Impart Security
San Francisco API and application security vendor built by former CDN and WAF engineers, offering runtime enforcement across APIs and, increasingly, LLM and AI-agent traffic including MCP connections.
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Impart Security is an application and API security vendor founded in 2021 by a team with backgrounds building CDN and WAF infrastructure, headquartered in San Francisco. Its core product is a runtime enforcement platform that inspects and blocks malicious traffic inline across web applications and APIs, positioned as a modern successor to traditional WAF deployments that struggle with API-heavy, microservices-based architectures.
The company has extended its runtime enforcement approach into AI-specific attack surfaces, adding sequence-aware protection for LLM endpoints, stateful evaluation of autonomous agent behavior, and controls for the Model Context Protocol (MCP), the emerging standard for connecting AI agents to external tools and data. This puts Impart in the newer category of vendors trying to apply API/WAF-style enforcement discipline to generative AI and agentic systems rather than treating them as an unmonitored extension of the API surface.
Impart raised a $12 million Series A in June 2025 led by Madrona, with participation from CRV and 8-Bit Capital, and counts customers including FanDuel, Fanatics and Chipotle. For CISOs and AppSec teams whose API and AI-agent traffic already outpaces what legacy WAFs can meaningfully inspect, Impart offers a single runtime enforcement layer spanning both; its main risk is competing in an increasingly crowded field of AI-security and API-security entrants racing toward the same MCP and agent-protection use cases.
Innovation Matrix Assessment
Expanded from core WAF/API runtime enforcement into LLM protection, agent behavior evaluation and MCP-specific controls within a few years of founding, indicating rapid product expansion tracking a fast-moving threat surface.
Named enterprise customers (FanDuel, Fanatics, Chipotle, mParticle) and a Series A raise suggest a functioning enterprise sales motion, but the company remains small and early in its scale-up.
A $12M Series A closed in June 2025, led by a recognized enterprise security investor (Madrona) with additional participation from CRV and 8-Bit Capital, is a concrete, independently reported momentum signal.
Applying runtime, inline enforcement discipline built for WAF/API traffic to LLM endpoints, autonomous agents, and MCP connections addresses a genuinely new and largely unsolved attack surface rather than repackaging existing API security features.
Customer logos and testimonials are presented on the company's own site; no independent third-party test or benchmark of detection/blocking efficacy for the AI-specific protections was found.
API security and, increasingly, AI-agent/MCP security are both active, fast-growing buyer priorities as enterprises expose more APIs and adopt agentic AI systems, keeping Impart's positioning timely.
Why CISOs Should Care
AppSec and platform security teams whose API traffic has outgrown legacy WAF coverage, and who are now also exposing LLM and agentic AI endpoints, get one runtime enforcement layer instead of stitching together separate API security and emerging AI-security point tools.
What Makes It Different
Extends a CDN/WAF engineering background into sequence-aware, stateful runtime protection purpose-built for LLM endpoints, autonomous agents, and Model Context Protocol connections, rather than bolting AI features onto a traditional API gateway.
The Matrix Verdict
62/100 — INCREMENTAL INNOVATOR
An early but well-capitalized and technically credible entrant applying proven WAF/API runtime-enforcement discipline to the emerging AI-agent attack surface; genuine differentiation today, but the AI-security runtime category is filling with well-funded competitors making the same bet.
Editorial Note: Claims vs. Verified Findings
The $12M Series A, lead investor (Madrona) and participating investors (CRV, 8-Bit Capital) are corroborated across BusinessWire, Security Boulevard, and Madrona's own investment post. Customer names (FanDuel, Fanatics, Chipotle, mParticle) are company-stated on Impart's own site and were not independently verified with each customer.
Sources
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