Solving Security’s
Hardest Problems.

Vaultline (formerly 0xTeam) breaks smart contracts, applications, and infrastructure the way real attackers do, then helps you fix them.

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Track record01/04

Security reviews

SCAN_ACTIVE0x… VERIFIED

Trusted by

Four practices. One team that thinks like an attacker, from contract to cloud.

Blockchain & Smart Contracts

Every layer. Contracts, protocols, bridges and the off-chain services around them.

Application Security

Root causes. Code, API, cloud and infra review that traces every bug to the design flaw producing it.

AI/ML Security

Production AI. Agent loops and model integrations, the attack surface where agents handle real funds.

Research & Development

Public work. Engagement findings turned into write-ups, breach analyses and tools like Leon AI.

Services

We break it the way real attackers do. Then we help you fix it.

Blockchain & Smart Contract SecurityEVM and non-EVM, on-chain to off-chain

We review every layer of a blockchain system, from contracts and protocols to bridges and the off-chain services that run them. Manual review backed by static analysis and fuzzing.

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SlitherEchidnaMythrilBridgesProtocols

Application SecurityEvery bug traced to its design flaw

Code, API, cloud, and infrastructure review that traces every bug to the design flaw producing it, so the fix closes the class of issue, not just the instance.

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Code reviewAPIAuthWeb & mobile

AI/ML SecurityAgents that touch real funds

We research and review AI systems in production: agent loops, model integrations, and the attack surface where autonomous agents handle real money.

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Prompt injectionJailbreaksTool abuseModel integrations

Penetration Testing & Red TeamPlus incident response when it matters

Goal-based testing that chains small weaknesses into real impact, and hands-on incident response when something has already gone wrong.

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PentestingRed teamIncident response

Products

Built in-house.

All products

AI Security Agent

Leon AI

Your personal AI security agent

AI-powered vulnerability detection for smart contracts, EVM and non-EVM. Bug classification with severity scoring, code-quality assessment, remediation suggestions, built from patterns across 300+ audits.

Coming soon

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AI Penetration Testing

AI Red Team

Adversarial testing for AI systems

Goal-based adversarial testing for AI systems: prompt injection, jailbreak paths, agent tool abuse, and model integration flaws. We attack your AI the way real adversaries do, before they get the chance.

Coming soon

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Recent works

Featured security reports.

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98.8%

DZap

Chain: Ethereum
Type: Public
Language: Solidity
Status: Completed

View audit details

98%

FunToken Multichain

Chain: Ethereum
Type: Public
Language: Solidity
Status: Completed

View audit details

98.5%

Brain Frog

Chain: Ethereum
Type: Public
Language: Solidity
Status: Completed

View audit details

100%

BigWater

Chain: BNB
Type: Public
Language: Solidity
Status: Completed

View audit details

Customer reviews

Why clients trust us.

“Vaultline (formerly 0xTeam) provided us with a comprehensive audit that uncovered critical and hidden vulnerabilities. Their turnaround was fast, and communication was seamless. The team was highly professional and technically sound. We felt secure launching post-audit.”

Playarts Ai@playartsdotai

“The audit experience with Vaultline (formerly 0xTeam) was exceptional. Their findings were detailed, accurate, and easy to follow. They identified logic bugs others missed. Our smart contracts are now more robust thanks to their efforts.”

DZap@dzap_io

“Working with Vaultline (formerly 0xTeam) was smooth from start to finish. Their security insights helped us fix serious issues early. Their report was thorough, and the post-audit call added great clarity. Definitely our go-to team for future audits.”

Funtoken@funtoken_io

“We needed a reliable audit before launch, and Vaultline (formerly 0xTeam) delivered. Their approach blended automation and manual review perfectly. The team was responsive, skilled, and security-focused. We gained major trust from users post-audit.”

AMGI Studios@amgistudios

“We loved how hands-on Vaultline (formerly 0xTeam) was during our audit. They didn't just find issues, they educated us too. The report was actionable, clear, and helped our developers level up. Our product is now safer and play-ready.”