An open-source Python tool to fetch on-chain blockchain data with 10+ GitHub stars and growing community adoption.
Aug 30, 2025GITHUB STARS
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TECH STACK
PythonPandasRequestsSelenium
An open-source Python tool to fetch on-chain blockchain data with 10+ GitHub stars and growing community adoption.
Aug 30, 202514
Accessing on-chain cryptocurrency data for analysis can be challenging: most websites do not have API access or require expensive commercial licenses (e.g. Glassnode 800$+).
I built chaindl to solve this problem — a Python library that allows anyone to fetch historical blockchain data, with a single function call, completely free.
First, install chaindl via pip:
$ pip install chaindl
Then, using chaindl is simple. Just import the library and call the download() function:
import chaindl
df = chaindl.download("https://charts.checkonchain.com/btconchain/pricing/pricing_picycleindicator/pricing_picycleindicator_light.html")For more advanced use cases and the full usage guide, see the documentation .
chaindl employs intelligent web scraping techniques to extract blockchain data from multiple public sources. Here's the technical architecture:
Automatically detects data source type using domain pattern matching and URL structure analysis.
Uses Selenium for dynamic content and Requests for static data, with custom parsers for each source.
Normalizes timestamps, handles missing values, and converts data types for consistent output format.
Returns clean pandas DataFrame ready for analysis, visualization, and further processing.
chaindl currently supports multiple popular blockchain data sources including CheckOnChain, ChainExposed, Woocharts, Cryptoquant, Bitbo Charts, Bitcoin Magazine Pro, Blockchain.com, Glassnode, The Block and Dune. The library automatically detects the source type and applies the appropriate scraping method. A comprehensive list can be found in the documentation.
Yes, chaindl is completely free and open-source under the MIT license. Unlike commercial APIs that charge hundreds of dollars per month, chaindl accesses publicly available data sources at no cost.
Currently, chaindl primarily focuses on Bitcoin and Ethereum data. Support for additional blockchains is planned for future releases based on community demand and data source availability.
Simply install via pip with 'pip install chaindl', then import the library and use the download() function with any supported URL. Check the documentation for detailed examples and usage patterns.
While paid APIs offer guaranteed uptime and support, chaindl provides free access to the same underlying data. It's perfect for research, learning, and projects that don't require enterprise-level SLAs.
Absolutely! chaindl is open-source and welcomes contributions. You can submit bug reports, feature requests, or pull requests on GitHub.
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