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.
Limited machine-readable signal and partial portal coverage — documentation a human can read, but little a machine or agent can consume without scraping.
API Evangelist profiles Formstack the way a machine reads it — 37 machine-readable artifacts across 1 API, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Formstack scores 26.6/100 (thin), with a separate agent-readiness read of 29/100 (agent ready). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance. Every facet and dimension name is a link: it opens that measurement's page on APIs.io, where the rating runs across the whole catalog — the exact checks that feed it, how every profiled provider distributes on it, and who is at the top of it.
Kin Score
How this is scored →scored 2026-09-08 · rubric v0.20.0
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<img src="https://apis.io/badge/formstack.svg"
alt="Formstack Kin Score — API readiness rating by API Evangelist" width="150" height="150" loading="lazy">
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title="Formstack on API Evangelist — API profile and Kin Score">
<img src="https://apis.io/badge/formstack/card.svg"
alt="Formstack Kin Score — API readiness rating by API Evangelist" width="340" height="120" loading="lazy">
</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Formstack
Each block below is one kind of artifact we hold for Formstack. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
APIs 17
Each API is captured as its own OpenAPI definition — every operation, parameter, and response. This is the single most useful machine-readable description of what an API does, and it's what lets us score, lint, mock, and generate against it without asking the provider for anything.
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 Confirmations API
The Confirmations API from Formstack — 2 operation(s) for confirmations.
Formstack Fields API
The Fields API from Formstack — 2 operation(s) for fields.
Formstack Folders API
The Folders API from Formstack — 2 operation(s) for folders.
Formstack Forms API
The Forms API from Formstack — 5 operation(s) for forms.
Formstack Notifications API
The Notifications API from Formstack — 2 operation(s) for notifications.
Formstack Subaccounts API
The Subaccounts API from Formstack — 1 operation(s) for subaccounts.
Formstack Submissions API
The Submissions API from Formstack — 2 operation(s) for submissions.
Formstack Webhooks API
The Webhooks API from Formstack — 2 operation(s) for webhooks.
Scroll within the panel for all 17 ·
Open Collections 11
Open, tool-agnostic collections carry the same runnable value as Postman without locking you to one client — the portable, forkable form of the same exercise.
Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
API Collection
OPEN COLLECTIONFormstack Webhooks
OPEN COLLECTIONFormstack Confirmations API
OPEN COLLECTIONFormstack Confirmations Fields API
OPEN COLLECTIONFormstack Confirmations Folders API
OPEN COLLECTIONFormstack Confirmations Forms API
OPEN COLLECTIONFormstack Confirmations Notifications API
OPEN COLLECTIONFormstack Confirmations Subaccounts API
OPEN COLLECTIONFormstack Confirmations Submissions API
OPEN COLLECTIONFormstack Confirmations Webhooks API
OPEN COLLECTIONFormstack API
OPEN COLLECTIONScroll within the panel for all 11 ·
Pricing Plans 1
Pricing is part of the interface. Machine-readable plans tell you what a tier costs and includes before you commit — one of the things the Kin Score reads for access clarity — renamed from commercial clarity in rubric 0.12, because a free statutory interface has access terms and no commercial ones.
Published pricing tiers and plan structures.
Rate Limits 1
Rate limits are the difference between a demo that works and a production integration that doesn't fall over. Publishing them is an operational-transparency signal — and a hard requirement for any agent that plans its own throughput.
Documented rate limits and quota policies.
Formstack Rate Limits
RATE LIMITSFinOps 1
Cost, billing, and metering signals let a buyer model the financial operations of an API before it's live. We profile them for the same reason we profile pricing: the money is part of the contract.
Cost, billing, and metering signals for API financial operations.
Formstack Finops
FINOPSSecurity Posture 4
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Formstack Trust Center
SOC 2, ISO 27001, ISO 27017, ISO 27018, PCI DSS, HIPAA, FedRAMP, GDPR, CSA STAR
SECURITYScopes 1
OAuth scopes are the vocabulary of least-privilege access. Profiling them shows exactly what an integration — or an agent acting on a user's behalf — is allowed to do.
OAuth scopes governing access to this provider's APIs.
Agentic Access 1
An x-agentic-access contract marks which operations are safe for an agent to run on its own and which need a human in the loop. It is the difference between an API an agent can use and one it can use safely.
Recommended x-agentic-access execution contracts for AI agents.
Resources
Every other property we hold for Formstack — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 2
MCP servers, agent skills, and machine-readable catalogs
Build 1
SDKs, sample code, and the tooling you integrate with
Access & Security 5
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Company 4
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/formstack · machine-readable index on apis.io
This is an independent, third-party profile of Formstack, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.
The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.
Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.
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you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.