Interface Segregation Auditor for Large Contracts

WHAT IT DOES

Interface Segregation Auditor for Large Contracts analyzes smart contract ABIs, control flow graphs, and inheritance hierarchies to evaluate how well a contract's interface adheres to the Interface Segregation Principle (ISP)—the "I" in SOLID. It retrieves on-chain contract bytecode via eth_getCode and fetches verified source code and ABI from block explorer APIs to extract function signatures, state variable dependencies, event definitions, and modifier structures. The tool builds a dependency graph linking each function to the state variables it reads or modifies, the events it emits, and the modifiers it applies. It then applies clustering algorithms to group functions by their state dependencies, identifying natural interface boundaries based on which functions operate on the same data. The output includes a cohesion score, suggested interface segments with their constituent functions, and a list of red flags indicating potential violations of the Interface Segregation Principle—such as functions that use disjoint state sets or have overlapping but non-cohesive responsibilities. This enables developers to identify opportunities for splitting large, monolithic contracts into smaller, more focused interfaces.

HOW TO USE

Connect your BGWallet to the target EVM chain. Paste the address of the contract you wish to audit. Optionally supply a GitHub repository URL to pull existing interface definitions, upgrade documentation, or segregation patterns for additional context. The tool fetches the contract's bytecode, ABI, and source code, builds a state dependency graph, and performs clustering analysis to identify cohesive function groups. Review the suggested interface segments, the cohesion score, and the list of red flags. Use the audit results to guide refactoring efforts, splitting large contracts into multiple smaller interfaces or contracts that adhere to the Interface Segregation Principle, improving maintainability and reducing the risk of unintended coupling.

STATE DEPENDENCY CLUSTERING AND COHESION ANALYSIS

The real technical mechanism is the state dependency clustering algorithm that identifies natural interface boundaries. The tool constructs a bipartite graph connecting functions to the state variables they access, with edges weighted by the frequency and type of access (read vs. write). It then applies a community detection algorithm—specifically, a modularity-based clustering approach—to group functions into cohesive clusters based on shared state dependencies. Functions that share multiple state variables and have similar access patterns are grouped together, while functions with disjoint state sets are separated. The algorithm also incorporates inheritance hierarchy information, identifying which functions are inherited from base contracts and whether they align with the proposed clustering. The cohesion score is computed as the ratio of intra-cluster state sharing to inter-cluster state sharing, normalized to a 0-100 scale. Additionally, the tool flags "orphan" functions that have minimal state dependencies and "hub" functions that access many unrelated state variables, both of which indicate potential segregation issues. This approach automates what is traditionally a manual, experience-driven process, reducing the effort required to identify interface boundaries from days to minutes and improving the overall design of large contract systems.

WHAT IT CANNOT SEE

This tool cannot audit interface segregation without access to contract bytecode or ABI. It is limited by your RPC provider's rate limits for bytecode retrieval, which may delay analysis on congested networks. It cannot detect logical coupling that does not manifest in the ABI surface—for example, functions that must be called in a specific order or that share implicit invariants not reflected in state variable access. The audit relies on the completeness of the ABI and source code verification; unverified contracts or incomplete verification data will produce incomplete or inaccurate results. The audit is based on structural analysis and may not capture all semantic cohesion or coupling issues, such as functions that are conceptually related but operate on different state variables. The tool cannot assess the quality or appropriateness of proposed interface boundaries—it suggests clusters based on state access, but these clusters may not align with business logic or domain boundaries. It may produce false positives for functions that are logically cohesive but appear unrelated in the ABI, requiring manual review. The tool does not execute the contract to validate segregation recommendations; all suggestions should be reviewed in the context of the contract's intended behavior.

PLEASE NOTE

This tool works exclusively with EVM-compatible chains. It requires active internet connectivity to access block explorer APIs and RPC endpoints. Some block explorers may require API keys for high-volume bytecode retrieval. The auditor is read-only and does not modify or deploy any code—it only produces audit recommendations. Always review segregation recommendations against your specific contract's logic, upgrade strategy, and business requirements before refactoring production contracts.