crypto-api-client 0.6.83

A client for interacting with crypto APIs.

crypto-api-client

A simple client library for multiple cryptocurrency exchange APIs.

Features

• Multi-Exchange Support
  • Supports BINANCE, bitbank, bitFlyer, Coincheck, GMO Coin, and Upbit (Most exchanges currently support ticker and order book retrieval. Additional endpoints can be added upon request or via pull requests).
• Async/Await Support
  • Fully asynchronous implementation using Python's asyncio.
• HTTP/2 and Connection Pooling
  • Built-in support for HTTP/2 and connection pooling for efficient API communication.
• Decimal Precision
  • Uses Decimal type instead of float or int to maintain precision in financial calculations.
• Unified Timestamp Handling
  • All timestamps are normalized to UTC datetime objects, regardless of exchange location or data format.
• Callback System
  • Register callbacks to execute before and after HTTP requests.
• Automatic Secret Masking
  • Automatically masks sensitive information (within reasonable limits) to prevent accidental exposure in logs or error monitoring services.
• Shared Rate Limiting
  • Provides a mechanism to share rate limit state across multiple clients using Redis.
• Proxy Support
  • Full support for HTTP/HTTPS proxies with optional authentication.

Examples

Public API

Retrieve ticker from BINANCE:

uv run python examples/binance/ticker.py --pair BTCUSDT --zone Asia/Tokyo

Retrieve order book from bitFlyer:

uv run python examples/bitflyer/board.py --pair BTC_JPY --price-band 100000

Documentation

Generate HTML documentation with the following commands:

# Generate API documentation
uv run sphinx-apidoc -f -o docs/source src/crypto_api_client

# Clean build directory
uv run sphinx-build -M clean docs/source docs/build

# Build English HTML documentation
uv run sphinx-build -M html docs/source docs/build

# Build Japanese HTML documentation
uv run sphinx-build -M html docs/source docs/build/ja -D language=ja

The generated documentation will be available at:

• English: docs/build/html/index.html
• Japanese: docs/build/ja/html/index.html

For terminology used throughout this library, please refer to the glossary.

Non-Goals

This library explicitly does not aim to:

• Synchronous Support: Only asynchronous connections are supported. Synchronous connections are not provided.
• High-Frequency Trading (HFT): This library is not designed for HFT use cases.
• Business Logic Error Handling: Error handling and recovery strategies driven by business logic are not implemented.
• Intelligent Types: Advanced types better suited for higher-level abstractions are not implemented.
• Default Error Validation: HTTP request precondition/postcondition error handling is not invoked by default.
  • Error handling for exchange-detected errors is implemented as add-on callbacks.
    • Use default error handling like examples/bitflyer/default_response_validator.py, or integrate custom error handling like examples/bitflyer/custom_response_validator.py.

Debugging with Visual Studio Code

Sample debug configurations are defined in launch.json.sample. Run them from the Run and Debug panel.

Installation

pip install crypto-api-client

Or using uv:

uv add crypto-api-client

Quick Start

Public API Example

import asyncio
from crypto_api_client import Exchange, create_session
from crypto_api_client.bitflyer import TickerRequest

async def main():
    async with create_session(Exchange.BITFLYER) as session:
        ticker = await session.api.ticker(TickerRequest(product_code="BTC_JPY"))
        print(f"Last Price: {ticker.ltp}")

asyncio.run(main())

Private API Example (with Authentication)

import asyncio
import os
from pydantic import SecretStr
from crypto_api_client import Exchange, create_session

async def main():
    async with create_session(
        Exchange.BITFLYER,
        api_key=SecretStr(os.environ["BITFLYER_API_KEY"]),
        api_secret=SecretStr(os.environ["BITFLYER_API_SECRET"])
    ) as session:
        balances = await session.api.getbalance()
        for balance in balances:
            print(f"{balance.currency_code}: {balance.available}")

asyncio.run(main())

Requirements

• Python 3.13+
• See pyproject.toml for complete dependency list

Development

Running Tests

uv run pytest tests/ -v

Running Examples

# Public API examples
uv run python examples/bitflyer/ticker.py --pair BTC_JPY --zone Asia/Tokyo
uv run python examples/binance/ticker.py --pair BTCUSDT --zone Asia/Tokyo

# Private API examples (requires API credentials)
export BITFLYER_API_KEY="your_api_key"
export BITFLYER_API_SECRET="your_api_secret"
uv run python examples/bitflyer/balances.py

Contributing

Contributions are welcome! Please feel free to submit pull requests or open issues for:

• Adding support for additional exchange endpoints
• Bug fixes and improvements
• Documentation enhancements
• New examples

License

Unlicense