aid: karbonhq

name: Karbon

description: Karbon is accounting practice management software for accounting firms, built to enhance visibility, efficiency, and connectivity
  for a firm no matter where its people are located. Through the Karbon Developer Center (developers.karbonhq.com) it publishes a public REST
  API reference plus guides covering authentication, pagination, rate limits, webhooks, work items, clients, custom fields, budgets and time,
  invoices and payments, and file uploads.

url: https://raw.githubusercontent.com/api-evangelist/karbonhq/refs/heads/main/apis.yml

x-type: company

x-source: harvest:spectral-ruleset-github

x-tier: profiled
x-tier-reason: enrichment pass 2026-10-09 (modular-v1; was harvest)

specificationVersion: '0.20'

created: '2026-10-09'

modified: '2026-10-09'

tags:
- Company
- Accounting
- Practice Management
- Workflow
- Collaboration
- Professional Services
- SaaS

maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io

image: https://karbonhq.com/images/og-default-image.jpg

common:
- type: AgenticAccess
  url: agentic-access/karbonhq-agentic-access.yml
- type: RateLimits
  url: rate-limits/karbonhq-rate-limits.yml
- type: Plans
  url: plans/karbonhq-plans-pricing.yml
- type: Spectral
  url: rules/karbonhq-rules.yml
- type: Spectral
  url: rules/karbonhq-karbon-api-reference-spectral-rules.yml
- type: JSONLD
  url: json-ld/karbonhq-context.jsonld
- type: Vocabulary
  url: vocabulary/karbonhq-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: Webhooks
  url: asyncapi/karbonhq-webhooks.yml
- type: DataModel
  url: data-model/karbonhq-data-model.yml
- type: ChangeLog
  url: changelog/karbonhq-changelog.yml
- type: Conventions
  url: conventions/karbonhq-conventions.yml
- type: Deprecation
  url: lifecycle/karbonhq-lifecycle.yml
- type: Lifecycle
  url: lifecycle/karbonhq-lifecycle.yml
- type: ErrorCatalog
  url: errors/karbonhq-problem-types.yml
- type: Conformance
  url: conformance/karbonhq-conformance.yml
- type: Overlay
  url: overlays/karbonhq-karbon-api-overlay.yaml
- type: LLMsTxt
  url: llms/karbonhq-llms.txt
- type: SecurityTxt
  url: well-known/karbonhq-security.txt
- type: WellKnown
  url: well-known/karbonhq-well-known.yml
- type: Hosts
  url: hosts/karbonhq-hosts.yml
- type: Vendors
  url: vendors/karbonhq-vendors.yml
- type: Authentication
  url: authentication/karbonhq-authentication.yml
- type: VulnerabilityDisclosure
  url: security/karbonhq-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/karbonhq-domain-security.yml
- type: Website
  url: https://karbonhq.com/
- type: SpectralRules
  url: https://github.com/karbonhq/karbon-api-reference/blob/57cc9814d7cc6bc697895d0bfe52b0c422684d3c/vacuum-rules.yaml
- type: DeveloperPortal
  url: https://developers.karbonhq.com/
- type: APIReference
  url: https://karbonhq.github.io/karbon-api-reference/
- type: Documentation
  url: https://developers.karbonhq.com/
- type: Authentication
  url: https://developers.karbonhq.com/guides/authentication/
- type: ChangeLog
  url: https://developers.karbonhq.com/release-notes/2026-09-23/
- type: Support
  url: https://help.karbonhq.com/
- type: StatusPage
  url: https://status.karbonhq.com/
- type: GitHubOrganization
  url: https://github.com/karbonhq
- type: Pricing
  url: https://karbonhq.com/pricing/
- type: GettingStarted
  url: https://karbonhq.com/get-started
- type: Login
  url: https://app2.karbonhq.com/signin
- type: TermsOfService
  url: https://karbonhq.com/terms/
- type: PrivacyPolicy
  url: https://karbonhq.com/privacy-policy/
- type: Security
  url: https://karbonhq.com/security/
- type: Leadership
  url: https://karbonhq.com/leadership/
- type: About
  url: https://karbonhq.com/about/

apis:
- aid: karbonhq:karbonhq-billing-api
  name: Karbon Billing API
  description: List and view an Invoice and associated line items
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Billing
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-billing-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-business-cards-api
  name: Karbon Business Cards API
  description: View or update the Business Card attached to a Contact and/or Organization
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Business Cards
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-business-cards-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-client-groups-api
  name: Karbon Client Groups API
  description: >-
    Create a client group to manage related contacts, create work for them, and see all related jobs in
    a single view. [Read more](https://help.karbonhq.com/en/articles/5880261-manage-a-client-group)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Client Groups
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-client-groups-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-comments-api
  name: Karbon Comments API
  description: >-
    Use comments on tasks to add notes or bring a colleague into the conversation to collaborate on the
    task. [Read more](https://help.karbonhq.com/en/articles/2111192-comment-and-collaborate-on-a-task)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Comments
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-comments-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-contacts-api
  name: Karbon Contacts API
  description: >-
    Manage your contacts and get the full overview over clients, whether they are individuals or organizations.
    [Read more](https://help.karbonhq.com/en/articles/5708609-overview-of-contacts)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Contacts
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-contacts-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-custom-fields-api
  name: Karbon Custom Fields API
  description: >-
    Endpoints to manage Custom Fields on Contacts and Organizations in Karbon, refer to the Karbon help
    and support content for more information on [creating custom fields](https://help.karbonhq.com/en/articles/10971113-create-a-new-custom-contact-field)
    and [frequently asked questions](https://help.karbonhq.com/en/articles/10971266-custom-contact-fields-faqs)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Custom Fields
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-custom-fields-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-estimate-summaries-api
  name: Karbon Estimate Summaries API
  description: >-
    Estimate and track time to understand jobs that are on-budget, allocate resources, and uncover performance
    insights to transform your firm. [Read more](https://help.karbonhq.com/en/articles/4439115-overview-of-time-budgets)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Estimate Summaries
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-estimate-summaries-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-files-api
  name: Karbon Files API
  description: >-
    Handle files and attachments. [Read more](https://help.karbonhq.com/en/articles/5714089-files-and-attachments)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Files
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-files-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-integrated-workflows-api
  name: Karbon Integrated Workflows API
  description: >-
    Endpoints that enable Karbon Integration Partners to manage integrated workflow tasks enabled for
    their integrations. Note that these endpoints cannot be used to access Tasks or Client Tasks. Access
    is limited to approved developers building apps that serve all Karbon customers.
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Integrated Workflows
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-integrated-workflows-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-notes-api
  name: Karbon Notes API
  description: >-
    Hold a conversation internally within your company. Unlike an email, Notes are viewed only by members
    of your team. [Read more](https://help.karbonhq.com/en/s/articles/5919746-use-notes)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Notes
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-notes-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-organizations-api
  name: Karbon Organizations API
  description: >-
    Create an organization to represent marriages and couples and client groups to represent families.
    [Read more](https://help.karbonhq.com/en/articles/5708609-overview-of-contacts#h_8ee87bfcc1)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Organizations
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-organizations-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-tenant-settings-api
  name: Karbon Tenant Settings API
  description: Retrieve lists of valid Contact Types, Work Types and Work Statuses
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Tenant Settings
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-tenant-settings-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-timesheets-and-time-entries-api
  name: Karbon Timesheets and Time Entries API
  description: >-
    Retrieve individual (non-aggregated) time entries, each record represents a single time entry for
    a specific day, user, and work item. [Read more](https://help.karbonhq.com/en/s/articles/6022358-managing-time-budgets-and-expenses-in-karbon).

    **Deprecated** Review Time aggregate Timesheets for colleagues. [Read more](https://help.karbonhq.com/en/s/articles/6022358-managing-time-budgets-and-expenses-in-karbon)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Timesheets and Time Entries
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-timesheets-and-time-entries-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-users-api
  name: Karbon Users API
  description: >-
    Create and view the basics & defaults for colleagues, teams and job roles to customize Karbon to represent
    the way you and your team work. [Read more](https://help.karbonhq.com/en/articles/3731216-edit-your-user-profile)
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Users
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-users-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-webhook-payloads-api
  name: Karbon Webhook Payloads API
  description: Details of the different payloads sent for Karbon Webhook subscriptions
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Webhook Payloads
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-webhook-payloads-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-request-schema.json
- aid: karbonhq:karbonhq-webhook-subscriptions-api
  name: Karbon Webhook Subscriptions API
  description: >-
    Integrate your system with Karbon to receive changes made to your data in Karbon.


    Note: Webhook payloads take the following form:


    ```JSON

    {
      "ResourcePermaKey": "{EntityKey}",
      "ResourceType": "{EntityType}",
      "ActionType": "{ActionType}"
      "TimeStamp": "{YYYY-MM-DDTHH:mm:ssZ}"
    }

    ```
  humanURL: https://developers.karbonhq.com/
  baseURL: https://api.karbonhq.com
  tags:
  - Webhook Subscriptions
  properties:
  - type: OpenAPI
    url: openapi/karbonhq-webhook-subscriptions-api-openapi.yml
  - type: APIReference
    url: https://karbonhq.github.io/karbon-api-reference/
  - type: Documentation
    url: https://developers.karbonhq.com/
  - type: JSONSchema
    url: json-schema/karbonhq-get-work-schedule-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-work-schedule-request-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-contact-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-business-card-schema.json
  - type: JSONSchema
    url: json-schema/karbonhq-response-create-client-group-schema.json
  - type: JSONSchema
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    url: json-schema/karbonhq-response-create-client-group-schema.json
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