Mosey

Mosey is a business compliance platform that helps multi-state companies open and manage state and local tax, HR, payroll, insurance, and registration accounts. The Mosey API is a composable set of OpenAPI 3.1 endpoints that let software platforms embed state compliance into their own products: sign up or authenticate a legal entity, register the states it operates in, generate and resolve compliance tasks, receive physical mail, and securely manage state-agency logins via short-lived hosted sessions. Authentication is OAuth2 (password grant). Mosey partnered with Gusto, Stripe, and Sequoia Consulting Group and was subsequently acquired by Gusto. This profile was surfaced as a Canaan Partners portfolio company and enriched by the API Evangelist pipeline from Mosey's public OpenAPI and developer documentation.

Mosey publishes 12 APIs on the APIs.io network, including Accounts API, Agency Accounts API, Auth API, and 9 more. Tagged areas include Company, Compliance, Regulatory Technology, State Compliance, and Tax.

Mosey’s developer surface includes documentation, API reference, engineering blog, pricing, signup flow, authentication, and 16 more developer resources.

🌐 Visit website 📡 Source on GitHub
41.9/100 thin ▬ flat Agent 65/100 agent native Full breakdown ↓
scored 2026-07-27 · rubric v0.5
AccessSelf serve
12 APIs 1 MCP Servers
CompanyComplianceRegulatory TechnologyState ComplianceTaxPayrollHRBusiness Operations

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5
Composite quality — 41.9/100 · thin
Contract Quality 12.5 / 25
Developer Ergonomics 10.4 / 20
Commercial Clarity 8.9 / 20
Operational Transparency 0.0 / 13
Governance 0.0 / 12
Discoverability 10.0 / 10
Agent readiness — 65/100 · agent native
Machine-Readable Contract 18 / 18
Agentic Access Contract 15 / 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 0 / 6
Agent Skills 5 / 5
Well-Known Catalog 0 / 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/mosey: 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 12

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

Mosey Accounts API

The Accounts API from Mosey — 7 operation(s) for accounts.

Mosey Agency Accounts API

The Agency Accounts API from Mosey — 2 operation(s) for agency accounts.

Mosey Auth API

The Auth API from Mosey — 2 operation(s) for auth.

Mosey Documents API

The Documents API from Mosey — 1 operation(s) for documents.

Mosey Handbook API

The Handbook API from Mosey — 3 operation(s) for handbook.

Mosey Legal Entity API

The Legal Entity API from Mosey — 2 operation(s) for legal entity.

Mosey Locations API

The Locations API from Mosey — 7 operation(s) for locations.

Mosey Logins API

The Logins API from Mosey — 4 operation(s) for logins.

Mosey Mail API

The Mail API from Mosey — 2 operation(s) for mail.

Mosey Regions API

The Regions API from Mosey — 2 operation(s) for regions.

Mosey Signup API

The Signup API from Mosey — 3 operation(s) for signup.

Mosey Tasks API

The Tasks API from Mosey — 9 operation(s) for tasks.

Scroll for all 12

MCP Servers 1

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

mosey-mcp.yml

MCP SERVER

Security Posture 2

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

Mosey Authentication

oauth2 · 1 scheme

SECURITY

Mosey Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Mosey Agentic Access

52 operations · 29 acting

52 operations · 29 acting

AGENTIC

Resources

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal
DeveloperPortal
 SignUp
SignUp
 Login
Login

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
 AgenticAccess
AgenticAccess
 MCPServer
MCPServer
 AgentSkill
AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 ErrorCatalog
ErrorCatalog
 Lifecycle
Lifecycle
 Conventions
Conventions
 Components
Components
 DataModel
DataModel

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Authentication
Authentication

Commercial 3

Pricing, plans, and the legal terms of use

Pricing
Pricing
 TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy

Company 1

The organization behind the API

Blog
Blog

Other 1

Properties that don't map to a standard resource type

Overlay
Overlay

Source (apis.yml)

apis.yml Raw ↑ 
aid: mosey
name: Mosey
description: 'Mosey is a business compliance platform that helps multi-state companies open and manage state and local tax,
  HR, payroll, insurance, and registration accounts. The Mosey API is a composable set of OpenAPI 3.1 endpoints that let software
  platforms embed state compliance into their own products: sign up or authenticate a legal entity, register the states it
  operates in, generate and resolve compliance tasks, receive physical mail, and securely manage state-agency logins via short-lived
  hosted sessions. Authentication is OAuth2 (password grant). Mosey partnered with Gusto, Stripe, and Sequoia Consulting Group
  and was subsequently acquired by Gusto. This profile was surfaced as a Canaan Partners portfolio company and enriched by
  the API Evangelist pipeline from Mosey''s public OpenAPI and developer documentation.'
url: https://raw.githubusercontent.com/api-evangelist/mosey/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- canaan-partners
x-tier: stub
x-tier-reason: portfolio-lead
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
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-20'
x-enrichment:
  date: '2026-07-20'
  status: enriched
  artifacts_added: 18
  pass: local-v1
image: https://mosey.com/favicon.ico
tags:
- Company
- Compliance
- Regulatory Technology
- State Compliance
- Tax
- Payroll
- HR
- Business Operations
apis:
- aid: mosey:mosey-accounts-api
  name: Mosey Accounts API
  description: The Accounts API from Mosey — 7 operation(s) for accounts.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Accounts
  properties:
  - type: OpenAPI
    url: openapi/mosey-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-agency-accounts-api
  name: Mosey Agency Accounts API
  description: The Agency Accounts API from Mosey — 2 operation(s) for agency accounts.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Agency Accounts
  properties:
  - type: OpenAPI
    url: openapi/mosey-agency-accounts-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-auth-api
  name: Mosey Auth API
  description: The Auth API from Mosey — 2 operation(s) for auth.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Auth
  properties:
  - type: OpenAPI
    url: openapi/mosey-auth-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-documents-api
  name: Mosey Documents API
  description: The Documents API from Mosey — 1 operation(s) for documents.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Documents
  properties:
  - type: OpenAPI
    url: openapi/mosey-documents-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-handbook-api
  name: Mosey Handbook API
  description: The Handbook API from Mosey — 3 operation(s) for handbook.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Handbook
  properties:
  - type: OpenAPI
    url: openapi/mosey-handbook-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-legal-entity-api
  name: Mosey Legal Entity API
  description: The Legal Entity API from Mosey — 2 operation(s) for legal entity.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Legal Entity
  properties:
  - type: OpenAPI
    url: openapi/mosey-legal-entity-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-locations-api
  name: Mosey Locations API
  description: The Locations API from Mosey — 7 operation(s) for locations.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Locations
  properties:
  - type: OpenAPI
    url: openapi/mosey-locations-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-logins-api
  name: Mosey Logins API
  description: The Logins API from Mosey — 4 operation(s) for logins.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Logins
  properties:
  - type: OpenAPI
    url: openapi/mosey-logins-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-mail-api
  name: Mosey Mail API
  description: The Mail API from Mosey — 2 operation(s) for mail.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Mail
  properties:
  - type: OpenAPI
    url: openapi/mosey-mail-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-regions-api
  name: Mosey Regions API
  description: The Regions API from Mosey — 2 operation(s) for regions.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Regions
  properties:
  - type: OpenAPI
    url: openapi/mosey-regions-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-signup-api
  name: Mosey Signup API
  description: The Signup API from Mosey — 3 operation(s) for signup.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Signup
  properties:
  - type: OpenAPI
    url: openapi/mosey-signup-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
- aid: mosey:mosey-tasks-api
  name: Mosey Tasks API
  description: The Tasks API from Mosey — 9 operation(s) for tasks.
  humanURL: https://docs.mosey.com/api-reference/introduction
  baseURL: https://api.mosey.com
  tags:
  - Tasks
  properties:
  - type: OpenAPI
    url: openapi/mosey-tasks-api-openapi.yml
  - type: Documentation
    url: https://docs.mosey.com/api-reference/introduction
  - type: APIReference
    url: https://docs.mosey.com/api-reference/introduction
  - type: Authentication
    url: authentication/mosey-authentication.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/mosey-domain-security.yml
- type: DeveloperPortal
  url: https://docs.mosey.com
- type: Documentation
  url: https://docs.mosey.com/api-reference/introduction
- type: APIReference
  url: https://docs.mosey.com/api-reference/introduction
- type: Blog
  url: https://mosey.com/blog/
- type: Pricing
  url: https://mosey.com/pricing/
- type: SignUp
  url: https://app.mosey.com/signup
- type: Login
  url: https://app.mosey.com/login
- type: TermsOfService
  url: https://mosey.com/terms-of-service/
- type: PrivacyPolicy
  url: https://mosey.com/privacy-policy/
- type: LLMsTxt
  url: llms/mosey-llms.txt
- type: Authentication
  url: authentication/mosey-authentication.yml
- type: AgenticAccess
  url: agentic-access/mosey-agentic-access.yml
- type: MCPServer
  url: mcp/mosey-mcp.yml
- type: Overlay
  url: overlays/mosey-openapi-overlay.yaml
- type: Conformance
  url: conformance/mosey-conformance.yml
- type: ErrorCatalog
  url: errors/mosey-problem-types.yml
- type: Lifecycle
  url: lifecycle/mosey-lifecycle.yml
- type: Conventions
  url: conventions/mosey-conventions.yml
- type: Components
  url: components/mosey-components.yml
- type: DataModel
  url: data-model/mosey-data-model.yml
- type: AgentSkill
  url: skills/_index.yml