Every CX start-up funding deal you need to know: October 9

Every week, CX Network publishes a round-up of funding news from CX and customer service start-ups. 

With details of how much has been raised and who backed the round, it gives leaders and practitioners an overview of the latest capabilities in the vendor market, who the biggest new players are and how they can solve long-standing challenges with new solutions.

With a strong focus on Series As and AI agents, this week's bulletin covers:

• Siena raises $17m to build more autonomous AI agents for customer service 
• OuterSignal raises $22m to make customers feel like individuals – including Kim Kardashian
• OneByZero raises $20m Series A to take its FDE model to Japan
• Ampersand AI raises $15m to put agentic applications in legacy systems 
• Deepslate's Seed round raises €7.7m for training-data program and product quality 
• Relay raises $36m to help businesses capture intelligence from the frontline

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Siena raises $17m to build more autonomous AI agents for customer service 

New York-based Siena raised US$17 million in its Series A round, led by York IE and supported by Joyance Ventures and previous investors Aglaé Ventures and Sierra Ventures. 

Siena is developing AI agents that handle customer service, shopping, and social media interactions for consumer brands and said it will use the new funds to build more autonomous agents and expand the infrastructure consumer brands use to serve customers and grow revenue.

Co-founder and president Lisa Popovici said: "Support, shopping and social may be different departments inside a company. To the customer, they're one relationship." 

Co-founder and CEO Andrei Negrau added: "We started by helping brands take care of their customers. Today, brands use Siena to help customers buy and guide decisions across the business. When an agent learns why someone buys or leaves, that understanding should travel with the customer and reach the people running the brand. The same understanding that helps an agent resolve a conversation can help a founder decide what to build next. Our ambition is for agents to manage the entire customer journey with that context"

Siena automates up to 80 percent of customer interactions and says it already serves "hundreds of consumer brands" including FIGS, SPANX, Comfrt and HexClad. Some of its public results include: 

Eskiin's Social Agent lifting weekly comment engagement by 50 percent, freeing up 15 hours a week for its social lead. Coterie using Ask Siena to turn a customer-analysis project that used to take weeks into a 10-minute query. SPANX, using Siena Intelligence to trace to reason for a spike in shipping complaint. The tool found a single carrier issue was affecting nearly every delivery in one region.

OuterSignal raises $22m to make customers feel like individuals 

OuterSignal raised $22 million in its Series A led by Long Journey Ventures and Abstract Ventures, with participation from BAM Ventures, Top Shelf Ventures, SuperAngel.Fund, AME Cloud Ventures, OpenSky and Family Fund, plus dozens of angels and executives from its own customer base.

The New York-based start-up claims to have finally cracked the personalization issue that has long plagued CX and marketing: it takes more than an email with the customer's name in it to build a true connection. 
OuterSignal connects to an organization's CRM or commerce platform and provides the full profile behind every customer, for example age, occupation, education, interests, family, hobbies and social presence, not just name and purchase history. 

But it's more than just data. OuterSignal flags when it detects a purchase from an influencer or celebrity and it can build audiences on any persona or behavior, meaning college students, grandparents, and busy executives each get their own flows and campaigns. It can then push segments to media buying platforms and run ads written for specific identifiers, such as a person's profession or age group. 
It can also allow users to see the demographics, psychographics and behavior behind every SKU and category. 

Since its launch in January 2026, OuterSignal has picked up Mizzen+Main, Gratsi and Magic Mind as customers. In the case of Magic Mind, OuterSignal says its VIP detection software identified Kim Kardashian had been a customer for two years. This led to a special package being delivered, which then featured in Kardashian's Instagram Story. 

OneByZero raises $20m Series A to take its FDE model to Japan

Singapore-based OneByZero raised US$20 million in its Series A round led by Jungle Ventures.

The start-up integrates AI into existing systems and workflows and already operates in nine markets, Australia, India, Indonesia, Malaysia, the Philippines, Singapore, Thailand, the United States and Vietnam. According to report, it will use the capital boost to build a local team in Japan and develop AI agents and its NEO platform, an AWS professional services offering that helps customers adopt, deploy and manage generative AI solutions on AWS. 

The OneByZero business model is based on a team of forward-deployed engineers, who work inside client organizations in highly regulated industries to build AI into existing systems, then help manage and improve the systems. NEO runs and governs AI agents as automated tools with defined roles and controls, creating a hybrid workforce, rather than swapping human  resources for AI. 

It's a costly model, but analysts say the expansion into Japan will prove the strength of this people-heavy proposition to other markets. This is because Japan is one of the most compliance-focused markets in the world, meaning clients see OneByZero's governance layer as a long-term investment. 

Ampersand AI raises $15m to put agentic applications in legacy systems

Ampersand AI's Series A round raised $15 million led by Bessemer Venture Partners and supported by new investors Yelp, Tenacity Capital, CTO Fund and Mana Ventures as well as previous investors Matrix and Flex Capital.

The San Francisco start-up allows agentic applications to read and write inside the CRM, ERP, and other systems of record that power enterprises. 

It's far from the only start-up to address the obstacles emerging around legacy systems of record. Last month, Lightfield confirmed a $47 million Series A. Its CRM builds a comprehensive record from every customer interaction, captured as it happens, and structured so agents can understand what is true and predict what happens next.

Ampersand AI's approach to legacy systems isn't about replacement, but bridging legacy and agentic platforms. 

"We're in this fascinating moment where AI has the potential to transform the enterprise, but CTOs are still faced with the old problem of systems of record," said Ayan Barua, co-founder and CEO of Ampersand. "Our bet is that the 'saasapocalypse' is overstated and systems of record like Salesforce and NetSuite aren't going anywhere. Ampersand is designed to sit between these two generations of software and make them legible to each other."

Following the round, Lauri Moore, a partner at Bessemer, will join Ampersand's board.

Deepslate's Seed round raises €7.7m for training-data program and product quality

Deepslate raised €7.7 million in Seed funding, with 42CAP as the lead and Alstin Capital, SIVentures and several business angels also participating in the round.
Not to be confused with the stone in Minecraft, Deepslate is a native speech-to-speech model with no middleware. This means that while competitor voice agents utilize three systems – speech recognition converts audio to text, a language model produces an answer, and text-to-speech turns that answer back into audio – its  solution preserves cues such as emphasis and intonation while reducing the delay introduced by moving through separate models. 

With a focus on the European market, Deepslate's website lists 27 supported languages and says its model recorded 440 milliseconds of latency in an Artificial Analysis comparison. In layperson's terms, that means automated conversations can be responsive enough for live customer interactions.

As a German start-up targeting the EU, Deepslate's USP isn't restricted to model performance. It also allows clients to run on European cloud infrastructure or in their own environment. And Deepslate frames self-hosting and EU data residency as a route into regulated or sensitive workloads, rather than as a compliance layer added after the model is built.

The start-up says insurers, contact centers and software platforms already use the technology in production. 

Relay raises $36m to help businesses capture intelligence from the front line

Relay raised $36 million in an oversubscribed funding round from International Paper, with Cerity Partners Ventures, Thayer Investment Partners, and previous investors G2 Ventures and Wind River Ventures also participating.

Relay makes smart radios that use AI to turn front line workers' conversations into operational records. It claims its technology makes employees safer, better connected and empowered with the spoken intelligence of its workers. 

According to research it conducted among 500 manufacturing professionals, 57 percent say their most important operational communication happens out loud, in person. Only 17 percent said almost everything front line workers notice and flag ends up in a system, log, or formal report. 

Relay calls this signal evaporation and says it has a meaningful cost, with 79 percent of its survey respondents saying communication breakdowns cause delays, rework, or missed handoffs at least a few times a month.

"What makes this round special isn't simply the capital being raised – it's the alignment with leaders from the industries we serve on how Relay can help them digitally transform their physical operations," said Chris Chuang, CEO and co-founder of Relay. 

"International Paper understands Relay not just from an investor standpoint, but from the perspective of a customer witnessing the transformational value Relay delivers across its highly demanding industrial environments. Similarly, Thayer brings perspective from multiple leading hotel brands that already run Relay across thousands of properties. It's a powerful endorsement when customers aren't just buying your system but are also betting on the company behind it," Chuang added. 
However, there has been significant backlash against AI tools that can support employee monitoring in recent months. 

Quick links 

• Every CX start-up funding deal you need to know: October 2
  
• Every CX start-up funding deal you need to know: September 25
• Every CX start-up funding deal you need to know: September 18