Privacy-Preserving Recurring Transaction Systems

Develop custom Solidity 0.8+ contracts with OpenZeppelin libraries. Our patterns for recurring logic reduce gas costs by up to 40% versus naive implementations, with full NatSpec documentation.

Deliver systems audited by leading firms like Trail of Bits or Quantstamp. Our development includes comprehensive unit/integration testing, formal verification where applicable, and penetration testing reports.

Deploy systems with built-in compliance for AML/KYC and data privacy regulations (e.g., GDPR). Our modular design integrates with identity verification providers, enabling automated compliance workflows without exposing sensitive user data on-chain.

Implement seamless, non-custodial subscription flows. Users authorize recurring payments once via smart contracts, eliminating manual renewals and failed transactions. This directly improves customer lifetime value (LTV) and reduces churn.

Receive production-ready smart contracts and backend systems that have undergone rigorous security audits. We provide formal verification reports and continuous monitoring to protect your treasury and user funds from exploits.

Launch your service across Ethereum, Polygon, Arbitrum, and other EVM-compatible chains from a single codebase. Our architecture abstracts chain complexity, ensuring consistent user experience and operational efficiency as you scale.

Automate billing, reconciliation, and reporting with on-chain settlement. Eliminate manual backend processes and intermediary fees associated with traditional payment processors, significantly lowering your cost per transaction.

Leverage our battle-tested, modular frameworks for privacy-preserving transactions. Go from concept to mainnet in weeks, not months, with dedicated engineering teams experienced in DeFi, NFTs, and real-world asset tokenization.

We analyze your business logic to design a system architecture that balances privacy, cost, and performance. This includes selecting the optimal cryptographic primitives (zk-SNARKs, zk-STARKs, TEEs) and blockchain layer for your use case.

Our engineers develop and rigorously test the core on-chain logic and zero-knowledge circuits. We implement gas-optimized Solidity/Vyper contracts and auditable zk circuits using Circom or Noir.

Every component undergoes internal review followed by a third-party audit from firms like Spearbit or Code4rena. Critical circuits receive formal verification to mathematically prove correctness.

We build the off-chain relayers, key management services, and REST/WebSocket APIs that securely connect your existing application to the new privacy layer, handling proof generation and transaction submission.

We deploy the complete system to a staging environment matching mainnet conditions. We conduct load tests simulating thousands of concurrent recurring transactions to validate scalability and gas cost projections.

We manage the phased mainnet rollout with monitoring and incident response. Post-launch, we provide SLA-backed support, performance analytics dashboards, and upgrade planning for protocol changes.