b3quant 0.1.6

Python library for downloading and parsing B3 (Brazilian Stock Exchange) market data

b3quant

Python library for downloading and parsing historical market data from B3 (Brazilian Stock Exchange).

Features

• Download COTAHIST files - Yearly or daily historical data
• Parse to pandas DataFrames - Clean, typed data ready for analysis
• Filter by instrument type - Options, stocks, or all instruments
• Simple, Pythonic API - Intuitive interface
• Type hints - Full type annotations for better IDE support
• Caching - Avoid redundant downloads
• No R dependencies - Pure Python implementation

Installation

pip install b3quant

Quick Start

import b3quant as pyb

# Get all options traded in 2024
options = pyb.get_options(year=2024)

# Filter by underlying asset
petr_options = options[options['underlying'] == 'PETR']

# Get specific columns
print(options[['ticker', 'strike_price', 'close_price', 'volume']].head())

Usage

Basic Usage

from b3quant import b3quant

# Initialize
b3 = b3quant()

# Get options for a single year
options_2024 = b3.get_options(year=2024)

# Get options for multiple years
options_historical = b3.get_options(years=(2020, 2024))

# Get stocks data
stocks_2024 = b3.get_stocks(year=2024)

# Get all instruments
all_data = b3.get_all(year=2024)

Working with Options Data

import b3quant as pyb

# Get options
options = pyb.get_options(year=2024)

# Filter by type
calls = options[options['instrument_type'] == 'CALL']
puts = options[options['instrument_type'] == 'PUT']

# Filter by underlying
petr_options = options[options['underlying'] == 'PETR']

# Get options near expiration
short_term = options[options['days_to_maturity'] <= 30]

# Calculate moneyness (requires underlying price)
# You'll need to merge with stocks data or calculate separately

Advanced: Enrich with Underlying Prices

from b3quant import b3quant

b3 = b3quant()

# Get options and stocks
options = b3.get_options(year=2024)
stocks = b3.get_stocks(year=2024)

# Merge to get underlying prices
options_enriched = options.merge(
    stocks[['ticker', 'trade_date', 'close_price']],
    left_on=['underlying', 'trade_date'],
    right_on=['ticker', 'trade_date'],
    how='left',
    suffixes=('', '_underlying')
)

# Calculate moneyness
options_enriched['moneyness'] = (
    options_enriched['close_price_underlying'] / 
    options_enriched['strike_price']
)

# Filter ATM options (at-the-money)
atm_options = options_enriched[
    (options_enriched['moneyness'] >= 0.95) & 
    (options_enriched['moneyness'] <= 1.05)
]

Custom Cache Directory

from b3quant import b3quant

# Use custom cache directory
b3 = b3quant(cache_dir="./my_data_cache")
options = b3.get_options(year=2024)

Force Re-download

# Force re-download even if file exists in cache
options = b3.get_options(year=2024, force_download=True)

DataFrame Schema

Options Data

Column	Type	Description
record_type	str	Record type code
trade_date	date	Trading date
ticker	str	Option ticker (e.g., PETRL255)
instrument_type	str	CALL or PUT
underlying	str	Underlying asset code (e.g., PETR)
company_name	str	Company name
strike_price	float	Strike price in BRL
maturity_date	date	Expiration date
open_price	float	Opening premium
high_price	float	Highest premium
low_price	float	Lowest premium
close_price	float	Closing premium
avg_price	float	Average premium
volume	float	Trading volume in BRL
trades_count	int	Number of trades
quantity	int	Contracts traded
days_to_maturity	int	Days until expiration
time_to_maturity	float	Years until expiration

Stocks Data

Similar schema but without strike_price, maturity_date, and option-specific fields.

Examples

Example 1: Calculate Implied Volatility Surface

import b3quant as pyb
import pandas as pd

# Get PETR4 options
options = pyb.get_options(year=2024)
petr_opts = options[options['underlying'] == 'PETR'].copy()

# Filter valid data
petr_opts = petr_opts[
    (petr_opts['close_price'] > 0) &
    (petr_opts['volume'] > 0) &
    (petr_opts['days_to_maturity'] > 0)
]

# You would then calculate IV using Black-Scholes
# (requires additional libraries like scipy)
# ... your IV calculation here ...

Example 2: Analyze Option Volume by Strike

import b3quant as pyb
import matplotlib.pyplot as plt

options = pyb.get_options(year=2024)

# Filter PETR4 calls expiring in January 2025
petr_calls = options[
    (options['underlying'] == 'PETR') &
    (options['instrument_type'] == 'CALL') &
    (options['maturity_date'] >= '2025-01-01') &
    (options['maturity_date'] < '2025-02-01')
]

# Group by strike
volume_by_strike = petr_calls.groupby('strike_price')['volume'].sum()

# Plot
volume_by_strike.plot(kind='bar', figsize=(12, 6))
plt.title('PETR4 Call Options Volume by Strike (Jan 2025)')
plt.xlabel('Strike Price')
plt.ylabel('Volume (BRL)')
plt.show()

Development

See docs/DEVELOPMENT.md for detailed development setup and guidelines.

Quick start:

# Clone and setup
git clone https://github.com/renves/b3quant.git
cd b3quant
uv sync

# Run tests
uv run pytest -v

# Lint code
uv run ruff check b3quant/

CAPTCHA Handling

B3 sometimes requires CAPTCHA for downloads. If automatic download fails:

1. Download manually from B3 website
2. Save to cache directory (default: ./data/raw/)
3. Parse the file directly:

from b3quant.parsers.cotahist import COTAHISTParser

parser = COTAHISTParser()
options = parser.parse_file('path/to/COTAHIST_A2024.TXT', instrument_filter='options')

Data Source

All data comes from B3 (Brasil, Bolsa, Balcão) official historical data files.

• Format: COTAHIST (fixed-width text format, 245 bytes per line)
• Update frequency: Daily
• Historical depth: Since 1986
• License: Data is publicly available from B3

Contributing

Contributions are welcome! See docs/CONTRIBUTING.md for detailed guidelines.

Quick summary:

1. Fork the repository
2. Create a feature branch (git checkout -b feat/amazing-feature)
3. Make your changes and add tests
4. Run tests and linter
5. Commit with conventional commits format
6. Open a Pull Request

License

This project is licensed under the MIT License - see the LICENSE file for details.

Disclaimer

This library is not affiliated with or endorsed by B3. It is an independent project for educational and research purposes.

Market data provided by B3 is subject to their terms of use. Please review B3's data policies before using this library for commercial purposes.

Credits

This library was inspired by and builds upon the work of:

• rb3 by Wilson Freitas - R package for downloading B3 data
• b3fileparser by Carlos Oliveira - Python parser for COTAHIST files

b3quant combines the functionality of both libraries into a unified, Pythonic interface with additional features and optimizations.

Citation

If you use this library in your research, please cite:

@software{b3quant2024,
  author = {Renan Alves},
  title = {b3quant: Python library for B3 market data},
  year = {2024},
  url = {https://github.com/renves/b3quant}
}

Documentation

• Development Guide - Setup and development workflow
• Contributing Guide - How to contribute
• Publishing Guide - Release and publishing process
• Changelog - Version history

Support

• 🐛 Issue Tracker
• 💬 Discussions