Friday, May 22, 2026
Introducing SolDB
SolDB gives Solidity a shared debugging foundation: an open-source, ETHDebug-based, CLI-first debugger built with Argot Collective for frameworks, IDEs, and observability tools.
@romanmazur
New Partnership
Ethereum Foundation trusts us
with core infrastructure.
Together with Ethereum Foundation & Argot Collective,
we lead the implementation of ETHDebug in solc, the Solidity compiler.
Blockchain Research & Engineering
We focus on improving developer experience around smart contracts and transactions.
Debuggers & Simulations
Tools for inspecting, testing, and reproducing transaction execution.
- Miden Debugger
Debugger for Miden.
- Walnut Debugger
Debugger for EVM & Starknet.
- Arbitrum Stylus
CLI debugger for MultiVM.
Compilers & IRs
Compilers and intermediate representations for turning code into executable programs.
- solc
The Solidity compiler.
Explorers
Frontends for navigating and understanding onchain activity.
- Super Scan
Open-source block explorer for Superchain.
Playgrounds & Registries
Interactive environments for writing and running programs.
- Miden Playground
Interactive playground for Miden VM.
- Cairo Playground
Web playground for the CairoVM.
Testimonials
Teams use and love the things we build.
Hereʼs what they say.
“Transaction Debugging and Simulations are a big missing piece on Starknet, so it’s great to see Walnut providing developers with these essential tools.”
Ariel Elperin
PM and researcher at StarkWare
“Debugger and transaction simulator is a big missing piece in Starknet. At Argent, we are excited that this gap is being filled with Walnut.”
Sergio Garcia
Cairo Developer at Ready
“Debugging or simulating transactions is an absolutely critical task for any on-chain developer. We cannot wait to have Walnut integrated with Karnot and Madara Appchains.”
“Debugging transactions and performance monitoring are pain points on Starknet today. Every DeFi protocol builder woud benefit from better tooling, and it’s great to see Walnut addressing this need.”
Vukašin Manojlović
DEFI developer at Nostra
“I think Walnut is very important and that you [the Walnut team] are doing very valuable work for Starknet.”
“Walnut is an essential tool for debugging complex transactions with nested calls and large amounts of calldata. Walnut helped me with a massive blocker on the Bitcoin inscriptions project. 🌰”
“At Cartridge, we see a lot of interest in transaction debugging and simulation. Walnut has the potential to become a critical tool for game developers building on Starknet.”
“With Enso, we are not yet on Starknet. However, seeing a debugger and simulator like Walnut is a great testament to Starknet’s maturing devtools ecosystem, making it more appealing to new developers. We need a debugger and simulator to ship anything on Starknet, as we rely on this tooling in all EVM ecosystems and cannot build without it.”
Connor
CEO at Enso Finance
“We are thrilled about the Walnut integration with Dojo. Step-by-step debugging with instant replay of transactions will be another string to the bow for all the sensei building on Dojo.”
“At Nimbora, we are big supporters of Walnut and the transaction debugger and simulator for Starknet. We are looking forward to using it with Nimbora and integrating it with Devnet and Rivet, our new developer-focused wallet.”
Edi Sinovčić
CEO at Spaceshard
“Had to debug an OpenZeppelin tx on Starknet Sepolia—Walnut made it way too easy. Lifesaver!”
Adam Borco
Co-founder of Atomiq Labs
Debugger
Debug and Simulate
Transactions with Ease.
Try Debugger
Vesu uses Walnut Debugger to trace transactions, step through execution, and catch issues before they ship.
Blog
Writings From Walnut
Monday, May 11, 2026
We Shipped the Official Debugger for Arbitrum Stylus
We shipped the official open-source debugger for Arbitrum Stylus. StylusDB is a part of Arbitrum's official Stylus toolchain, available through Stylus CLI, recommended in Arbitrum docs, and open for anyone building on Stylus.
@romanmazur
Thursday, April 9, 2026
Walnut x Miden: Q1 2026 Update
Miden is a leading project bringing privacy to Ethereum, and we've been working with the team for over a year. This post covers our contributions to the Miden ecosystem during Q1 2026.
@romanmazur