rlp
rlp: A package for Recursive Length Prefix encoding and decoding
Decision gist · record as of 2026-08-14
Yes. It is actively maintained, has no known vulnerabilities, carries a permissive MIT license, and installs with minimal friction. Install it if you work with Ethereum, blockchain systems, or need RLP serialization; skip it if you have no use for that specific encoding format.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low friction installation with a pure Python wheel.
- Actively maintained as of 2026-07-16 with a single lightweight runtime dependency (eth-utils).
License · maintenance · safety
MIT (permissive) — MIT license permits use, modification, and distribution with minimal restrictions, making it suitable for both open-source and proprietary projects.
last release 2025-02-04 (556 days) · last repo commit 2026-07-16 · 103 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 6,009,921 downloads/mo, #1,984 on PyPI
Alternatives
Verify before relying
pip install rlp
import rlp
encoded = rlp.encode([b'hello', b'world'])
decoded = rlp.decode(encoded)- Whether the package handles edge cases like deeply nested structures or very large payloads
- Performance characteristics compared to alternative RLP implementations
- Completeness of RLP specification coverage beyond basic encode/decode
What it is and what it does
RLP is a serialization format that encodes nested byte arrays into a single byte string, widely used in Ethereum for encoding transactions, blocks, and other data structures. This package provides Python functions to encode Python data structures (lists, bytes) into RLP format and decode RLP-encoded bytes back into their original form.
The package is straightforward: you pass it data to encode or RLP bytes to decode, and it handles the serialization logic. It depends only on eth-utils, making it lightweight and suitable for integration into blockchain tools, Ethereum clients, or any system that needs to work with RLP-serialized data.
Use it for
- Encode transaction data for Ethereum network communication or storage
- Decode RLP-serialized blockchain data received from peers or APIs
- Serialize complex nested structures in blockchain applications
- Build Ethereum-compatible tools that need standard data encoding
- Test blockchain protocol implementations that rely on RLP format
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
It is actively maintained, has no known vulnerabilities, carries a permissive MIT license, and installs with minimal friction. Install it if you work with Ethereum, blockchain systems, or need RLP serialization; skip it if you have no use for that specific encoding format.
Install
rlp on PyPI
Before you install
Low friction installation with a pure Python wheel. Actively maintained as of 2026-07-16 with a single lightweight runtime dependency (eth-utils).
License in practice
MIT license permits use, modification, and distribution with minimal restrictions, making it suitable for both open-source and proprietary projects.
Quickstart
pip install rlp
import rlp
encoded = rlp.encode([b'hello', b'world'])
decoded = rlp.decode(encoded)Verify before relying
- Whether the package handles edge cases like deeply nested structures or very large payloads
- Performance characteristics compared to alternative RLP implementations
- Completeness of RLP specification coverage beyond basic encode/decode
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <4,>=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 1 packageeth-utils |
| Maintenance | Actively maintained 556 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 6,009,921 / month, #1,984 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 3 - AlphaIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseNatural Language :: EnglishProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: rlp-4.1.0-py3-none-any.whl
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See also eth-rlp · reedsolo · scalecodec · py-multicodec · leb128 · xdrlib3 · base58 · faster-eth-abi · bech32m · xrpl-py