Download Crypto Currencies Data

Download Crypto Currencies Data

dccd downloads crypto-currency data (OHLCV, trades, order book) from 7 exchanges and stores it as nanosecond-precision Parquet — backfill history or stream live, from Python, a CLI, or a web UI. No API key required.

pip install dccd

import asyncio
from dccd import Client

async def main():
    async with Client() as c:
        await c.backfill("binance", "BTC/USDT", "ohlc", span=3600, start="2024-01-01")
        print(c.read("binance", "BTC/USDT", "ohlc", span=3600).tail())

asyncio.run(main())              # → a Polars DataFrame of hourly candles

New here? Start with Your first backfill.

Python API

Historical REST downloads and real-time WebSocket streams — use dccd directly in your scripts or notebooks.

Quickstart

CLI & Daemon

dccd command line: backfill, stream, start (daemon + web UI), migrate, inventory — driven by a YAML config.

CLI Reference

API Reference

The hexagonal layers — domain, transport, sources, storage, application, interfaces.

API Reference

Key features

• 7 exchanges — Binance, Coinbase, Kraken, Bybit, OKX, Bitfinex, BitMEX

• 3 data types — OHLCV candles, trade history, order book snapshots

• Async-first — async with Client() as c: await c.backfill(...); httpx + websockets

• Cursor-paginated trades — backfills drain the full window (no silent loss)

• Incremental & idempotent — start="last" resumes from the last bar; dedup on the natural key

• Nanosecond Parquet storage — ns UTC int64, provenance, atomic writes; read back as a polars.DataFrame

• No API key required — all endpoints used are public

• Autonomous daemon — YAML config, async scheduler, WebSocket streams, rclone remote sync

Guides

Architecture

The hexagonal layers and how a backfill flows through them.

Architecture

Exchanges

Per-exchange capabilities and OHLC field fidelity.

Exchanges

Supported exchanges

You pick a data type (OHLC · trades · order book) and an operation — backfill (download history) or stream (collect live). Each cell lists the data types an exchange supports for that operation.

Exchange	Backfill (history)	Stream (live)
Binance	OHLC · trades · book	OHLC · trades · book
Coinbase	OHLC · book · trades [1]	trades
Kraken	OHLC [2] · trades · book	OHLC · trades · book
Bybit	OHLC · book	OHLC · trades · book
OKX	OHLC · trades · book	OHLC · trades · book
Bitfinex	OHLC · trades · book	OHLC · trades
BitMEX	OHLC · trades · book	OHLC · trades · book

[1]

Coinbase trades backfill returns recent trades only (no deep history). Bybit spot has no trade history at all.

[2]

Kraken OHLC backfill serves the 720 most recent bars; a deeper request is clamped to that window. Order-book “backfill” is a single point-in-time snapshot.

See Exchanges for per-exchange notes and OHLC field fidelity. Bybit spot has no trade history at all (WS only). All other trade backfills are cursor-paginated and drain the full requested window.