We architect and deploy custom smart contracts that are secure, gas-optimized, and ready for mainnet. Our engineers specialize in Solidity, Rust (Solana), and Vyper to deliver contracts for tokens (ERC-20, ERC-721), DeFi protocols, DAOs, and NFT projects.
LABS
Services
Paymaster Smart Contract Security Audit
Specialized security audits and formal verification for paymaster contracts and sponsorship logic. We focus on economic security, replay attacks, and fund management vulnerabilities to protect your users and treasury.
Chainscore © 2026
overview
CORE SERVICE
Smart Contract Development
Secure, production-ready smart contracts built by Web3-native engineers.
Every contract undergoes a rigorous security process, including internal audits and integration with tools like Slither and MythX, before we recommend third-party audits from firms like CertiK or Quantstamp.
- Full Development Lifecycle: From specification and architecture to deployment, verification, and post-launch monitoring.
- Security-First Approach: Adherence to OpenZeppelin standards and best practices to mitigate reentrancy, overflow, and logic flaws.
- Gas Optimization: We analyze and refine code to reduce transaction costs by 15-40%, critical for user adoption.
- Comprehensive Testing: Unit, integration, and scenario testing using
HardhatorFoundryto ensure reliability.
key-features-cards
COMPREHENSIVE SECURITY REVIEW
What Our Paymaster Audit Covers
Our audit methodology is designed for the unique complexities of paymaster smart contracts, focusing on the critical logic that manages gas sponsorship and user operations. We deliver actionable findings to secure your infrastructure and user funds.
01
Gas Abstraction Logic
We meticulously audit the core logic for sponsoring transaction fees, including validation of user operations, gas price calculations, and refund mechanisms to prevent economic attacks and ensure protocol solvency.
100%
Line Coverage
ERC-4337
Standard
02
EntryPoint Integration
In-depth review of your contract's interaction with the ERC-4337 EntryPoint, ensuring correct handling of validatePaymasterUserOp, postOp, and proper signature verification to prevent replay and front-running attacks.
Zero
Critical Bugs
AA-Compliant
Guarantee
03
Deposit & Withdrawal Security
Security assessment of fund management functions, verifying safe deposit handling, secure withdrawal patterns, and protection against reentrancy and integer overflow/underflow vulnerabilities.
OpenZeppelin
Libraries
Formal Verification
Applied
04
Access Control & Administration
Review of administrative functions, ownership transfer mechanisms, and role-based permissions to prevent unauthorized access to critical operations like pausing the contract or updating fee parameters.
Multi-Sig
Recommendation
Timelock
Patterns
05
Upgradeability & Proxy Patterns
If applicable, we audit the implementation of upgradeable proxies (UUPS/Transparent), checking for storage collisions, initialization vulnerabilities, and secure upgrade paths to maintain contract integrity.
EIP-1967
Compliance
Storage Layout
Verified
06
Economic & Gas Optimization
Analysis of the paymaster's economic model and gas efficiency. We identify optimization opportunities in validation logic and storage usage to reduce operational costs for your users and your business.
Up to 40%
Gas Savings
Benchmarked
Against Standards
benefits
BEYOND STANDARD SECURITY
Why a Specialized Paymaster Audit is Critical
Generic smart contract audits miss the unique risks of paymaster systems. Our specialized audit focuses on the financial logic, gas abstraction, and user experience vulnerabilities that can lead to catastrophic losses.
02
Sponsorship Policy & Access Control
We verify that only authorized users and operations can be sponsored. Missing checks can turn your paymaster into a free gas faucet for malicious actors. We enforce strict whitelists, rate limits, and spending caps.
03
Token Payment & Refund Vulnerabilities
For pay-for-gas tokens, we audit price oracles, exchange rate logic, and refund mechanisms. Flaws here can lead to incorrect token deductions, arbitrage losses, or failed transactions that erode user trust.
04
Integration with EntryPoint & Bundlers
We test the full interaction flow with ERC-4337's EntryPoint and bundlers. Misalignment can cause transactions to revert, user ops to be dropped, or sponsorship to fail silently, breaking your core user experience.
05
Economic Model & Sustainability
We analyze your fee structure, subsidy model, and replenishment logic. An unsustainable model can deplete funds, while incorrect calculations can make your service unprofitable or vulnerable to economic attacks.
06
Upgradeability & Admin Key Risks
We review upgrade mechanisms and admin privileges specific to paymaster contracts. A compromised admin key or flawed upgrade can lead to total fund loss. We recommend and audit secure, timelocked governance patterns.
Choose Your Audit Package
Audit Scope & Deliverables
Our structured audit packages are designed to match the security needs and budget of any project, from early-stage startups to established enterprises.
| Audit Feature | Starter | Professional | Enterprise |
|---|---|---|---|
Smart Contract Code Review | |||
Gas Optimization Analysis | |||
Formal Verification | |||
Third-Party Dependency Audit | |||
Deployment & Integration Support | |||
Post-Audit Remediation Review | |||
24/7 Monitoring & Alerting | |||
Emergency Response Time | N/A | 48 hours | 4 hours |
Final Deliverables | Audit Report | Report + Remediation Plan | Report + Plan + Ongoing Support |
Typical Timeline | 1-2 weeks | 2-3 weeks | 3-4 weeks |
Starting Price | $5,000 | $15,000 | Custom Quote |
process-walkthrough
FULL-STACK INFRASTRUCTURE
Custom Blockchain Development
Build, deploy, and scale purpose-built blockchain solutions tailored to your business logic.
We architect and implement custom blockchain networks, sidechains, and L2 solutions from the ground up. Our team delivers production-ready infrastructure with 99.9% uptime SLAs, designed for your specific throughput, privacy, and consensus requirements.
From a 2-week proof-of-concept to a fully audited mainnet launch, we manage the entire lifecycle.
Core Deliverables:
- Custom Chain Design: Private, consortium, or public networks using
Substrate,Cosmos SDK, orEVM-compatible frameworks. - Node Infrastructure: Automated deployment, monitoring, and governance tooling.
- Cross-Chain Bridges: Secure, audited interoperability with major networks like Ethereum, Solana, and Polygon.
- Full Documentation & Handoff: Complete technical specs and operational runbooks for your team.
Smart Contract Security
Paymaster Audit FAQs
Get clear answers about our comprehensive security audit process for Paymaster smart contracts. We address the most common questions from CTOs and technical leads.
We employ a rigorous, multi-layered methodology: 1. Automated Analysis using Slither and Foundry fuzzing to detect common vulnerabilities. 2. Manual Code Review by senior auditors focusing on gas optimization, reentrancy, and logic flaws specific to gas abstraction. 3. Threat Modeling to analyze potential attack vectors like relay manipulation and signature replay. 4. Formal Verification for critical state transitions. This process has secured over $500M in TVL across 50+ Web3 projects.
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