eth-tester
eth-tester: Tools for testing Ethereum applications.
Decision gist · record as of 2026-08-14
Yes, if you are testing Ethereum applications locally. eth-tester is the standard in-memory simulator for the Ethereum Python ecosystem and has low install friction. However, be aware that maintenance is aging (last release 2025-04-23, no recent commits visible) and the pre-alpha classifier suggests it may not be production-hardened; verify test coverage and reliability for your specific use case before relying on it for critical contract validation.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Low install friction with a pure-Python wheel and six runtime dependencies.
- Maintenance status is aging—last release was 2025-04-23 and the repository shows no recent activity, though it remains unarchived and receives modest community attention (376 stars).
License · maintenance · safety
MIT (permissive) — MIT license permits free use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.
last release 2025-04-23 (478 days) · last repo commit 2025-12-15 · 376 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 287,304 downloads/mo, #8,034 on PyPI
Alternatives
Verify before relying
pip install eth-tester
from eth_tester import EthereumTester
t = EthereumTester()
accounts = t.get_accounts()
balance = t.get_balance(accounts[0])
tx_hash = t.send_transaction({
'from': accounts[0],
'to': accounts[1],
'value': 1,
'gas': 30000
})- Whether the pre-alpha status (Development Status :: 2) indicates active development or dormancy relative to the aging maintenance signal
- Current test coverage and reliability for production-grade contract testing workflows
- Support for specific transaction types and fee mechanisms beyond basic transaction submission
What it is and what it does
eth-tester is an in-memory Ethereum blockchain simulator that lets you test Ethereum applications and smart contracts locally without connecting to a live network. It provides a complete EthereumTester API for account management, transaction submission, block mining, and state queries—all running in Python with deterministic, reproducible behavior.
The library enforces strict input/output formats (hexadecimal strings for hashes and addresses, integers for numeric values) and includes features like auto-mining of transactions, time travel, and manual block mining. It depends on eth-abi, eth-account, eth-keys, eth-utils, rlp, and semantic_version to handle cryptographic operations and data encoding.
Use it for
- Unit testing smart contracts during development before deployment to testnet or mainnet
- Integration testing Ethereum dApps that interact with multiple accounts and contract state
- Prototyping blockchain logic and validating transaction flows without external dependencies
- Educational projects and tutorials demonstrating Ethereum mechanics in a controlled environment
- Simulating account operations and balance queries in isolation
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you are testing Ethereum applications locally.
eth-tester is the standard in-memory simulator for the Ethereum Python ecosystem and has low install friction. However, be aware that maintenance is aging (last release 2025-04-23, no recent commits visible) and the pre-alpha classifier suggests it may not be production-hardened; verify test coverage and reliability for your specific use case before relying on it for critical contract validation.
Install
eth-tester on PyPI
Before you install
Low install friction with a pure-Python wheel and six runtime dependencies. Maintenance status is aging—last release was 2025-04-23 and the repository shows no recent activity, though it remains unarchived and receives modest community attention (376 stars).
License in practice
MIT license permits free use, modification, and distribution with minimal restrictions, making it suitable for both open-source and commercial projects.
Quickstart
pip install eth-tester
from eth_tester import EthereumTester
t = EthereumTester()
accounts = t.get_accounts()
balance = t.get_balance(accounts[0])
tx_hash = t.send_transaction({
'from': accounts[0],
'to': accounts[1],
'value': 1,
'gas': 30000
})Verify before relying
- Whether the pre-alpha status (Development Status :: 2) indicates active development or dormancy relative to the aging maintenance signal
- Current test coverage and reliability for production-grade contract testing workflows
- Support for specific transaction types and fee mechanisms beyond basic transaction submission
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <4,>=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 6 packageseth-abieth-accounteth-keyseth-utilsrlpsemantic_version |
| Maintenance | Aging 478 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 287,304 / month, #8,034 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 2 - Pre-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: eth_tester-0.13.0b1-py3-none-any.whl
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See also eth-account · web3 · mythril · etherscan-python · eth-brownie · eth-bloom · py-evm · eth-keys · trie · pact-python