Last updated 08-09-2026
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ContractReader
ContractReader is a browser-based smart contract reader for EVM chains. Enter a contract address or Etherscan URL, pick a network from Mainnet, Sepolia, OP Mainnet, Polygon, Arbitrum One, Base, or BNB Smart Chain, and the site loads highlighted Solidity with live on-chain values beside the code. You can also open featured contracts like WETH9 or NounsToken to explore without hunting addresses first.
The reader focuses on comprehension, not just file display. Syntax highlighting clarifies structure, testnet support lets you inspect staging deployments, and an in-browser compare mode lines up code versions side by side. That combination matters when you are tracing inherited logic or verifying what changed between proxy upgrades.
ContractReader also ships a separate Audit Tool in beta signup. That workflow adds private code pages, raw code paste, ENS-based access control, threaded comments, GPT-4 security reviews, and read/write contract calls from the same interface. The public reader stays free for lookup and exploration while the audit workspace targets teams doing deeper review sessions.
Solidity developers, security researchers, and DeFi users who want to sanity-check a protocol before interacting fit the core audience. Founders Backseats and Plaid Shaman built ContractReader to make on-chain code easier to read without leaving the browser or juggling multiple block explorer tabs.
Loads contracts from an address or Etherscan URL across 7 EVM networks
Syntax highlighting with live on-chain values shown beside contract code
In-browser code compare for reviewing differences between versions
Audit Tool beta adds GPT-4 security reviews and read/write contract calls
Private code pages with ENS name access control and rich inline comments
Testnet imports supported on Sepolia and other listed networks
Seven EVM networks covered from a single address or Etherscan URL input
Live on-chain values sit next to highlighted Solidity for faster context
Audit Tool beta bundles comments, GPT-4 reviews, and contract write calls
Featured contracts like WETH9 and NounsToken offer quick demos without setup
Audit Tool collaboration features remain in beta with email signup required
No pricing page published for paid audit workspace tiers
Reader focuses on EVM chains listed on the site with no non-EVM support stated
How do you open a contract in ContractReader?
ContractReader accepts a contract address or full Etherscan URL. Select a network such as Mainnet, Sepolia, OP Mainnet, Polygon, Arbitrum One, Base, or BNB Smart Chain, enter the address, and click Search to load the highlighted Solidity source.
Which blockchain networks does ContractReader support?
ContractReader lists seven networks: Ethereum Mainnet, Sepolia, OP Mainnet, Polygon, Arbitrum One, Base, and BNB Smart Chain. The network selector sits on both the homepage reader and the Audit Tool page.
Does ContractReader show live contract data?
Yes. ContractReader displays live on-chain values alongside contract code in the public reader. The Audit Tool beta also shows live on-chain values when you review or interact with imported contracts.
What does the ContractReader Audit Tool add?
The ContractReader Audit Tool beta adds private code pages, raw code paste, testnet imports, ENS-based access control, rich comments, GPT-4 security reviews, and read/write contract calls. Sign up with email on the Audit Tool page to join the beta.
Can you compare Solidity code in ContractReader?
Yes. ContractReader includes a compare code in-browser feature on the public reader so you can line up contract versions without exporting files. Syntax highlighting applies to both sides of the comparison view.
Is ContractReader free to use?
The public ContractReader lookup and exploration tools are free. The Audit Tool with GPT-4 security reviews and collaboration features is in beta and requires email signup on contractreader.io/audit-tool.