Unified Expense Management API
Knit makes it simpler and faster to add multiple HR, ATS and Expense Management integrations to your app with a single API
What is a Unified Expense Management API?
Expense Management platforms each store data differently, with their own authentication and schemas. A Unified Expense Management API standardizes these into one interface, while Knit manages translation, rate limiting, retries, and sync management underneath.
Build with Knit's Unified Expense Management API
HRIS and Payroll Integrations for Expense Automation
Provision expense accounts and push reimbursements into payroll and ERP systems.
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Integrations for Expense Management
Create bills, expense entries, and journal entries automatically across ERP and accounting systems to streamline expense management.
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Explore this use case4 Expense Management apps you can integrate with today
Brex
Brex integrates via Knit's Unified Expense Management API — one schema, one integration.
Expensify
Expensify integrates via Knit's Unified Expense Management API — live in days, not weeks.
Lucca Expense
Offer Lucca Expense API integration via Knit's Unified Expense Management API — live in days, not weeks.
Rydoo
Rydoo integrates via Knit's Unified Expense Management API — live in days, not weeks.
Don't see your app here?
Describe it to our AI Integrations Agent and get a working integration instantly — no waiting on our roadmap.
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Why Knit for Expense Management integrations
Extensive webhook support
Real-time sync without constant polling — get notified the moment Expense Management data changes.
Scalable infra
Sync thousands of Expense Management records in minutes, not hours.
Add a missing app in days
AI-powered connector building means a missing Expense Management platform isn't a months-long wait.
Unified Expense Management API vs. building it yourself
Building it yourself
- A separate integration for every Expense Management platform you support
- Different schema, auth, and pagination per platform
- You build and maintain OAuth for each platform
- Poll each API on your own schedule
- Engineering effort grows with every new platform
- Weeks to months per platform, per engineer
With Knit
- One Unified Expense Management API covers every platform you support
- One normalized schema across every platform
- Embedded Auth handles OAuth, storage, and refresh for you
- Extensive webhook support for real-time sync
- Describe a missing app to the Integrations Agent and get it built instantly
- Live in days, not months
Customer Stories
See how leading technology firms are scaling their operations
Amazing Product With Exceptional Support from the team. By using Knit we managed to speed up our development by orders of magnitude.
A brilliant tool to let you seamlessly integrate with many different systems. It is very easy to integrate with and customer support is next level.
Seamless integration experience. Well-documented, self-explanatory APIs, and excellent service and support.
Easy to integrate. Knit's dashboard is intuitive for setting up and testing integrations, and the sandbox is extremely useful during development.
Knit shipped a brand-new Timesheet API in a week and handed us a ready-to-use NetSuite sandbox. That velocity is priceless when you're running payroll in 40+ countries.
#1 in Ease of Integrations
4.9 out of 5 stars on G2
Common questions about the Unified Expense Management API
Which Expense Management systems does Knit support?
4 Expense Management platforms today — including Brex, Expensify, Lucca Expense and more. Missing one you need? Knit's AI-assisted connector-build process typically adds a new one within days.
Does the Unified Expense Management API support both reading and writing data?
Yes. It supports both reads and writes, so you can build bi-directional sync use cases — not just pull Expense Management data, but push updates back to the source app.
How does authentication work across Expense Management platforms?
Knit provides an embedded Auth component (white-labeling available on higher tiers) that handles OAuth, credential storage, and refresh — your customers authorize once through Knit, and you never touch raw credentials.
What is the timeline for adding a missing Expense Management connector?
Typically days, not months — the same AI-based connector-build tooling that lets us maintain the 4 Expense Management connectors already live.
Do you store Expense Management data or customer PII?
No. Knit acts as a stateless passthrough — data is processed on our application server and sent directly to your webhooks, without being stored on Knit's servers.
What is the pricing model, and is there a free trial?
You choose the model that fits your business — pricing based on integrated accounts, or based on API call volume. Every plan includes a 30-day free trial before billing starts.