Rob Sioss

dad, husband, sports enthusiast, beer lover. engineering @Stedi (formerly @GremlinInc, @SASsoftware)

[Zack Kanter @zackkanter]

Very excited to announce @Stedi's official app in @OpenAI's @ChatGPTapp store. It's the first native integration that allows providers to check patient insurance eligibility right from within their own ChatGPT account.

It was great to work with OpenAI's team to navigate the complex requirements for bringing this information into the ChatGPT experience. We are huge believers in the 'bring your own AI' idea – over the coming months, we'll be incorporating more and more of Stedi's revenue cycle APIs into the ChatGPT app.

The Stedi ChatGPT app is built using our MCP server, so you can replicate the same experience in your own agentic workflows using Stedi's MCP and APIs directly – we've worked with hundreds of healthtech and traditional software providers to do just that.

The full blog announcement with more details is in the replies.

[Zack Kanter @zackkanter]

I'm thrilled to announce @Stedi's $50m Series C, led by Lee Fixel from Addition with participation from @Stripe, @RibbitCapital, @USV, @FirstRound, @BoxGroup, and @BloombergBeta, along with angel investors including @tobi, Charlie Songhurst, @rauchg, @karimatiyeh, @Max, and more. This latest round brings our total funding to $142 million.

We’ve grown enormously over the past year. Our number of paying customers has increased by 6x year over year, and our number of billed transactions has increased by over 7x. We’re now processing more than a billion claims and eligibility transactions annually – to frame this on a relative basis, we processed more transactions in February alone than we did in the first half of 2025 combined. This month, Stedi was named one of @TryRamp's fastest-growing vendors – across all categories, not just healthcare – for the second time in ten months; we’re the first non-AI company to make the list in five months.

We’ve done all this while offering a level of support that (allegedly) doesn’t scale. We offer dedicated Slack and Teams channels to every customer and now have over 1,500 shared channels. Over the past 12 months, our median support ticket response time has decreased from 18.3 minutes to just 6.7 minutes, all while handling a 6.4x increase in support volume – with 100% of tickets answered by humans.

Our customers send us thousands and thousands of questions and suggestions every month, day and night, and the learnings we get from this firehose of real-time feedback are the engine that turns our business. It is this process that has made us the fastest-growing clearinghouse by a wide margin.

This latest round of funding allows us to continue to accelerate development across our platform and to continue to serve customers with a first-rate support experience.

One key to that is continuing to build a world-class team – to that end, we are hiring for dozens of roles across engineering, product, design, operations, GTM, and more. If building the transactional layer for the future of healthcare sounds interesting to you, drop me a note.

[Zack Kanter @zackkanter]

The @TryRamp top vendors list is our favorite list to be on because it's one of the few 'real' benchmarks out there. This is our second time on it. A year ago, it was @Stedi alongside a bunch of other SaaS and a few AI companies. Now, we're the first non-AI company to be on the list in 5 months.

There is still an enormous market for API-first, network-based SaaS – agents need efficient and reliable ways of connecting to the otherwise-illegible real world (in our case, we handle connectivity to 3,500+ different healthcare insurance companies for claims processing) – but building a defensible business in these categories is a huge investment of time and capital. Nine years in, we're growing faster than ever. We're hiring across many roles – engineering, design, product, GTM, legal, ops, recruiting, and more. If you're looking to be a part of something special for the long term, drop me a note.

[Zack Kanter @zackkanter]

Had a great time at @AWSEvents re:Invent talking about the @Stedi agent. We built and launched the first version in <2 weeks using Bedrock AgentCore – from talking to other founders, it seems that AgentCore is one of the best kept secrets in software (hopefully not for long).

[Zack Kanter @zackkanter]

You can read the full announcement on our blog, but I thought I'd editorialize a bit more here and tell more of the backstory of what happened over the past 18 months.

In late Feb 2024, I brought our engineering team into a war room. Change Healthcare – the nation's largest clearinghouse for processing healthcare claims between providers and insurance companies – had been down for almost a week due to a cyberattack that would ultimately take them out for 2 months.

It’s hard to explain the magnitude of the outage to people outside the healthcare industry. Nearly 40% of healthcare claims processed in the United States flowed through Change’s platform. They processed an aggregate $1.5 trillion of claims volume annually – 15 billion claims in total. Healthcare spend in the US is $4.9 trillion annually – 18% of total GDP – which means that when Change went down, it was processing roughly *5.5% of US GDP*.

We worked around the clock to launch our drop-in replacement for their clearinghouse, which we did 5 days later. We were in the right place at the right time, but so were a lot of other people – this didn't exactly happen in private. We were able to do this because we had spent the previous 6 years building the underpinnings of a platform that could power a clearinghouse.

It's funny because by February 2024, we had what we thought was product market fit – our EDI processing platform was used across retail, logistics, healthcare, and more. We had plenty of customers, but even with all of the work that we had put in to make our EDI processing platform easy to use, it still took weeks or months for companies to get up and running, because each connection had to be set up one-by-one. Customers were willing to put in the work, but it was still a far cry from what I had set out to do from the earliest days.

I always loved Uber's original mission statement: 'To provide transportation as reliable as running water, everywhere, for everyone' (its current mission statement – 'To reimagine the way the world moves for the better'– is watered down corporate nonsense). My goal was similar: to make business-to-business transactions as reliable as running water.

In our January board meeting, I said that our plan for the back half of 2024 was to finally move another level 'up the stack' and to offer turnkey transaction functionality in healthcare – the only place where it's currently possible to do so, thanks to regulatory-enforced transaction schemas and robust network of interconnectivity – by building a clearinghouse.

It became clear a few days into the outage that Change wasn't coming back online anytime soon, or perhaps ever. We accelerated our plans and launched over the weekend.

It was pandemonium. For the seven weeks after launch, I couldn't leave my keyboard for more than five minutes at a time – most days from 4:30 or 5am until midnight. Six/seven figure deals went from initial phone call or text message to signed terms in under an hour. A couple of weeks in, I went for a quick walk to get outside, and took three phone calls from CEOs and CTOs who were desperate to get back online. We sent people to their offices and had them integrated and processing claims within hours.

It's strange to tell this story now because our world was almost entirely about the Change Healthcare outage for a couple of months last year, and we've hardly thought about it since. They eventually came back online and the dust settled. None of our customers who signed and went live switched back. But at the same time, Change stopped hemorrhaging customers – the companies who were going to jump ship, jumped ship.

Yet our growth has only accelerated. Last month, we signed 5x the number of customers that we signed at the height of the Change outage. Stedi has become the de facto choice for virtually every new venture-backed health tech company – and as later-stage health tech companies and traditional institutions revisit their legacy clearinghouse dependencies in the wake of the Change outage, Stedi’s cloud-native, API-first platform has become the obvious choice.

But more and more, our growth is driven by GenAI use cases from all segments of the market – from brand new startups to traditional companies coming to Stedi to build agentic functionality into their existing platform. One-third of our customer base is now made up of fully-native GenAI companies.

Development teams hit frustrating roadblocks with legacy clearinghouses. The legacy clearinghouses were built pre-cloud computing (and in many cases, pre-internet), and most are the result of a series of private equity acquisitions with tech stacks that were never harmonized or modernized. They offer only the bare minimum of hopelessly outdated APIs – most of the functionality offered by legacy clearinghouses is not accessible programmatically.

Stedi’s approach is API-first: every piece of functionality available through our user interface is available via API. Our thesis is simple: as more and more aspects of software are subsumed by agentic workflows, companies will shift ever-greater portions of their workloads to the platforms that offer the best accessibility and legibility to AI agents that are performing actions; since other clearinghouses don’t offer ways to perform tasks programmatically, customers will continue to migrate to Stedi as they build net-new workflows, or as they find that existing workflows come to exceed the requirements afforded by other clearinghouses.

We have a single question that we use to guide our roadmap decisions: does this make it easier for humans and agents to interact with our platform? This has dozens of small improvements alongside bigger launches – notably our MCP server last week and our own native agent yesterday.

Venture capital is a wonderful thing – it would not have been possible to spend 6+ years building a platform without it. This latest funding allows us to accelerate hiring of world-class talent across engineering, product, design, business operations, and more.

If that sounds exciting to you, send me a note.

[Stedi @stedi]

Announcing our $70M Series B co-led by @stripe and Addition, and with participation from @USV, @firstround, @BloombergBeta, @BoxGroup, @RibbitCapital, and other top investors.

We also recently shipped two AI-native tools: Stedi Agent and MCP server.

For more, check below. ⬇️

[Zack Kanter @zackkanter]

Wildly excited about this launch. Agentic workflows are rapidly eating healthcare RCM; 1/3rd of our customers are AI-native. Our own agent saves customers countless hours – it's also a forcing function for making every critical piece of functionality accessible programmatically.

[Ramp @tryramp]

Full report: https://t.co/AbXuv75gPc

[Stedi @stedi]

Our latest blog captures the cornerstones of Stedi’s engineering culture.

We’re hiring for multiple engineering, product, and design roles - if this post resonates with you, we would love to hear from you!

[Zack Kanter @zackkanter]

Change Healthcare – the nation's largest clearinghouse for insurance claims and payments – has been down for 13 days and counting due to a cyberattack. It's an absolute crisis – doctors, hospitals, and other providers can't get paid. What is a clearinghouse? What is going on? 🧵

[Zack Kanter @zackkanter]

Change Healthcare – the country's biggest clearinghouse for claims processing – has been down for 10 days. @Stedi is preparing to launch drop-in replacements for Change's Claims and Eligibility APIs. If your company needs urgent support, we can help (contact info in thread). 🧵

[Zack Kanter @zackkanter]

The EDI industry revolves around fees – trading partner fees, transaction fees, even 'kilocharacter' fees (really). Customers assume they're being taken advantage of, but the reality is that these fees reflect the cost structure of a typical EDI provider’s business. (1/n)

[Zack Kanter @zackkanter]

We're immensely impressed with the native EDI functionality that @Chain_io has built into their platform using @Stedi's backbone – both in terms of the finished product and the speed at which they built it. Thrilled to partner with a great team.

[Stedi @stedi]

Introducing Stedi Core: An event-driven EDI system that allows you to configure EDI integrations in minutes without being an EDI or development expert.

Exchange EDI with visibility into every transaction. Extend Stedi Core to meet any requirement.

https://t.co/ngj0EaUe9R

[Stedi @stedi]

Electronic Data Interchange is confusing—we're here to help!

Introducing the Stedi EDI Forum: Discuss your burning EDI questions (and complaints) with Stedi experts and the community. Join and post for free: https://t.co/wxVgnni1nF

[Stedi @stedi]

Stedi Guides just got even better. Each interactive EDI specification now supports sample files. Your trading partners can view and edit samples directly in their browsers to learn requirements and debug errors fast.

[Stedi @stedi]

Introducing Public Guides:

Next-generation EDI implementation guides for real-time partner onboarding.

Let's see how it works...
https://t.co/BhSE2vNcLU

[Stedi @stedi]

Introducing EDI Translate: translate between EDI and JSON with modern, machine readable EDI specifications. https://t.co/yZSIBAkGtn

[Stedi @stedi]

Introducing Stedi Guides: Shareable EDI implementation guides for modern EDI integrations. https://t.co/FCyvVrPD56

[Dave Di Biase @davedbase]

@stedi is freaken awesome! Within an hour I was able to convert the incomprehensible #edi format into perfectly mapped out JSON. They just launched Functions and hosted SFTP. I’m in love ❤️