Karbon HQAPIintegration&MCPserver

Deliver real-time HR & Directory faster, close sales deals sooner, and scale without an integration backlog.

Add Karbon HQ to your app See feature support

Try free for 30 days, no credit card required

Add Karbon HQ and 76 other pre-built HR & Directory integrations

Real-time data to fuel countless HR use cases

Power AI copilots, insights, predictive analysis, and automation with a modern integration infrastructure that scales alongside you.

hris

Onboarding

Onboard employees and update profiles when roles change.

Learn More

hris

Offboarding

Seamlessly integrate employee data to automate the offboarding processess.

Learn More

hris

Track PTO

Pull time off (PTO) information to monitor and manage employee leave balances and schedules in real-time.

Learn More

Unified API data-models and methods

Hris Employee

list get create

Hris Company

list get create update

Passthrough

get post put patch delete

79 Unified MCP tools

create an employee

create_hris_employee32 parameters

list all employees

list_hris_employees3 parameters

retrieve an employee

get_hris_employee2 parameters

create a company

create_hris_company4 parameters

list all companies

list_hris_companies3 parameters

retrieve a company

get_hris_company2 parameters

update a company

update_hris_company5 parameters

get a list of integration task definitions

external__list_integration_task_defintions0 parameters

get a list of integration tasks

external__list_integration_tasks2 parameters

get an integration task details

external__get_integration_task2 parameters

update an integration task

external__update_integration_task11 parameters

gets a list of invoices

external_get_invoices3 parameters

gets a single invoice

external_get_invoice_by_key3 parameters

gets a list of payments

external_get_payments2 parameters

create a manual payment against an invoice

external_create_manual_payment0 parameters

delete a manual payment

external_delete_manual_payment2 parameters

reverse a manual payment

external_reverse_manual_payment0 parameters

gets a single payment

external_get_payment_by_payment_key2 parameters

gets a single business card

external_get_business_card_by_key2 parameters

updates a single business card

external_update_business_card_by_key15 parameters

gets a list of client groups

external_get_client_groups4 parameters

creates a new client group

external_create_client_group12 parameters

gets a client group using userdefinedidentifier

external_get_client_group_by_u_d_i3 parameters

gets a client group using clientgroupkey

external_get_client_group_by_i_d3 parameters

updates a client group (full)

external_put_client_group_by_i_d12 parameters

updates a client group (partial)

external_patch_client_group_by_i_d3 parameters

gets a comment using commentkey

external_get_comment2 parameters

gets a list of contacts

external_get_all_contacts4 parameters

creates a new contact

external_create_contact15 parameters

gets a contact using userdefinedidentifier

external_get_contact_by_u_d_i3 parameters

gets a contact using contactkey

external_get_contact_by_i_d3 parameters

updates a contact (full)

external_put_contact_by_i_d17 parameters

updates a contact (partial)

external_patch_contacts_by_i_d8 parameters

gets all custom field definitions for the current tenant

external__get_custom_field_definitions0 parameters

creates a new custom field definition

external__create_custom_field_definition5 parameters

deletes a custom field definition by key

external__delete_custom_field_definition2 parameters

gets custom field values for a specific entity

external__get_custom_field_values2 parameters

updates custom field values for a specific entity

external__update_custom_field_values4 parameters

gets estimate summaries using workitemkey

external_get_estimate_summaries_by_work_item_key2 parameters

uploads and links a file

external_create_file8 parameters

get a file using it's token

external_download_file1 parameters

get a list of files for a given entity

external_list_files3 parameters

gets a note using noteid

external_get_note_by_note_key2 parameters

creates a new note

external_create_note7 parameters

gets a list of organizations

external_get_all_organizations4 parameters

creates a new organization

external_create_organization10 parameters

gets an organization using userdefinedidentifier

external_get_organization_by_u_d_i3 parameters

gets an organization using organizationkey

external_get_organization_by_i_d3 parameters

updates an organization (full)

external_put_organization_by_i_d12 parameters

updates an organization (partial)

external_patch_organization_by_i_d4 parameters

assigns one or more tags to an entity

external_add_tags3 parameters

removes one or more tags to an entity

external_remove_tags2 parameters

gets lists of customer specific contact and work settings

external_get_tenant_settings0 parameters

gets a list of timesheets

external_get_all_timesheets5 parameters

gets a timesheets using timesheetkey

external_get_timesheet_by_i_d3 parameters

gets a list of users

external_get_all_users3 parameters

creates a new user

external_create_user2 parameters

gets the details of a single user

external_get_user_by_id2 parameters

gets a webhook subscription

external_get_webhook_subscriptions_by_webhook_type2 parameters

deletes a webhook subscription

external_del_webhook_subscriptions_by_webhook_type2 parameters

creates a new webhook subscription

external_create_webhook_subscription3 parameters

deletes all webhook subscriptions

external_del_all_webhook_subscriptions0 parameters

gets a list of work items

external_get_all_work_items4 parameters

creates a new work item

external_create_work_item17 parameters

gets a work item using workitemkey

external_get_work_item_by_i_d2 parameters

updates a work item (full)

external_put_work_item_by_i_d19 parameters

updates a work item (partial)

external_patch_work_item_by_i_d2 parameters

creates a new work schedule

external_create_work_schedule15 parameters

gets a work schedule using workschedulekey

external_get_work_schedule_by_i_d2 parameters

updates a work schedule (full)

external_put_work_schedule_by_i_d18 parameters

gets a list of work templates

external_get_all_work_templates4 parameters

gets a work template using worktemplatekey

external_get_work_template_by_i_d2 parameters

contact created or updated

external_create_contact4 parameters

estimate summary updated

external_create_estimate_summary4 parameters

integration task created

external_create_integration_task7 parameters

invoice status updated

external_create_invoice4 parameters

note created or updated

external_create_note4 parameters

user has accepted karbon invite

external_create_user4 parameters

work created or updated

external_create_work4 parameters

The modern Unified API platform, built differently

Real-time, pass-through

Every request hits the source API live. No caching, no sync jobs, no stale data — just on-demand API reads/writes with native and virtual webhooks for instant updates.

Zero-storage by design

We never store end-customer data. Traffic is stateless and regionalized (US/EU/AU), reducing compliance scope and eliminating data-at-rest risk.

One API, deeply normalized

360+ integrations, 21 categories... Unified objects, endpoints, scopes, and errors—plus raw payload passthrough when you need provider-specific fields.

Custom fields & objects

Go beyond shallow schemas. We support custom fields and read/write on custom objects (e.g., Salesforce) via unified metadata APIs.

AI-ready integrations

Built for AI products: real-time streams for RAG/embeddings and Unified MCP tools that securely grant LLMs controlled integration access.

Predictable pricing, no lock-in

Transparent usage-based pricing that scales with API volume—not customers. Own your credentials and migrate anytime.

Add a Karbon HQ integration to your application in hours

1Test drive integrations

Effortlessly test API calls, explore endpoints, and try out the Karbon HQ integration using synthetic data in our Sandbox environment.

2Authorize connections

Drop in our Authorization component with a single line of code. Your users can then connect and grant access to their Karbon HQ data.

3Start making API calls

Use the Connection ID to interact with Karbon HQ via our unified API. We handle maintenance and updates so you can focus on your product.

Seamless Auth, no extra work

Unified.to removes the complexity of authentication and authorization so you can focus on building your product, not managing auth flows. Our pre-built UI and flexible API handle everything in the background—no extra setup required.

See documentation

React

React component React component source code

Trusted by global product companies and developers to power integrations for innovative AI and SaaS applications

5 stars on G2

Integrate with all the major hr & directory applications

Unified.to makes it possible to integrate once to a unified API to connect with all the applications your customers use, so you can train AI models, build advanced automation, and expand your market.

Start testing for free