We architect and deploy the foundational logic for your dApp. Our contracts are built for security, scalability, and long-term maintainability, using battle-tested standards like ERC-20, ERC-721, and custom Solidity 0.8+ architectures.
LABS
Services
EVM Debit Card Gateway Development
We build custom smart contract gateways and APIs that connect your EVM-based wallets and DeFi protocols directly to card issuance networks, enabling seamless crypto-to-fiat conversion at point-of-sale.
Chainscore © 2026
overview
CORE INFRASTRUCTURE
Smart Contract Development
Secure, production-ready smart contracts built on audited, gas-optimized code.
- Security-First Development: Every line follows OpenZeppelin patterns and undergoes internal review before formal audit.
- Gas Optimization: We reduce user transaction costs by 15-40% through efficient storage and computation patterns.
- Full Lifecycle Support: From initial spec to mainnet deployment and post-launch upgrade management via transparent proxies.
Deliver a secure, auditable, and cost-effective contract suite in as little as 2-4 weeks for an MVP.
key-features-cards
ENTERPRISE-READY INFRASTRUCTURE
Core Gateway Capabilities We Deliver
We architect and deploy the complete technical foundation for your EVM debit card program, from secure smart contracts to compliant payment rails. Focus on your product vision while we handle the complex infrastructure.
01
Smart Contract Gateway
Secure, gas-optimized Solidity contracts for card issuance, balance management, and transaction authorization. Built with OpenZeppelin standards and audited by leading security firms.
OpenZeppelin
Security Standard
Full Audit
Guarantee
02
Real-Time On-Chain Settlement
Direct integration with EVM chains for instant balance top-ups and transaction settlement. Supports multi-chain deployments (Ethereum, Polygon, Arbitrum, Base) with sub-2-second finality.
< 2 sec
Settlement Time
Multi-Chain
Support
03
Compliant Card Program Management
White-label dashboard for KYC/AML checks, cardholder onboarding, spending limits, and transaction monitoring. Pre-integrated with leading compliance providers.
PCI DSS
Compliant
KYC/AML
Integrated
04
Payment Processor Integration
Seamless connection to global payment networks (Visa/Mastercard rails) and fiat on/off-ramps. Handles currency conversion, authorization, and clearing.
Visa/Mastercard
Network Ready
Global
Coverage
05
High-Availability API Layer
RESTful and WebSocket APIs for balance queries, transaction history, and card controls. Built for scale with 99.9% uptime SLA and enterprise-grade monitoring.
99.9%
Uptime SLA
REST/WS
API Types
06
Custom Reward & Loyalty Engine
Programmable incentive systems for cashback, staking rewards, and partner offers. Deploy custom ERC-20 reward tokens and automated distribution logic.
ERC-20
Reward Standard
Automated
Distribution
benefits
DELIVERABLES & METRICS
Business Outcomes for Your FinTech or NeoBank
Our EVM Debit Card Gateway delivers measurable infrastructure improvements that directly impact your bottom line and user experience.
01
Faster Time-to-Market
Deploy a fully integrated, compliant EVM debit card solution in under 4 weeks, not months. We provide pre-audited smart contracts, KYC/AML modules, and card processor APIs.
< 4 weeks
Deployment Time
Pre-audited
Smart Contracts
02
Reduced Operational Cost
Eliminate the overhead of building and maintaining complex on/off-ramp infrastructure. Our gateway handles gas optimization, fraud monitoring, and settlement reconciliation.
60-80%
Dev Cost Savings
Automated
Settlement
03
Enhanced Security & Compliance
Leverage battle-tested smart contracts with formal verification and integrate with leading KYC providers (Sumsub, Onfido) for a fully compliant card program from day one.
Formally Verified
Core Logic
PCI DSS Level 1
Partner Compliance
04
Superior User Experience
Offer instant card issuance, sub-second transaction authorization, and real-time fiat/crypto balance visibility—matching the UX of traditional neo-banks.
< 1 sec
Auth Time
Instant
Card Issuance
05
Scalable Transaction Throughput
Architected for high volume. Our gateway handles thousands of transactions per second with 99.95% uptime SLA, supporting your growth from launch to global scale.
99.95%
Uptime SLA
1000+ TPS
Designed Capacity
06
Seamless Multi-Chain Support
Deploy once, support everywhere. Our gateway is chain-agnostic, enabling debit card spending from user wallets on Ethereum, Polygon, Arbitrum, and other EVM-compatible L2s.
EVM Native
Architecture
10+ Chains
Supported
Structured for predictable delivery and cost
Phased Development Tiers
Our modular approach to EVM debit card gateway development allows you to start with core functionality and scale with confidence. Each tier includes all features from the previous level.
| Core Capabilities | Launch Tier | Scale Tier | Enterprise Tier |
|---|---|---|---|
EVM Smart Contract Suite (ERC-20, Card Manager) | |||
On-Chain Authorization & Settlement Engine | |||
Basic Card Issuance Dashboard | |||
Integration with 1 Card Processor | |||
Multi-Chain Support (Polygon, Arbitrum, Base) | |||
Advanced Fraud & Risk Dashboard | |||
Gas Optimization & Relayer Service | |||
Custom Rewards & Loyalty Module | |||
White-Label Mobile SDK | |||
Smart Contract Audit & Certification | Basic Review | Full Audit + Report | Full Audit + Ongoing Monitoring |
Deployment & Integration Support | Documentation | Hands-on Assistance | Dedicated Engineer |
Support SLA & Response Time | Business Hours / 48h | 16/5 / 24h | 24/7 / 4h |
Estimated Timeline | 4-6 weeks | 8-12 weeks | 12+ weeks |
Starting Project Cost | $25,000 | $75,000 | Custom Quote |
how-we-deliver
PROVEN METHODOLOGY
Our Development & Integration Process
A structured, transparent approach to delivering a secure, compliant, and scalable EVM debit card gateway. We focus on rapid integration and measurable outcomes.
01
Discovery & Architecture Design
We conduct a technical deep-dive to define your specific requirements, from token support to compliance rules. We deliver a detailed system architecture and integration roadmap, ensuring alignment with your business goals from day one.
1-2 weeks
Project Kickoff
Detailed Roadmap
Deliverable
02
Smart Contract Development & Audit
Our engineers build custom, gas-optimized smart contracts for card issuance, transaction routing, and fee management. All code is developed with OpenZeppelin standards and undergoes a mandatory internal security review before deployment.
OpenZeppelin
Security Standard
Internal Audit
Mandatory Step
03
Gateway Core Integration
We integrate our battle-tested gateway middleware with your existing wallet infrastructure and payment processors. This includes implementing secure APIs for balance checks, transaction authorization, and real-time settlement on-chain.
REST & WebSocket
API Support
< 100ms
Auth Latency
05
Staging Deployment & Testing
Full deployment to a staging environment mirroring production. We execute comprehensive test suites including load testing, security penetration tests, and end-to-end user flow simulations to ensure reliability.
> 1000 TPS
Load Test Target
Pen Test
Security Validation
06
Production Launch & Monitoring
Managed go-live with 24/7 monitoring dashboards for transaction volume, success rates, and system health. We provide detailed documentation and ongoing support SLAs to ensure operational excellence post-launch.
99.9%
Uptime SLA
24/7 Dashboards
Live Monitoring
security
CORE SERVICE
Smart Contract Development
Secure, audited smart contract development for DeFi, NFTs, and enterprise applications.
We build production-ready Solidity and Rust smart contracts with a focus on security, gas efficiency, and upgradability. Our process includes formal verification and integration with OpenZeppelin libraries to mitigate risks.
- Custom Logic: DeFi protocols (DEX/AMM, lending/borrowing), NFT collections (ERC-721A/1155), and enterprise utilities.
- Full Audit Trail: Multi-stage review, automated testing with
Hardhat/Foundry, and third-party audit coordination. - Deployment & Management: Mainnet deployment with verified source code, proxy patterns for upgrades, and ongoing monitoring.
Deliver a secure, audited MVP in as little as 4 weeks, backed by our team's experience deploying over 200+ contracts on Ethereum, Polygon, and Solana.
EVM Debit Card Gateway
Frequently Asked Questions
Common questions from CTOs and founders about developing a secure, compliant debit card gateway for EVM-based assets.
A production-ready MVP with core features (card issuance, top-up, spend, balance check) typically deploys in 4-6 weeks. Complex integrations with multiple card processors, advanced KYC/AML modules, or custom reward logic can extend this to 8-12 weeks. Our agile sprints deliver a testnet prototype within the first 2 weeks.
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