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

37.2/100 thin ▬ flat Agent 36/100 agent ready Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

AccessSelf serve

12 APIs 1 MCP Servers

Company Compliance Regulatory TechnologyState ComplianceTax Payroll HR Business Operations

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 37.2/100 · thin

Contract Quality 11.0 / 25

Developer Ergonomics 8.5 / 20

Access Clarity 7.6 / 20

Operational Transparency 0.0 / 13

Contract Governance 2.0 / 12

Discoverability 8.2 / 10

Agent readiness — 36/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

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.

Open Collections 13

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

MCP Servers 1

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

Get Started 3

Portal, sign-up, and the first successful call

DeveloperPortal

DeveloperPortal

SignUp

SignUp

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

AgenticAccess

MCPServer

AgentSkill

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Conformance

ErrorCatalog

Lifecycle

Conventions

Components

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)

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: '0.23'
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:
  - Account
  tags_raw:
  - 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:
  - Authentication
  tags_raw:
  - 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:
  - Sign Up
  tags_raw:
  - 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:
  - Task
  tags_raw:
  - 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

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
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.

All 92 tools

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/mosey"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/mosey/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/mosey/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.