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Full detail: Where this data comes from
STACK Construction Technologies makes cloud-based preconstruction software for on-screen takeoff and estimating, used by contractors across most trades (website: stackct.com).
API access model: STACK exposes a real, documented REST API (v2) - but access is gated. You must be a STACK customer on an API-Enabled Subscription (or an approved software partner) to obtain credentials. Authentication is OAuth 2.0, offered as two-legged (client-credentials, server-to-server on an account you control) and three-legged (authorization-code, acting on behalf of a user) flows. Tokens are issued by a per-tenant authorization server; the API base follows the pattern https://{server}/api/v2, where {server} is the host provided with your API credentials. Access tokens are valid for 8 hours, authorization codes for 5 minutes, and refresh tokens for 90 days.
The full endpoint reference sits behind an access request. The API surface documented here is modeled from STACK's public developer overview, authentication guide, and tutorials - it is not sourced from an official machine-readable OpenAPI document. Only calls published in STACK's own Developers Reference are officially supported.
APIs.json: https://raw.githubusercontent.com/api-evangelist/stack-takeoff/refs/heads/main/apis.yml
- Construction
- Preconstruction
- Takeoff
- Estimating
- Construction Technology
- Partner API
- Created: 2026-07-04
- Modified: 2026-07-04
Endpoints below are modeled from STACK's public developer docs and tutorials. Exact paths, request/response shapes, and available operations are confirmed only after you obtain API access from STACK.
Create and update projects and organize their contents in folders - the top-level container that takeoffs, plans, and estimates hang off of.
- Human URL: https://www.stackct.com/developers-docs/
- Base URL:
https://{server}/api/v2
Upload plan sets and supporting documents into project folders, read file metadata, update file properties, and download plans.
- Human URL: https://www.stackct.com/developers-docs/
- Base URL:
https://{server}/api/v2
Create takeoffs on a project, list a takeoff's pages, set page scale, and retrieve measured quantities. On-screen takeoff is STACK's core workflow.
- Human URL: https://www.stackct.com/developers-docs/
- Base URL:
https://{server}/api/v2
Create, update, and retrieve estimate proposals - turning takeoff quantities into priced line items and a bid.
- Human URL: https://www.stackct.com/developers-docs/
- Base URL:
https://{server}/api/v2
Manage items and assemblies attached to takeoffs and retrieve their quantities and costs, so partner tools can pull takeoff/estimating data into invoices, purchase orders, or a separate estimating system.
- Human URL: https://www.stackct.com/developers-docs/
- Base URL:
https://{server}/api/v2
Read-only lookup endpoints for cost types, states, and countries used when constructing projects and estimates.
- Human URL: https://www.stackct.com/developers-docs/
- Base URL:
https://{server}/api/v2
FN: Kin Lane Email: kin@apievangelist.com