Ethers.js

Managing digital assets is becoming part of life for businesses and Web3 users. Today, more and more companies and independent developers are looking for answers to the following questions: how to build a cryptocurrency wallet, which frameworks to use, which features are essential in 2025–2026, and how to stand out in the market? This material is a detailed guide to creating a crypto wallet with proven examples. Experts note growing interest in digital asset management and the development of custom cryptocurrency storage solutions. Today, companies and independent developers view their own wallet as a tool for: conducting transactions; integration with DeFi and NFT; expanding business services; gaining competitive advantages. Creating your own crypto wallet opens access to unique markets and increases the level of control over your own funds. Key Questions Before the Start — Choosing Currencies, Target Audience, and Wallet Type Before development, it is useful to ask yourself direct questions. For example, which cryptocurrencies should be supported: Ethereum, Bitcoin, Solana, BNB, or all of them together? It is also useful to decide who the future product is intended for — the mass user, businesses, NFT collectors, or members of DAO — decentralized autonomous organizations. Each segment has its own requirements. Suitable solutions: non-custodial wallet — the user stores the keys themselves; custodial — the service takes custody upon itself; multisig — increases the security of large business operations; hardware and mobile — for offline storage and mobile actions. The choice of platform determines the architecture: The web version is suitable for fast integration. Mobile applications are used on Android and iOS operating systems. Telegram Mini Apps are focused on fast launch in the mass market. Browser extensions are in demand among power users. The right choice of type and platform makes it possible to immediately lay the foundation for security and ease of use. When deciding how to build a cryptocurrency wallet, pay attention to the structure of the future application. Popular today are: Structure Type Advantages Monolithic architectures Everything works “under one roof,” and application maintenance is easier. Microservices Separate modules interact via API and make it possible to scale solutions. When choosing an architecture, it is important not to forget about key security. Main practices of 2025 that will continue to be implemented in 2026: hardware-level key storage; implementation of biometrics (Face/Touch ID); backup phrases (seed phrase), phishing protection; integration of DID/SSI for decentralized identification. A well-designed architecture minimizes the risks of losing access and helps comply with regulatory requirements. A modern technology stack speeds up launch and expands the capabilities of the finished product. Development uses a flexible stack of tools selected depending on the needs, scale of the project, and the specifics of the target blockchains: 1. Web3.js and Ethers.js — the main libraries for JavaScript/TypeScript that enable work with the Ethereum blockchain and all compatible EVM-based networks (Ethereum Virtual Machine), such as Binance Smart Chain, Polygon, Avalanche, and others. Using Web3.js makes it possible to connect smart contracts, sign and send transactions, track events, and interact with decentralized applications directly from the wallet’s user interface. With Web3.js, it is possible to implement an NFT purchase function on the Polygon network, while Ethers.js scales easily when building custom solutions with many tokens. 2. WalletConnect 2.0 — a universal protocol that provides a secure connection between mobile and desktop wallets and decentralized applications and DeFi platforms. Integration of WalletConnect 2.0 allows the wallet user to sign transactions in any DApp without manually copying a seed phrase or private key. Through WalletConnect, it is possible to instantly connect a mobile wallet to the web application of an NFT marketplace and carry out swap or sale operations for digital assets in just a couple of clicks. 3. Solana Web3.js — a specialized library for fast and low-cost work with the Solana blockchain, which is popular due to its high speed, low fees, and support for scalable NFT and DeFi applications. It makes it possible to implement instant payments, SPL token mint and transfer, custom logic for Launchpad, or fast interaction with NFT games. In gaming wallets, Solana Web3.js is often used for instant reward distribution and NFT item exchange without delays. 4. TON SDK is necessary when integrating wallets and applications with the Telegram Open Network (TON), which is becoming increasingly in demand for mini apps in messengers, fast transfers, and token issuance (for example, Jettons). Such SDKs make it possible to implement wallets, instant transfers, and DApp integrations in TON Space. 5. TronWeb — a library for the Tron blockchain, popular among Asian and gaming projects due to fast transactions and low fees. With TronWeb, gaming projects and DeFi on Tron are supported with minimal delays and high transaction volumes. 6. Account Abstraction and the new ERC-4337 standard — technologies for flexible account management in Ethereum and EVM that make it possible to create smart-account wallets without the need to manage private keys in the traditional way. Using Account Abstraction, it is possible to develop a wallet in which access can be restored through a trusted device or a multi-step identity verification process. This is important for corporate clients and DeFi applications. 7. React Native and Flutter — the main frameworks for cross-platform mobile development of modern wallets and blockchain applications. React Native makes it possible to quickly create convenient interfaces for iOS and Android from a single codebase and easily integrates push notifications, biometric authentication, and QR scanners. Flutter stands out for high performance, versatility, and fast rendering of complex graphics, which is critical for wallets with NFT galleries. With React Native, it is possible to build a DeFi Wallet for instant swaps. And with Flutter — an NFT wallet with collection display and integration with Google Pay/Apple Pay. It is important to evaluate whether to use open-source libraries or build everything from scratch. Open solutions provide access to the global community and reduce costs, but require separate security work. By comparing frameworks, a developer simplifies DeFi and NFT integration and increases launch speed. Top Features of a Cryptocurrency Wallet — Security, Multichain, and Convenience No modern wallet can do without this feature set. In 2025–2026, users expect: multi-currency and multichain support; sending/receiving tokens of all formats (ERC-20, BEP-20, NFT, SBT); built-in support for DeFi and staking platforms; an NFT gallery; an exchange and cross-chain swaps; Web3 login, SSO, DID; QR codes for P2P payments; biometric protection; AI anti-fraud, privacy, and encryption. EXAMPLES: In the FreeMoon project developed by Freeblock, convenient token migration operations, tools for working with the token through popular wallets, and the development of custom contracts for token updates were implemented. This is a UI/UX solution with an emphasis on presentation and wallet interaction for token projects. It draws attention to usability and new holders. In another company product — Crocobit Extension, there is a universal browser extension for asset management, wallet generation inside the extension, sending and receiving cryptocurrencies across various blockchains, crypto swaps within the interface, user-controlled private key management, and multi-account support. The more functional the wallet, the higher the user interest and retention rate. A convenient wallet not only works fast but also looks appealing. Professionals recommend implementing: simple onboarding; interface customization; support for mobile platforms and Telegram Mini Apps; gamification — visual rewards, achievement checklists; dark and light themes. Aesthetics, adaptation, and thoughtful design solve the task of attracting and retaining an audience. Security plays the main role in the stable operation of the application and in maintaining its reputation. Before launch, the developer implements: Mandatory KYC/AML and KYT practices. Security certificates. Smart contract audit. AI for transaction monitoring. New wallets use AI analysis to automatically detect suspicious operations and instantly warn the user. Step-by-step checklist: conduct market research and audit user needs choose the wallet type and architecture select the best technology stack implement the core features test protection and security obtain a license if necessary prepare a promotion strategy launch and support product development By following this checklist, a developer accelerates time to market without sacrificing quality. Demand for innovative wallets is growing continuously. Every year, new protocols, tokens, and DApp ecosystems emerge. The right architecture and feature set make it possible to take leading positions in the market, while a competent security implementation will protect user assets. Get your first consultation, MVP, or wallet audit and create a product that meets the requirements of the future.