We architect and deploy custom Solidity/Rust smart contracts that are secure by design. Every contract undergoes formal verification and peer review before deployment to mainnet.
LABS
Services
NEAR Protocol BOS Widget for Real-Time Tax Estimation
A custom-built, embeddable front-end component for the NEAR Blockchain Operating System (BOS) that calculates and displays instant, location-based tax estimates before transaction confirmation, ensuring full transparency for users and merchants.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built for your specific business logic.
- Full Lifecycle Support: From initial specification and
OpenZeppelinintegration to deployment and post-launch monitoring. - Audit-Ready Code: We follow industry-standard patterns, producing code that passes security audits from firms like ConsenSys Diligence and Quantstamp.
- Gas Optimization: Our contracts are engineered for up to 40% lower gas costs, directly impacting your users' transaction fees.
We deliver battle-tested contracts for DeFi protocols, NFT collections, DAOs, and enterprise applications, ensuring they are reliable, upgradeable, and secure from day one.
key-features-cards
ENTERPRISE-GRADE TAX INFRASTRUCTURE
Core Capabilities of Our BOS Tax Widget
Our widget delivers production-ready, compliant tax estimation directly within your NEAR BOS application, eliminating manual calculations and integration headaches.
benefits
THE CHAINSCORE ADVANTAGE
Business Outcomes: More Trust, Fewer Headaches
Our NEAR BOS widget development delivers more than just code. We build secure, reliable infrastructure that drives user adoption and protects your brand, so you can focus on growth.
01
Proven Security & Compliance
Widgets built with formal verification and security-first architecture. We implement battle-tested patterns and conduct third-party audits to ensure your tax logic is tamper-proof and compliant with financial regulations.
Zero
Critical Vulnerabilities
100%
Code Coverage
02
Seamless User Experience
Real-time tax calculations embedded directly into your dApp's UI. Users see accurate, instant estimates without leaving your platform, reducing friction and increasing transaction completion rates.
< 200ms
Calculation Latency
99.9%
Uptime SLA
03
Rapid Integration & Time-to-Market
Deploy a production-ready, customizable widget in weeks, not months. Our modular BOS components plug directly into your existing NEAR dApp, accelerating your launch schedule.
2-4 weeks
Average Deployment
1 day
Integration Time
04
Scalable & Maintainable Architecture
Future-proof widgets designed for high throughput. We build with upgradeability and multi-chain considerations in mind, ensuring your solution scales with user growth and evolving tax jurisdictions.
10k+
TPS Supported
24/7
Monitoring & Support
Structured delivery for predictable outcomes
Phased Development Tiers
Choose the right engagement model for your NEAR BOS tax widget, from a rapid MVP to a fully managed enterprise solution.
| Feature / Deliverable | Starter (MVP) | Professional (Production) | Enterprise (Managed) |
|---|---|---|---|
Core BOS Widget Development | |||
Smart Contract Audit (1x) | |||
Integration with 1 Tax API | CoinGecko | CoinGecko + CoinMarketCap | Custom API Integration |
Multi-Chain Support | NEAR Only | NEAR + 2 EVM Chains | NEAR + 5+ EVM Chains |
UI/UX Customization | Standard Template | Custom Branding | Full Custom Design System |
Deployment & Testing Support | Mainnet Deployment | Testnet + Mainnet | Staging, Testnet, Mainnet |
Post-Launch Support | 30 Days | 90 Days | 12-Month SLA |
Response Time SLA | Business Hours | 12 Hours | 4 Hours |
Performance Monitoring | Basic Alerts | Advanced Dashboard | 24/7 Proactive Monitoring |
Estimated Timeline | 2-3 Weeks | 4-6 Weeks | 8-12 Weeks |
Starting Price | $15,000 | $45,000 | Custom Quote |
how-we-deliver
PROVEN METHODOLOGY
Our Development & Integration Process
A structured, security-first approach to building and deploying your real-time tax widget. We ensure rapid delivery, robust security, and seamless integration with your existing NEAR dApp.
01
Discovery & Architecture Design
We analyze your dApp's transaction flows and user journey to architect a tax estimation model that is accurate, performant, and non-intrusive. This phase defines the data schema, widget placement, and integration points.
1-2 days
Workshop
100%
Requirement Lock
02
Smart Contract & Logic Development
Our certified Solidity/Rust developers build the core tax calculation engine and any necessary on-chain components. All code follows OpenZeppelin standards and is optimized for gas efficiency on NEAR.
OpenZeppelin
Standards
Gas-Optimized
Code
03
BOS Widget UI/UX Implementation
We develop the frontend widget using the NEAR BOS framework, ensuring a responsive, intuitive interface that matches your brand. The widget fetches and displays real-time tax estimates without disrupting the user experience.
< 100ms
Load Time
Fully Custom
Styling
04
Security Audit & Penetration Testing
Every component undergoes rigorous internal review and optional third-party audit. We test for financial logic flaws, frontend vulnerabilities, and data integrity to protect your users and your protocol.
Multi-Layer
Security
Audit Ready
Deliverables
05
Staging Deployment & Integration Testing
We deploy the complete solution to a testnet/staging environment. This phase includes end-to-end integration testing with your dApp, user acceptance testing (UAT), and performance benchmarking.
Testnet
Environment
Full E2E
Test Suite
06
Production Launch & Ongoing Support
We manage the mainnet deployment, provide documentation, and offer ongoing maintenance and support packages. This includes monitoring, updates for tax law changes, and scalability optimizations.
99.9% SLA
Uptime
24/7
Monitoring
NEAR BOS Widget Development
Frequently Asked Questions
Get clear answers on our process, timeline, and technical approach for building real-time tax estimation widgets on the NEAR Blockchain Operating System.
Our engagement follows a structured 4-phase methodology: 1) Discovery & API Integration - We analyze your tax logic and integrate with your chosen data source (e.g., CoinGecko, CoinMarketCap). 2) Widget Architecture - We design the UI/UX and smart contract logic for the BOS component. 3) Development & Testing - We build the widget with unit and integration testing, including simulated tax scenarios. 4) Deployment & Handoff - We deploy to BOS and provide full documentation. We maintain weekly sprint reviews and use Jira for transparent project tracking.
ENQUIRY
Get In Touch
today.
Our experts will offer a free quote and a 30min call to discuss your project.
NDA Protected
Confidentiality24h Response
Time to ValueDirectly to Engineering Team
No Sales Fluff10+
Protocols Shipped
$20M+
TVL Overall