Joist API
Joist is a mobile-first business management app built for contractors, used by over 1.3 million tradespeople across plumbing, electrical, roofing, HVAC, general contracting, landscaping, painting, and other trades. This page is an independent design exercise that asks what a well-designed Joist API could look like: the resources it would expose, the authentication it would need, and the workflows it could unlock. Below: a hypothetical endpoint design, the technical requirements a production implementation would face, the use cases programmatic access could serve, and where to start if your team needs this kind of access today.
This page is an independent analysis by Supergood of what a well-designed Joist API could look like. It draws on publicly available information, vendor materials, and general integration experience in this category. Nothing on this page describes an existing Joist product, and Supergood is not affiliated with or endorsed by the vendor. If the vendor offers an official API, we highly recommend it.
What is Joist?
Joist is a mobile-first business management app built for contractors, used by over 1.3 million tradespeople across plumbing, electrical, roofing, HVAC, general contracting, landscaping, painting, and other trades. Contractors use Joist to estimate, invoice, collect payments, offer homeowner financing, and manage clients and projects from anywhere, and to sync jobs and clients into QuickBooks Online for automated bookkeeping.
Core product areas include:
- Estimates (deposits, markups, contracts, sections, and photos)
- Invoicing (payment tracking, reminders, and branded invoices)
- Payments (credit and debit card and online payment acceptance)
- Homeowner Financing (partner lending with funding in ~3 business days)
- Work Orders, Change Orders, and Expense Tracking
- Client Management, Sales Reporting, and Joist Reviews
- QuickBooks Sync (automated bookkeeping with QuickBooks Online)
An API for a platform like this would naturally organize around its core data entities:
- Estimates, Line Items, Markups, Deposits, Sections
- Invoices, Payments, Financing Applications, Refunds
- Clients, Contacts, Properties, Addresses
- Projects, Work Orders, Change Orders, Expenses
- Documents, Photos, Contracts, Attachments
The Joist Integration Challenge
Contractors run their estimating, invoicing, and payment workflows on Joist every day, but turning that mobile-first product into API-driven automation is non-trivial:
- No public developer API: Joist exposes no documented REST API or developer portal, so estimate, invoice, and payment data lives behind the app
- Mobile-first data: Core workflows are built around iOS and Android apps, so data is captured on-device rather than through a web API
- Limited native sync: The built-in QuickBooks Online sync covers jobs and clients but not full job-costing detail, leaving gaps for downstream systems
- Payment and financing flows: Card payments and partner homeowner financing run through embedded providers that aren't directly addressable
- Plan-tiered features: Change orders, sales reporting, and expense tracking are gated by Basic, Pro, and Elite tiers, so available data varies by account
- Document and photo workflows: Contracts, attachments, and job photos need careful upload/download handling to move out of the app
What a Joist API Could Look Like
If Joist exposed a modern, general-purpose API, the integration challenges above suggest what it would need to get right. This is a design sketch, not documentation of anything that exists today:
- First-class authentication: session handling with support for MFA and enterprise sign-on where the platform uses them
- Consistent resources: normalized JSON schemas and pagination across the platform's core objects
- Reliable writes: idempotency keys and validation that mirrors the platform's own workflow rules
- Entitlement awareness: endpoints scoped to what each customer's licensing actually permits
The endpoint sketches, technical requirements, and use cases below flesh out this hypothetical design.
How AI agents could connect to software like Joist: MCP servers for software without a public API →
Need This Kind of Access Today?
If your team needs this kind of access today, Supergood builds integrations on request, one customer at a time. We act at the direction of our customers, within the access they already hold. Customers bring their own accounts, licenses, and entitlements. If the vendor offers an official API, we highly recommend it.
- Schedule an Integration Assessment
A 30-minute session to review your product mix, licensing, and authentication model. - Scope the Integration
We design the access pattern around your workflows and entitlements. - Deploy with Monitoring
Go live with continuous monitoring as your platforms evolve.
Potential API Endpoints
Authentication
/authenticateWould authenticate to a Joist account using username/password, or MFA, and obtain a session token for downstream calls.
Estimates
/estimatesWould list estimates with filters for client, status, date range, and amount, including line items, markups, and deposits.
Estimates
/create_estimateWould create a new estimate with line items, sections, markups, and deposit terms for a client.
Invoices
/invoicesWould retrieve invoices and payment status across paid, partial, and outstanding states with reminder history.
Invoices
/create_invoiceWould generate a new invoice from an estimate or from scratch, with line items and payment terms.
Payments
/paymentsWould pull payment and homeowner financing records with method, amount, status, and associated invoice.
Clients
/clientsWould list clients and contacts with properties, addresses, and associated projects and jobs.
Use Cases
Sync estimates and invoices into your accounting stack
- Pull estimates, invoices, and line items from Joist into a single warehouse - Stream payment and financing events to downstream AR and bookkeeping tools - Reconcile job and client records beyond the native QuickBooks Online sync
Automate estimate and invoice creation
- Push new estimates with sections, markups, and deposits without app clicks - Generate invoices from approved estimates and trigger payment reminders - Apply change orders to existing projects programmatically
Centralize client and project data
- Sync clients, contacts, and properties into a CRM or customer 360 - Keep projects, work orders, and expenses aligned across systems - Surface new leads and won jobs to sales and reporting tools
Track payments and homeowner financing
- Pull card payments and financing applications for cash-flow reporting - Match payments to invoices and flag outstanding balances for collections - Feed funding status into downstream finance and notification workflows
Technical Requirements
Authentication
Would require username/password and MFA (SMS, email, TOTP) with managed session handling
Connectivity
Would build on authenticated app and web flows; no public Joist developer API is required or assumed
Response format
Normalized JSON across Estimates, Invoices, Payments, Clients, and Projects objects
Rate limits
Adaptive throttling tuned to your account to avoid Joist-side limits
Session management
Would need automatic session refresh, MFA replay handling, and credential rotation
Data freshness
Near real-time pulls for estimates, invoices, and payments with optional scheduled batch syncs
Security
Encrypted credential vault, scoped access tokens, SOC 2-aligned controls, and audit logging
Webhooks
Event-style callbacks for estimate approval, invoice issuance, payment received, and financing status
Latency
Design target: sub-second reads on cached entities; multi-second writes when posting estimates and invoices
Throughput
Design target: horizontally scaled workers sized to high-volume estimating and invoicing activity
Reliability
Retry, backoff, and idempotency keys for invoice creation and payment transactions
Versioning
Clear versioning and change management would matter as Joist evolves
Frequently asked questions
Availability of official interfaces varies by product, plan, and licensing. Many platforms in this category gate access behind partner programs or paid modules, and there is often no broadly available, self-serve public API. Check the vendor's developer resources for current offerings.
The hard parts would be authentication (MFA, session management, enterprise controls), consistent schemas across the platform's products, and write semantics that reconcile the way the platform's own workflows do.
No. This page is an independent analysis by Supergood and is not affiliated with, sponsored by, or endorsed by the vendor. All product names and trademarks belong to their respective owners and are used for identification only. Nothing here documents an actual Joist product or service.
Supergood acts at the direction of its customers, within the access those customers already have. We respect each customer's agreements with their software vendors, and how those agreements apply to a customer's use is a determination the customer makes. If the vendor offers an official API, we highly recommend it.
Supergood builds managed API access to enterprise software for customers on request, scoped to each customer's own licensing and entitlements. If your team needs programmatic access to a platform like this, schedule an integration assessment to discuss options.