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Your contract is on the KUB Testnet. Now your users need a frontend to interact with it. The KUB Docs "Build an App on KUB" guide walks through a small Next.js app using wagmi and viem that connects a wallet, reads from a contract, and writes to it. Setup uses tools you likely already know: create-next-app, then wagmi, viem, and TanStack Query. Recent viem versions include KUB definitions (bitkub and bitkubTestnet in viem/chains). You can also define KUB Testnet (Chain ID 25925) and KUB Mainnet (Chain ID 96) yourself with defineChain, which works on any version. The guide also covers three details that cause real bugs. First, handle the wrong-network case. KUB is a custom network in MetaMask, so first-time users are often on another chain. Without useSwitchChain, the write button can stay on "Confirm in Wallet" forever if the user misses the popup. Second, declare your ABI with "as const", or wagmi cannot infer function names and types. Third, use ssr: true with cookieStorage and cookieToInitialState so the connection state doesn't flash on page load. Also remember to fund the browser wallet from the KUB Faucet, not just your deployer key. When your app is ready, submit it to the KUB Developer Center to be listed in the KUB Ecosystem directory. Build it step by step: https://t.co/ZKG9sATkL1

Integrating a third-party token, oracle, or DEX into your protocol can accelerate development, but it also introduces your largest external attack surface. Even if a contract is deployed on KUB Mainnet and fully audited, assuming it is safe is a dangerous mistake. To protect your protocol and your users, every external component must be thoroughly vetted. Use this checklist before writing a single line of integration code. The Vetting Checklist 1. Analyze the Source Code - Never treat an external contract as a black box; you need to understand exactly what you are calling. Review the smart contracts specifically looking for admin overrides, pause mechanisms, and upgrade hooks—any of these can break your structural assumptions down the line. 2. Scrutinize the Governance Power - Identify who holds the keys to the contract. Is the admin a multi-sig, a decentralized DAO, or a single Externally Owned Account (EOA), which represents a massive security risk? Determine if the controllers can arbitrarily pause the contract, alter fee structures, or upgrade the core logic. 3. Review the Contract History - Past behavior is an excellent indicator of future risk. Look into whether the contract has ever been upgraded and under what circumstances. Search developer forums, GitHub issues, and social channels for past incidents, emergency pauses, or historical exploits. 4. Run Rigorous Testnet Simulations - Deploy and test your integration extensively on the KUB Testnet. Intentionally mock worst-case scenarios: - What happens to your protocol if the external contract suddenly pauses? - How does your code handle an unexpected revert? - What happens if it returns malformed or stale data? Build code fallbacks for each of these failure modes before moving to production. 5. Evaluate the Audit Validity - Not all audits carry the same weight. Verify the reputation of the security firm and check whether the engagement was a comprehensive, formal audit or just a cursory review. Most importantly, ensure the audit matches the exact commit hash of the code you are integrating, rather than an outdated version. 6. Architect a Clean Exit Strategy - You must design your off-boarding mechanism before something goes wrong, not after. Ensure your architecture is free of circular dependencies or locked liquidity that could trap user funds. Can you safely pause or decouple your integration without bricking your entire protocol? 7. Treat Integrations Like Team Members - Third-party smart contracts should be vetted with the same scrutiny you would apply to hiring a new core team member. By building defensively and planning for external failures, you ensure your app remains resilient. For more secure development standards on KUB, explore the developer resources at https://t.co/P8WWu5wXqV