Work Market

WorkMarket, an ADP company, is an independent contractor management platform that helps businesses organize, manage, and pay their extended workforce of 1099 contractors and freelancers. The platform covers contractor onboarding and verification, Labor Clouds for organizing talent by skill and location, assignment creation and tracking, compliance support, and fast payment processing. The WorkMarket Employer API exposes assignments, talent pools, address book, custom fields, labels, projects, and payment approval as a REST API, with webhooks, a Relay automation tool, and a certified MuleSoft connector for enterprise integration.

Work Market publishes 10 APIs on the APIs.io network, including Addressbook API, Assignments API, Authorization API, and 7 more. Tagged areas include Workforce Management, Contractors, Freelance, Gig Economy, and Human Resources.

The Work Market catalog on APIs.io includes 1 event-driven AsyncAPI specification.

Work Market’s developer surface includes documentation, API reference, getting-started guide, support, engineering blog, signup flow, sandbox, and 22 more developer resources.

🌐 Visit website 📡 Source on GitHub
55.8/100 developing ▬ flat Agent 61/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
10 APIs 1 MCP Servers
Workforce ManagementContractorsFreelanceGig EconomyHuman ResourcesPaymentsField ServicesStaffing

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 55.8/100 · developing
Contract Quality 19.8 / 25
Developer Ergonomics 15.7 / 20
Commercial Clarity 6.8 / 20
Operational Transparency 3.8 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 61/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 0 / 15
MCP Server 12 / 12
Machine-Readable Auth 10 / 10
Idempotency 0 / 9
Stable Error Semantics 8 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 0 / 7
Typed Event Surface 6 / 6
Agent Skills 5 / 5
Well-Known Catalog 4 / 4
Consent & Bot Identity 0 / 3
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/work-market: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 10

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

Work Market Addressbook API

The Addressbook API from Work Market — 5 operation(s) for addressbook.

Work Market Assignments API

The Assignments API from Work Market — 39 operation(s) for assignments.

Work Market Authorization API

The Authorization API from Work Market — 1 operation(s) for authorization.

Work Market Constants API

The Constants API from Work Market — 6 operation(s) for constants.

Work Market Custom Fields API

The Custom Fields API from Work Market — 1 operation(s) for custom fields.

Work Market Labels API

The Labels API from Work Market — 3 operation(s) for labels.

Work Market Locations API

The Locations API from Work Market — 1 operation(s) for locations.

Work Market Projects API

The Projects API from Work Market — 2 operation(s) for projects.

Work Market Talent Pools API

The Talent Pools API from Work Market — 6 operation(s) for talent pools.

Work Market UpdateCheckIn API

The UpdateCheckIn API from Work Market — 2 operation(s) for updatecheckin.

Scroll for all 10

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

work-market-mcp.yml

MCP SERVER

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Work Market Webhooks

ASYNCAPI

JSON Schema 10

Standalone JSON Schema definitions for this provider's data models.

AssignmentDetails

49 properties

JSON SCHEMA

AssignmentListItem

32 properties

JSON SCHEMA

Client

3 properties

JSON SCHEMA

CustomField

6 properties

JSON SCHEMA

Location

12 properties

JSON SCHEMA

Payment

7 properties

JSON SCHEMA

Pricing

15 properties

JSON SCHEMA

Project

2 properties

JSON SCHEMA

TalentPool

6 properties

JSON SCHEMA

Template

43 properties

JSON SCHEMA

Scroll for all 10

Security Posture 2

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

Work Market Authentication

accessToken · 1 scheme

SECURITY

Work Market Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 5

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 GettingStarted
GettingStarted
 Login
Login
 SignUp
SignUp
 Sandbox
Sandbox

Documentation 2

Reference material describing how the API behaves

Documentation
Documentation
 APIReference
APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 WellKnown
WellKnown
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 7

Pagination, idempotency, versioning, errors, and events

Webhooks
Webhooks
 Webhooks
Webhooks
 Conventions
Conventions
 DataModel
DataModel
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conformance
Conformance

Scroll for all 7

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 Postman
Postman
 Packages
Packages

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Operate 2

Status, limits, changes, and where to get help

Support
Support
 StatusPage
StatusPage

Commercial 2

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: work-market
name: Work Market
description: WorkMarket, an ADP company, is an independent contractor management platform that helps businesses organize,
  manage, and pay their extended workforce of 1099 contractors and freelancers. The platform covers contractor onboarding
  and verification, Labor Clouds for organizing talent by skill and location, assignment creation and tracking, compliance
  support, and fast payment processing. The WorkMarket Employer API exposes assignments, talent pools, address book, custom
  fields, labels, projects, and payment approval as a REST API, with webhooks, a Relay automation tool, and a certified MuleSoft
  connector for enterprise integration.
url: https://raw.githubusercontent.com/api-evangelist/work-market/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- union-square-ventures
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Self-serve signup
  confidence: medium
  source:
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://files.readme.io/df14adf-wm.dev.portal.logo.png
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Workforce Management
- Contractors
- Freelance
- Gig Economy
- Human Resources
- Payments
- Field Services
- Staffing
apis:
- aid: work-market:work-market-addressbook-api
  name: Work Market Addressbook API
  description: The Addressbook API from Work Market — 5 operation(s) for addressbook.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Addressbook
  properties:
  - type: OpenAPI
    url: openapi/work-market-addressbook-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-assignments-api
  name: Work Market Assignments API
  description: The Assignments API from Work Market — 39 operation(s) for assignments.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Assignments
  properties:
  - type: OpenAPI
    url: openapi/work-market-assignments-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-authorization-api
  name: Work Market Authorization API
  description: The Authorization API from Work Market — 1 operation(s) for authorization.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Authorization
  properties:
  - type: OpenAPI
    url: openapi/work-market-authorization-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-constants-api
  name: Work Market Constants API
  description: The Constants API from Work Market — 6 operation(s) for constants.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Constants
  properties:
  - type: OpenAPI
    url: openapi/work-market-constants-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-custom-fields-api
  name: Work Market Custom Fields API
  description: The Custom Fields API from Work Market — 1 operation(s) for custom fields.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Custom Fields
  properties:
  - type: OpenAPI
    url: openapi/work-market-custom-fields-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-labels-api
  name: Work Market Labels API
  description: The Labels API from Work Market — 3 operation(s) for labels.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Labels
  properties:
  - type: OpenAPI
    url: openapi/work-market-labels-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-locations-api
  name: Work Market Locations API
  description: The Locations API from Work Market — 1 operation(s) for locations.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Locations
  properties:
  - type: OpenAPI
    url: openapi/work-market-locations-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-projects-api
  name: Work Market Projects API
  description: The Projects API from Work Market — 2 operation(s) for projects.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Projects
  properties:
  - type: OpenAPI
    url: openapi/work-market-projects-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-talent-pools-api
  name: Work Market Talent Pools API
  description: The Talent Pools API from Work Market — 6 operation(s) for talent pools.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - Talent Pools
  properties:
  - type: OpenAPI
    url: openapi/work-market-talent-pools-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
- aid: work-market:work-market-updatecheckin-api
  name: Work Market UpdateCheckIn API
  description: The UpdateCheckIn API from Work Market — 2 operation(s) for updatecheckin.
  humanURL: https://employer-api.workmarket.com/docs
  baseURL: https://www.workmarket.com/api/v1
  tags:
  - UpdateCheckIn
  properties:
  - type: OpenAPI
    url: openapi/work-market-updatecheckin-api-openapi.yml
  - type: Documentation
    url: https://developer.workmarket.com/
  - type: APIReference
    url: https://employer-api.workmarket.com/docs
  - type: JSONSchema
    url: json-schema/work-market-assignment-details.json
  - type: JSONSchema
    url: json-schema/work-market-assignment-list-item.json
  - type: JSONSchema
    url: json-schema/work-market-talent-pool.json
  - type: JSONSchema
    url: json-schema/work-market-client.json
  - type: JSONSchema
    url: json-schema/work-market-location.json
  - type: JSONSchema
    url: json-schema/work-market-custom-field.json
  - type: JSONSchema
    url: json-schema/work-market-project.json
  - type: JSONSchema
    url: json-schema/work-market-template.json
  - type: JSONSchema
    url: json-schema/work-market-payment.json
  - type: JSONSchema
    url: json-schema/work-market-pricing.json
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/work-market-domain-security.yml
- type: Website
  url: https://workmarket.com
- type: DeveloperPortal
  url: https://developer.workmarket.com/
- type: Documentation
  url: https://developer.workmarket.com/docs
- type: APIReference
  url: https://employer-api.workmarket.com/docs
- type: GettingStarted
  url: https://developer.workmarket.com/page/best-practices
- type: Support
  url: https://workmarket.zendesk.com/hc/en-us
- type: Blog
  url: https://www.workmarket.com/blog
- type: GitHubOrganization
  url: https://github.com/workmarket-oss
- type: StatusPage
  url: https://status.workmarket.com
- type: TermsOfService
  url: https://www.workmarket.com/tos
- type: PrivacyPolicy
  url: https://www.workmarket.com/privacy
- type: Login
  url: https://www.workmarket.com/login
- type: SignUp
  url: https://www.workmarket.com/contractors/join-workmarket
- type: Postman
  url: https://www.getpostman.com/collections/e4829238bea777d8995a
- type: Webhooks
  url: https://developer.workmarket.com/page/webhooks
- type: Webhooks
  url: asyncapi/work-market-webhooks.yml
- type: LLMsTxt
  url: llms/work-market-llms.txt
- type: WellKnown
  url: well-known/work-market-well-known.yml
- type: Packages
  url: packages/work-market-packages.yml
- type: MCPServer
  url: mcp/work-market-mcp.yml
- type: Sandbox
  url: sandbox/work-market-sandbox.yml
- type: Conventions
  url: conventions/work-market-conventions.yml
- type: DataModel
  url: data-model/work-market-data-model.yml
- type: ErrorCatalog
  url: errors/work-market-problem-types.yml
- type: Lifecycle
  url: lifecycle/work-market-lifecycle.yml
- type: Authentication
  url: authentication/work-market-authentication.yml
- type: Conformance
  url: conformance/work-market-conformance.yml
- type: AgentSkill
  url: skills/_index.yml
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 29
  pass: local-v1