dcex 0.27.0

Rust-backed Python bindings for low-latency cross-exchange crypto trading.

dcex - DEX & CEX trading library

Important: No default broker tags are set. You may manually specify a broker tag within function arguments if needed.

Forked from krex, a simplified version of the ccxt Python library.

Originally created and maintained by the same contributor, this fork continues active development, building upon the original foundation with enhanced design, unified DEX + CEX support, and fixes for previously unresolved issues.

A high-performance and lightweight Python and Rust library for interacting with cryptocurrency exchanges. dcex offers Python clients backed by a Rust core, plus direct Rust APIs for low-level HTTP, WebSocket, signing, and exchange integrations.

Scope note: dcex focuses on market data, account queries, trading/order APIs, and market/user-data streams. External withdrawal creation endpoints are not currently wrapped, and options support is limited to exchange-specific APIs rather than the unified Product Table Manager.

Installation

Python:

pip install dcex

or use uv to manage the project:

uv add dcex

Rust:

cargo add dcex

Direct Rust usage is also documented in crates/dcex/README.md.

Quick Start

Python Synchronous Usage

import dcex

client = dcex.binance()

klines = client.get_klines(product_symbol="BTC-USDT-SWAP", interval="1m")
print(klines)

Python Asynchronous Usage

import os
import asyncio
import dcex.async_support as dcex
from dotenv import load_dotenv

load_dotenv()

BINANCE_API_KEY = os.getenv("BINANCE_API_KEY")
BINANCE_API_SECRET = os.getenv("BINANCE_API_SECRET")

async def main():
    client = await dcex.binance(
        api_key=BINANCE_API_KEY,
        api_secret=BINANCE_API_SECRET
    )

    try:
        result = await client.get_income_history()
        print(result)

    finally:
        await client.close()

if __name__ == "__main__":
    asyncio.run(main())

Python WebSocket Usage

import asyncio

from dcex.ws import binance


async def main():
    async with binance.public() as ws:
        await ws.subscribe_agg_trades("BTC-USDT-SPOT")
        print(await ws.recv())


if __name__ == "__main__":
    asyncio.run(main())

Rust Usage

use std::time::Duration;

use dcex::exchanges::binance::BinanceClient;

#[tokio::main]
async fn main() -> dcex::Result<()> {
    let api_key = std::env::var("BINANCE_API_KEY").expect("Set BINANCE_API_KEY");
    let api_secret = std::env::var("BINANCE_API_SECRET").expect("Set BINANCE_API_SECRET");
    let client = BinanceClient::new(Some(api_key), Some(api_secret), Duration::from_secs(10))?;
    let response = client.get_income_history().await?;
    println!("{}", response.data);
    Ok(())
}

Rust HTTP methods that do not require endpoint parameters can be called without passing None or an empty parameter list. Optional query/body parameters are added with builder setters such as .limit(100) or .param("key", value).

Supported Exchanges

Exchange	HTTP Sync	HTTP Async	WS Public	WS Private
Binance	Yes	Yes	Yes	Yes
Bybit	Yes	Yes	Yes	Yes
OKX	Yes	Yes	Yes	Yes
Bitget	Yes	Yes	Yes	Yes
Kraken	Yes	Yes	Yes	Yes
MEXC	Yes	Yes	Yes	Yes
BitMart	Yes	Yes	Yes	Yes
BitMEX	Yes	Yes	Yes	Yes
Gate.io	Yes	Yes	Yes	Yes
BingX	Yes	Yes	Yes	Yes
KuCoin	Yes	Yes	Yes	Yes
Hyperliquid	Yes	Yes	Yes	Yes
Lighter	Yes	Yes	Yes	Yes
Backpack	Yes	Yes	Yes	Yes
Aster	Yes	Yes	Yes	Yes
Extended	Yes	Yes	Yes	Yes

WS private support currently covers authenticated or address-scoped user-data streams. Order placement and cancellation remain on HTTP clients.

Key Features

• Product Table Manager for unifying trading instruments across exchanges
• HTTP clients with consistent sync and async interfaces where available
• Native Rust core for exchange HTTP, WebSocket, signing, serialization, and response validation
• Public and private WebSocket stream clients across the supported exchanges
• Direct Rust crate (dcex) for applications that do not need the Python layer
• Opt-in live test suites for public, private, stateful, and generated-report endpoints

What is Product Table Manager (PTM)?

PTM is a utility that standardizes and unifies trading instrument metadata across different exchanges, making cross-exchange strategy development easier.

It is a table that contains the following columns:

Column	Description
exchange	The exchange name
product_symbol	The symbol we use to identify the product, it will be the same in different exchanges. For example, BTC-USDT-SWAP is the same product in Binance and Bybit, which named BTCUSDT in Binance and BTC-USDT-SWAP in OKX.
exchange_symbol	The symbol that the exchange actually uses
product_type	The normalized product type used by dcex, e.g. spot, swap, futures
exchange_type	The exchange-specific product type, e.g. spot, linear, inverse, perpetual, delivery
base_currency	The base currency, e.g. BTC
quote_currency	The quote currency, e.g. USDT
price_precision	The price precision, e.g. 0.000001
size_precision	The size precision, e.g. 0.000001
min_size	The minimum size, e.g. 0.000001
min_notional	The minimum notional, e.g. 0.000001
size_per_contract	The size per contract. Sometimes 1 contract is not the same as 1 unit in exchanges like OKX.

Options are not currently included in the unified PTM output. Some exchange-specific clients expose option-related parameters or market endpoints, but options are not normalized across exchanges.

How to use Product Table Manager?

In most cases, dcex handles product-symbol mapping internally. If you have a specific use case, you can use ptm to get the information you need.

from dcex.utils.common import Common
from dcex.product_table.manager import ProductTableManager

ptm = ProductTableManager.get_instance(Common.BINANCE)

product_symbol = ptm.get_product_symbol(
    exchange=Common.BINANCE,
    exchange_symbol="BTCUSDT",
    product_type="swap",
)

print(product_symbol)

rows = ptm.rows()
ptm.write_csv("binance_product_table.csv")

Contributing

Contributions are welcome through GitHub issues and pull requests. Run the default test suite before opening a pull request.

Testing

The default test suite is offline and does not require exchange API keys or network access:

uv run pytest

Live, private, stateful, and generated-report tests use the pytest markers configured in pyproject.toml. These tests are opt-in because they can require network access, exchange credentials, or account state.

Benchmarking

Local CPU-bound benchmarks isolate Lighter signing and hashing hot paths. The recorded sample below compares an older native-Python baseline with current published Rust-backed artifacts and keeps package versions fixed so the comparison is repeatable on the same machine. The benchmark auto-calibrates per-operation inner loops and aggregates multiple process runs to reduce timer, GC, and scheduler noise.

Recorded sample (uv run python scripts/benchmark_core_local.py --iterations 50 --warmup 5 --target-batch-ms 100 --process-runs 3 --python-baseline-version 0.21.2 --pyo3-version 0.26.3 --rust-crate-version 0.4.4, 2026-07-03):

Baseline: PyPI dcex==0.21.2 native Python implementation = 1.00x. Rust-backed Python: PyPI dcex==0.26.3; Rust native: crates.io dcex==0.4.4.

Operation	Rust-backed Python	Rust native
Cryptographic hash	92.45x	113.10x
Schnorr signature	607.72x	596.91x
Transaction payload signing	491.29x	514.83x

Layer	Command	Output
Local CPU-bound release artifacts	uv run python scripts/benchmark_core_local.py --iterations 50 --warmup 5 --target-batch-ms 100 --process-runs 3 --python-baseline-version 0.21.2 --pyo3-version 0.26.3 --rust-crate-version 0.4.4	Speedup table
Optional local CPU-bound CSV output	uv run python scripts/benchmark_core_local.py --csv benchmark_core.csv	Ignored local CSV file

The Python benchmark scripts install PyPI packages into temporary target directories with uv pip install --target, then compile the Rust benchmark harness against the requested crates.io package version. They do not mutate the current environment. Use --python-baseline-version, --pyo3-version, and --rust-crate-version when you need to compare against other published artifacts.

Release Publishing

The release workflow detects Conventional Commit changes on main and plans Python and Rust releases independently. A bumped Python release builds wheels and publishes the Python package to PyPI. If no Python version bump is detected, PyPI is not updated.

The Rust crate has an independent version in crates/dcex/Cargo.toml and is published from rust-v* tags. For example, rust-vX.Y.Z publishes crate version X.Y.Z to crates.io and creates a separate GitHub Release. The crates/dcex-python package is an internal PyO3 build crate and is not published to crates.io; the Python package version is managed only in pyproject.toml.

License

This project is licensed under the MIT License.

Support

• Issues: Report bugs and request features on GitHub Issues.
• Discussions: Discuss ideas and share your thoughts on GitHub Discussions.

Disclaimer

Cryptocurrency trading involves significant risk. This library is provided as-is without any warranty. Users are responsible for their own trading decisions and risk management.