Software customized to your business and Billy.

Describe the app you need. Our AI engineers build it around 100% of your workflow, connect it to Billy and keep it running. Typically ready to test in 1–2 weeks.

Book a demo

No developers needed. Free test version before you commit.

Invoice approvalsSynced with Billy

Waiting for approval

Vendor	Amount	Status
Apex Office Supply	$1,240.00	Manager
Brightline IT	$6,410.50	Finance review
Metro Facilities	$4,980.00	Approved
Summit Freight	$1,275.00	Posted
Northwind Print	$830.25	No PO

Yes, you can get custom software that connects with Billy.

Yes. Mercovano builds custom business software that connects directly to Billy through Billy (Ageras)'s REST API. Our AI engineers design it around how your team works, and it reads and writes Billy data such as vendors, bills, invoices.

BillyBilly (Ageras) · Accounting

Reads and writes

VendorsBillsInvoicesCustomersChart of accountsPayments

Your appsApprovals · rules · forms

Apps you can build on Billy.

Each one is its own app, built around your rules and connected to Billy, so nothing is typed twice.

Customer	Overdue	Status
Harbor Group	$18,400	Promise Fri
Lakeview Partners	$6,200	Reminder 2
Crest Media	$3,950	60+ days
Pine & Co.	$1,120	Paid

How it connects to Billy.

Vendor: Billy (Ageras)
Category: Accounting
Connection: Direct API, no middleman
API type: REST
Access: Your Billy admin turns on API access, and we give them the exact steps.
Real-time updates: Confirmed during setup.
Writing back to Billy: Confirmed during setup.
File import fallback: Confirmed during setup.

From a description to a working app.

01
Describe the app you need
In your own words: how the work runs today, who approves what, and which systems it touches. Click through a first version and change anything.
02
We build it and connect your systems
Our AI engineers build it on your data. Your admin grants access to your systems, with exact steps from us; we do the rest.
03
Test, launch and improve
Test it free on your own data before you commit; typical apps are ready to test in 1–2 weeks. When your process changes, the app changes with it.

No developers on your side. Just someone who knows how the work gets done.

See how it works in detail →

100% your workflow

Your steps, approvals and policies, not Billy's defaults.

Connected to Billy

Approved work lands in Billy without anyone re-typing it.

One platform, many apps

Every app shares the same Billy connection, sign-in and roles. Add the next one when you need it.

Billy and Mercovano, answered.

Can I get custom software that connects with Billy?

What apps can I build on Billy?

Teams build invoice approvals, receipts and card spend, purchase requests, collections, month-end close and vendor onboarding on Billy, each with their own approval rules, forms and policies. If you can describe the process, we can build it.

How does the software connect to Billy?

Your Billy admin turns on API access, and we give them the exact steps. The connection uses Billy's REST API.

Do I need a developer or IT team?

No. Our AI engineers build, connect, host and maintain your apps. You describe how the work runs today and test it on your own data.

How long does it take?

Typical projects are built and ready to test within 1–2 weeks of going ahead.

How is it priced?

You pay for the software you need, nothing more: no per-user pricing and no implementation fees.