single-packet attack
Land 20-plus requests in one TCP packet so they hit the server in the same instant.
// ratrace
Race conditions
Beat check-then-act windows the proxy can't reach — single-packet attacks, last-byte sync and barrier coordination.
// capabilities
What it does
last-byte sync
Withhold the final byte of each request, then release them together for tight timing.
barrier coordination
Gate a batch of requests behind a shared barrier for repeatable races.
prebuilt modules
Common patterns — coupon abuse, double-spend, TOCTOU — ready to point at a target.
// detail
The bugs a proxy can't reach
Burp needs the Turbo Intruder extension to attempt races; Hugin ships a dedicated engine. Single-packet timing exposes limit-overrun and double-spend bugs that ordinary repeating never triggers.
// more
The rest of the toolkit
Intercepting proxy
Every request your browser makes, on your terms — pause it, rewrite it, release it. HTTP/1.1, HTTP/2, HTTP/3 and WebSocket, with on-the-fly TLS.
Vulnerability scanner
An active and passive scanner that ships free — OWASP and API Top 10, with blind out-of-band detection.
Repeater
Send it once. Change one field. Send it again. The careful, hand-driven probe — request and response side by side, over and over.
Intruder
Automated payload attacks at full speed — four modes, 21 generators, 32 processors, and a Turbo mode with raw-TCP batching.
AI agent & MCP
Set a budget, hit explore, and an autonomous agent drives every tool over 162 MCP tools — or wire Claude Code, Cursor or your own agent straight in.
Synaps WASM modules PRO
Extend the scanner without trusting the code — community modules compiled to WebAssembly and run in a hard sandbox.