Siteline Construction Billing & Payment API
Siteline construction billing and payment management REST API for subcontractor AIA pay application generation, lien waiver management, and payment tracking. Enables AI agents to manage G702/G703 AIA pay application generation for automated subcontractor billing workflow, handle lien waiver collection and tracking for payment compliance automation, access payment status tracking and cash flow forecasting for subcontractor finance automation, retrieve contract and change order balance tracking for billing accuracy verification, manage conditional and unconditional lien waiver routing for payment gate automation, handle billing period management and schedule of values for construction payment cycle automation, access compliance document tracking (certified payroll, insurance) gated to payment for compliance-first payment workflow, retrieve payment analytics and DSO (days sales outstanding) tracking for cash flow intelligence, manage general contractor billing integration for owner billing alignment, and integrate Siteline with accounting systems (QuickBooks, Sage, Foundation) and project management platforms (Procore, Autodesk).
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Construction billing. SOC2. OAuth2/API key. US. Contract, lien waiver, and payment data.
⚡ Reliability
Best When
A specialty subcontractor or mechanical/electrical/plumbing contractor wanting AI agents to automate AIA G702/G703 pay application generation, lien waiver collection, payment tracking, and construction billing compliance workflow.
Avoid When
LIEN WAIVER LEGAL REVIEW FOR HIGH-VALUE WAIVERS: Automated unconditional lien waiver execution via Siteline for high-value payment amounts must include attorney review; automated unconditional waiver of lien rights without payment receipt confirmation creates permanent lien rights forfeiture and legal exposure. AIA G702/G703 SCHEDULE OF VALUES ACCURACY: Automated percent-complete calculation for schedule of values line items must reflect actual field progress; automated overbilling via inflated completion percentages creates owner-contractor dispute, retainage issues, and potential fraud exposure. CERTIFIED PAYROLL COMPLIANCE GATING: Automated payment release gated to certified payroll submission must verify certified payroll completeness and accuracy; automated payment of prevailing wage projects without certified payroll verification creates Davis-Bacon and state prevailing wage violation. Startup product roadmap stability — Siteline is a venture-backed startup in a competitive construction fintech market; verify current API stability and product roadmap before deep integration dependency.
Use Cases
- • Generating pay applications from subcontractor billing agents
- • Collecting lien waivers from payment compliance agents
- • Tracking payment status from cash flow agents
- • Forecasting cash flow from construction finance agents
Not For
- • General contractor owner billing (focus is subcontractor-side billing)
- • Full construction ERP with job costing and payroll
- • Real estate development project finance
Interface
Authentication
Siteline uses OAuth 2.0 and API key authentication. REST API with JSON. San Francisco, California HQ. Founded 2019. Private (venture-backed, early-stage). Construction billing and payment management for specialty subcontractors. AIA G702/G703 pay application generation, lien waiver management. Competes with Textura (Oracle), Levelset (Procore), and GCPay for construction payment management.
Pricing
San Francisco CA. Private VC-backed startup, founded 2019. Specialty subcontractor billing focus. Per-project or per-seat subscription.
Agent Metadata
Known Gotchas
- ⚠ UNCONDITIONAL LIEN WAIVER LEGAL REVIEW BEFORE EXECUTION: Automated unconditional lien waiver generation and execution for payment amounts above contract threshold must require attorney or project manager review; automated unconditional waiver before confirmed payment receipt permanently forfeits mechanic's lien rights and creates legal exposure
- ⚠ SCHEDULE OF VALUES OVERBILLING RISK: Automated schedule of values percent-complete updates for G702 pay applications must be validated against actual field progress by project manager; automated billing at inflated completion percentages creates owner dispute, potential draw fraud, and construction loan compliance issues
- ⚠ Startup product risk and API stability — Siteline is a venture-backed startup in a competitive market; API breaking changes may occur at faster cadence than enterprise vendors; implement API version pinning and monitor changelog for automated workflow stability
- ⚠ Accounting system sync timing — Siteline integrates with QuickBooks, Sage, and Foundation via sync; automated billing data in accounting system reflects Siteline sync cycle, not real-time; downstream accounts receivable automation must account for sync delay before reporting
- ⚠ Conditional vs unconditional lien waiver state law variance — lien waiver form requirements vary by state (California, Texas, New York have specific statutory forms); automated lien waiver generation must use state-specific form; automated use of generic AIA-style waiver in states with statutory form requirements creates unenforceable waiver
- ⚠ Payment status webhook reliability — Siteline payment status webhooks reflect general contractor payment confirmation, not bank clearing; automated cash application on webhook-notified payment must allow for bank clearance delay before applying to AR
Alternatives
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Scores are editorial opinions as of 2026-03-07.