Rex is an AI-native operations partner for enterprise order-to-cash, replacing manual operations with AI agents that manage invoices, customers, and exceptions. The company states it is live with pre-IPO tech companies, managing more than $500m in receivables, and has won the Vercel AI Accelerator. Rex is part of Y Combinator's Summer 2026 batch and is based in London.
Rex
ActiveAI Operations Partner for Enterprise Order to Cash
Total raised
$500K
1 round
Stage
Seed
Jan 2026
Team
1-10
since 2026
Pricing
—
Founded
2026
London, United Kingdom
Agent-ready
—
AI-native operations partner for enterprise order-to-cash
AI agents that manage invoices
Customer account management across the order-to-cash cycle
Automated handling of exceptions
Replaces manual order-to-cash operations with agents
Reports managing over $500m in receivables
Live with pre-IPO technology companies
12/100
Early
MCP server
Public API
Webhooks
OAuth 2.0
SDKs
No public agent surfaces detected yet.
Jan 2026 Seed $500K ● Y Combinator
Capital network
$500K raised ·1 backer·10 network links
- Backers1
- Shared portfoliocompanies these backers also fund
- Extended networkfunds that co-invest alongside them
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- What is Rex?
- Rex is an AI-native operations partner for enterprise order-to-cash, replacing manual operations with AI agents that manage invoices, customers, and exceptions.
- Who uses Rex?
- Rex says it is live with pre-IPO tech companies and reports managing more than $500m in receivables. These figures are company-reported.
- Has it received recognition?
- Rex won the Vercel AI Accelerator and is part of Y Combinator's Summer 2026 batch.
- Where is Rex based?
- Rex is based in London.
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