Check
Check is an embedded payroll infrastructure platform that allows vertical SaaS, HR, workforce management, and financial services companies to natively offer payroll inside their own products. Check provides a comprehensive REST API, a library of white-labeled React components (Check Components and Check Onboard), a CLI, and a Model Context Protocol (MCP) server that together cover company and employee onboarding, pay schedules, payroll preview and approval, contractor payments, tax calculation, multi-state withholdings, tax filings, tax deposits, money movement, paystubs, garnishments, post-tax deductions, net pay splits, benefits (health, 401k, workers' comp), W-2 and 1099 generation, and webhook event delivery. Check operates in all 50 U.S. states plus D.C., has been incubated and led-funded by Stripe (Series B and Series C), and powers payroll for partners such as Homebase, ServiceTitan, 7shifts, Housecall Pro, Wave, Zoho, and Procare — collectively paying more than 1M employees across 35,000+ businesses and moving $15B+ annually.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Check the way a machine reads it — 12 machine-readable artifacts across 4 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 — Check scores 20.7/100 (emerging), with a separate agent-readiness read of 20/100 (agent aware). 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 2026-09-10 · rubric v0.20.0
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</a>More shapes, themes and sizes → · Score as JSON · How badges work
How we profile Check
Each block below is one kind of artifact we hold for Check. 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 4
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.
Check Payroll API
The Check Payroll API is a comprehensive REST API for embedding end-to-end U.S. payroll inside another platform. It models companies, workplaces, employees, contractors, pay sch...
Check Components
Check Components is a library of white-labeled, drop-in React UI elements that handle the highest-friction surfaces of embedded payroll — company onboarding, terms of service, b...
Check MCP Server
The Check MCP Server exposes the Check Payroll API to AI tools and agents via the Model Context Protocol. It is offered as both a hosted (remote) endpoint requiring no infrastru...
Check CLI
The Check Command-Line Interface is a Python-based CLI installed via the uv package manager that exposes 270 functions across 18 resource groups of the Check Payroll API. It is ...
MCP Servers 1
Model Context Protocol servers expose these APIs directly to AI agents. We profile them because agent-native access is the fastest-growing way this provider's capabilities actually get used.
Model Context Protocol servers that expose these APIs to AI agents.
MCP Server
MCP SERVERSecurity Posture 2
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.
Solutions 5
Packaged solutions the provider offers on top of the raw API surface.
Packaged solutions this provider offers.
Startups
Drop-in Components let early-stage platforms launch payroll quickly without bespoke UI.
Enterprise Platforms
Flexible API enables deeply customized payroll experiences for large vertical SaaS and workforce platforms.
Workforce Management
Couple scheduling and timekeeping with end-to-end payroll, taxes, and money movement.
Vertical SaaS
Embed native payroll inside industry-specific software for trades, hospitality, fitness, and more.
Accounting and Financial Management
Sync payroll journals and tax events into accounting platforms with workplace breakdowns.
Resources
Every other property we hold for Check — 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 3
Portal, sign-up, and the first successful call
Documentation 2
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 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Company 5
The organization behind the API
Other 2
Properties that don't map to a standard resource type
← All providers · Data indexed from github.com/api-evangelist/check-hq · machine-readable index on apis.io
This is an independent, third-party profile of Check, 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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