10 Best On-Chain Bounty Platforms for Crypto Projects In 2026

In this article, I will discuss the Best On-Chain Bounty Platforms For Crypto Projects that help blockchain companies find smart contract vulnerabilities, improve security & protect digital currencies.

We will see their key features, pricing and rewards, supported blockchain networks, payout methods, and target audiences to help crypto projects choose the right security platform for their needs.

How We Select the Best On-Chain Bounty Platforms for Crypto Projects

• Security Reputation: Platform reputation, industry experience, security history.
• Blockchain Support: support Ethereum, Solana, Polygon and other chains.
• Pricing: The cost of the platform, audit fees, and affordability overall.
• Payment Options: Available currencies, withdrawal methods, and payment transparency.
• Researcher Community : Number and expertise of ethical hackers and security auditors.
• Vulnerability Coverage: Ability to find critical vulnerabilities in intelligent contracts and protocols.
• Transparency: Clear program rules, reporting procedures and reward distribution policies.
• Customer Support: For assistance with vulnerability reports, security reviews, and technical issues.
• Project Suitability: How the platform meets the security requirements of various crypto projects.

Key Points & Best On-Chain Bounty Platforms for Crypto Projects

Platform	Explanation
Immunefi	Connects crypto projects with ethical hackers to identify vulnerabilities and earn rewards.
Sherlock	Provides smart contract security audits through competitive contests and incentivized vulnerability discoveries.
HackenProof	Offers bug bounty programs connecting blockchain projects with security researchers worldwide.
HackerOne	Helps organizations identify security vulnerabilities through crowdsourced ethical hacking and rewards.
Code4rena	Organizes competitive smart contract audits where researchers discover bugs for prize pools.
Spearbit	Provides expert-led blockchain security reviews through specialized decentralized security research teams.
Cantina	Connects Web3 projects with security experts for audits and vulnerability competitions.
Zellic	Delivers advanced blockchain security audits and smart contract vulnerability assessments for projects.
OpenZeppelin Defender	Helps teams monitor, automate, and secure smart contract operations across blockchain networks.
ChainSecurity	Specializes in blockchain security audits, smart contract verification, and protocol risk assessments.

10 Best On-Chain Bounty Platforms for Crypto Projects In 2026

1. Immunefi

Immunefi is the leading Web3 security and bug bounty platform that connects crypto projects, ethical hackers and blockchain security researchers. It assists DeFi protocols, exchanges, wallets, bridges and blockchain networks in finding critical vulnerabilities through ongoing bounty programs and competitive audit contests. Project awards are determined by vulnerability severity, potential financial impact, and program specific requirements.

There are big rewards for critical vulnerabilities. Blockchain Support: Its programs include Ethereum, Polygon, Solana, Arbitrum, Optimism, BNB Chain and other ecosystems. Payout Method & Currency: Rewards are usually in USD and typically paid in USDC, but individual program terms can differ. Target audience: DeFi projects, Web3 developers, blockchain companies, professional security researchers.

Immunefi Key Features

• Bug Bounties for a Smart Contract: Assists crypto projects in discovering vulnerabilities via structured bounty programs.
• Competitive Security Audits: Connects projects with experienced researchers to find key security vulnerabilities.
• Severity-Based Rewards: Supports reward structures based on the severity and impact of a vulnerability.
• Multi-Chain Security: It supports projects on Ethereum, Polygon, Solana, Arbitrum and other blockchain ecosystems.

Immunefi Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Platform fees depend on the selected services and commercial agreement.
Bounty Budget	Crypto projects establish their own reward budgets based on vulnerability severity and potential financial impact.
Researcher Rewards	Rewards are denominated in USD and paid in USDC. Individual programs determine exact amounts.
Reward Structure	A published program example offers $1,000 for low, $5,000 for medium, $5,000–$10,000 for high, and $10,000–$50,000 for critical smart contract vulnerabilities.

2. Sherlock

Sherlock is a Web3 security platform that integrates smart contract audits, competitive security contests, and post-launch bug bounty programs. It links crypto projects with seasoned auditors who vet protocol code and discover vulnerabilities pre- or post-deployment. Its security model also includes optional protection against qualifying exploits.

Reward System: Researchers compete for prize pools and may be eligible for rewards for qualifying vulnerabilities under the terms of their individual bounty. Blockchain Support Its security work focuses on smart contract security, including EVM-based ecosystems and selected other blockchain environments, depending on the engagement.

Payout Method & Currency USDC is an important reward currency for its security contests, with payment terms that vary by program. Target Audience: DeFi protocols, blockchain startups, experienced auditors, and independent security researchers.

Sherlock Key Features

• Competitive Auditing: Conducts security competitions where researchers analyze smart contract code in isolation.
• Smart Contract Coverage: Provides coverage against qualifying security incidents for eligible protocols.
• Expert Security Researchers: Connects blockchain projects with established independent security researchers.
• Vulnerability Rewards: Supports contest prize pools and applicable bug bounty incentives.

Sherlock Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Commercial fees depend on the audit engagement and selected security services.
Audit Budget	Projects establish contest prize pools according to codebase complexity and security requirements.
Researcher Rewards	Researchers receive rewards for valid vulnerabilities according to contest judging and severity rules.
Reward Structure	Contest prizes are distributed among eligible researchers. Optional Sherlock Audit Cover has separately agreed pricing, with published cover rates of 2% for public contests and 2.5% for private contests.

3. HackenProof

HackenProof is a Web3 bug bounty platform that assists crypto exchanges, DeFi protocols, blockchain applications and wallet providers to find security vulnerabilities. It connects organizations with a global community of ethical hackers and provides vulnerability submission, program management and security triage services.

Reward System: Each project defines bounty budgets and rewards researchers based on severity and validity of reported vulnerabilities. Rewards differ between individual programs. Blockchain Support: Its programs include blockchain ecosystems, intelligent contracts, exchanges, wallets, and Web3 applications, depending on the scope of the project.

Currency & Payment Method: Researchers can collect rewards in USDC on Base, BTC or ETH. The lowest withdrawal is $100 as recorded. For whom? Crypto startups, exchanges, DeFi developers and professional bug hunters.

HackenProof Key Features

• Crowdsourced Bug Hunting: Connects crypto projects with ethical hackers and security researchers worldwide.
• Custom Bounty Programs: Enables organizations to configure vulnerability scopes and reward budgets.
• Vulnerability Management: Enables vulnerability submission, reporting and security triage.
• Multi Blockchain Ecosystems: Supports security programs for DeFi apps, exchanges, wallets and blockchain projects.

HackenProof Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Crowdsourced audit documentation specifies a 10% operational and judging fee.
Bounty Budget	Projects provide a refundable deposit and establish a security reward budget.
Researcher Rewards	Rewards can be paid in stablecoins, fiat currencies, or the project’s own cryptocurrency.
Reward Structure	The documented audit model allocates 40% to critical, 30% to high, 15% to medium, and 5% to gas optimization and best-practice findings.

4. HackerOne

HackerOne is a mature crowdsourced cybersecurity platform that connects organizations to independent security researchers to find vulnerabilities in websites, applications, APIs and digital infrastructure. It’s not specifically built for blockchain projects, but crypto companies can tap into its bug bounty programs to supplement their broader security infrastructure.

Reward System: Organizations set bounty amounts based on severity of vulnerability, impact on business, and individual program policy. Blockchain Support: If a program’s stated scope includes support for applications and infrastructure related to blockchain, it may do so.

Payout Method & Currency: Bank transfer, PayPal, Bitcoin (BTC), USD Coin (USDC). Availability and payment options are subject to eligibility. Who’s it for? Cryptocurrency companies, technology companies, security teams and ethical hackers.

HackerOne Key Features

• Crowdsourced Security Testing: Links organizations with independent cybersecurity researchers across the globe.
• Bug Bounties on demand: Companies can set the scope of vulnerabilities and the financial rewards.
• Vulnerability Disclosure – Offers structured workflows for reporting and communicating vulnerabilities.
• Security Management: Provides tools for vulnerability triage, tracking and remediation.

HackerOne Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Offers subscription-based pricing through Professional, Enterprise, and Enterprise Plus editions.
Bounty Budget	Organizations determine reward budgets according to their security requirements and program scope.
Researcher Rewards	Researchers receive payments for accepted vulnerabilities, with customers approving individual payouts.
Reward Structure	Reward amounts depend on vulnerability severity, business impact, and program-specific reward policies. Platform subscription and bounty rewards are separate costs.

5.Code4rena

Code4rena was a competitive smart contract auditing platform where independent security researchers, known as wardens, competed to find vulnerabilities in blockchain projects. The model, which stemmed from a contest, let multiple researchers look at the same codebase and submit their findings for review.

Reward System: The contest organizers set up prize pools and allocated rewards according to the validity of the findings, the severity of the vulnerability, and the rules of the competition. Blockchain Support: Its audit competitions have mostly been centered around Solidity-based intelligent contracts and EVM-compatible ecosystems.

Payout Method & Currency: Rewards for contests were typically paid out in USDC, but specific contests may have other arrangements. Who Should Join: Blockchain startups, DeFi developers, experienced smart contract auditors, and independent researchers. Status: Code4rena announced it would wind down operations in May 2026, with Immunefi assisting with migrating customers and researchers.

Code4rena (C4) Key Features

• Competitive Auditing Contests: allows investigators to participate in smart contract security competitions
• Independent Code Reviews: Encourages multiple auditors to review the same blockchain codebase.
• Contest Rewards: Rewards are distributed based on valid vulnerabilities found.
• Technical Research Community: Encourages collaboration between experienced smart contract security researchers.

Code4rena Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Historical audit contests used project-funded prize pools rather than a universal fixed audit price.
Contest Budget	Projects established competition budgets according to codebase size and audit requirements.
Researcher Rewards	Wardens historically received prize distributions for valid and accepted vulnerability findings.
Reward Structure	Historical rewards were distributed according to vulnerability severity and contest judging. Code4rena announced its wind-down in May 2026, so these details should not be presented as current booking prices.

6. Spearbit

Spearbit is a dedicated blockchain security auditing firm providing professional smart contract review and vulnerability research for Web3 projects. It pairs experienced security researchers with blockchain development teams to assess protocol architecture, identify exploitable weaknesses and improve code security.

Its auditing experience supports projects that require more technical assessment than standard automated testing. Reward System Spearbit is largely based on paid security engagements, rather than a standard public bounty reward pool. Blockchain Support: Its work ranges from smart contract support to various blockchain ecosystems depending on the engagement.

Payout Method & Currency: Client payments are based on individual service agreements; there is no universal researcher bounty currency or payout method. Who is it for? DeFi protocols, blockchain infrastructure companies, Web3 startups and anyone in need of expert security audits.

Spearbit Key Features

• Expert Smart Contract Security Audits: Professional security audits.
• Expert Researchers: Pairs projects with seasoned blockchain security experts.
• Protocol Audits: Reviewing smart contract architecture, logic and potential exploits.
• Advanced Security Research: Provides expertise regarding cryptography, DeFi, and blockchain infrastructure.

Spearbit Pricing & Rewards

Pricing & Rewards	Details
Audit Pricing	Pricing is generally customized according to project complexity, codebase size, and engagement requirements.
Engagement Budget	Projects agree on audit scope, researcher involvement, and service costs before starting.
Researcher Compensation	Security professionals are compensated through professional audit engagements rather than standard public bounty payouts.
Reward Structure	There is no universal public bounty prize structure. Payment arrangements depend on individual contracts and security services.

7. Cantina

Cantina is a Web3 security platform connected to Spearbit that connects blockchain projects with professional security researchers through audit competitions, bug bounty programs and security engagements. It enables independent vulnerability assessments of projects and competition between researchers in security reviews.

Reward System: Competition prize pools and vulnerability-based bounty rewards are determined by projects, generally according to severity and quality of submission. Blockchain Support: Depending on the project’s needs, its programs include Ethereum, Solana, Base, Arbitrum and other ecosystems.

Payout Method & Currency: Cantina has a documented system for researcher payouts that allows for the transfer of USDC to Ethereum mainnet wallet addresses, following KYC verification. Who should attend: DeFi protocols, Web3 companies, experienced auditors, and independent security researchers.

Cantina Key Features

• Security Competitions: Organizes competitive smart contract audits and vulnerability discovery programs.
• Bug Bounty Programs: Helps blockchain projects reward researchers for identifying security weaknesses.
• Expert Researcher Network: Connects Web3 organizations with professional security researchers.
• Vulnerability Management: Provides structured security findings, submissions, and review workflows.

Cantina Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Public standard platform pricing is not disclosed; project fees depend on the selected engagement.
Competition Budget	Projects establish prize pools for competitive smart contract security audits.
Researcher Rewards	Researchers receive USDC payments for eligible findings according to contest rules and severity.
Reward Structure	Competition rewards are distributed according to validated findings, severity, and judging rules. Cantina requires KYC and supports USDC payments to Ethereum mainnet addresses.

8. Zellic

Zellic is a blockchain security firm focused on smart contract audits, vulnerability research, cryptography and advanced protocol security assessments. It works with crypto projects to find security weaknesses with manual code reviews, static analysis, dynamic testing and specialized technical research. Its services are especially relevant for projects that develop complex blockchain infrastructure and decentralized applications.

Reward System Zellic is primarily a platform for contracted security audits, rather than a standardized public bug bounty marketplace. Blockchain Support: Familiarity with Ethereum and EVM networks, Solana, Aptos, Sui, Cosmos and zero-knowledge systems.

Payout Method & Currency: Client payments are based on individual engagement agreements; no universal researcher bounty currency or payout method is published. Who this is for: Blockchain developers, DeFi protocols, Layer-1 Networks, Web3 infrastructure companies.

Zellic Key Features

• Smart Contract Audit: Comprehensive security audit of blockchain applications.
• Cryptographic Research: Researches cryptographic implementations and complex protocol security.
• Technical Vulnerability Detection: Collaborates with manual research and technical testing methods.
• Multi-Ecosystem Expertise: Provides security assessments for Ethereum, Solana, Aptos, Sui, and other ecosystems.

Zellic Pricing & Rewards

Pricing & Rewards	Details
Audit Pricing	Custom quotations are provided according to the project’s technical requirements and assessment scope.
Engagement Budget	Costs depend on protocol complexity, engineering resources, and the required security review.
Researcher Compensation	Security researchers and auditors work through professional security engagements rather than standard public bounty programs.
Reward Structure	No standardized public bounty reward pool or fixed researcher payout schedule is advertised. Payment terms are established through individual service agreements.

9.OpenZeppelin Defender

OpenZeppelin Defender is a smart contract security operations and automation platform that helps blockchain development teams manage deployed contracts and improve operational security. It is able to automate transactions, access control, monitoring and administrative workflows to enable secure smart contract management.

Defender is not a dedicated bounty marketplace, but rather a solution designed to help project teams secure and manage their blockchain applications. Reward System: It does not have a standardized public bug bounty reward system.

Projects need to arrange rewards themselves. Blockchain Support Its documented network integrations are Ethereum, Arbitrum, Polygon, Base, Avalanche, and other EVM-compatible networks.

Payout Method & Currency: There is no standard researcher payout currency or bounty withdrawal method. Audience: Smart contract developers, DeFi teams, blockchain infrastructure providers, Web3 security engineers

OpenZeppelin Defender Key Features

• Transaction Automation: Automates smart contract operations and administration transactions.
• Security Monitoring: Aids development teams in monitoring blockchain activity and contract operations.
• Permissioning: Provides secure management of smart contract permissions and admin roles.
• Operational Security: Offers tools for managing and securing deployed intelligent contracts.

OpenZeppelin Defender Pricing & Rewards

Pricing & Rewards	Details
Platform Pricing	Historically offered Builder, Professional, and Enterprise subscription tiers.
Subscription Budget	Professional and Enterprise plans provided additional features, quotas, and support options.
Researcher Rewards	Defender was a security operations platform, not a dedicated bug bounty marketplace.
Reward Structure	It did not provide standardized vulnerability rewards or researcher payouts. Important: Defender’s legacy service reached its final shutdown on July 1, 2026.

10. ChainSecurity

ChainSecurity is a blockchain security company specializing in smart contract auditing, formal verification and protocol security assessments. It works with DeFi projects, blockchain foundations and fintech organizations to identify vulnerabilities, assess contract logic and strengthen decentralized infrastructure.

Its professional security reviews help development teams mitigate technical risks prior to deploying critical blockchain applications. Reward System ChainSecurity does not operate on a public bounty marketplace with fixed rewards for researchers but on professional auditing engagements.

Blockchain Support: Has experience with auditing in Ethereum, Solana and other blockchain ecosystems depending on the needs of the project. Payout Method & Currency: Clients pay through their service contracts, there is no universal public bounty currency or researcher withdrawal system. Who Should Attend: DeFi protocols, blockchain foundations, financial institutions and Web3 infrastructure developers.

Chains Security Key Features

• Smart Contract Audits: Locates vulnerabilities using professional blockchain security audits.
• Formal Verification: Uses mathematical methods to verify critical properties of intelligent contracts.
• Protocol Security: Assess blockchain infrastructure and decentralized finance protocols.
• Risk Assessment: Assist organizations to identify technical vulnerabilities and improve blockchain security.

ChainSecurity Pricing & Rewards

Pricing & Rewards	Details
Audit Pricing	Security audit pricing is customized according to the project’s scope and technical requirements.
Engagement Budget	Project costs depend on protocol complexity, code size, and required security expertise.
Researcher Compensation	Security professionals are compensated through contracted auditing and research engagements.
Reward Structure	No standardized public bug bounty prize pool or fixed researcher payout structure is advertised. Commercial payment terms are agreed upon individually.

Conclusion

To summarize, choosing the right on-chain bounty platforms is vital for blockchain companies to identify vulnerabilities, secure intelligent contracts, and enhance overall security. Platforms with bug bounty programs include Immunefi

Sherlock, and HackenProof, while Spearbit, Zellic, and ChainSecurity offer professional security audits. Before you decide on a platform for your project, make sure to look into the price, rewards, blockchain compatibility, and security services.

FAQ