STACK

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.

STACK publishes 6 APIs on the APIs.io network. Tagged areas include Construction, Preconstruction, Takeoff, Estimating, and Construction Technology.

STACK’s developer surface includes documentation, authentication, signup flow, engineering blog, and 6 more developer resources.

🌐 Visit website 📡 Source on GitHub

26.8/100 thin ▬ flat Agent 5/100 human only Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0

AccessFreemiumFree trial

6 APIs

Construction Preconstruction Takeoff Estimating Construction Technology Partner API

Kin Score

Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0

Composite quality — 26.8/100 · thin

Contract Quality 0.0 / 25

Developer Ergonomics 4.8 / 20

Access Clarity 10.5 / 20

Operational Transparency 4.1 / 13

Contract Governance 0.0 / 12

Discoverability 7.4 / 10

Agent readiness — 5/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Surface 0 / 5

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/stack-takeoff: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

Rate Limits 1

Documented rate limits and quota policies.

Stack Takeoff Rate Limits

4 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

RateLimits

RateLimits

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 3

The organization behind the API

LinkedIn

Website

Website

Blog

Blog

Source (apis.yml)

aid: stack-takeoff
url: https://raw.githubusercontent.com/api-evangelist/stack-takeoff/refs/heads/main/apis.yml
name: STACK
kind: company
description: 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.
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: true
  try_now: false
  public: false
  label: Freemium (free trial)
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/stack-takeoff.png
tags:
- Construction
- Preconstruction
- Takeoff
- Estimating
- Construction Technology
- Partner API
created: '2026-07-04'
modified: '2026-07-04'
specificationVersion: '0.23'
apis:
- aid: stack-takeoff:stack-takeoff-projects-api
  name: STACK Projects API
  tags:
  - Project
  - Folders
  - Preconstruction
  tags_raw:
  - Projects
  - Folders
  - Preconstruction
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stackct.com/developers-docs/
  baseURL: https://{server}/api/v2
  properties:
  - url: https://www.stackct.com/developers-docs/
    type: Documentation
  - url: https://www.stackct.com/developers-reference/
    type: APIReference
  description: 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 tutorials (POST/PUT /Projects, project Folders CRUD).
- aid: stack-takeoff:stack-takeoff-plans-files-api
  name: STACK Plans & Files API
  tags:
  - Plans
  - File
  - Documents
  tags_raw:
  - Plans
  - Files
  - Documents
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stackct.com/developers-docs/
  baseURL: https://{server}/api/v2
  properties:
  - url: https://www.stackct.com/developers-docs/
    type: Documentation
  - url: https://www.stackct.com/developers-docs-tutorials/
    type: Documentation
  description: 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/Files endpoints).
- aid: stack-takeoff:stack-takeoff-takeoffs-api
  name: STACK Takeoffs API
  tags:
  - Takeoff
  - Pages
  - Quantities
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stackct.com/developers-docs/
  baseURL: https://{server}/api/v2
  properties:
  - url: https://www.stackct.com/developers-docs/
    type: Documentation
  - url: https://www.stackct.com/developers-docs-tutorials/
    type: Documentation
  description: 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 developer tutorials (CreateTakeoff, Takeoffs Pages, Scale).
- aid: stack-takeoff:stack-takeoff-estimates-api
  name: STACK Estimates API
  tags:
  - Estimating
  - Proposals
  - Costs
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stackct.com/developers-docs/
  baseURL: https://{server}/api/v2
  properties:
  - url: https://www.stackct.com/developers-docs/
    type: Documentation
  - url: https://www.stackct.com/developers-docs-tutorials/
    type: Documentation
  description: Create, update, and retrieve estimate proposals - turning takeoff quantities into priced line items and a bid.
    Modeled from STACK's developer tutorials (EstimateProposals endpoints).
- aid: stack-takeoff:stack-takeoff-items-assemblies-api
  name: STACK Items & Assemblies API
  tags:
  - Item
  - Assemblies
  - Cost Data
  tags_raw:
  - Items
  - Assemblies
  - Cost Data
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stackct.com/developers-docs/
  baseURL: https://{server}/api/v2
  properties:
  - url: https://www.stackct.com/developers-docs/
    type: Documentation
  description: 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. Modeled from STACK's
    developer overview description of core capabilities.
- aid: stack-takeoff:stack-takeoff-reference-data-api
  name: STACK Reference Data API
  tags:
  - Reference Data
  - Cost Types
  - Lookups
  image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/apis-json-logo.jpg
  humanURL: https://www.stackct.com/developers-docs/
  baseURL: https://{server}/api/v2
  properties:
  - url: https://www.stackct.com/developers-docs-tutorials/
    type: Documentation
  description: Read-only lookup endpoints for cost types, states, and countries used when constructing projects and estimates.
    Modeled from STACK's developer tutorials (CostTypes, States, Countries).
common:
- type: DomainSecurity
  url: security/stack-takeoff-domain-security.yml
- type: LinkedIn
  url: https://www.linkedin.com/company/stack-construction-technologies
- type: Website
  url: https://www.stackct.com/
- type: Documentation
  url: https://www.stackct.com/developers-docs/
- type: Authentication
  url: https://www.stackct.com/developers-docs-authentication/
- type: SignUp
  url: https://www.stackct.com/developers/
- type: Plans
  url: plans/stack-takeoff-plans-pricing.yml
- type: RateLimits
  url: rate-limits/stack-takeoff-rate-limits.yml
- type: FinOps
  url: finops/stack-takeoff-finops.yml
- url: https://www.stackct.com/blog/
  type: Blog
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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STACK

Kin Score

APIs 6

STACK Projects API

STACK Plans & Files API

STACK Takeoffs API

STACK Estimates API

STACK Items & Assemblies API

STACK Reference Data API

Pricing Plans 1

Stack Takeoff Plans Pricing