Justworks
Justworks is a New York City-based Professional Employer Organization (PEO) and small-business HR platform. It bundles payroll, tax filing, multi-state compliance, large-group medical/dental/vision benefits, 401(k) administration, workers comp, time tracking, and HR consulting into a single per-employee-per-month subscription. Justworks operates four primary products: Justworks Payroll (standalone payroll), Justworks PEO Basic, Justworks PEO Plus (PEO with included benefits package), and Justworks EOR International for hiring full-time employees abroad without a local entity. Justworks exposes a Partner API at public-api.justworks.com for approved integration partners, covering Members, Company, Payroll, Paystubs, Deductions, Time Off, and Webhooks. The API uses OAuth 2.0 authorization-code grant, cursor pagination, signed at-least-once webhooks, and zero-decimal currency representation. Deductions is the primary write surface; everything else is read-only.
Real signal across most facets with visible, nameable gaps — the contract exists but is thin, or the portal is good while governance and commercial terms are absent.
API Evangelist profiles Justworks the way a machine reads it — 52 machine-readable artifacts across 11 APIs, 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 — Justworks scores 59.3/100 (developing), with a separate agent-readiness read of 48/100 (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.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Justworks
Each block below is one kind of artifact we hold for Justworks. 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 11
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.
Justworks Members API
Read employee, contractor, and member information from the Justworks Partner API. Provides access to member profiles, employment history, pay history, custom-field values, and U...
Justworks Company API
Read company-level data from the Justworks Partner API including company identity, departments, offices, bank account on file (masked), verified business information, custom-fie...
Justworks Deductions API
Manage employee deductions — list deduction types, create one-time and recurring deductions, update existing deductions, and cancel deductions in bulk. The primary write surface...
Justworks Webhooks API
Manage Justworks Partner API webhooks. Justworks signs every request, delivers events at-least-once with automatic retries, and closes a webhook on sustained failures (resumable...
Justworks OAuth API
OAuth 2.0 token endpoints for the Justworks Partner API. Authorization code is the only supported grant for initial token acquisition; refresh token grant is supported for renew...
Justworks Deduction Types API
Read access to Justworks deduction type catalog
Justworks Payrolls API
Read access to payroll runs and per-payroll fees
Justworks Paystubs API
Read access to per-member paystubs
Justworks Time Off Balances API
Asynchronous balance reports for time-off policies
Justworks Time Off Policies API
Read access to time-off policy catalog
Justworks Time Off Requests API
Read access to time-off requests submitted by members
Scroll within the panel for all 11 ·
Open Collections 7
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).
Justworks Company API
OPEN COLLECTIONJustworks Deductions API
OPEN COLLECTIONJustworks Members API
OPEN COLLECTIONJustworks OAuth API
OPEN COLLECTIONJustworks Payroll API
OPEN COLLECTIONJustworks Time Off API
OPEN COLLECTIONJustworks Webhooks API
OPEN COLLECTIONScroll within the panel for all 7 ·
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 six things the Kin Score reads for commercial clarity.
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.
Justworks 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.
Justworks Finops
FINOPSFeatures 18
The notable capabilities this provider advertises, captured as structured features so they can be searched and compared instead of read one landing page at a time.
Notable capabilities this provider offers.
Scroll within the panel for all 18 ·
Semantic Vocabularies 1
JSON-LD contexts give the data shared meaning across APIs. We profile them because semantics are what let a machine reconcile 'customer' here with 'customer' somewhere else.
JSON-LD contexts and semantic vocabularies used across these APIs.
Justworks Context
JSON-LDSpectral Rules 1
Governance rulesets we run against this provider's specs — the automated checks behind parts of the score. Profiling them makes the quality bar explicit and re-runnable, not a matter of opinion.
Justworks API Rules
SPECTRALJSON Schema 6
Standalone JSON Schema definitions describe the data models behind the API. We profile them so the shapes are validatable on their own — useful long after a single request is forgotten.
Standalone JSON Schema definitions for this provider's data models.
Justworks Deduction
JSON SCHEMAJustworks Member
JSON SCHEMAJustworks Payroll
JSON SCHEMAJustworks Paystub
JSON SCHEMAJustworks Time Off Request
JSON SCHEMAJustworks Webhook Event
JSON SCHEMASecurity Posture 3
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.
Scopes 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 Justworks — 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.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
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
Learn 1
Tutorials, courses, talks, and written guidance
Operate 2
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 7
The organization behind the API
Scroll within the panel for all 7 ·
Other 1
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/justworks · machine-readable index on apis.io