Read-only capital-buffer checks for proposed Safe transaction batches on Arbitrum Sepolia. Stops at the first unfunded or unknown call. Synthetic onchain demo; no transaction execution.
Kamui Capital Frontier is an early read-only risk-analysis prototype for proposed Safe Transaction Builder batches on Arbitrum. A Solidity view contract reads native and allowlisted ERC-20 balances. A Node adapter checks a batch at a fixed Arbitrum Sepolia block and reports the first call whose modeled outflow is unfunded or whose behavior is unknown. It does not sign, execute, or move assets.
A synthetic onchain demo holds 0.0009 testnet ETH in a Safe-shaped fixture. Three 0.00027 test ETH sends fit the nominal scenario; only two fit a 110% outflow stress plus 0.00005 test ETH reserve. A fourth arbitrary call is classified unknown. Eight local chain tests pass. The deployed fixture is not authentic Safe bytecode, and the tool has not been tested with real customer assets or audited.
The purpose is to give a reviewer a reproducible capital-buffer boundary before a batch is considered, while making assumptions explicit. Next work is authentic Safe integration, a clearer UI, and independent validation. Prize funds, if awarded, would support this open-source tool only; Kamui has separate asset-management activity and no regulatory approval is claimed here.