Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 8 Complete, well-documented, and agent-ready

LinkedIn Talent Solutions APIThe LinkedIn Talent Solutions API provides access to recruiting and talent management capabilities. It enab...77.8 QuickBooks Payroll and Time APIThe QuickBooks Payroll and Time API provides programmatic access to payroll and time-tracking data within Q...70.8 Employment Hero REST APIVersioned REST API (v1) for accessing Employment Hero HR, payroll, and employee data including organisation...70.7 Oracle Fusion Cloud HCM REST APIREST APIs for viewing and managing human capital management data including workers, talent management, payr...70.4 Dynamics 365 Human Resources APIAPI for managing human resources operations including employee data, payroll integration, applicant trackin...67.7 Microsoft Dynamics 365 Human Resources APIThe Human Resources API from Microsoft Dynamics 365 — 1 operation(s) for human resources.67.7 Deputy Hr APIThe Hr API from Deputy — 4 operation(s) for hr.67.1 Nordlet Hr APIThe hr API from Nordlet — 35 operation(s) for hr.66.7

Strong 6 Solid coverage with minor gaps

Zoho PeopleThe Zoho People API allows you to integrate HR modules with third-party applications, extracting employee d...63.7 Zoho RecruitThe Zoho Recruit API provides REST endpoints with JSON format and OAuth2.0 authentication for integrating r...63.7 ServiceNow HR APIThe ServiceNow HR API provides REST endpoints for managing Human Resources Service Delivery (HRSD) data inc...61.9 Gloat Customer APITenant-scoped REST API to sync users, jobs, candidacies, projects, learning items, and the Skills Foundatio...59.2 SAP SuccessFactors APIHuman Capital Management APIs for employee central, recruiting, and talent management.58.3 Deskera People APIAPI for Deskera People, the HR, payroll and employee-self-service product — employees, teams, shifts, atten...56.2

Developing 25 Usable, with meaningful gaps to close

Factorial ATS APIApplicant Tracking surface — Candidates, Applications, Application Phases, Job Postings, Feedback, Evaluati...53.3 Factorial Attendance APIManage attendance shifts, breaks, overtime requests, timesheet edits, and attendance reviews. v2026-04-01 i...53.3 Factorial Contracts and Compensations APIManage contract versions and compensation records. v2026-04-01 is a breaking-change release that removes le...53.3 Factorial Developer APIVersioned REST API for managing employees, contracts, leaves, attendance shifts, time off, documents, and o...53.3 Factorial Documents APIManage company- and employee-scoped documents and folders. Create, update, retrieve, and delete documents, ...53.3 Factorial Job Catalog APIJob levels, roles, functions, and the hierarchical Job Catalog Tree introduced in v2026-01-01. Replaces the...53.3 Factorial Locations and Holidays APICompany locations, work areas, and company holidays.53.3 Factorial Payroll APIPayroll supplements, payroll identifiers, family situations, and bookkeeper resources. Backs Factorial's in...53.3 Factorial Performance APIPerformance reviews, review processes, evaluations, and performance agreements. Configurable review cycles ...53.3 Factorial Time Off APITime-off leaves, leave types, and time-off allowances with enriched statistics. Trigger webhooks on leave c...53.3 Factorial Trainings APIManage training programs and training classes, expanded in v2026-04-01 with new class-level capabilities.53.3 Factorial Webhooks APISubscribe to lifecycle events fired by Factorial (employee created, employee terminated, attendance clock-i...53.3 Veryfi W-9 APIThe Veryfi W-9 API extracts structured data from W-9 Request for Taxpayer Identification forms including TI...49.4 University of Helsinki Human Resources APIThe Human Resources API from University of Helsinki — 1 operation(s) for human resources.48.6 StackOne Unified HRIS API (Legacy)Legacy (no longer in active development; existing functionality remains supported). StackOne Unified HRIS A...47.8 Workday Studio Human Resources APIWeb service operations for managing employee data, worker records, organizational structures, and HR transa...46.6 ADP Benefits Administration APIThe ADP Benefits Administration API provides access to employee benefits enrollment, eligibility, and plan ...45.6 Cambridge API Gateway (Card / Student / HR)UIS API Gateway (ALPHA) publishing read-oriented REST APIs — University Card, University Student (CamSIS-so...45.6 Justworks Company APIRead company-level data from the Justworks Partner API including company identity, departments, offices, ba...45.0 Justworks Members APIRead employee, contractor, and member information from the Justworks Partner API. Provides access to member...45.0 Justworks Webhooks APIManage Justworks Partner API webhooks. Justworks signs every request, delivers events at-least-once with au...45.0 Codat Sync for Payroll APIThe Codat Sync for Payroll API enables HR, payroll, and vertical SaaS platforms to integrate their customer...41.8 볼테나 HR 모듈 필요 APIHR 모듈 계약이 있어야 호출됩니다41.2 Common Good APIsA suite of APIs published by the OIT Integrations Team over the University's Common Data Layer — person, cl...40.8 BambooHR REST APIRESTful HTTPS API for accessing and manipulating employee data, directories, time-off, reports, and other B...40.7

Thin 18 Limited public surface area

Oxford recruitment (CoreHR tenancy)Vacancies were once part of Oxford's own open-data programme; they are now a CoreHR application reached thr...34.8 AlayaCare Employee APIREST API for managing employee records including staff information, designations, departments, and employee...34.3 Planday APIPlanday's REST API secured by OAuth2 bearer tokens, separated into domains (HR, Absence, Pay, Payroll, Port...34.3 ALEX Partner Integration APIThe ALEX Partner Integration API lets a Jellyvision partner — typically a benefits administration or enroll...33.3 Paylocity Integrations REST APIREST API for managing employees, demographics, status, pay rates, direct deposit, deductions, earnings, tax...32.4 AML & Sanctions Verification APICheck a name against sanctions and AML screening data, with optional date of birth, country, and result lim...30.7 ApyHub HR APIThe HR API from ApyHub — 10 operation(s) for hr.30.7 Public Holidays APIGet public holidays by country and year, plus the supported country list. Use it for business-day logic, sc...30.7 Resume Optimize Document APIOptimize resume text or uploaded PDF/DOCX files with optional target skills. Useful for tailoring a CV to a...30.7 Resume Parsing & Analysis APIParse resume files or text into structured output for ATS, screening, and candidate data workflows.30.7 Skill Based Resume Screening APIScreen resumes from text or uploaded PDF/DOCX files using minimum years and required skills. Use it to auto...30.7 Working Day Calculator APICount working days between two dates for a country. Returns total days, weekends, holidays, and working_day...30.7 TIAA Payroll360 APITIAA Payroll360 enables direct API connections between HR and payroll systems and TIAA's plan administratio...30.3 Breathe HR REST APIJSON REST API for managing employees, absences, holidays, sick leaves, accounts, and related HR records ins...29.9 Holded REST APIREST API for managing invoicing, contacts, products, accounting, projects, employees, and CRM records insid...27.2 Grab For Business Partner APIThe Grab For Business Partner API supports corporate travel, expense, and HR platforms that need to provisi...26.5 SAP SuccessFactors OData V2 APIOData V2 REST API for HXM Suite covering Employee Central, Recruiting, Onboarding, Compensation, Learning, ...26.2 SAP SuccessFactors OData V4 APIOData V4 REST API for HXM Suite providing CRUD access to Employee Central, talent management, learning, and...26.2

Emerging 17 Early or largely undocumented

UKG Pro HCM APIREST API for the UKG Pro HCM suite covering people, benefits, payroll, talent, recruiting, onboarding, and ...25.1 Cornerstone Employee and OU APISynchronize employee records and organizational unit (OU) structures between external systems and Cornersto...24.8 peopleIX MCPThe hosted, remote Model Context Protocol server through which peopleIX exposes a customer's People Intelli...23.1 Unit4 ERPx REST APIComprehensive REST API for Unit4 ERPx cloud ERP platform covering time and expenses, personnel, payroll, pr...22.2 Miter REST APIMiter exposes a REST API used to build custom integrations between the Miter HCM platform and construction ...20.8 Velocity Global APIREST API for managing global employment operations including international hiring, employee records, payrol...20.1 Rates and Limits JSON APIKeyless, unauthenticated REST-style JSON API serving US tax, payroll, benefits, and wage figures with bundl...18.7 TriNet Company APIThe TriNet Company API provides access to company-level HR data including organizational structure, departm...18.0 TriNet Employees APIThe TriNet Employees API provides full lifecycle employee data management including retrieving all employee...18.0 TriNet Manage Employee APIThe TriNet Manage Employee API enables management of employee roles and access permissions within the TriNe...18.0 TriNet Payroll APIThe TriNet Payroll API provides access to employee payroll and compensation data including pay rates, pay f...18.0 Heartland Payroll APIHeartland's Payroll APIs support employee payroll processing, tax filings, and HR integrations for small to...15.0 Chief Human Capital Officers Council ResourcesThe CHCO Council publishes its charter, leadership roster, working group output, policy memoranda, and fede...14.1 Insperity Core APICompany-scoped reference data. Some Insperity API fields require specific values as defined in Insperity Pr...13.9 Insperity HRIS APITransfer employee information to and from Insperity Premier. Twenty-six published operations — fifteen name...13.9 Insperity Onboarding APIUse your own applicant tracking or HR application to send candidate hire information to Insperity Premier O...13.9 Dolibarr REST APIREST API for the Dolibarr ERP/CRM platform providing full CRUD operations on business objects including con...13.4

Companies reaching this through an API (20)

These companies publish an API, specification or operation carrying “Human Resources” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Score breakdown

Frequency

70.2

log-scaled weighted occurrences

Breadth

6.5

spread across providers

Quality lift

23.5

mean composite of providers using it

Cohesion

26.7

strength of nearest seed neighbor

Where this tag sits

501 providers carry this tag directly, and 836 counting the 16 narrower tags below and the 2 beneath them — 335 more to reach.

Applicant Tracking 66 providers ATS Integration 12 providers Compensation 30 providers Employee Management 14 providers Leave Management 13 providers People Analytics 25 providers Talent Acquisition 62 providers Talent Management 24 providers Time and Attendance 19 providers Recruiting 278 providers Hiring 136 providers HCM 34 providers HRIS 45 providers Employee Engagement 47 providers Employer of Record 27 providers Employee Benefits 186 providers

Where this tag comes from

Provider tag501

Api tag74

Openapi tag6

Openapi op tag20

Markets provisional

Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.

Market	Share of the market's providers
HR and Payroll	76%
HCM and Payroll Marketplaces (ADP, Workday, UKG, Paylocity)	61%

Cohort brief

Auto-generated

The 463 providers in the APIs.io catalog tagged Human Resources, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

463

of 501 in the catalog

Mean Kin Score

24.6

+0.5 vs catalog 24.1

Mean Agent Readiness

12.5

-1.6 vs catalog 14.1

Spread

0–77.3

median 20.1 · σ 17.7

How the 463 split by band

Exemplar 10Strong 33Developing 57Thin 75Emerging 173Minimal 115

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Access Clarity	36	30	+6	463
Discoverability	59.5	59.1	+0.4	463
Contract Governance	9.9	9.7	+0.2	463
Contract Quality	18.7	18.6	+0.1	463
Operational Transparency	12.9	13.2	-0.3	463
Developer Ergonomics	21.4	24.5	-3.1	463

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	14%	18%	-4
MCP server (first-party)	13%	16%	-3
Agent Skills	0%	0%	0
OAuth scopes	15%	13%	+2
Security	98%	99%	-1
Arazzo workflows	1%	1%	0
Governance rules	35%	36%	-1

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Greenhouse 77.3
2 Employment Hero 70.7
3 Remote 70.4
4 Culture Amp 68.9
5 360Learning 68.6
6 Visier 68.6
7 Connecteam 68.4
8 recruitmcp-com 68.3
9 Fama 67.6
10 Deputy 67.1

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Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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Human Resources

Providers using this tag (501)

APIs with this tag (74)