faster-eth-abi
A ~2-6x faster fork of eth_abi: Python utilities for working with Ethereum ABI definitions, especially encoding and decoding. Implemented in C.
Decision gist · record as of 2026-08-14
Yes, if you are already using eth-abi and need faster encoding/decoding performance. The drop-in compatibility and active maintenance make it a low-risk swap. No if you are not performance-constrained or if you need Python versions below 3.10. The medium install friction (compiled wheels) is offset by broad platform coverage and permissive licensing.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later; compiled wheels available for common platforms but may require build tools on unsupported architectures.
- Medium install friction due to compiled wheels across multiple platforms and Python versions (3.10–3.14).
- Active maintenance with recent releases; last commit 2026-08-11.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions; you may use, modify, and distribute this package freely provided you include the license notice.
last release 2026-07-11 (34 days) · last repo commit 2026-08-11 · 1 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 223,096 downloads/mo, #9,252 on PyPI
Alternatives
Verify before relying
pip install faster-eth-abi
from eth_abi import encode, decode
# Encode and decode contract ABI data- Actual performance improvement magnitude (2–6x claimed) on real workloads and whether it varies significantly by operation type.
- Compatibility guarantees with eth-abi beyond exception inheritance; whether all encoding/decoding edge cases are identical.
- Whether the C implementation handles all Ethereum type variants that eth-abi supports.
What it is and what it does
faster-eth-abi is a C-compiled fork of eth-abi that encodes and decodes Ethereum contract ABI data—the binary format used to call smart contracts and interpret their return values. It maintains API and exception compatibility with eth-abi, so you can swap it in as a drop-in replacement without rewriting exception handlers or call sites. The package depends on cchecksum, faster-eth-utils, eth-abi, eth-typing, mypy_extensions, and parsimonious to handle checksum validation, type annotations, and parsing.
The fork targets performance-critical Ethereum applications where encoding/decoding throughput matters. It compiles hot paths to C while keeping the Python interface unchanged. The project is actively maintained and tracks upstream eth-abi releases, so new ABI features and bug fixes are incorporated. It supports Python 3.10 through 3.14 on CPython with pre-built wheels for macOS (ARM), Linux (x86_64, i686, musl), and Windows.
Use it for
- Speed up batch transaction encoding in high-frequency trading or arbitrage bots that process many contract calls per second.
- Reduce latency in RPC middleware or indexing services that decode contract events and call results at scale.
- Improve performance of local contract simulators or testing frameworks that repeatedly encode/decode ABI data.
- Replace eth-abi in existing Ethereum libraries or applications without refactoring exception handling or API calls.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are already using eth-abi and need faster encoding/decoding performance.
The drop-in compatibility and active maintenance make it a low-risk swap. No if you are not performance-constrained or if you need Python versions below 3.10. The medium install friction (compiled wheels) is offset by broad platform coverage and permissive licensing.
Install
faster-eth-abi on PyPI
Before you install
Medium install friction due to compiled wheels across multiple platforms and Python versions (3.10–3.14). Active maintenance with recent releases; last commit 2026-08-11. Six runtime dependencies add some complexity, though the project tracks upstream eth-abi updates.
Requires Python 3.10 or later; compiled wheels available for common platforms but may require build tools on unsupported architectures.
License in practice
MIT license permits commercial and private use with minimal restrictions; you may use, modify, and distribute this package freely provided you include the license notice.
Quickstart
pip install faster-eth-abi
from eth_abi import encode, decode
# Encode and decode contract ABI dataVerify before relying
- Actual performance improvement magnitude (2–6x claimed) on real workloads and whether it varies significantly by operation type.
- Compatibility guarantees with eth-abi beyond exception inheritance; whether all encoding/decoding edge cases are identical.
- Whether the C implementation handles all Ethereum type variants that eth-abi supports.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <4,>=3.10 |
| Install friction | Medium. Platform-specific wheel |
| Runtime dependencies | 6 packagescchecksumfaster-eth-utilseth-abieth-typingmypy_extensionsparsimonious |
| Maintenance | Actively maintained 34 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 223,096 / month, #9,252 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersNatural Language :: EnglishProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Implementation :: CPython |
Evidence: faster_eth_abi-5.2.31-cp310-cp310-macosx_11_0_arm64.whl; faster_eth_abi-5.2.31-cp310-cp310-manylinux1_i686.manylinux_2_28_i686.manylinux_2_5_i686.whl; faster_eth_abi-5.2.31-cp310-cp310-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; faster_eth_abi-5.2.31-cp310-cp310-musllinux_1_2_x86_64.whl; faster_eth_abi-5.2.31-cp310-cp310-win32.whl; faster_eth_abi-5.2.31-cp310-cp310-win_amd64.whl; faster_eth_abi-5.2.31-cp311-cp311-macosx_11_0_arm64.whl; faster_eth_abi-5.2.31-cp311-cp311-manylinux1_i686.manylinux_2_28_i686.manylinux_2_5_i686.whl; faster_eth_abi-5.2.31-cp311-cp311-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; faster_eth_abi-5.2.31-cp311-cp311-musllinux_1_2_x86_64.whl; faster_eth_abi-5.2.31-cp311-cp311-win32.whl; faster_eth_abi-5.2.31-cp311-cp311-win_amd64.whl; faster_eth_abi-5.2.31-cp312-cp312-macosx_11_0_arm64.whl; faster_eth_abi-5.2.31-cp312-cp312-manylinux1_i686.manylinux_2_28_i686.manylinux_2_5_i686.whl; faster_eth_abi-5.2.31-cp312-cp312-manylinux2014_x86_64.manylinux_2_17_x86_64.manylinux_2_28_x86_64.whl; faster_eth_abi-5.2.31-cp312-cp312-musllinux_1_2_x86_64.whl; faster_eth_abi-5.2.31-cp312-cp312-win32.whl; faster_eth_abi-5.2.31-cp312-cp312-win_amd64.whl; faster_eth_abi-5.2.31-cp313-cp313-macosx_11_0_arm64.whl; faster_eth_abi-5.2.31-cp313-cp313-manylinux1_i686.manylinux_2_28_i686.manylinux_2_5_i686.whl
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See also faster-eth-utils · cchecksum · eth-rlp · rlp · bech32m · ethereum-dasm · abi3info · scalecodec · vyper