Problem

Parameter addresses the mismatch between software development speed and conventional security testing. Companies may ship changes every day, while traditional penetration tests take weeks to schedule, cost six figures per engagement, examine only one snapshot, and often produce a PDF that is stale on arrival. The resulting gap leaves teams blind for long periods even as new vulnerabilities enter production; the company’s launch materials characterize the broader economic problem as more than $10 trillion in annual losses from preventable vulnerabilities.

The killer use case is continuously finding and proving exploitable weaknesses in web applications, APIs, and infrastructure before attackers can use them. Parameter’s launch materials describe agents uncovering critical SQL injection, network-worm, and codebase-access vulnerabilities across dozens of YC companies, positioning rapid validation of high-impact flaws—not merely surface-level scanning—as the core customer value.

Product / Service

Parameter is an agentic offensive-security platform, formerly Hex Security, that uses autonomous AI agents to run penetration tests continuously, on demand, and around releases. A customer can provide a URL and credentials without installing agents or sharing source code; the agents reason like a human red team across APIs, authentication flows, business logic, cloud environments, code, and dependencies. Source access is optional for deeper coverage.

The platform returns prioritized findings with reproduction steps, a working proof of concept, and remediation guidance. Its central benefit is replacing delayed, point-in-time assessments with same-day or continuous feedback: the company says first findings can arrive within 24 hours and that findings are only reported when an agent can demonstrate a real exploit. Parameter also emphasizes operational safeguards, including authorized scoping, no destructive actions, an explicit stop after proof, and a complete audit trail, making the service intended for controlled use against production or staging systems.

Market

Parameter competes in agentic offensive security and continuous or autonomous penetration testing, alongside traditional human-led penetration-test providers. The adjacent competitive set includes XBOW, which describes itself as an autonomous offensive-security platform, and established continuous-testing vendors such as Pentera and Horizon3.ai’s NodeZero; broader vendor comparisons also include Equixly, NetSPI, Synack, and BreachLock. Parameter’s differentiation is its emphasis on AI agents that continuously test applications and infrastructure and validate findings with exploit proof rather than simply flagging signatures.

The company is an early-stage entrant: Y Combinator lists it as founded in 2026, Winter 2026, active, and a team of 10. Public traction claims include testing dozens of YC companies, an estimated $3 billion or more in potential damages prevented, and homepage claims of 24/7 coverage, fewer than 1% false positives, and first findings within 24 hours. A secondary funding database reports $500,000 of pre-seed funding announced in March 2026. The available evidence does not disclose revenue or confirmed paying-customer counts, so Parameter is best characterized as early commercial-stage rather than definitively confirmed pre-revenue.