> ## Documentation Index
> Fetch the complete documentation index at: https://docs.unifygtm.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Standard objects and attributes
> Reference the built-in attributes that ship with Unify's standard objects.
## Overview
Unify provides a set of **standard objects** that ship with built-in attributes.
The most commonly used standard objects are **Company**, **Person**,
**Opportunity**, and **User**, documented below.
Each attribute has an **API name** (used in API requests and responses) and a
[value type](/reference/objects/value-types). You can extend any standard object
with [custom attributes](/reference/objects/define-attributes), and you can link
objects to one another with [reference](/reference/objects/value-types#reference)
attributes.
These tables list the attributes that ship by default. A workspace may add
custom attributes, so for the authoritative, live set on an object, list its
attributes via the API:
```http theme={null}
GET /data/v1/objects/{object_name}/attributes
```
A few attributes are **read-only** and maintained by Unify. They appear in
records and query results but cannot be set directly through the API.
## Company
The **Company** object (`company`) represents an organization or business
entity, such as a customer, competitor, or partner.
| API name | Value type | Required | Description |
| :------------------------- | :----------- | :------- | :-------------------------------------------------------------------------------------- |
| `name` | Text | | Name of the company. |
| `domain` | URL | Yes | Website domain. Normalized and deduplicated — see the note below. |
| `description` | Text | | Description of the company. |
| `industry` | Text | | Industry the company operates in. |
| `employee_count` | Integer | | Estimated employee count. |
| `revenue` | Currency | | Estimated revenue. |
| `founded` | Date | | Date the company was founded. |
| `address` | Address | | Physical address of the company. |
| `time_zone` | Time zone | | Time zone the company is located in. |
| `corporate_phone` | Phone number | | Corporate phone number. |
| `linkedin_url` | URL | | LinkedIn company profile. Standardized to `https://www.linkedin.com/company//`. |
| `status` | Text | | Status of the company. |
| `lead_source` | Text | | Source of the company record. |
| `do_not_contact` | Boolean | | Whether contacting this company is disallowed. |
| `record_owner` | Reference | | The user that owns the record. References the **User** object. |
| `hubspot_url` | URL | | HubSpot record URL for the company. |
| `salesforce_url` | URL | | Salesforce record URL for the company. |
| `last_activity_at` | Datetime | | Last time any activity was recorded for the company. Read-only. |
| `last_website_activity_at` | Datetime | | Last time a website activity was recorded for the company. Read-only. |
The `domain` attribute has special validation and preprocessing to prevent
duplicate company records. The domain is normalized (protocol and path are
stripped). See
[Attribute value types](/reference/objects/value-types#url) for details.
## Person
The **Person** object (`person`) represents an individual who interacts with
your business, such as a prospect, customer, or contact at a partner company.
| API name | Value type | Required | Description |
| :------------------------- | :------------ | :------- | :------------------------------------------------------------------------- |
| `email` | Email address | Yes | Email address of the person. |
| `first_name` | Text | | First name of the person. |
| `last_name` | Text | | Last name of the person. |
| `title` | Text | | Job title of the person. |
| `company` | Reference | | Company the person is associated with. References the **Company** object. |
| `address` | Address | | Physical address of the person. |
| `time_zone` | Time zone | | IANA time zone identifier derived from the person's address. Read-only. |
| `mobile_phone` | Phone number | | Mobile phone number. |
| `work_phone` | Phone number | | Work phone number. |
| `corporate_phone` | Phone number | | Corporate phone number. |
| `phone_numbers` | Phone number | | Additional phone numbers associated with the person. Returns a list. |
| `linkedin_url` | URL | | LinkedIn profile. Standardized to `https://www.linkedin.com/in//`. |
| `status` | Text | | Status of the person. |
| `lead_source` | Text | | Source of the person record. |
| `do_not_call` | Boolean | | Whether calling this person is disallowed. |
| `do_not_email` | Boolean | | Whether emailing this person is disallowed. |
| `email_opt_out` | Boolean | | Whether the person has opted out of email communications. |
| `eu_resident` | Boolean | | Whether the person is a resident of the European Union. |
| `record_owner` | Reference | | The user that owns the record. References the **User** object. |
| `hubspot_url` | URL | | HubSpot record URL for the person. |
| `salesforce_url` | URL | | Salesforce record URL for the person. |
| `last_activity_at` | Datetime | | Last time any activity was recorded for the person. Read-only. |
| `last_website_activity_at` | Datetime | | Last time a website activity was recorded for the person. Read-only. |
## Opportunity
The **Opportunity** object (`opportunity`) represents a deal or potential
business relationship. Opportunities can carry a monetary value and a stage, and
can be linked to companies and people.
| API name | Value type | Required | Description |
| :-------------------- | :--------- | :------- | :-------------------------------------------------------------------------- |
| `name` | Text | Yes | Name of the opportunity. |
| `uniqueness_key` | Text | Yes | Unique identifier used to distinguish this opportunity from others. |
| `amount` | Currency | | Monetary value associated with the opportunity. |
| `stage` | Text | | Stage of the opportunity in the sales process (such as "open" or "closed"). |
| `opportunity_type` | Text | | Type of the opportunity. |
| `company` | Reference | | Company associated with the opportunity. References the **Company** object. |
| `person` | Reference | | Person associated with the opportunity. References the **Person** object. |
| `lead_source` | Text | | Source of the opportunity. |
| `record_owner` | Reference | | The user that owns the record. References the **User** object. |
| `original_created_at` | Datetime | | Date when the opportunity was originally opened. |
| `hubspot_url` | URL | | HubSpot record URL for the opportunity. |
| `salesforce_url` | URL | | Salesforce record URL for the opportunity. |
## User
The **User** object (`user`) represents a member of your Unify workspace. Users
are referenced by the `record_owner` attribute on other objects to indicate who
owns a record.
| API name | Value type | Required | Description |
| :----------- | :------------ | :------- | :------------------------- |
| `email` | Email address | Yes | Email address of the user. |
| `first_name` | Text | | First name of the user. |
| `last_name` | Text | | Last name of the user. |
Unlike other standard objects, the **User** object does not support custom
attributes.
## What's next
Learn how each value type behaves and what it accepts.
Fetch the live set of attributes on any object via the API.