Parameter

Parameter, a Y Combinator-backed security startup, launched a platform of AI agents that continuously find vulnerabilities in web apps, APIs, and infrastructure, claiming first findings within 24 hours and less than 1% false positives. The company says its agents have prevented more than $30 billion in breaches and pair autonomous pentesting with a pull-request reviewer called Sentinel, cloud misconfiguration checks, secrets detection, and dependency management. Parameter states its agents confirm a vulnerability and then stop, with no destructive actions and a full audit trail, positioning the product against traditional pentests that take weeks to scope and cost six figures per engagement.

Backed by Y Combinator Security at the speedof development. AI agents that find vulnerabilities in your web apps, APIs, and infrastructure. Continuously, not once a year. See first findings in 24 hours $30B+ in breaches prevented <1% false positives 24/7 continuous coverage Built by the team that secured: Built by the team that secured: the problem Software ships every day.Security testing hasn't kept up. Old Way Weeks to schedule and scope. Six figures per engagement. A PDF that's already stale on arrival. One snapshot, then blind for 12 months. The Parameter Way Point us at your app, easy scoping. Runs continuously, on demand. Every finding ships a working proof-of-concept. Probes every hour, every day. how it works The product Findings you can act on.Validated, prioritized, and ready to assign. Book a call See first findings in 24 hours Findings › Acme API pentest › ACME-142 SQL injection in /api/users search param The search parameter on GET /api/users is concatenated directly into a SQL query without parameterization. An attacker can inject arbitrary SQL to read or modify data belonging to other tenants. Reproduction GET /api/users?search=' OR '1'='1 → 200 OK · returns all users across tenants The vulnerable code interpolates the raw value into the WHERE clause in users-repository.ts:42. Activity Jordan Lee created this finding 3d ago Alex Rivera changed status to In Progress 2d ago Maya Chen assigned this to Jordan Lee 1d ago Add a comment... Properties Status Open Severity Critical Assignee J Jordan Lee Rating CWE CWE-89 Deadline Overdue · Jun 12 Locations users-repository.ts:42 Open a fix PR Create Linear Issue Copy AI Instructions Search findings Open 21 In Progress 6 Fixed 15 Showing 1 to 25 of 47 findings ‹ Previous Page 1 of 2 Next › coverage One platform.Every layer of your security. Parameter runs continuously across your code, cloud, and dependencies, and puts everything it finds in one place. Pentesting agent Continuous, autonomous pentesting, with a working proof-of-concept for every finding. Sentinel An AI reviewer on every pull request. Catches vulnerabilities before they merge. Cloud security Continuous checks for cloud misconfigurations, exposed services, and takeover risk. Secrets detection Leaked keys, tokens, and credentials found across your repos and history. Dependency management Vulnerable and outdated packages flagged, with a clear path to safe versions. More detail on each surface Learn more safety Aggressive testing.Zero blast radius. All the findings of a real attack, none of the fallout. learn more about safety Confirm and hold Agents prove a vulnerability exists, then stop. No chaining or escalation without your explicit go-ahead. Scoped, never stray Agents stay inside the targets you authorize. No wandering into systems that aren’t in scope. No destructive actions No dropped tables, no deleted data, no denial of service. Testing is safe against production by design. Full audit trail Every action an agent takes is logged and reviewable, so you can see exactly what happened. Start testing today. A URL and credentials is all it takes. First findings land within 24 hours.