# STACK

**Canonical:** https://apis.io/providers/stack-takeoff/  
**Website:** https://www.stackct.com/  
**APIs profiled:** 6

STACK Construction Technologies makes cloud-based preconstruction software for on-screen takeoff and estimating used by contractors across most trades. STACK does expose a real, documented REST API (v2), but access is gated - you must be a STACK customer on an API-Enabled Subscription (or an approved partner) to obtain credentials. Authentication is OAuth 2.0, offered as two-legged (client-credentials, server-to-server) and three-legged (authorization-code, on behalf of a user) flows. Tokens are issued by a per-tenant authorization server (base pattern https://{server}/api/v2). The full endpoint reference sits behind an access request; the API surface catalogued here is modeled from STACK's public developer overview, authentication guide, and tutorials - it is not sourced from an official machine-readable OpenAPI document.

## Kin Score — 26.8 / 100 (thin)

Scored 2026-08-25 under rubric 0.14.0. Trend: flat (+0.0 from 26.8).

| Facet | Score |
|---|---|
| Discoverability | 74.1 |
| Contract Quality | 0.0 |
| Governance | 0.0 |
| Contract Governance | 0.0 |
| Operational Transparency | 31.6 |
| Developer Ergonomics | 23.8 |
| Commercial Clarity | 52.6 |
| Access Clarity | 52.6 |

## Agent readiness — 5.0 (human-only)

| Dimension | Value |
|---|---|
| Spec Presence | no |
| Agentic Access | no |
| Reversibility Documented | no |
| MCP Server | no |
| Auth Clarity | bearer |
| Idempotency | no |
| Error Semantics | no |
| OpenAPI Examples | no |
| Rate Limit Signal | documented |
| Event Surface Described | no |
| Agent Skills | no |
| Well Known Catalog | no |
| Consent Identity | no |
| Agent Card | no |
| Dry Run Mode | no |
| Delegated Identity | no |
| Protected Resource Metadata | no |
| Dynamic Client Registration | no |
| Agentic Commerce | no |

## Access

Freemium (free trial) — onboarding: unknown, pricing: freemium, trial: yes (confidence: medium).

## APIs (6)

- **STACK Projects API** — Create and update projects and organize their contents in folders - the top-level container that takeoffs, plans, and estimates hang off of. Modeled from STACK's developer tutor...
- **STACK Plans & Files API** — Upload plan sets and supporting documents into project folders, read file metadata, update file properties, and download plans. Modeled from STACK's developer tutorials (Folders...
- **STACK Takeoffs API** — 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. Modeled from STACK's develope...
- **STACK Estimates API** — Create, update, and retrieve estimate proposals - turning takeoff quantities into priced line items and a bid. Modeled from STACK's developer tutorials (EstimateProposals endpoi...
- **STACK Items & Assemblies API** — 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 ...
- **STACK Reference Data API** — Read-only lookup endpoints for cost types, states, and countries used when constructing projects and estimates. Modeled from STACK's developer tutorials (CostTypes, States, Coun...

## Security (1)

- **Stack Takeoff Domain Security** — TLSv1.3 · HSTS · DMARC

## Plans (1)

- **Stack Takeoff Plans Pricing**

## Tags

Construction, Preconstruction, Takeoff, Estimating, Construction Technology, Partner API

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/providers/stack-takeoff/). Scores are computed from the provider's own public artifacts under a published rubric.