Synthesia runs AR operations on Rex

AI agents that run your order-to-cash operations

Rex maps your order to cash process, highlights where cash gets stuck, then recovers it with AI agents. Get a review in days, see ROI in weeks.

Find anything…

Evening, Julia

Rex is handling your receivables across 342 customers and 1,909 invoices.

RECEIVABLES WORKED

$18.6M

across 1,855 invoices

● Activity live

Closed reminder after payment received

AI that does the work.

ROI you can measure.

12 days

REDUCTION IN DSO
BASELINE DEPENDENT

15h

SAVED PER AR OPERATOR
PER WEEK

1 min

CUSTOMER RESPONSE TIME
ON AVERAGE

Y Backed by Y Combinator

▲ #1/2500 Vercel AI Accelerator

synthesia

Synthesia runs AR operations with Rex.

The AR inbox, 30+ customer portals, and collections, handled by Rex with no added headcount.

SOLUTION

Rex runs your order-to-cash process continuously.

Agents work every invoice, account, and customer touchpoint so cash keeps moving.

• COVER EVERY ACCOUNT

Review every open PO on Ariba …

↑

Run order to cash at any scale, with the team you already have. Delegate inbox triage, supplier portals, and cash application.

• SEE EVERYTHING

Real-time visibility across your AR book. Stop tracking notes in spreadsheets. Get a live view of every customer and receivable.

• STAY AHEAD

Case · Boeing • ACTIVE CASE

• Detected payment cadence drift +7d
• 3 open invoices. No activity since Mar 28
• Risk score: 82% slip past 60-day terms
• Rex is monitoring

Get ahead of every receivable. Rex proactively follows up, flags risk and resolves issues before they escalate.

FOUNDERS

We spent four years inside this problem,

building order-to-cash software for finance teams.

BILLING ENGINE

Billions in receivables processed

ERP INTEGRATIONS

50+ completed, NetSuite & beyond

RECEIVABLES AUTOMATION

AR run for hundreds of finance teams

REVENUE RECOGNITION

Built ASC 606 software for SaaS

Merlin Kafka

CO-FOUNDER & CEO

Previously CPO at Sequence. Before that, led product at Tessian, building enterprise AI security for banks and law firms.

LinkedIn

Lewis Blackwood

CO-FOUNDER & CTO

Led engineering at Sequence as one of its first hires. Earlier, early engineer at GoCardless and founder of Personably.

LinkedIn

“Four years in this space taught us one thing: everything is an edge case. Because every customer’s AR and AP team operates differently. The real work is the judgment that happens between systems. That is what we built Rex to carry.”

Merlin Kafka

CO-FOUNDER & CEO

BACKED BY

And leaders from

PARTNERS

Deloitte.

aws