Prosopo is a bot-protection platform whose CAPTCHA widget is branded Procaptcha, operated by Prosopo Limited from London. The product goes wider than a challenge widget: invisible verification with a challenge fallback, a built-in honeypot, known-abusive-network blocking, disposable-email filtering on the free tier, then bot risk scores exposed to your application, device and context-aware detection, IP reputation and location rules, VPN, proxy and datacentre traffic filtering, analytics and custom theming on the paid tier. There are integrations for WordPress and its plugin ecosystem, and migration comparisons against reCAPTCHA, hCaptcha, Cloudflare Turnstile and Friendly Captcha.
For this directory the interesting thing is the paperwork. Prosopo publishes a data processing agreement as a readable page, no login and no email request, and clause 5 of that agreement lists its current sub-processors by name: Contabo, Hetzner, OVHcloud, Bunny, AWS, Cloudflare for DNS resolution, and Hostwinds. Nobody else in this category exposes their infrastructure chain that plainly, and the list is worth reading closely rather than just crediting: four of the seven are EU-incorporated, and three, AWS, Cloudflare and Hostwinds, are US-owned and sit in the serving path rather than in billing. The service-user policy describes hosting as dedicated EU-based data centres with edge distribution worldwide, routing each request to a nearby data centre, so European residency is the design intent while the edge is global: Material.
The operator is UK, not EU, which is why the ownership signal here reads as other rather than EU-owned; UK adequacy currently covers transfers, but it is a political decision subject to periodic renewal rather than a structural guarantee. Pricing is the friendliest in the category: a genuinely free tier with 10,000 requests a month and one protected site, then a Professional plan with up to 1 million requests, 50 sites and a 30-day free trial, then custom Enterprise; prices are shown in USD, EUR or GBP in the app rather than as a fixed figure on the page. Best fit: teams that want to see the whole chain before committing, and small sites that need free rather than trial.