Cyber attacks, killed in under 100ms.
KYSIRA: From the Greek Kyrios (authority over) and Thyra (door/gate): "Guardian of the threshold"
The average breach takes 247 days to identify and contain, by IBM's 2026 Cost of a Data Breach count. Kysira blocks attacks in under 100 milliseconds, before they reach your app, your users, or the news. No code changes. No new agents. One container.
The same attacks have topped the charts for 20 years. Most companies still find out months too late.
Injection, broken access control, cross-site scripting, server-side request forgery. OWASP has put some version of this list at the top of its Top 10 since 2003, and it still shows up in the breach reports every year. Detection mostly still means a person in a security operations center reading a dashboard. Someone has to notice before anyone can respond, and that is where the months go.
Most organizations are still defending at human speed. Attackers have already moved to machine speed.
Status quo
An analyst has to see the alert, triage it, and escalate it before anyone responds.
Kysira
Detect, decide, and reset the TCP connection. The attacker sees their terminal die mid-payload.
One container. Zero code changes. Attacks stopped before your app sees them.
Put Kysira in front of your application and every request gets scored by a classifier in about 40 milliseconds. Hostile ones are cut off at the connection, so your application never runs a line of code for them.
Drop in as a proxy
One container in front of your app. No SDK, no code changes, no agent on your database. Works with anything that speaks HTTP.
Classify in about 40 ms
A compact, purpose-built classifier (not a regex set) reads the full request and returns a confidence score plus a human-readable reason.
Reset the connection
Above threshold, the TCP connection is severed. The attacker's tooling reports "connection reset by peer." Your application never saw the request.
What Kysira detects and blocks
Your WAF matches patterns.
We understand attacks.
Follow legitimate requests through Kysira and see where hostile traffic stops. Six classifiers, one verdict per request, in about 40 milliseconds.
Select a shield to explore how each attack is stopped before it reaches your application.
Illustration, not live monitoring. All requests from Users, Customers, Partners pass through Argus AI first. After inspection, allowed traffic continues to the protected application. Hostile traffic branches to the blocked outcomes: SQL Injection, Cross-Site Scripting, Command Injection, Prompt Injection, Path Traversal, SSRF.
Every request passes through Kysira. Only allowed traffic reaches your application.
The scan finds the open doors. Kysira is what stands in them.
The scan is free and it ends there: you get the findings whether or not we ever speak. But knowing what is exposed is only half of the problem. Kysira is the reverse proxy that sits in front of your application and scores every request that arrives, so the doors the scan found end up guarded rather than just documented.
Start with the free Atlas scan
See what an automated attacker reaches first on your public surface. Less than 5 minutes, just your domain, nothing installed inside your perimeter.
Put Kysira to Work
One container, inline. Every request scored in roughly 40 milliseconds, and anything hostile severed before your application processes it.
Check our work before you trust it with your traffic.
You should not have to take a security vendor's word for anything. Everything below is public, no sales call required.
Public documentation
Quickstart, deployment models, detection architecture, observability, and a full API reference, all readable before you ever sign up.
docs.kysira.ai →A demo instance you can attack
A real proxy in front of a deliberately vulnerable app, open to the public. Fire real payloads at it and watch the verdicts land.
live.kysira.ai →Self-service sign-up
Create an account, get a license key, and run the container. No procurement gate between you and a shadow-mode deployment.
app.kysira.ai →A named team and a real company
Kysira Corporation, registered in Delaware, our team and a support address a human reads.
Meet the team →A public release history
Every proxy, inference, and model release, versioned and dated, with a short description of what shipped.
Release notes →Common questions
The things engineering teams ask us before they deploy. If yours is not here, the docs go deeper, or just ask us directly.
What's the false positive story?
Kysira ships in shadow mode by default, logging every decision and adding headers while requests still pass through. Operators run it for a week, review the would-have-killed events, then flip a single toggle to active. False positives become observable before they become incidents.
What attack classes does it cover?
Kysira covers the common OWASP attack classes: SQL injection, cross-site scripting, command injection, SSRF, prompt injection, credential stuffing, and more, each with a classifier built for that threat. Because those classifiers read what a request is trying to do instead of matching known strings, new variants get caught too, not only the ones already on a signature list.
Why is this different from a WAF like Cloudflare or AWS WAF?
WAFs like those are rule engines. They match patterns. Kysira's classifiers read the structure of an attack, so obfuscation, re-encoding, or new phrasing doesn't slip past them the way it slips past a rule. Every decision also comes with a reason you can read, which a regex can't give you.
How does the latency stay under 100ms with a model in the request path?
We use compact, purpose-built classifiers (not a general-purpose LLM), quantized and baked into the container image so there's no cold start. They run on CPU; no GPU required. The proxy and inference sidecar communicate over loopback, adding under a millisecond. Total budget end-to-end: well under 100ms on commodity hardware.
What about encrypted traffic?
Kysira terminates TLS at the proxy (or runs behind your existing TLS terminator like Caddy or Cloudflare). It only inspects what your application would have seen anyway. No novel decryption required.
What happens if Kysira goes down?
The proxy is fail-open. If the classifier is unreachable or exceeds its latency budget, the request passes through unmodified. A Kysira outage degrades your protection; it never takes your application offline.
See an attack die in under 100 milliseconds.
The fastest way to understand Kysira is to watch it work. No account, no sales call: the live monitor is open to anyone.
Interactive demo
A public, always-on sandbox running a deliberately vulnerable web app behind a real Kysira proxy. Every request that hits it is scored in front of you, with the model’s confidence and the reason it made the call.
- Per-request score, verdict, and latency
- Human-readable reason for every decision
- Throw your own payload at it, no account required
Your account and deployments
Create a company account in one step, invite your team, and issue license keys for each proxy you deploy. Everything a running install needs (keys, image access, certificates) is managed from the same console.
- Company account with role-based team access
- License keys per environment or per cluster
- Container registry access and agent certificates
- Ingest logs so you can confirm telemetry is flowing
Documentation that gets you running
Full public docs covering quickstart, licensing, deployment models, detection architecture, observability, the API reference, and troubleshooting. No sales call required to read how it works.
- Quickstart for proxy, sidecar, and gRPC filter deployments
- Detection architecture and how scoring is done
- API reference and observability/metrics wiring