We architect and deploy custom smart contracts on EVM and Solana that are secure, gas-optimized, and ready for mainnet. Our code is built with Solidity 0.8+ or Rust, leveraging audited libraries like OpenZeppelin and Anchor.
LABS
Services
DeFi Yield-Backed Card Services
We design and implement card programs where user spending power is directly backed by yield from staking, liquidity pools, and other DeFi positions. Users spend interest, not principal.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built by expert auditors.
Reduce your time-to-audit by 50% with battle-tested patterns and comprehensive documentation.
- Security-First Development: Every line is written with audit-readiness in mind, following
SWCandSlithersecurity patterns. - Full Lifecycle Support: From initial design and
Hardhat/Foundrytesting to deployment and upgrade management viaProxypatterns. - Measurable Outcomes: Achieve 99.9% test coverage, 30-40% gas optimization, and a clear path to audits from firms like
CertiKorTrail of Bits.
key-features-cards
ENGINEERED FOR SCALE
Core Technical Capabilities
Our DeFi yield-backed card infrastructure is built on a foundation of enterprise-grade security, interoperability, and performance. We deliver the technical depth required for high-volume financial products.
01
Smart Contract Architecture
Secure, gas-optimized smart contracts for yield vaults, card issuance, and on-chain settlement. Built with Solidity 0.8+ and OpenZeppelin libraries, following industry best practices for reentrancy and access control.
100%
Coverage Audits
ERC-4626
Vault Standard
02
Multi-Chain Yield Aggregation
Automated yield sourcing and strategy execution across Ethereum, Polygon, and Arbitrum. Our system dynamically allocates capital to optimize APY while managing risk and gas costs.
5+
Supported Chains
< 24h
Strategy Updates
03
Real-Time Card Issuance API
RESTful API for instant virtual and physical card provisioning. Integrates with card processors to link on-chain yield wallets to spendable fiat lines in seconds.
< 2 sec
Issuance Time
99.9%
API Uptime
04
Compliance & Security Engine
On-chain monitoring and transaction screening integrated with AML providers. Automated compliance checks for card transactions and yield withdrawals to meet regulatory requirements.
24/7
Monitoring
SOC 2
Framework
05
Scalable Backend Infrastructure
Event-driven microservices architecture for processing yield, settlements, and user data. Built for high throughput with horizontal scaling and 99.9% SLA on core services.
10k+
TPS Capacity
< 100ms
P95 Latency
06
White-Label Dashboard & SDK
Fully customizable admin dashboard and frontend SDK for partners. Monitor treasury health, user activity, and yield performance with real-time analytics and reporting tools.
2 weeks
Integration Time
Custom
Branding
benefits
DELIVERABLES
Business Outcomes for Your Platform
Our DeFi yield-backed card service delivers measurable infrastructure improvements, enabling you to launch a competitive product with enterprise-grade reliability.
01
Rapid Time-to-Market
Launch a fully functional, white-labeled card program in under 6 weeks. We handle the complex integration of yield-bearing wallets, card issuance, and compliance rails, so your team can focus on core product development.
< 6 weeks
Launch Timeline
Pre-built
Compliance Module
02
Enterprise-Grade Security & Compliance
Deploy with confidence using our battle-tested smart contract architecture, audited by leading security firms. Our infrastructure includes built-in AML/KYC checks and secure MPC wallet custody, ensuring regulatory readiness from day one.
Certik
Security Audit
MPC
Wallet Custody
03
Optimized Yield Engine
Maximize user rewards with our automated yield aggregation across vetted DeFi protocols (Aave, Compound, Lido). Our system dynamically allocates capital for optimal risk-adjusted returns, a key feature for user acquisition and retention.
Multi-Protocol
Yield Sources
Dynamic
Allocation
04
Seamless Fiat On/Off Ramps
Provide a smooth user experience with integrated, low-fee fiat gateways. We connect to major payment processors for card funding and withdrawals, abstracting blockchain complexity for your end-users.
< 2%
Processing Fee
Global
Support
05
Scalable Transaction Infrastructure
Support high-volume card transactions with our low-latency, multi-chain settlement layer. Achieve sub-second authorization times and 99.9% uptime, matching the performance expectations of traditional payment networks.
99.9%
Uptime SLA
< 1 sec
Auth Time
Structured Roadmap to Launch
Phased Development & Integration
A modular, milestone-driven approach to building and integrating your DeFi yield-backed card service, from initial MVP to enterprise-grade deployment.
| Phase & Deliverables | Foundation | Growth | Scale |
|---|---|---|---|
Smart Contract Suite (Core Vaults & Cards) | |||
Basic Frontend Dashboard | |||
Multi-Chain Yield Aggregation (Ethereum, Polygon) | |||
Advanced Risk Management Module | |||
KYC/AML Integration Layer | |||
Real-Time Yield Analytics & Reporting | |||
Custom Card Issuer API & White-label SDK | |||
Smart Contract Audit (by Spearbit/Code4rena) | Optional Add-on | Included | Included + Continuous |
Deployment & Go-Live Support | Self-Serve | Guided | Managed |
Ongoing Maintenance & 24/7 Monitoring SLA | Optional | 99.9% Uptime SLA | |
Estimated Timeline | 6-8 Weeks | 10-14 Weeks | 16+ Weeks |
Starting Engagement | $50K | $150K | Custom Quote |
how-we-deliver
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built by Web3 experts to power your protocol.
We architect and deploy custom smart contracts for DeFi, NFTs, and enterprise applications. Our code is built on Solidity 0.8+ with OpenZeppelin security patterns, delivering audit-ready contracts in as little as 2-4 weeks.
- Token Systems: Custom
ERC-20,ERC-721, andERC-1155with minting, vesting, and governance modules. - DeFi Protocols: Automated Market Makers (AMMs), staking pools, and yield aggregators with gas-optimized logic.
- Enterprise Logic: Multi-signature wallets, supply chain tracking, and verifiable credential systems.
- Full Audit Support: We prepare contracts for formal review by top firms like CertiK and Trail of Bits.
We guarantee zero critical vulnerabilities in our delivered code, backed by our internal security review process. Your contracts are built for mainnet deployment from day one.
tech-stack
BUILT ON PROVEN INFRASTRUCTURE
Technology & Protocol Expertise
Our DeFi yield-backed card services are engineered on battle-tested protocols and audited smart contracts, ensuring security, scalability, and seamless integration for your financial product.
DeFi Yield-Backed Card Services
Frequently Asked Questions
Get clear answers about our process, security, and timelines for building a card program powered by on-chain yield.
Our engagement follows a structured 4-phase process: 1) Discovery & Architecture (1 week): We map your requirements, tokenomics, and target chains. 2) Smart Contract Development (2-3 weeks): We build and audit the core yield aggregation, collateral management, and card-spend logic. 3) Card Issuer & Processor Integration (2-3 weeks): We integrate with card networks (Visa/Mastercard rails) and banking partners via secure APIs. 4) Deployment & Launch Support (1 week): We handle mainnet deployment, provide documentation, and support your go-to-market. We assign a dedicated technical lead and provide weekly sprint reviews.
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