Sent raises $12m Series A for AI-native messaging infrastructure

Sent, a New York-based startup offering a single API for SMS, WhatsApp and RCS routing, has raised $12 million in an oversubscribed Series A led by Companyon Ventures. Bessemer Venture Partners, Urban Innovation Fund and CP Overture also participated, with all three returning from earlier rounds. Angel investors from Clay, Eleven Labs and Attentive backed the company at pre-seed stage.

The round marks a shift in Sent's positioning: the company is no longer describing itself as a developer tool sitting atop carrier networks, but as a licensed telecom carrier in its own right. Sent received its FCC designation as a US carrier prior to this raise, a move the company's founders say gives it direct number allocation rights and technical parity with legacy incumbents such as Twilio, Sinch and Infobip.

What Sent actually does

Sent's platform inspects inbound message traffic in real time and determines both which channels are technically reachable for a given phone number and which channel that recipient actually uses. Messages are then routed accordingly across SMS, WhatsApp or RCS through the company's relationships with more than 75 carriers, covering a claimed one billion unique phone numbers.

The company reports 99.9% uptime, end-to-end delivery latency typically under 200 milliseconds, and cost reductions of 70 to 80 per cent against SMS-only approaches for its customers. More than 20,000 developer teams are said to be routing traffic through the platform. Named customers include TrimRX, ITM Studio and ITNIO Tech, all described as having migrated away from Twilio. Sent holds SOC 2 Type 2 certification and handles compliance obligations including TCR and 10DLC registration automatically.

Co-founder and CEO Daniel Vataj framed the investment around the anticipated growth of AI-initiated messaging: "AI agents will soon send more business messages than people do, and the infrastructure beneath them is not ready. Sent reverses that model: tell us who you need to reach, and our platform determines where they are reachable, routes the message through the right channel, and handles the compliance and carrier complexity underneath it."

Market context and competitive read

The application-to-person (A2P) messaging market is valued by Sent at approximately $100 billion globally. The major incumbents, Twilio, Sinch, Infobip and MessageBird, built their stacks around SMS as the default channel at a time when it commanded near-universal reach. Sent cites its own figure that only 13 per cent of consumers now use SMS as their primary messaging channel, a structural shift the incumbents have been slow to address through unified channel abstraction.

The Stripe and Plaid comparisons Sent draws are instructive: both companies pursued regulatory infrastructure status (payments processing and open-banking data access respectively) as a mechanism for deepening competitive moats beyond pure developer experience. Sent's FCC carrier licence attempts the same manoeuvre in communications. Whether it translates into comparable defensibility will depend on how quickly Twilio and others build equivalent multi-channel routing natively, rather than via bolt-on partnerships.

Regulatory and standards considerations

FCC carrier status brings Sent under US telecommunications regulation, including STIR/SHAKEN caller authentication rules and Telephone Consumer Protection Act obligations. For enterprise customers, having a single vendor that holds carrier-level compliance responsibility rather than acting as a pass-through aggregator could simplify legal exposure, particularly as AI-driven messaging volumes scale. The company's MCP-compatible tooling for agent developers also positions it for the emerging standards landscape around agentic AI workflows, though no formal standards body has yet ratified an MCP specification at carrier grade.

Funds from the Series A will be directed at expanding Sent's direct carrier network, deepening agent-facing infrastructure capabilities, and growing engineering and enterprise go-to-market headcount. The company has not disclosed a post-money valuation or near-term revenue targets.