AI-powered external attack surface management (EASM)

See your exposure the way an attacker sees it. First.

TONK starts from a single domain, automatically discovers everything you expose to the internet, uses AI to surface the exposures that are actually reachable and exploitable, and turns "possible" into "confirmed" with one approved test. Not a quarterly scan: it keeps watching, around the clock.

Request a demo How TONK works

01
DiscoverFrom one seed domain: subdomains, IPs, open services, certificates, cloud assets and shadow IT, mapped automatically.
02
PrioritiseAI weighs whether an exposure is reachable from outside and whether an exploit exists, so the dangerous ones rise to the top.
03
ValidateOne approved action confirms whether an exposure is real and clears the false positives. Then it keeps watching.

It sees what your internal tools structurally cannot

Forgotten subdomains. Test environments nobody decommissioned. Cloud instances nobody remembers creating. DNS records pointing at infrastructure you no longer control. Everything you expose to the internet is a target, and internal security tools are blind to it. TONK covers that outside view.

Automated attack surface discovery

Domains, subdomains, IPs, open services, SSL certificates and technology stacks, mapped in real time. No manual inventories, no spreadsheets.

AI-driven prioritisation

CVE signatures generated from scan telemetry, enriched with exploit maturity and known-exploited status (CISA KEV), so your team works on what matters.

Exposure validation

Reachable exposures lead the dashboard, and within an approved scope TONK confirms whether they can actually be used against you. Proof, not just a list.

Continuous monitoring

New services, opened ports, expiring certificates and emerging vulnerabilities are flagged within hours, not found at the next quarterly scan.

Digital risk monitoring

Leaked credentials on the dark web, phishing domains imitating you, secrets in public code, executive impersonation: brand and identity threats in one view.

Third-party risk

A–F exposure scoring for suppliers and partners, with visibility into their suppliers too. Know before their problem becomes yours.

Who it is for

Built for teams like these

Mid-sized companies with one or two security people and thousands of "possible" findings nobody can triage by hand
Organisations with assets spread across AWS, Azure and hosting providers, where "what is ours?" is the first question
Companies that need to assess the security posture of suppliers and partners
Executives for whom one penetration-test report a year is not enough reassurance

Start

One domain

Give us your primary domain and we show you your external exposure first. Nothing to install.

Run

SaaS subscription

A cloud-hosted subscription. The dashboard is built for the security team and the boardroom alike.

Support

Korean support and consulting

YSA Labs supports onboarding and operation in Korean and English, and can carry remediation through as consulting.

TONK validates only within an approved scope: assets the customer owns or controls, under written consent.

Services

Behind TONK, there are people

Fixing what TONK finds, changing systems, and putting AI to work are done by people. YSA Labs does four things.

IT consulting

A written, honest account of the gap between the systems you have and the systems you need.

IT strategy and architecture
Cloud (AWS) migration planning and cost review
Information-security and security-architecture reviews
System selection: RFPs and vendor evaluation

Software development

Applications and SaaS products shaped to the work, from design through to operation.

Custom web and business applications
SaaS product design and build
Automation and system integration (APIs)
Maintenance and enhancement

AI adoption

We start from the work, not the hype: where will AI actually save time, and what does it need to be safe?

Assessment of where AI fits in each workflow
LLM and AI-agent automation
Connecting internal documents and data (RAG)
Operation, security review and training after launch

Cloud build and operations

A secure, cost-efficient environment on AWS, and the operations to keep it that way.

AWS architecture design and build
Operations, monitoring and cost optimisation
Security configuration and access control
Solutions supplied through AWS Marketplace

AWS MARKETPLACE · 2027

How we work

Small proof before big proposals

Every stage leaves a document the next person can read and understand.

STEP 1

Assess

We look at the current systems, data, people and budget together, and write the goal on one page.

STEP 2

Design and propose

Scope, timeline, cost and risks in writing. Where it helps, a small pilot build confirms the approach first.

STEP 3

Build and hand over

Built and verified in stages. The project ends with operations documentation and training, not before.

About

About YSA Labs

YSA Labs is the IT consulting and software brand of PaySolution Limited, a Korean company established in Seoul in December 2024. Our team has worked in both Korea and Australia, and we apply the working standards of both countries.

YSA stands for Yield · Software · AI: measurable results, software built for the work, and AI that is used in real operations. TONK is those three things in one product.

PaySolution Limited will be renamed YSA Labs Limited in early 2027.

Brands: YSA Labs · TONK
Company: PaySolution Limited (페이솔루션 유한회사)
Founded: 6 December 2024
Registered business: IT consulting, software development and sales, payroll and HR services
Location: Gangnam-gu, Seoul

Contact

Demo requests and enquiries

For a TONK demo, send your primary domain and a contact. For consulting, a short note on the background of your project and the result you want. We reply within two business days, in English or Korean.

Email: contact@paysolutions.ltd
Address: 9F, 109 Teheran-ro, Gangnam-gu, Seoul 06134, Republic of Korea
서울특별시 강남구 테헤란로 109, 9층 (역삼동, 강남제일빌딩)
Hours: Mon–Fri 09:00–18:00 KST