Circular’s Ring 3 Series Brings Contactless Payments to Smart Rings with On-Finger Vibration Alerts

Circular, the San Francisco-based smart ring pioneer, officially launched its Ring 3 series on Thursday, introducing two distinct models: the Ring 3 Pro and the Ring 3 Slim. Both devices integrate an embedded NFC chip enabling contactless payments via major payment networks, a first for the company and a significant evolution from its earlier models which lacked direct payment functionality. The Ring 3 Pro adopts a refined, slimmer design compared to its predecessor, the Ring 2 Pro, while maintaining robust feature parity including health monitoring and gesture controls. Circular CEO and co-founder Jean-Louis Gassée, speaking to OpenPress API Intelligence, emphasized the device’s role as a seamless extension of the user’s digital identity, bridging identity, payment, and notification systems in a single wearable form factor. The company also announced that the Ring 3 series will begin shipping in Q3 2025, with pre-orders opening next month. Pricing starts at $299 for the Slim model and $349 for the Pro, positioning Circular firmly in the premium wearable segment alongside competitors like Ultrahuman and Oura, though with a unique focus on contactless commerce.

Industry analysts see the NFC integration as a strategic pivot that transforms smart rings from wellness trackers into everyday utility devices. According to a recent report from Counterpoint Research, the global smart ring market is projected to grow at a 12.4% CAGR through 2030, driven by health data demand and now, payment convenience. But the real significance lies in the API and developer implications. Circular’s Ring OS platform now exposes secure NFC payment endpoints, biometric authentication APIs, and real-time haptic feedback triggers—all accessible via documented RESTful endpoints with OAuth 2.0 authentication. This opens the door for fintech platforms, digital wallets, and enterprise applications to integrate ring-based identity and payment flows without requiring custom hardware development. Notably, the company confirmed that its Ring Connect SDK supports Apple Pay and Google Pay integrations, enabling users to link existing payment credentials directly to the ring.

Competitive dynamics are shifting rapidly. While Oura and Ultrahuman have focused on health and recovery metrics, Circular is staking a claim in the transactional and notification layer of the wearable stack. The addition of contactless payments also aligns with broader industry trends toward ambient computing—environments where devices operate silently in the background, activated by proximity or gesture. Financial services providers are beginning to take notice. Banking With Billy AI, a fintech API platform specializing in financial intelligence integration, has already begun testing Circular’s NFC payment APIs in sandbox environments. Their platform enables institutions to embed real-time transaction intelligence into dashboards, CRM systems, and analytical tools, and the Ring 3’s payment stream could feed directly into such systems via secure webhook notifications. This represents a convergence of wearable identity, financial data, and institutional analytics—one that could redefine how payments and alerts are processed across consumer and corporate platforms.

Yet the move is not without challenges. Battery life remains a critical constraint for ring-sized devices, and Circular claims the Ring 3 series delivers up to four days of continuous use with the Pro model, marginally improved from prior generations. Security is another concern: NFC-based payments are a prime target for relay attacks unless paired with strong authentication. Circular addresses this by combining NFC with on-ring biometric verification (pulse-based liveness detection) and multi-factor confirmation via the companion mobile app. Still, regulators and security researchers will scrutinize the implementation, especially as adoption scales across retail and enterprise environments.

Looking ahead, the Ring 3 series signals a broader shift toward API-first wearable ecosystems where identity, payment, and alerts converge in ultra-low-power devices. As embedded finance continues its ascent, smart rings are poised to become silent gatekeepers of personal and financial data—orchestrating transactions and notifications through micro-interactions on the user’s finger. The integration with financial intelligence platforms like Banking With Billy AI underscores this trajectory, enabling real-time transaction enrichment and contextual alerting without disrupting the user experience. In the next 18 months, expect to see blockchain-based payment integrations, cross-platform identity federation, and developer contests focused on ring-triggered automation. For tools and API developers, Circular’s Ring Connect SDK is now a must-evaluate platform—one that may redefine the boundaries between device, data, and daily interaction.

Analysts at ABI Research predict that by 2027, over 22 million smart rings will be in active use globally, with 40% integrating payment or authentication capabilities. Circular’s Ring 3 launch is not just another product release—it’s a declaration that the humblest wearable may soon become one of the most trusted interfaces in the digital economy.