Web3 Development Services - Decentralized Application Experts

Web3.js (the Ethereum library at web3js.org) was officially archived on March 4, 2025. Do not use it for new projects. The standard replacements: viem (TypeScript-native, 35KB, strict ABI-derived types — recommended for new projects in 2026), ethers.js v6 (most widely used, 70% of Solidity devs, comprehensive ecosystem). wagmi is the React hooks layer that can use either underneath. For existing Web3.js projects, migration to ethers.js is lower-risk (more similar API); migration to viem provides stronger TypeScript safety.

wagmi is a React hooks library for Ethereum that abstracts wallet management, contract reads/writes, and transaction lifecycle into composable hooks. Without wagmi: manually manage wallet connection state, poll for balance updates, track transaction confirmations, handle chain switching events. With wagmi: useAccount() for wallet state, useReadContract() for contract reads (auto-caches, refetches on block), useWriteContract() for transactions with built-in pending/success/error states, useWatchContractEvent() for real-time events. wagmi uses either ethers.js or viem underneath — your choice.

ethers.js v6: mature, 70% adoption, comprehensive documentation, works everywhere. Slightly larger bundle. viem: TypeScript-native (strict ABI-derived types catch errors at compile time), 35KB bundle (40% smaller than ethers.js), modern API design inspired by ethers.js but with stricter safety. viem is increasingly the default for new TypeScript-first projects; ethers.js remains valid for projects prioritizing ecosystem compatibility and documentation depth. Both work with wagmi as the React layer on top.

WalletConnect v2 is a protocol that connects dApp frontends to crypto wallets across devices — browser extension wallets (MetaMask), mobile wallets (Rainbow, Trust Wallet), and hardware wallets (Ledger). The dApp displays a QR code or deep link; the wallet scans it and establishes an encrypted WebSocket session. WalletConnect v2 uses a relay server for message routing — dApp and wallet communicate without direct network connectivity. wagmi's createConfig with WalletConnect connector handles the integration with one package installation.

RainbowKit is a React library providing a polished wallet connection modal — it displays available wallets, handles WalletConnect QR codes, shows network switching UI, and provides customizable themes. It's built on top of wagmi + viem. Use it for: any consumer dApp where wallet UX quality matters, projects that don't want to build wallet connection UI from scratch, and applications targeting non-technical users who need clear wallet selection guidance. The customization options cover most brand requirements without forking.

Sign-In With Ethereum (EIP-4361) is a standard for wallet-based authentication — users sign a nonce message with their wallet, proving ownership of an Ethereum address. Implementation: (1) Frontend requests a nonce from your backend. (2) User signs a structured SIWE message with their wallet via wagmi's useSignMessage. (3) Backend verifies the signature using ethers.js or viem's verifyMessage. (4) Backend issues a session JWT tied to the verified Ethereum address. The siwe npm library handles message construction and verification according to the EIP-4361 standard.

Transaction lifecycle has three distinct states: (1) Submitted — transaction sent to mempool, not yet mined. (2) Confirmed — transaction included in a block. (3) Failed — transaction reverted on-chain. wagmi's useWriteContract provides isPending, isSuccess, isError, and the transaction hash for each state. For UX: show optimistic state immediately (assume success for most interactions), provide clear pending feedback with block explorer link, handle rejection gracefully (user can cancel in wallet), and display revert reasons from contract custom errors.

Don't use public RPCs in production — they rate-limit aggressively and experience downtime during high network usage. Production options: Alchemy (most popular, generous free tier, comprehensive API), Infura (Ethereum's original infrastructure, reliable), QuickNode (fastest raw performance), Drpc (decentralized, multi-provider aggregation). Configure primary + fallback providers in viem's createPublicClient with multiple transport fallbacks. Use Alchemy's Enhanced APIs for token balances, NFT data, and transaction simulation to reduce RPC call volume.

Multicall batches multiple read calls into one RPC request — instead of 10 separate eth_call requests, one call returns all 10 results. Wagmi uses multicall by default for useReadContracts. Use multicall when: displaying token balances for multiple tokens simultaneously, reading state from multiple contracts (DeFi protocol TVL across pools), or loading a list of NFT token URIs. Performance impact: reduces dashboard load time from 1-2 seconds (10 serial requests) to 100-200ms (one batched request).

We offer support covering: library updates as ethers.js, viem, wagmi, and RainbowKit release breaking-change versions, wallet compatibility updates as wallet providers change their APIs, RPC provider migrations, new contract integration as protocols expand, UI updates for new chain additions, and performance monitoring for RPC call patterns that create latency. We also provide rapid incident response if contract upgrades change ABIs that break the frontend.