Formstack

Formstack is a no-code workplace productivity platform spanning online forms, document generation, electronic signature, and workflow automation. The developer portal at developers.formstack.com exposes a REST API (v2025.0) for forms, submissions, fields, webhooks, folders, and partial submissions, plus product-specific surfaces for Formstack Documents, Formstack Sign, and Formstack Workflows. Authentication uses OAuth 2.0. Machine-readable indexes and OpenAPI artifacts are surfaced at developers.formstack.com/llms.txt.

Formstack publishes 10 API contracts indexed on the APIs.io network, including Webhooks API, Partner API, and 8 more. Tagged areas include Forms, Documents, E-Signature, Workflow Automation, and No-Code.

The Formstack catalog on APIs.io includes 1 Spectral governance ruleset.

Formstack’s developer surface includes authentication, documentation, changelog, GitHub presence, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

24.4/100 emerging ▬ flat Agent 34/100 agent ready Front door AI 3/6 light Heartbeat 52/100 alive Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract

Forms Documents E-Signature Workflow Automation No-Code OAuth Authentication

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 24.4/100 · emerging

Contract Quality 1.8 / 19

Developer Ergonomics 3.6 / 15

Access Clarity 2.0 / 15

Operational Transparency 2.8 / 10

Contract Governance 1.2 / 9

Discoverability 5.5 / 8

Regulatory Posture 4.9 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 34/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 6 / 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 Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented)
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too

6 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 9.5 — up to +22.6 composite points
Access Clarity scores 13.2 — up to +17.4 composite points
Developer Ergonomics scores 23.8 — up to +15.2 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/formstack/apis.yml: open an issue on github.com/api-evangelist/formstack to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Surveys, Market Research and Experience Management	builds-on	32.8	-	-
TX-RAMP Certified Cloud Products (Texas DIR)	builds-on	32.8	-	-
Smartsheet Marketplace (connectors and partner-built solutions on Smartsheet)	builds-on	32.8	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 4

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OAuth

tagged — the provider's own APIs.json carries the standard as a tag; implementation not verified

OpenAPI

measured — observed by APIs.io (published)

AsyncAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 10

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

Formstack Forms API

REST API for creating, reading, updating, and deleting forms in a Formstack account, including form configuration, styling, and access rules.

Formstack Submissions API

Read, create, update, and delete form submissions; supports filtering by date, search, and field values. Returns submitted field data and metadata.

Formstack Fields API

Programmatically manage form fields - text, select, file upload, signature, payment, calculation, and others - including ordering, validation, and conditional logic.

Formstack Webhooks API

Configure webhook subscriptions to receive submission events at a customer-provided URL, with retry semantics for failed deliveries.

Formstack Folders API

Manage folder organization for forms within a Formstack account.

Formstack Documents API

Programmatic interface to Formstack Documents (formerly WebMerge) for generating PDFs, Word docs, and other templated documents from data payloads.

Formstack Sign API

Electronic signature API for sending documents for signature, tracking status, and retrieving signed copies. Part of the Formstack Suite.

Formstack Workflows API

Workflow automation surface for routing submissions, documents, and approvals across multi-step business processes.

Formstack OAuth 2.0

OAuth 2.0 authorization server used to authenticate API clients and issue access tokens for the Formstack REST API.

Formstack Partner API

PartnerApi

Scroll for all 10

Open Collections 10

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Formstack Webhooks

OPEN COLLECTION

Formstack Confirmations API

OPEN COLLECTION

Formstack Confirmations Fields API

OPEN COLLECTION

Formstack Confirmations Folders API

OPEN COLLECTION

Formstack Confirmations Forms API

OPEN COLLECTION

Formstack Confirmations Notifications API

OPEN COLLECTION

Formstack Confirmations Subaccounts API

OPEN COLLECTION

Formstack Confirmations Submissions API

OPEN COLLECTION

Formstack Confirmations Webhooks API

OPEN COLLECTION

Formstack API

OPEN COLLECTION

Scroll for all 10

Formstack API pricing

Not yet checked against Formstack's own pricing page. Compiled by API Evangelist on 2026-05-22; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Pro Tier Default: 120 requests per minute

Compiled by API Evangelist, not yet checked against Formstack's documentation. Rate-limit details →

Pricing Plans 1

Published pricing tiers and plan structures.

Formstack Plans Pricing

1 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Formstack Rate Limits

2 limits

RATE LIMITS

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Formstack

SLA

FinOps 1

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

Formstack Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Formstack API Rules

58 rules · 53 errors 3 warnings 2 info

SPECTRAL

Security Posture 4

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Formstack Authentication

oauth2 · 1 scheme

SECURITY

Formstack Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Formstack Vulnerability Disclosure

no policy recorded

SECURITY

Formstack Trust Center

SOC 2, ISO 27001, ISO 27017, ISO 27018, PCI DSS, HIPAA, FedRAMP, GDPR, CSA STAR

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Formstack Scopes

4 scopes · authorizationCode

4 scopes

SCOPES

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Formstack Agentic Access

39 operations · 23 acting

AGENTIC

Resources

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHub

GitHub

Access & Security 5

Authentication, authorization, and security posture

TrustCenter

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Authentication

Authentication

OAuthScopes

OAuthScopes

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

ChangeLog

ChangeLog

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 4

The organization behind the API

Website

Website

LinkedIn

Twitter

Twitter

Blog

Blog

Source (apis.yml)

aid: formstack
url: https://raw.githubusercontent.com/api-evangelist/formstack/refs/heads/main/apis.yml
name: Formstack
kind: company
description: Formstack is a no-code workplace productivity platform spanning online forms, document generation, electronic
  signature, and workflow automation. The developer portal at developers.formstack.com exposes a REST API (v2025.0) for forms,
  submissions, fields, webhooks, folders, and partial submissions, plus product-specific surfaces for Formstack Documents,
  Formstack Sign, and Formstack Workflows. Authentication uses OAuth 2.0. Machine-readable indexes and OpenAPI artifacts are
  surfaced at developers.formstack.com/llms.txt.
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/formstack.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-03
tags:
- Forms
- Documents
- E-Signature
- Workflow Automation
- No-Code
- OAuth
- Authentication
tags_raw:
- Forms
- Documents
- eSignature
- Workflow Automation
- No-Code
- OAuth2
- Workflow-Automation
- Authentication
created: '2026-05-23'
modified: '2026-05-30'
specificationVersion: '0.23'
apis:
- aid: formstack:forms
  name: Formstack Forms API
  description: REST API for creating, reading, updating, and deleting forms in a Formstack account, including form configuration,
    styling, and access rules.
  humanURL: https://developers.formstack.com/reference/api-overview
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Forms
  - REST
  properties:
  - type: Documentation
    url: https://developers.formstack.com/reference/api-overview
- aid: formstack:submissions
  name: Formstack Submissions API
  description: Read, create, update, and delete form submissions; supports filtering by date, search, and field values. Returns
    submitted field data and metadata.
  humanURL: https://developers.formstack.com/reference/api-overview
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Submissions
  - Data
  properties:
  - type: Documentation
    url: https://developers.formstack.com/reference/api-overview
- aid: formstack:fields
  name: Formstack Fields API
  description: Programmatically manage form fields - text, select, file upload, signature, payment, calculation, and others
    - including ordering, validation, and conditional logic.
  humanURL: https://developers.formstack.com/reference/api-overview
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Fields
  - Form Schema
  properties:
  - type: Documentation
    url: https://developers.formstack.com/reference/api-overview
- aid: formstack:webhooks
  name: Formstack Webhooks API
  description: Configure webhook subscriptions to receive submission events at a customer-provided URL, with retry semantics
    for failed deliveries.
  humanURL: https://developers.formstack.com/reference/api-overview
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Webhook
  - Event
  tags_raw:
  - Webhooks
  - Events
  properties:
  - type: Documentation
    url: https://developers.formstack.com/reference/api-overview
  - type: AsyncAPI
    url: https://raw.githubusercontent.com/api-evangelist/formstack/refs/heads/main/openapi/formstack-asyncapi.yml
- aid: formstack:folders
  name: Formstack Folders API
  description: Manage folder organization for forms within a Formstack account.
  humanURL: https://developers.formstack.com/reference/api-overview
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Folders
  - Organization
  properties:
  - type: Documentation
    url: https://developers.formstack.com/reference/api-overview
- aid: formstack:documents
  name: Formstack Documents API
  description: Programmatic interface to Formstack Documents (formerly WebMerge) for generating PDFs, Word docs, and other
    templated documents from data payloads.
  humanURL: https://developers.formstack.com/
  baseURL: https://www.webmerge.me/api
  tags:
  - Documents
  - Document Generation
  - PDF
  properties:
  - type: Documentation
    url: https://developers.formstack.com/
- aid: formstack:sign
  name: Formstack Sign API
  description: Electronic signature API for sending documents for signature, tracking status, and retrieving signed copies.
    Part of the Formstack Suite.
  humanURL: https://developers.formstack.com/
  baseURL: https://www.formstack.com/api/v2
  tags:
  - E-Signature
  - Sign
  tags_raw:
  - eSignature
  - Sign
  properties:
  - type: Documentation
    url: https://developers.formstack.com/
- aid: formstack:workflows
  name: Formstack Workflows API
  description: Workflow automation surface for routing submissions, documents, and approvals across multi-step business processes.
  humanURL: https://developers.formstack.com/
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Workflows
  - Automation
  properties:
  - type: Documentation
    url: https://developers.formstack.com/
- aid: formstack:oauth2
  name: Formstack OAuth 2.0
  description: OAuth 2.0 authorization server used to authenticate API clients and issue access tokens for the Formstack REST
    API.
  humanURL: https://developers.formstack.com/reference/oauth2-authentication
  baseURL: https://www.formstack.com/api/v2/oauth2
  tags:
  - OAuth
  - Authentication
  tags_raw:
  - OAuth2
  - Authentication
  properties:
  - type: Documentation
    url: https://developers.formstack.com/reference/oauth2-authentication
- aid: formstack:formstack-partnerapi-api
  name: Formstack Partner API
  description: PartnerApi
  humanURL: https://developers.formstack.com/reference/api-overview
  baseURL: https://www.formstack.com/api/v2
  tags:
  - Partner API
  tags_raw:
  - PartnerApi
  properties:
  - type: OpenAPI
    url: openapi/formstack-partnerapi-api-openapi.yml
common:
- type: Plans
  url: plans/formstack-plans-pricing.yml
- type: RateLimits
  url: rate-limits/formstack-rate-limits.yml
- type: FinOps
  url: finops/formstack-finops.yml
- type: AgenticAccess
  url: agentic-access/formstack-agentic-access.yml
- type: TrustCenter
  url: security/formstack-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/formstack-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/formstack-domain-security.yml
- type: Authentication
  url: authentication/formstack-authentication.yml
- type: OAuthScopes
  url: scopes/formstack-scopes.yml
- type: Website
  url: https://www.formstack.com/
- type: Documentation
  url: https://developers.formstack.com/
- type: ChangeLog
  url: https://developers.formstack.com/changelog
- type: LlmsText
  url: https://developers.formstack.com/llms.txt
- type: LinkedIn
  url: https://www.linkedin.com/company/formstack
- type: GitHub
  url: https://github.com/formstack
- type: Twitter
  url: https://twitter.com/Formstack
- url: https://www.formstack.com/blog/rss.xml
  type: Blog
integrations:
- name: Salesforce
- name: HubSpot
- name: Microsoft Dynamics 365
- name: Google Workspace
- name: Slack
- name: Stripe
- name: PayPal
- name: Zapier
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

Formstack API — frequently asked questions

Does Formstack have an API?

Yes. APIs.io lists 10 APIs from Formstack, including Formstack Forms API, Formstack Submissions API and Formstack Fields API, and 7 more.

Is there an OpenAPI specification for the Formstack API?

Yes. APIs.io indexes 1 OpenAPI specification for Formstack, each linked for download from this page.

How do I authenticate with the Formstack API?

Formstack uses bearer-token authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Formstack Authentication.

How much does the Formstack API cost?

APIs.io lists 1 pricing plan for Formstack, with each plan's price, limits and inclusions under Pricing on this page.

Is the Formstack API ready for AI agents?

Formstack has a Kin Score of 24.4 out of 100 (emerging) and an Agent Readiness score of 33.9 (agent-ready), scored by API Evangelist on 2026-11-06.

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