MCP Prompt Firewall

Sub-millisecond deterministic prompt injection protection for AI apps

Problem

AI apps lack a fast, predictable defense against prompt injection. A developer showcased a <0.1ms deterministic prompt firewall, showing real interest in this space.

Solution

A lightweight MCP service that matches rules and signatures before requests reach the model, blocks known attack patterns, and explains why a request was blocked or allowed.

Users

SaaS developers adding AI security layers, individual developers building MCP tools, and small team security leads

MVP

Expose an MCP interface; built-in common prompt injection rule set; sub-1ms local matching; block logs with rule hit details; custom rule import

Revenue

Open-source base rules with a paid subscription for advanced rule libraries and team policy management

Why now

The MCP ecosystem is exploding, and prompt security is a problem every integrator faces without a standard solution—well suited for a solo developer to validate quickly.