clvm
[Contract Language | Chialisp] Virtual Machine
Decision gist · record as of 2026-08-14
Yes, if you are developing on the Chia blockchain or need to execute Chialisp contracts in Python. The package is actively maintained, has no known vulnerabilities, and installs cleanly. However, it is in Alpha status, so expect API changes and verify production readiness for your use case before committing to it in critical systems.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8.1 or later; depends on chia_rs which may require a Rust toolchain for compilation on some platforms.
- Low install friction with a pure-Python wheel distribution.
- The package is actively maintained with recent commits and supports current Python versions (3.8 through 3.11).
License · maintenance · safety
permissive license (permissive) — Apache 2.0 permissive license allows commercial and private use with minimal restrictions, making it suitable for production deployment in proprietary systems.
last release 2025-09-17 (331 days) · last repo commit 2026-08-14 · 89 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 124,789 downloads/mo, #11,852 on PyPI
Alternatives
Verify before relying
pip install clvm
import clvm
# Use the virtual machine to execute Chialisp contracts
# See https://chialisp.com/ for language documentation- Whether chia_rs requires compilation from source on all platforms or if pre-built wheels are available
- Performance characteristics and typical execution speed for contract evaluation
- Maturity level beyond 'Alpha' status and production readiness guarantees
What it is and what it does
clvm is a virtual machine implementation for Chialisp, a LISP-like smart contract language designed for the Chia blockchain. It interprets and executes Chialisp programs that define conditions for spending cryptocurrency—essentially a runtime for writing contracts that encumber and release funds based on cryptographic proofs and other conditions.
The package is in active development (Alpha status) and maintained by the Chia Network team. It depends on chia_rs for performance-critical operations and uses standard library compatibility shims (importlib_metadata, typing-extensions) for broad Python version support. It's positioned as a developer tool for blockchain engineers building on Chia, not a general-purpose language runtime.
Use it for
- Building Chia blockchain smart contracts that define spending conditions and fund release logic
- Testing Chialisp programs locally before deployment to a live blockchain network
- Integrating Chia contract execution into Python-based wallet or node software
- Prototyping cryptocurrency payment schemes and escrow logic using Chialisp syntax
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are developing on the Chia blockchain or need to execute Chialisp contracts in Python.
The package is actively maintained, has no known vulnerabilities, and installs cleanly. However, it is in Alpha status, so expect API changes and verify production readiness for your use case before committing to it in critical systems.
Install
clvm on PyPI
Before you install
Low install friction with a pure-Python wheel distribution. The package is actively maintained with recent commits and supports current Python versions (3.8 through 3.11). Three runtime dependencies keep the dependency tree manageable.
Requires Python 3.8.1 or later; depends on chia_rs which may require a Rust toolchain for compilation on some platforms.
License in practice
Apache 2.0 permissive license allows commercial and private use with minimal restrictions, making it suitable for production deployment in proprietary systems.
Quickstart
pip install clvm
import clvm
# Use the virtual machine to execute Chialisp contracts
# See https://chialisp.com/ for language documentationVerify before relying
- Whether chia_rs requires compilation from source on all platforms or if pre-built wheels are available
- Performance characteristics and typical execution speed for contract evaluation
- Maturity level beyond 'Alpha' status and production readiness guarantees
Package facts
| License | permissive license permissive |
| Python support | Supports the current Python release <4,>=3.8.1 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packageschia_rsimportlib_metadatatyping-extensions |
| Maintenance | Actively maintained 331 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 124,789 / month, #11,852 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 3 - AlphaLicense :: OSI Approved :: Apache Software LicenseProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9Topic :: Security :: Cryptography |
Evidence: clvm-0.9.15-py3-none-any.whl
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See also clvm-tools · clvm-rs · clvm-tools-rs · py-evm · vyper · chialisp-puzzles · eth-brownie · mythril · chia-puzzles-py · web3