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§ Private Profile · New York City, NY, USA
The best SMS/RCS API for startups
Sendo has raised $112.0M across 2 funding rounds.
Key people at Sendo.
Sendo was founded in 2022 by Nick Rubin (Founder).
Sendo has raised $112.0M in total across 2 funding rounds.
We're making it easy, cheap and fun for startups to build on SMS again. Sendo is the most developer-friendly SMS API, with great documentation, a fast dashboard, helpful monitoring features, easier 10DLC compliance and much more.
Save 40%+ compared to Twilio and other options, and get started sending messages in 1-2 days instead of waiting weeks for your 10DLC campaigns to get approved.
Key people at Sendo.
Sendo has raised $112.0M across 2 funding rounds. Most recently, it raised $61.0M Series C in November 2019.
| Date | Round | Lead Investors | Other Investors | Status |
|---|---|---|---|---|
| Nov 1, 2019 | $61M Series C | — | SBI VEN Capital, EV Growth, Kasikornbank Financial Conglomerate | Announced |
| Aug 1, 2018 | $51M Series B | SBI Group | SBI VEN Capital, Beenext, Beenos, Daiwa PI Partners, Econtext Asia, FPT Group, SKS Ventures, Softbank Ventures Asia | Announced |
Sendo was founded in 2022 by Nick Rubin (Founder).
Sendo has raised $112.0M in total across 2 funding rounds.
Sendo's investors include SBI Ven Capital, EV Growth, Kasikornbank Financial Conglomerate, SBI Group, Beenext, Beenos, Daiwa PI Partners, eContext Asia, FPT Group, SKS Ventures, SoftBank Ventures Asia.
Sendo is a startup offering the most developer-friendly SMS and RCS API tailored specifically for startups and developers. Its product simplifies SMS integration by providing excellent documentation, a fast and intuitive dashboard, helpful monitoring tools, and streamlined 10DLC compliance, enabling startups to send messages quickly and cost-effectively. Sendo serves developers and startups who need reliable, affordable, and easy-to-use messaging APIs to build communication features into their applications. By saving over 40% compared to competitors like Twilio and reducing campaign approval times from weeks to days, Sendo addresses the pain points of cost, complexity, and speed in SMS messaging for startups, fueling their growth momentum in the messaging API space[1][3][4].
Founded in 2022 by Nick Rubin, a Stanford graduate with a strong background in building tech products since his early teens, Sendo emerged from the need to make SMS integration easier and more accessible for startups. Rubin’s experience includes creating viral Chrome extensions, Ethereum prediction markets, and automation bots, reflecting a deep technical expertise and entrepreneurial spirit. The idea for Sendo was born from recognizing the cumbersome and expensive nature of existing SMS APIs, especially for smaller companies. Early traction came through acceptance into Y Combinator’s Winter 2022 batch, providing validation and support for the product’s market fit and developer-centric approach[1][5][6].
Sendo rides the growing trend of API-driven communication platforms that empower startups to embed messaging seamlessly into their products. The timing is crucial as SMS and RCS remain vital channels for user engagement, especially in sectors like fintech, e-commerce, and customer support. Market forces such as increasing demand for personalized, real-time communication and stricter carrier compliance requirements (like 10DLC) create a strong need for specialized, developer-friendly APIs. Sendo’s focus on speed, cost-efficiency, and compliance positions it well to influence how startups adopt messaging technology, potentially lowering barriers and accelerating innovation in the communication API ecosystem[1][2][7].
Looking ahead, Sendo is poised to expand its feature set and scale its user base by continuing to prioritize developer experience and cost leadership. Trends such as the rise of RCS (Rich Communication Services) as a successor to SMS, increasing regulatory complexity, and the growing importance of conversational commerce will shape its trajectory. As startups increasingly demand flexible, affordable messaging solutions, Sendo’s influence could grow beyond just an API provider to become a key enabler of startup communication infrastructure. Its YC backing and founder’s technical pedigree provide a strong foundation for sustained innovation and market penetration[1][3][7].
