---
id: cchecksum
version: "0.4.5"
license: MIT
license_treatment: permissive
maintenance: active
---

# cchecksum — An ~18x faster drop-in replacement for eth_utils.to_checksum_address. Raises the exact same Exceptions. Implemented in C.

License: permissive · Maintenance: active · Downloads: 287.6K/mo

## What it is and what it does

CChecksum is a performance-focused alternative to Ethereum address checksum validation. It wraps the CPU-intensive checksum computation in C code, delivering roughly 18x faster execution while keeping the same function signature, return values, and exception behavior. The package is designed as a drop-in replacement: you install it, import from cchecksum instead of eth_utils, and your existing code runs faster without modification.

The package depends on eth-hash, eth-typing, pysha3, and safe-pysha3 for cryptographic operations and type definitions. It targets CPython 3.9 through 3.14 and ships pre-compiled wheels for multiple architectures, reducing installation friction on standard platforms. With no known vulnerabilities and active maintenance, it is suitable for production use in Ethereum tooling and applications where address validation throughput matters.

Use it for:

- Accelerate bulk Ethereum address validation in data pipelines or batch processing tasks.
- Drop-in replacement in existing code to gain performance without refactoring.
- High-throughput blockchain indexing or transaction monitoring systems that validate many addresses.
- Reduce CPU overhead in API services that perform frequent address checksum validation.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Provides a C-accelerated implementation of Ethereum address checksum validation that is ~18x faster than the standard eth_utils version while maintaining identical API and exception behavior.

Yes, if you use Ethereum address checksum validation in a performance-sensitive context. The identical API and exception behavior make it a true drop-in replacement with no code changes required. Active maintenance, no vulnerabilities, and broad platform coverage make it low-risk. Install if the stated speedup justifies the medium wheel-installation friction on your target platforms.

## Install

pip install cchecksum
uv add cchecksum
poetry add cchecksum

## Installing cchecksum

Before you install: Medium install friction due to compiled wheels, but well-covered across Python 3.9–3.14 and major platforms. Active maintenance with recent release (35 days old) and no known vulnerabilities.

License in practice: MIT license is permissive; you can use, modify, and distribute this package freely in both open-source and commercial projects with minimal restrictions.

Quickstart:

pip install cchecksum

from cchecksum import to_checksum_address
checksum = to_checksum_address('0xexampleaddress')

Requires CPython 3.9 or later; wheels are pre-built for common architectures but installation may require a C compiler on unsupported platforms.

Verify before relying:

- Whether the package handles all edge cases and error conditions identically to eth_utils.to_checksum_address beyond the stated API match.
- Performance improvement magnitude (stated as ~18x) under real-world workloads and dataset sizes.

## Package facts

- License: MIT (permissive)
- Python support: supports_current
- Install friction: medium
- Maintenance: active
- Downloads: 287.6K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

ethereum address checksum, eth_utils replacement, fast checksum validation, ethereum address validation, C accelerated checksum, ethereum, performance-optimization, c-extension

[View on SkillFed](https://skillfed.io/packages/cchecksum) · [View on PyPI](https://pypi.org/project/cchecksum/)