and spot exchanges. One IExchangeClient interface across every supported DEX; per-DEX clients add only what's venue-specific (e.g. vaults and staking on HyperLiquid).

• Targets: net8.0, net9.0
• API reference: polius2007.github.io/EasyTrading (auto-generated DocFX site)
• Source: github.com/polius2007/EasyTrading
• License: MIT — see LICENSE

Status

Exchange	Package	REST	WebSocket	Signing	Latest
HyperLiquid	EasyTrading.HyperLiquid	✅	✅	✅	1.2.0
Aster	EasyTrading.Aster	✅	✅	✅	1.2.0
dYdX v4	EasyTrading.Dydx	✅	✅	✅	1.2.0

Coverage summary:

• HyperLiquid is stable. All Info (read) and Exchange (write) endpoints, including TWAP, scheduled cancel, sub-accounts, vaults, and staking. EIP-712 L1 and user-signed actions; byte-identical msgpack encoding with the Python reference SDK. WebSocket: 9 channels, per-subscriber back-pressure, automatic reconnect with exponential backoff. Pre-flight order validation (tick / lot / min-notional). REST retry policy with backoff + jitter, honours Retry-After on 429. WebSocket gap recovery: on reconnect, user streams auto-fetch missed events via REST and deduplicate against the live feed.
• Aster Finance is stable. Same surface, EIP-712 signing with AsterSignTransaction domain. Pre-flight validator wired to /fapi/v3/exchangeInfo filters (PRICE_FILTER / LOT_SIZE / MIN_NOTIONAL). WebSocket: Binance-style multiplex (market + listenKey-bound user streams with 30-min keepalive).
• dYdX v4 is stable. Indexer REST + public WebSocket + signed Indexer reads + full Cosmos SDK transaction assembly (BIP-39 → BIP-32 → secp256k1 → bech32 → protobuf TxRaw → REST broadcast). End-to-end verified on testnet: Testnet_PlaceLimit_and_Cancel places a far-from-market post-only BTC-USD buy from a freshly-faucet-funded wallet and cancels it; the chain accepts both. dydx-mainnet-1 and dydx-testnet-4 chain IDs supported out of the box.

Tests: 146 unit + 16 integration (live mainnet across HL, Aster, dYdX, plus dYdX testnet PlaceLimit + Cancel write verification), all green.

Install

dotnet add package EasyTrading.HyperLiquid
# or
dotnet add package EasyTrading.Aster

Either pulls EasyTrading.Abstractions and EasyTrading.Core transitively.

Quick start

using EasyTrading.Abstractions;
using EasyTrading.Aster;
using EasyTrading.HyperLiquid;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;

var host = Host.CreateApplicationBuilder(args);

host.Services
    .AddEasyTrading()
    .AddHyperLiquid(o =>
    {
        o.Network = HyperLiquidNetwork.Mainnet;
        o.Credentials = new HyperLiquidCredentials(
            masterAddress: "0xYourMasterAddress",
            privateKey:    Environment.GetEnvironmentVariable("HL_AGENT_KEY")!,
            agentName:     "easy-bot");
    })
    .AddAster(o =>
    {
        o.Network = AsterNetwork.Mainnet;
        o.Credentials = new AsterCredentials(
            MasterAddress: "0xYourMasterAddress",
            SignerAddress: "0xYourSignerAddress",
            PrivateKey:    Environment.GetEnvironmentVariable("ASTER_SIGNER_KEY")!);
    });

using var app = host.Build();
var hl    = app.Services.GetRequiredService<IHyperLiquidExchange>();
var aster = app.Services.GetRequiredService<IAsterExchange>();

// Read — works without credentials.
var mids = await hl.Markets.GetAllMidsAsync();
var book = await aster.Markets.GetOrderBookAsync("BTCUSDT", depth: 20);

// Write — signed.
var placed = await hl.Orders.PlaceLimitAsync(
    symbol: "BTC", side: OrderSide.Buy,
    price:  60_000m, size: 0.01m,
    tif:    TimeInForce.Alo);

// Stream.
await foreach (var trade in hl.Streams.TradesAsync("BTC", default))
    Console.WriteLine($"{trade.Trade.Price} {trade.Trade.Size}");

To write a strategy that doesn't care which venue it runs against, inject IExchangeClient instead of the venue-specific surface — every supported DEX implements the same shape.

A more complete walk-through with credential setup, agent wallets, and testnet-first guidance lives in docs/getting-started.md. Common patterns are collected in docs/recipes.md.

API surface

Methods are grouped by entity. Everything about orders is on Orders; everything about positions is on Positions; and so on.

Group	What it covers
Markets	Symbols, order book, candles, mids, funding
Orders	Place / modify / cancel / batch / TWAP / open / history
Positions	Read positions, set leverage, add/reduce margin, close
Trades	Your fills (by symbol, by order, by time)
Account	Balances, fees, portfolio, sub-accounts, agents, rate limit
Transfers	Withdraw, internal transfers, spot ↔ perp, sub-account moves
Streams	WebSocket subscriptions (public + user) via IAsyncEnumerable
Vaults (HL only)	Vault details, deposit, withdraw
Staking (HL only)	Delegate / undelegate / rewards

Design notes

• decimal everywhere for money — never double / float.
• DTOs are immutable record types.
• Async methods end with Async; CancellationToken ct = default is the last parameter on every method.
• WebSocket subscriptions are IAsyncEnumerable<T> — iterate with await foreach and cancel by cancelling the token.
• Optional venue features are gated by client.Capabilities.HasFlag(ExchangeCapabilities.X).
• Typed exceptions only: RateLimitException, InsufficientFundsException, InvalidOrderException, AuthenticationException, SigningException, ExchangeApiException.

Roadmap

• HyperLiquid — REST + WebSocket + EIP-712 signing + hardening → 1.2.0
• Aster — REST + WebSocket + EIP-712 signing → 1.2.0
• dYdX v4 — Indexer REST + WebSocket + Cosmos SDK signing (BIP-39 → BIP-32 → secp256k1 → bech32, full proto stack, REST broadcast), end-to-end verified on testnet → 1.2.0

Documentation

Getting started (tutorial)	docs/getting-started.md
Recipes (common patterns)	docs/recipes.md
API reference (auto-generated)	polius2007.github.io/EasyTrading
Changelog	CHANGELOG.md
Contributing	CONTRIBUTING.md
Security policy	SECURITY.md

For AI coding assistants

The repo ships first-class instructions so IDE assistants generate correct code without prompting:

Tool	File
Universal (any AI)	AGENTS.md
Claude Code	CLAUDE.md
GitHub Copilot	.github/copilot-instructions.md
Cursor IDE	.cursor/rules/easytrading.mdc
LLM crawlers / RAG	llms.txt

These files travel with the source; any fork or clone inherits the same guidance.

Disclaimer

This software is provided "as is", without warranty of any kind. Trading derivatives carries significant financial risk; use at your own responsibility. The authors are not affiliated with HyperLiquid, Aster, dYdX, or any other exchange.

The HyperLiquid client attaches a 0.5 bps (0.005%) builder fee to every order by default — this funds continued development. The fee is well below typical taker rates and visible on-chain as a separate field on each order action. The library calls approveBuilderFee once per account on the first order; nothing else is required from the consumer. To route fees to your own address set HyperLiquidClientOptions.BuilderFee; to opt out entirely, set its FeeRate to 0m.

License

MIT © 2026 Elinesoft