OpenZeppelin
OpenZeppelin provides smart contract security infrastructure — including the industry-standard Contracts Library, Defender cloud platform, AI Auditor, and elite audit services — for DeFi protocols, blockchain networks, and financial institutions managing onchain assets.
- Company typePrivate
- Founded2015
- HeadquartersSan Francisco, Spain
- Headcount11–50
- GTM typeB2B
- OfferingSoftware
What OpenZeppelin does
OpenZeppelin, legally Zeppelin Group Ltd (incorporated in England and Wales, 2015), is the dominant smart contract security and infrastructure provider for onchain finance. The company builds and maintains the OpenZeppelin Contracts Library — the industry-standard, battle-tested smart contract library for Solidity and Cairo that underpins 9 of the top 10 stablecoins, 10 of the top 10 tokenized money-market funds, and over $31 trillion in cumulative transfer value. Its technology stack spans developer tools (Contracts Wizard, Upgrades Plugins, Relayer, Monitor, UI Builder, Safe Utils, Access Control), the Defender cloud platform for onchain operations, and a set of open-source Daml verification tools (daml-lint, daml-props, daml-verify) for the Canton Network.
The company monetizes across three streams: (1) professional services security audits — Smart Contract Audits, ZKP Audits, and Blockchain Infrastructure Audits — priced at approximately $25,000 per engineer-week for top-tier engagements; (2) subscription-based recurring revenue from the Continuous Security Program (an always-on model covering Architect, Build, Secure, and Support lifecycle phases with reserved researcher capacity) and Defender cloud subscriptions; and (3) commercial licensing for AGPL-licensed enterprise tools. Its customer base spans DeFi protocols (Aave, Uniswap, Compound, 1inch, Synthetix, Morpho, UMA), Layer 2 and blockchain infrastructure (ZKsync, Optimism, Scroll, Arbitrum, The Graph, Ethereum Foundation, Mantle, AvaLabs), and traditional financial institutions (Fidelity Digital Assets, DTCC, BitGo, WisdomTree).
OpenZeppelin has conducted 900+ audits identifying 10,000+ vulnerabilities (700+ critical/high), secured over $250 billion in onchain value, and reports a 95% client rehire rate. Its go-to-market combines product-led growth through free open-source tools with enterprise field sales for institutional engagements. In 2025-2026 the company launched the AI Auditor (trained on its proprietary vulnerability corpus), Contracts MCP and Contracts Skills (AI-agent development tooling), and the Continuous Security Program subscription, marking a strategic shift from point-in-time professional services toward AI-augmented, recurring platform revenue.
OpenZeppelin firmographics
Firmographics- Name
- OpenZeppelin
- Legal name
- Zeppelin Group Ltd
- Website
- https://openzeppelin.com
- Company type
- Private
- Founded year
- 2015
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- OpenZeppelin provides smart contract security infrastructure — including the industry-standard Contracts Library, Defender cloud platform, AI Auditor, and elite audit services — for DeFi protocols, blockchain networks, and financial institutions managing onchain assets.
- Ownership category
- akta.pro rank
OpenZeppelin industry classification
Industry- Product category
- Blockchain Smart Contract Security
- NAICS
- Security Systems Services (except Locksmiths) (561621)
- akta.pro primary industry
- Smart Contract Auditing & Formal Verification (FSAPAJAA)
- akta.pro secondary industry
- Smart Contract Frameworks & SDKs (developer kits, templates, standards) (FSAPABAB)
Keywords
Where OpenZeppelin is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- Spain
- HQ region
- Europe
Offices1 record
Markets served
OpenZeppelin business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure
Revenue model
- Continuous Security Program Subscriptions: Subscription-based engagement model providing always-on security coverage across the full development lifecycle. Includes reserved researcher capacity and priority access. Senior security researchers lead every engagement with AI-augmented analysis.
- Security Audits: Professional security audit services including Smart Contract Audits, ZKP Audits, and Blockchain Infrastructure Audits. Conducted by elite researchers with expertise in PhD-level mathematics, cryptography, low-level EVM operations, and finance. Top-tier engagements approximately $25,000 per engineer-week.
- Defender Cloud Services: Subscription-based cloud platform for operating onchain applications. Includes Relayer, Monitor, UI Builder, and Safe Utils. Billed in advance with automatic renewal at end of subscription term.
- Commercial Licensing: Commercial licenses available for AGPL-licensed software (Wizard, Relayer, Monitor, Safe Utils) for enterprises and financial institutions that prefer not to use software under AGPL terms. Contact-based pricing.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| One time/ perpetual license | Multi-year contract | Industry standard audit engagements |
| Subscription | Annual | Defender Cloud Services subscription |
| Subscription | Annual | Continuous Security Program |
Go-to-market motion3 records
Distribution channels4 records
Marketing channels8 records
OpenZeppelin product offering
Product offeringCore offering
OpenZeppelin provides professional security audit services and an open-source development stack for smart contracts powering onchain finance. Its offerings include the industry-standard Contracts Library, the Defender cloud operations platform, the AI-powered AI Auditor, and a Continuous Security Program subscription, complemented by tools covering transaction relaying, monitoring, and Daml verification for institutional Canton Network deployments.
Product overview
OpenZeppelin is a comprehensive platform for developing, securing, and operating onchain financial infrastructure. The portfolio consists of open-source smart contract libraries (Contracts Library, Upgrades Plugins) and developer tools (Contracts Wizard, Relayer, Monitor, UI Builder, Safe Utils, Access Control) forming the core development and operations stack, complemented by AI-powered offerings (AI Auditor, Contracts MCP, Contracts Skills) that extend secure development to AI coding agents. Services include Smart Contract Security Audits, ZKP Audits, Blockchain Infrastructure Audits, and the Continuous Security Program—a subscription engagement model providing always-on coverage. Three open-source Daml verification tools (daml-lint, daml-props, daml-verify) address smart contract security for the Canton Network's Daml-based infrastructure. Over $31 trillion has been transferred through the Contracts ecosystem, with $250 billion in TVL secured across 900+ audits.
Differentiator
Problem solved
Functional benefit
Brands
- OpenZeppelin Contracts: The standard smart contract library for Solidity and Cairo development, battle-tested and widely adopted across the blockchain ecosystem.
- OpenZeppelin Defender
- OpenZeppelin Wizard
- OpenZeppelin Contracts MCP
- OpenZeppelin Upgrades Plugins
- OpenZeppelin Relayer
- OpenZeppelin Monitor
- OpenZeppelin AI Auditor
- daml-lint
- daml-props
- daml-verify
- Ethernaut CTF
- OpenZeppelin Access Control
- OpenZeppelin Safe Utils
- OpenZeppelin UI Builder
Products and services
- OpenZeppelin Contracts Library Industry-standard battle-tested library for smart contract development in Solidity and Cairo, providing secure, reusable components for tokens, governance, access control, and more. Used by 9 of top 10 stablecoins and 10 of top 10 tokenized MMFs.
- Contracts Wizard Interactive web-based tool for generating smart contracts interactively, supporting ERC20, ERC721, ERC1155, and Governor templates with customization options. Targeted at developers building on EVM chains.
- Contracts MCP Model Context Protocol integration that enables AI coding agents to build secure smart contracts with context-aware secure development capabilities. Targeted at developers using AI coding assistants.
- Contracts Skills Open-source library that equips AI agents with secure development skills for smart contract development, available on GitHub. Targeted at AI coding agent workflows.
- Upgrades Plugins Plugins for Foundry and Hardhat that enable secure deployment and management of upgradeable smart contracts with proxy pattern support. Targeted at smart contract developers.
- Relayer Transaction API with secure key storage and transaction management, implementing policies and reliability mechanisms for onchain operations. Has processed over 40 million transactions. Targeted at onchain application teams.
- Monitor Pre-built templates for risk and behavior insights, detecting, alerting, and automatically resolving threats and anomalies in smart contract activity. Has triggered over 45 million monitoring alerts.
- UI Builder Tool for spinning up a user interface for deployed smart contracts, enabling rapid frontend development for onchain applications.
- Safe Utils Security tool for verifying Gnosis Safe transactions before signing, providing transaction safety verification for multisig wallet operations. Targeted at multisig wallet users and treasury managers.
- Access Control Tool for managing contract roles and permissions, providing role-based access control visualization and management for smart contracts.
- Defender Cloud-hosted security platform providing automated transaction execution, monitoring, and security operations for onchain applications. Includes Relayer, Monitor, UI Builder, and Safe Utils. Subscription-based with tiered plans and self-service onboarding.
- OpenZeppelin AI Auditor AI-powered security analysis tool that scales a decade of audit expertise across continuous code coverage. Uses repository-level reasoning to identify vulnerabilities beyond individual functions, with model-agnostic architecture. Targeted at security teams and protocol developers.
- Continuous Security Program Subscription-based engagement model providing always-on security coverage across the full development lifecycle with Architect (design validation), Build (secure foundations), Secure (continuous agent-augmented analysis), and Support (production monitoring) phases. Combines senior security researchers with AI Auditor.
- Smart Contract Security Audits Gold-standard code review services for smart contracts including ZKP audits, with elite researchers uncovering 700+ critical and high vulnerabilities and securing $110 billion in TVL across 900+ audits.
- Blockchain Infrastructure Security Audits Security assessments and audits for offchain infrastructure including Rust execution clients, Go/Geth, Op-Stack forks, zkEVM clients, Cosmos SDK, and custom virtual machines.
- ZKP Audits Security reviews for zero-knowledge proof systems covering circuit security, prover/verifier correctness, and L1/L2 interactions, with expertise in SNARKs, PLONK, KZG, FRI, and recursive proofs.
- daml-lint Rust-based static analysis scanner for Daml smart contracts with six detectors targeting conservation violations, unguarded division, non-deterministic ordering, and other Daml-specific vulnerability classes.
- daml-props Property-based testing framework written in pure Daml for generating random action sequences and shrinking failures to minimal reproductions, following QuickCheck and Echidna lineage.
- daml-verify Formal verification tool using Z3 prover to prove critical invariants including conservation, division safety, temporal ordering, and vault properties across all possible inputs.
Quantifiable outcome
- $250 billion in onchain value secured across protocols and institutions
- +5 more outcomes
Companies that use OpenZeppelin
Customer profileNamed customers24 records
Segments5 records
Ideal customer profiles4 records
OpenZeppelin technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration4 records
AI capability7 records
Feature7 records
OpenZeppelin partnerships and signals
Strategic signalPartnerships
Six partnerships are on record, tiered minor and core.
- PharosminorPharos announced OpenZeppelin as a security partner ahead of its mainnet launch. Collaboration includes blockchain audits, penetration testing, and real-time monitoring systems for enhanced security infrastructure.
- MidnightcoreOpenZeppelin hosted the Automated Market Maker Challenge hackathon for Midnight's ecosystem. Midnight is a ZK identity platform that partnered with OpenZeppelin for developer ecosystem expansion and security tooling integration.
- ArbitrumcoreOpenZeppelin provides contracts library implementation for Stylus, DAO security proposal reviews, and Relayer/Monitor support for Arbitrum One, Arbitrum Nova & Arbitrum Sepolia.
- StarkwarecoreOpenZeppelin provides contracts library implementation for Cairo, supporting Starknet's ecosystem with battle-tested smart contract components.
- Matterlabs (ZKsync)coreOpenZeppelin secures ZKsync releases and reduces response time with comprehensive security support for the ZKsync ecosystem.
- CompoundcoreOpenZeppelin secures all Compound DAO governance proposals and incidents, providing continuous security monitoring and incident response.
Scale indicators12 records
Recent moves6 records
Expansion highlights1 record
OpenZeppelin competitors and assessment
Company assessmentDirect peers
- Zellic: Zellic is a smart contract and blockchain security firm specializing in audits and applied cryptography research. Emerging direct competitor to OpenZeppelin, particularly for ZK-rollup and Layer 2 security engagements.
- Sigma Prime: Sigma Prime is a blockchain security and infrastructure firm known for Lighthouse (Ethereum consensus client) and core protocol audits. Direct competitor in blockchain infrastructure and Layer 1 security engagements.
- Spearbit: Spearbit is a network of independent top-tier security researchers competing in the smart contract audit market. Direct competitor for high-end audit engagements, particularly on complex DeFi protocols and ZK systems.
- Quantstamp: Quantstamp is a smart contract security auditing firm offering audits and an automated security scanning platform. Direct competitor to OpenZeppelin across standard DeFi audits and protocol security reviews.
- Halborn: Halborn is an end-to-end blockchain security firm offering smart contract audits and penetration testing. Direct competitor to OpenZeppelin's audit and Continuous Security Program offerings.
- Runtime Verification: Runtime Verification is a formal verification and security firm with deep Ethereum expertise (EVM formalization, Casper FFG verification). Direct competitor in formal verification services overlapping with OpenZeppelin's higher-assurance engagements.
- Trail of Bits: Trail of Bits is a premier smart contract and blockchain security firm offering audits, formal verification, and security tooling. Direct competitor to OpenZeppelin's audit practice, serving similar DeFi protocols and Layer 2 networks with comparable service offerings.
- Consensys Diligence: Consensys Diligence is the smart contract auditing arm of Consensys and a foundational competitor in smart contract security. Directly competes with OpenZeppelin's audit services across the Ethereum ecosystem, with MythX as a competing static analysis platform.
- Certora: Certora specializes in formal verification of smart contracts using its Certora Prover. A direct competitor to OpenZeppelin's formal verification and ZKP audit capabilities, particularly for high-assurance DeFi protocols.
- ChainSecurity: ChainSecurity (acquired by PwC) is a blockchain security firm specializing in smart contract audits and formal verification. Direct competitor to OpenZeppelin, particularly in formal verification and protocol security.
Market position
Strengths5 records
Weaknesses4 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
OpenZeppelin social profiles
Digital presenceOpenZeppelin compliance and trust
Trust signalCompliance2 records
OpenZeppelin financial estimates
Financial estimateRevenue estimate
Valuation estimate
OpenZeppelin leadership team
Management profileNumber of profiles
Profiles6 records
OpenZeppelin funding detail
Funding detailFunding overview
Funding rounds2 records
Investors9 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
OpenZeppelin M&A and investment
M&A and investmentM&A
Investments2 records
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about OpenZeppelin
What does OpenZeppelin do?
OpenZeppelin provides professional security audit services and an open-source development stack for smart contracts powering onchain finance. Its offerings include the industry-standard Contracts Library, the Defender cloud operations platform, the AI-powered AI Auditor, and a Continuous Security Program subscription, complemented by tools covering transaction relaying, monitoring, and Daml verification for institutional Canton Network deployments.
Is OpenZeppelin a public or private company?
OpenZeppelin is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was OpenZeppelin founded?
OpenZeppelin was founded in 2015. It employs 11 to 50 people.
Where is OpenZeppelin based?
OpenZeppelin is headquartered in San Francisco, Spain, in the Europe region.
How does OpenZeppelin make money?
Four revenue lines are on record. Continuous Security Program Subscriptions are the primary driver. The others are security Audits, defender Cloud Services and commercial Licensing.
Who are OpenZeppelin's main competitors?
Direct peers on record are Zellic, Sigma Prime, Spearbit, Quantstamp, Halborn, Runtime Verification, Trail of Bits, Consensys Diligence, Certora and ChainSecurity.
Does OpenZeppelin have an API?
Yes. OpenZeppelin provides an API for Defender, enabling developers to programmatically manage smart contract operations including transaction relaying, monitoring, and automation. Defender API supports transaction policies, automated execution, and integration with existing infrastructure. The AI Auditor uses model-agnostic architecture and integrates with frontier AI models.
What industry is OpenZeppelin in?
OpenZeppelin's product category is Blockchain Smart Contract Security. Its primary akta.pro industry code is FSAPAJAA, Smart Contract Auditing & Formal Verification, with a secondary code of FSAPABAB, Smart Contract Frameworks & SDKs (developer kits, templates, standards). Its NAICS code is 561621.