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Sendo

DefunctYC W22

New York City, US · Founded 2022 · 1 employees · 15 known investors

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Sendo provides an SMS and RCS API for startups, offering lower pricing than competitors and faster deployment for text messaging features. The platform includes developer documentation, monitoring tools, and simplified 10DLC regulatory compliance.

Also known as Winno

Developer ToolsEnterprise SoftwareMessagingAPISMSUnited States of AmericaAmerica / CanadaFully Remote

Founders & leadership· Y Combinator alumni (W22)

Sendo was founded in 2022 by Nick Rubin and Daniel Lewis.

NRNick Rubin
Nick RubinFounderNick Rubin studied at Stanford (class of 2021) and has developed software projects ranging from browser extensions to cryptocurrency applications and retail automation tools.
DLDaniel Lewis
Daniel LewisFounderDaniel Lewis graduated from Tufts University in 2020 and is building tools for creators to monetize their expertise and insights.

Investors · 15

BEENEXTreportedSingapore

How we know: prnewswire.com · Not right? Tell us

BEENOSreportedTokyo

How we know: prnewswire.com · Not right? Tell us

Commerce VenturesreportedSan Francisco · $1M – $5M

How we know: Y Combinator's founder network · Not right? Tell us

Daiwa PI PartnersreportedTokyo

How we know: prnewswire.com · Not right? Tell us

Goodwater CapitalreportedBurlingame · $5M – $50M

How we know: Y Combinator's founder network · Not right? Tell us

Hard YakareportedMuir Beach

How we know: Y Combinator's founder network · Not right? Tell us

Meron CapitalreportedTel Aviv

How we know: Y Combinator's founder network · Not right? Tell us

SBI HoldingsreportedTokyo

How we know: extruct.ai · Not right? Tell us

Twenty Two VenturesreportedPalo Alto · $50K – $250K

How we know: Y Combinator's founder network · Not right? Tell us

Also in the syndicate · 5

eContext AsiaFPT GroupSBI GroupleadSKS VenturesSoftBank Ventures Korea

Funding

SEC filings, press & company announcements

Source: company announcements and press reports — follow each round's link for the claim.

Related companies · 6

Zendesk New YorkThis is Zendesk's internal belonging/diversity and inclusion program page, not a company profile page for an external company. It describes Zendesk's internal culture initiatives and leadership development programs.
SmobiSmobi is an AI-powered messaging platform that enables brands to send interactive RCS (Rich Communication Services) and SMS campaigns directly to customers' phones. The platform offers drag-and-drop campaign builders, AI-powered customer service agents, product card carousels, and event booking capabilities, designed for ecommerce, customer engagement, and customer support use cases.
PinnaclePinnacle provides an API for sending RCS, SMS, MMS, and iMessage messages with features like rich cards, carousels, and quick replies. The platform serves businesses of all sizes that need to send marketing campaigns, transactional alerts, and customer conversations at scale.
TermiiTermii provides infrastructure that uses AI to ensure critical transactions—including authentication, payments, checkouts, and fraud notifications—complete successfully, serving banks, fintech companies, e-commerce platforms, and other digital services globally.
AptenApten builds AI agents that automate student enrollment workflows for educational institutions across SMS, phone, email, and web channels. The platform manages student communications throughout their lifecycle—from prospecting to re-engagement—while maintaining conversation context across all touchpoints and integrating with existing CRM and admissions systems.
HiveHive provides marketing and event management software for live event promoters, helping clients send over 2.5 billion emails annually.

Companies working in the same space as Sendo.

In the news

Sendo Joint Stock Company Funding | $750M Revenue | Complete Analysis | Extruct AIextruct.ai · Dec 2014

Frequently asked questions

What does Sendo do?
Sendo provides an SMS and RCS API for startups, offering lower pricing than competitors and faster deployment for text messaging features. The platform includes developer documentation, monitoring tools, and simplified 10DLC regulatory compliance.
Who founded Sendo?
Sendo was founded by Nick Rubin, Daniel Lewis in 2022.
Who are Sendo's investors?
Sendo's investors include Y Combinator, BEENEXT, BEENOS, Commerce Ventures, Daiwa PI Partners, Goodwater Capital, Hard Yaka, Meron Capital and 2 more.
Where is Sendo headquartered?
Sendo is headquartered in New York City, US.