Rex
AI-native BPO for enterprise order-to-cash
About Rex
Rex is an AI-native service for order to cash. Rex replace manual operations with AI agents that continuously manage invoices, customers and exceptions. Order to cash is a $60B outsourced function because the work is too messy for traditional automation. Every customer has different context, exceptions do not follow clean rules, and the next step is often buried in emails, portals, handoffs, or someone’s memory. Rex agents run continuously in the background and resolve work to SLA standards so cash keeps moving. We're live with pre-IPO tech companies, managing >$500m in receivables from F100 companies, cutting manual follow-up cycles from weeks to hours. We founded Rex after spending four years building Sequence, an a16z-backed finance ops platform, from zero to Series A — where we saw firsthand that at-scale, O2C still runs on manual labour. Rex is the #1 winner of the Vercel AI Accelerator out of 2,500 teams, selected by Guillermo Rauch and leaders from OpenAI, Anthropic, Browserbase and more.
Public traction evidence
Each signal links to the public source used for attribution.
- LinkedIn
We just moved to San Francisco for Y Combinator (S26) 🌁 Excited to continue building Rex amongst some incredible founders. | Merlin Kafka | 175 comments
| Merlin Kafka | 175 comments URL Source: https://linkedin.com/posts/activity-7475606763560632320-L7Fq Markdown Content: Agree & Join LinkedIn By clicking Continue to join or sign in, you agree to LinkedIn’s [User...
- X
Today we're launching Rex (YC S26) Every enterprise is exploring where AI can transform back-office operations.
Today we're launching Rex (YC S26) Every enterprise is exploring where AI can transform back-office operations. Order-to-cash is one of the clearest places to start: it is high-volume, manual work with a direct impact on cash. Introducing Rex:
- X
We won Vercel's AI Accelerator - and are coming out of stealth @rexdotinc 🚀
We won Vercel's AI Accelerator - and are coming out of stealth @rexdotinc 🚀
- LinkedIn
We're excited to announce Rex to the world - and we just won the Vercel AI Accelerator. | Rex (YC S26)
| Rex (YC S26) URL Source: https://linkedin.com/posts/rex-ai-inc_were-excited-to-announce-rex-to-the-world-activity-7455036796402483200-hmUu Markdown Content: Agree & Join LinkedIn By clicking Continue to join or sign in, you agree to LinkedIn’s [User...
- X
We're coming out of stealth and announcing Rex to the world.
We're coming out of stealth and announcing Rex to the world.
- X
Hello, meet Rex.
Hello, meet Rex.
- X
Just moved to San Francisco for @ycombinator (S26) 🌁
Just moved to San Francisco for @ycombinator (S26) 🌁
- LinkedIn
Rex joins NVIDIA Adopt 100 Launch initiative with Deloitte | Rex (YC S26) posted on the topic | LinkedIn
[Skip to main content](https://linkedin.com/posts/rex-ai-inc_londontechweek-ai-nvidia-activity-7470120145068371968-PB5t#main-content)[LinkedIn](https://linkedin.com/?trk=[redacted-public-param]) * [Top Content](https://www.linkedin.com/top-content?trk=[redacted-public-param]) *...