HubSync

HubSync is an AI-powered, end-to-end tax and accounting workflow platform built for CPA firms, founded in 2019 by John McGowan and headquartered in Franklin, Tennessee. The SaaS platform unifies the engagement lifecycle in one interface: engagement letter generation and tracking, tax organizers and prepared-by-client data collection, document management, e-signature (including IRS Form 8879), batch federal and state extensions, tax return breakup and delivery, e-file status tracking, web-based tax workpapers, firm analytics dashboards, and integrated bill-and-pay. Its HubSync Halo layer adds agentic AI orchestration across those stages. HubSync publishes an llms.txt and states that it ships a Model Context Protocol (MCP) server and bi-directional API integrations with CCH Axcess/ProSystem fx, Thomson Reuters GoSystem/UltraTax and SurePrep, but it publishes no public developer portal, API reference, OpenAPI description or endpoint documentation — the entire integration surface is provisioned per customer firm.

HubSync is profiled on the APIs.io network. Tagged areas include Company, Tax, Accounting, Workflow Automation, and Document Management.

HubSync’s developer surface includes engineering blog, support, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub
15.5/100 emerging ▬ flat Agent 6/100 agent aware Full breakdown ↓
scored 2026-08-25 · rubric v0.14.0
0 APIs 1 MCP Servers
CompanyTaxAccountingWorkflow AutomationDocument ManagementElectronic SignatureProfessional ServicesArtificial IntelligenceModel Context ProtocolSaaS

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-08-25 · rubric v0.14.0
Composite quality — 15.5/100 · emerging
Contract Quality 0.0 / 25
Developer Ergonomics 1.4 / 20
Access Clarity 5.8 / 20
Operational Transparency 0.3 / 13
Contract Governance 2.2 / 12
Discoverability 5.7 / 10
Agent readiness — 6/100 · agent aware
Machine-Readable Contract 0 / 18
Agentic Access Contract 0 / 10
Documented Reversibility 0 / 6
MCP Server 12 / 12
Machine-Readable Auth 0 / 10
Idempotency 0 / 9
Stable Error Semantics 0 / 8
Request/Response Examples 0 / 7
Rate-Limit Signaling 7 / 7
Typed Event Surface 0 / 6
Agent Skills 0 / 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 Surface 0 / 5
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/hubsync: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

MCP Servers 1

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

HubSync MCP Server

MCP SERVER

Pricing Plans 1

Published pricing tiers and plan structures.

Hubsync Plans Pricing

0 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Hubsync Rate Limits

0 limits

RATE LIMITS

Security Posture 1

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

Hubsync Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Resources

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt
LLMsTxt
 MCPServer
MCPServer

Design & Contract 2

Pagination, idempotency, versioning, errors, and events

Conformance
Conformance
 Lifecycle
Lifecycle

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity
 Compliance
Compliance

Operate 2

Status, limits, changes, and where to get help

Support
Support
 RateLimits
RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

TermsOfService
TermsOfService
 PrivacyPolicy
PrivacyPolicy
 Plans
Plans

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: hubsync
name: HubSync
description: 'HubSync is an AI-powered, end-to-end tax and accounting workflow platform built for CPA firms, founded in 2019
  by John McGowan and headquartered in Franklin, Tennessee. The SaaS platform unifies the engagement lifecycle in one interface:
  engagement letter generation and tracking, tax organizers and prepared-by-client data collection, document management, e-signature
  (including IRS Form 8879), batch federal and state extensions, tax return breakup and delivery, e-file status tracking,
  web-based tax workpapers, firm analytics dashboards, and integrated bill-and-pay. Its HubSync Halo layer adds agentic AI
  orchestration across those stages. HubSync publishes an llms.txt and states that it ships a Model Context Protocol (MCP)
  server and bi-directional API integrations with CCH Axcess/ProSystem fx, Thomson Reuters GoSystem/UltraTax and SurePrep,
  but it publishes no public developer portal, API reference, OpenAPI description or endpoint documentation — the entire integration
  surface is provisioned per customer firm.'
image: https://hubsync.com/hubfs/HubSync_primary-logo-white-color.svg
url: https://raw.githubusercontent.com/api-evangelist/hubsync/refs/heads/main/apis.yml
x-type: company
x-source: harvest:secondary-market
specificationVersion: '0.20'
created: '2026-08-22'
modified: '2026-08-22'
tags:
- Company
- Tax
- Accounting
- Workflow Automation
- Document Management
- Electronic Signature
- Professional Services
- Artificial Intelligence
- Model Context Protocol
- SaaS
apis: []
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: DomainSecurity
  url: security/hubsync-domain-security.yml
- type: Website
  url: https://hubsync.com/
- type: Blog
  url: https://hubsync.com/blog
- type: Support
  url: https://hubsync.com/contact-us
- type: GitHubOrganization
  url: https://github.com/hubsync
- type: TermsOfService
  url: https://hubsync.com/terms-of-use
- type: PrivacyPolicy
  url: https://hubsync.com/privacy-policy
- type: LLMsTxt
  url: llms/hubsync-llms.txt
- type: MCPServer
  url: mcp/hubsync-mcp.yml
- type: Conformance
  url: conformance/hubsync-conformance.yml
- type: Compliance
  url: conformance/hubsync-conformance.yml
- type: Plans
  url: plans/hubsync-plans-pricing.yml
- type: RateLimits
  url: rate-limits/hubsync-rate-limits.yml
- type: Lifecycle
  url: lifecycle/hubsync-lifecycle.yml
x-enrichment:
  date: '2026-08-22'
  status: minimal
  artifacts_added: 8
  pass: local-v1
x-coverage:
  state: gated
  reason: customer-only-docs
  detail: 'HubSync markets an MCP server and bi-directional REST integrations with CCH Axcess, Thomson Reuters and SurePrep,
    but its only documentation host is a Docsie portal whose content API answers {"error": "Invalid token."} without a customer
    token, its Integrations and MCP shelves are absent from the public sitemap, and each CPA firm''s tenant at <firm>.hubsync.com
    refuses anonymous requests with HTTP 403 — so no contract, endpoint or tool list is reachable without an active firm subscription.'
  evidence:
  - url: https://api.docsie.io/api_v2/006/deployment/deployment_SEgpqVq42BLzmcNdl/
    status: 403
  - url: https://eisneramper.hubsync.com/
    status: 403
  - url: https://hubsync.com/openapi.json
    status: 404
  - url: https://docs.hubsync.com/?doc=release-notes/release-notes
    status: 200
  checked: '2026-08-22'

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