Blackwall, an Estonia-based maker of web traffic security tools for hosting providers, said Tuesday it has raised $100 million in a Series C round at a $2.2 billion valuation. The company sells products that help websites handle surging volumes of bot traffic, including AI agents. The round was led by AVP, with existing investors Dawn Capital, MMC Ventures and Tera Ventures participating.
Executive chairman Roi Carthy said the new financing lifted Blackwall's valuation fourfold compared with its previous fundraise in 2025. The company is positioning itself in a crowded field of web infrastructure providers, including Cloudflare, Akamai and Imperva, that defend sites against DDoS attacks, scraping, botnet farms and malicious requests, as well as rogue AI agents.
Blackwall is not pursuing those larger rivals head-on. Rather than selling directly to websites, it sells through web hosting, managed service and cloud providers, giving them a bundle of tools they can customize and offer to their own clients under their own branding while keeping control of the customer relationship. Co-founder and CEO Nikita Rozenberg said hosting companies can mix and match security components, set their own prices and share a portion of the revenue with Blackwall. Customers start on a free tier that shows the traffic and threats hitting their networks, and pay for protection and other tools.
The platform provides threat intelligence, certificate management, DDoS protection and traffic routing. It also inspects customer traffic to separate genuine visitors and legitimate AI agents from malicious bots and disruptive requests. Rozenberg said Blackwall uses techniques such as digital fingerprinting to identify the software sending a request, citing Microsoft Office and Codex as examples, and runs its own AI models at customer endpoints to assess the intent and behavior behind incoming requests.
Rozenberg sees a significant opportunity as AI agents increasingly interact and transact with websites on behalf of users, which he expects will eventually require systems to manage which agents get access, on what terms, and how they are authorized to make payments. Cloudflare's AI Crawl Control already lets site owners allow or block individual AI crawlers and optionally charge them for access. Rozenberg argues Blackwall's advantage is that hosting providers can offer such traffic management themselves instead of ceding the customer relationship to another security provider.
Blackwall plans to use the funding to expand across North America, Europe, Asia-Pacific and the Middle East, and to develop more security tooling for hosting, cloud and managed service providers.
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