Rex
AI operations partner for order-to-cash, providing an AI workforce of agents that cover every account and resolve exceptions before cash gets stuck.
Where Rex ranks
Current edition · updated Oct 20, 2026About Rex
Rex is an AI-native service for order to cash. We replace people-heavy 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.
Products
AI order-to-cash platform that maps order-to-cash operations as they actually run, then works the process with supervised agents.
AR inbox triage product that auto-triages incoming AR emails and manages customer communication workflows.
Product for customer portal operations, handling uploads to 40+ supplier portals including Ariba, Coupa, and other vendor portals.
Product listed in the footer of Rex's website, part of the Rex AI order-to-cash platform.
What customers say
“Working from one system… it's running over NetSuite, Salesforce, and the AR inbox, and it's just one system.”
“In AR, our two biggest pain points were the inbox and the supplier portals. I was told those two could not be automated.”
“Rex has gotten smarter over time, and looking back from April and May to now, the improvement has been significant. It's figured out that this is how we communicate with our customers.”
Synthesia uses Rex to manage AR workflows across its inbox, NetSuite, Salesforce, and supplier portals. Rex reports completing 22,000 actions autonomously in the first four months while Synthesia's team absorbed doubled…
Case study
Security and compliance
As reported by Rex. Ask for audit reports before you buy.
- SOC 2 Type IIIn progress
- AES-256 encryption at rest
- TLS 1.2+ in transit
- Role-based access control
- Multi-factor authentication
- Audit logging
- Tenant isolation
- Continuous vulnerability scanning
- Penetration testing annually
- SCIM directory sync
- Enterprise SSO
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