Callr

Callr is an API-first voice and SMS platform that enables businesses to integrate real-time communication capabilities directly into their products, applications, and workflows. Built on carrier-grade infrastructure owned entirely by the company—not resold from third parties—Callr provides direct control over voice and messaging across more than 220 countries. The platform processes over 2.5 million calls daily and is used by more than 300 companies, including marketplaces like Bien’Ici, MeilleursAgents, and Paruvendu. At its core, Callr offers a single API that supports voice calls, SMS, and email, allowing developers to embed click-to-call buttons, SMS notifications, and AI-powered voice agents into their systems within days rather than months. The API can capture and attribute every inbound call, converting raw conversation data into structured, actionable insights. Each call event—such as duration, origin, outcome, and customer behavior—can be pushed automatically into CRM platforms, business intelligence tools, or analytics dashboards. This enables organizations to track lead sources, measure campaign performance, and trigger follow-up actions based on real-time voice interactions. One of Callr’s primary use cases is for online marketplaces and classifieds platforms. These platforms often rely on phone calls between buyers and sellers for lead generation and transaction completion. Callr’s API provides dynamic number masking, call routing, and advanced attribution to determine which listing, ad, or marketing channel generated each phone call. This helps marketplace operators understand conversion funnels, allocate advertising budgets more effectively, and improve user experience by connecting parties without revealing personal phone numbers. Beyond marketplaces, Ca