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 API contracts indexed on the APIs.io network, including Accounts API, Agency Accounts API, Auth API, and 9 more. Tagged areas include Company, Compliance, RegTech, State Compliance, and Tax.

The Mosey catalog on APIs.io includes 1 Spectral governance ruleset.

Mosey’s developer surface includes documentation, API reference, engineering blog, pricing, signup flow, authentication, and 19 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

35.9/100 thin ▬ flat Agent 24/100 agent aware Front door AI 1/6 silent Heartbeat 24/100 dormant saas Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessSelf serve

3 published contracts 2 Agent Skills

Company Compliance RegTechState ComplianceTax Payroll Human Resources Business Operations

What this lets a business do 1

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Compliance Management

BC-130

Tasks

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 35.9/100 · thin

Contract Quality 7.2 / 19

Developer Ergonomics 6.3 / 15

Access Clarity 5.7 / 15

Operational Transparency 0.0 / 10

Contract Governance 1.6 / 9

Discoverability 5.9 / 8

Regulatory Posture 3.7 / 15

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 24/100 · agent aware

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

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 0 / 5

Distinct Operations 0 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Employment & Payroll regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented)
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Contract Quality scores 38.4 — up to +15.4 composite points
Operational Transparency scores 0.0 — up to +13.0 composite points
Access Clarity scores 38.2 — up to +12.4 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/mosey/apis.yml: open an issue on github.com/api-evangelist/mosey to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 2

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

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

Open Collections 12

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

Mosey Accounts API

OPEN COLLECTION

Mosey Accounts Agency Accounts API

OPEN COLLECTION

Mosey Accounts Auth API

OPEN COLLECTION

Mosey Accounts Documents API

OPEN COLLECTION

Mosey Accounts Handbook API

OPEN COLLECTION

Mosey Accounts Legal Entity API

OPEN COLLECTION

Mosey Accounts Locations API

OPEN COLLECTION

Mosey Accounts Logins API

OPEN COLLECTION

Mosey Accounts Mail API

OPEN COLLECTION

Mosey Accounts Regions API

OPEN COLLECTION

Mosey Accounts Signup API

OPEN COLLECTION

Mosey Accounts Tasks API

OPEN COLLECTION

Scroll for all 12

Agent Skills 2

Packaged agent skills for driving this provider's APIs from an AI assistant.

Monitor and resolve compliance tasks

AGENT SKILL

Onboard a legal entity and generate compliance tasks

AGENT SKILL

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Mosey API Rules

50 rules · 39 errors 6 warnings 5 info

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Mosey Openapi Overlay

3 actions · update · mosey-openapi.json

DERIVED

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

AGENTIC

Resources

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

LLMsTxt

AgenticAccess

AgenticAccess

X-MCPServerCandidate

X-MCPServerCandidate

AgentSkill

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 2

The organization behind the API

Website

Website

Blog

Blog

Other 3

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

ParentCompany

ParentCompany

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
deliveryModel:
  model: saas
  open_source: false
  commercial: true
  callable_host: true
  label: Hosted service · you call their endpoint
  confidence: high
  source:
  - openapi
  - pricing
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Self-serve signup
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-11-06'
  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
- RegTech
- State Compliance
- Tax
- Payroll
- Human Resources
- Business Operations
tags_raw:
- 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:
  - Location
  tags_raw:
  - 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: CapabilityMap
  url: capabilities/mosey-capability-edges.yml
  name: Mosey Business Capability Map
- type: Website
  url: https://www.mosey.com/
- type: ParentCompany
  url: https://apis.io/providers/gusto/
  name: Gusto
  x-relationship: acquired
  x-evidence: 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
    OpenAP
- 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: X-MCPServerCandidate
  url: mcp/mosey-mcp.yml
  note: 'Renamed from MCPServer 2026-09-03 (roadmap#247): the manifest self-describes as status: candidate — a tool list derived
    from the published API contracts, not an existing server. The scorer already read the manifest and reported mcp_server
    correctly; the MCPServer type was crediting the artifact-type surfaces with a server that does not exist.'
- 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

Mosey API — frequently asked questions

Does Mosey have an API?

Yes. APIs.io lists 12 APIs from Mosey, including Mosey Accounts API, Mosey Agency Accounts API and Mosey Auth API, and 9 more.

Is there an OpenAPI specification for the Mosey API?

Yes. APIs.io indexes 12 OpenAPI specifications for Mosey, each linked for download from this page.

How do I authenticate with the Mosey API?

Mosey uses bearer-token authentication (oauth2 · 1 scheme). The details are profiled on APIs.io as Mosey Authentication.

Is the Mosey API ready for AI agents?

Mosey has a Kin Score of 35.9 out of 100 (thin) and an Agent Readiness score of 24.3 (agent-aware), scored by API Evangelist on 2026-11-06.

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