The Repeatable Capital Play: How Joist and Invoice Simple Embedded Lending Across a Platform

At a Glance

Joist and Invoice Simple are vertical SaaS platforms built for service-based small businesses, contractors, tradespeople, and independent operators who manage estimates, invoices, and payments through software designed for how they work. Both platforms are part of EverPro, a family of trade-specific business software brands serving more than 350,000 home and field service pros. For these SMBs, cash flow is a constant challenge: expenses hit upfront, but revenue arrives after the job is done. Across both platforms, one need consistently rose to the top of customer feedback: faster, simpler access to working capital at the moments it matters most.

Rather than build a lending product inside each platform from scratch, Joist and Invoice Simple sought a single embedded capital partner that could power capital experiences across multiple platforms, quickly, compliantly, and at scale. By partnering with Fundbox, they were able to do exactly that, laying the groundwork for a model that would eventually extend across the broader EverPro family of brands.

The partnership launched first inside Joist, with a fully embedded lending experience built on Fundbox’s APIs. After early success, the same Fundbox-powered integration was extended to Invoice Simple, expanding capital access to a significantly larger base of SMBs, and establishing a repeatable model for what embedded lending can look like across a family of platforms.

The Opportunity: A Repeatable Capital Layer Across Platforms

Joist and Invoice Simple serve distinct but overlapping SMB segments, and their customers share a common operational reality: cash arrives after the work is done, but expenses start upfront. Materials, labor, and scheduling must be covered well before invoices are paid, and traditional lending options force operators out of the tools they use to run their business.

Across both brands, SMBs were facing the same friction:

• No access to capital through current platform
• Lengthy applications that pulled them out of their workflow
• Weeks of waiting for an approval decision
• A disconnect between their financing and their day-to-day operations

The platforms recognized two things at once. First, customer demand for capital was clear and consistent. Second, building a compliant lending program inside each platform would require deep credit, compliance, and engineering investment, and would compete with other core product priorities on the roadmap.

The strategic answer was a shared capital layer. Rather than duplicate that infrastructure twice, Joist and Invoice Simple sought a single partner who could own the financial infrastructure end-to-end and deploy a consistent lending experience across multiple SaaS platforms, starting with Joist and scaling from there.

Why an Embedded Capital Partner and Why Fundbox

Joist chose Fundbox for the flexibility of its embedded lending stack: a fully managed, end-to-end platform that integrates quickly and adapts to how each platform brings capital to its customers.

Fundbox enables Joist and Invoice Simple to:

• Launch embedded lending quickly, using shared APIs and a repeatable integration pattern that doesn’t require rebuilding the capital stack for each new platform
• Avoid building or maintaining lending infrastructure, underwriting, servicing, or compliance in-house
• Deliver a trusted, compliant lending experience that meets the standards of regulated financial products
• Continuously improve credit access for SMBs as they grow, without reapplications or added friction

Just as importantly, Fundbox was built to scale across a portfolio. The same infrastructure that powers Joist Lending can be extended to additional platforms without rebuilding the underlying capital stack, turning embedded lending into a repeatable, ecosystem-wide capability rather than a one-off product.

A key factor in our decision was that Fundbox does their own underwriting. A lot of their competitors use third parties, and we knew that if the risk model didn’t fit our customers, we’d be dealing with an extra layer of another organization to change it. With Fundbox, they own the model, which means we can work together directly and collaborate to get it right.

— John Lee, Strategic Partnerships

The Solution: Capital Infrastructure, Built to Scale

Starting with Joist

Fundbox and Joist co-built Joist Lending: an embedded lending experience delivered directly inside the Joist platform on both web and mobile. Through Fundbox’s pre-qualification APIs, Joist securely passes SMB data into Fundbox’s underwriting engine, enabling:

• Curated, pre-qualified offers surfaced directly in-platform
• Quick streamlined application flows
• Fast decisions without leaving Joist

From initial build to official launch, it took just three weeks.

Continuously Improving, Not Just Launched

After go-live, Fundbox and Joist treated Joist Lending as a continuously evolving product and still do so today. Fundbox regularly reviews performance data and adjusts underwriting models, eligibility criteria, and offer structures. As SMBs grow and demonstrate stronger performance, Fundbox regularly reviews prequalified offer eligibility and may update available credit options without requiring reapplications or additional friction.

The result is a living capital layer that improves alongside the platform and its customers, rather than a static feature.

Expanding to Invoice Simple

With Joist Lending proving the model, the same integration pattern was extended to Invoice Simple, a widely used invoicing platform for service-based SMBs. Because the underlying Fundbox infrastructure was already in place, Invoice Simple Lending launched on the shared capital stack, bringing the same embedded, pre-qualified experience to a substantially larger SMB base.

By June 2025, Joist Lending had expanded access to over 150,000 SMBs. By August 2025, Invoice Simple was live on the same Fundbox-powered integration, the second platform in the family to deploy embedded capital through Fundbox.

Looking Ahead: Capital Across a Growing Platform Ecosystem

What started with Joist has become something larger: a shared capital foundation, deployed brand-by-brand, that meets each platform’s SMBs where they already work.

With Joist and Invoice Simple live, the same Fundbox-powered integration has since expanded to Service Fusion, ImproveIt 360, MarketSharp, and the momentum isn’t slowing. Six additional platforms are actively in progress:

• PaySimple Direct — payments and business management for service businesses
• Fieldpoint — Enterprise platform for commercial and industrial service organizations
• DynaScape — Professional landscape design, estimating, and business management
• RoofSnap — roofing estimation and project management
• Briostack — End-to-end platform for lawn care and pest businesses

Each new launch follows the same pattern: Fundbox’s capital infrastructure drops into the platform, pre-qualified offers surface natively, and SMBs get access to working capital without leaving the tools they already rely on. No new underwriting stack to build. No compliance program to manage in-house. No friction added to the customer experience.

What’s exciting isn’t just that the model works, it’s how fast we can move now. We turn on capital for one platform, and then the next, and the next. Joist, Invoice Simple, Service Fusion, we’re not slowing down. Every platform that goes live means thousands more SMBs get access to capital inside the tools they already use every day. That’s what we’re building toward.

— Rob Carbonell, VP of Partnerships at Fundbox

The opportunity is expanding geographically, too. Fundbox is actively working with its platform partners to extend embedded lending into the UK, Australia, and Canada, bringing the integrated capital experience to SMBs in new markets, under local regulatory frameworks, without requiring partners to build market-specific lending infrastructure.

The result is a capital layer that compounds. Every brand that goes live reinforces the infrastructure, expands the SMB base with access to capital, and validates the model for the next one. What began as a single integration is becoming an embedded capital foundation across an entire ecosystem of vertical SaaS platforms, and it’s still growing.

Interested in bringing embedded capital to your platform? Learn how Fundbox partners with vertical SaaS companies.