How AI is applied across API Evangelist and APIs.io. Read my AI disclosure →
API Evangelist API Evangelist
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Mavenlink Custom Fields API

The [Custom Fields](https://mavenlink.zendesk.com/hc/en-us/articles/202924760-Custom-Fields-Overview-#arrange) object allows you toview, create, update, and delete extra fields for additional Estimate, Project, Group, Resource, Task, and User information.If Custom Fields represent the fields themselves, [Custom Field Values](/tag/Custom-Field-Values)represent the values in/of those fields.

Mavenlink Custom Fields API is one of 103 APIs that Mavenlink publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Custom Fields. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, authentication docs, and rate-limit docs.

This API exposes 4 operations across 2 paths, and defines 7 schemas. It is described by OpenAPI 3.2.0, at version 1.0.0.

Requests are made against a single base URL, https://api.mavenlink.com/api/v1.

4 operations 2 paths 7 schemas 1 DELETE1 GET1 POST1 PUT

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0.0
Base URL
https://api.mavenlink.com/api/v1/
Authentication
API Key, OAuth 2.0
Terms of Service
Resource Areas
1

Authentication & Security 2

Mavenlink Custom Fields API declares 2 security schemes for authenticating requests. An API key is passed in the header as Bearer (BearerToken). It supports OAuth 2.0 (OauthSecurity) using the authorizationCode flow.

Paths & Operations 4

Across 2 paths, the API surfaces 4 operations — 1 DELETE, 1 GET, 1 POST, 1 PUT. Each is listed below with its method, path, parameters, and response codes.

Custom Fields 4

The [Custom Fields](https://mavenlink.zendesk.com/hc/en-us/articles/202924760-Custom-Fields-Overview-arrange) object allows you to view, create, update, and delete extra fields fo…

GET
/custom_fields
Fetching a list of Custom Fields
Get Custom Fields 20 params → 200400401403404422503
POST
/custom_fields
Creating a new Custom Field
Create Custom Field 1 param body → 200400401403404422503
PUT
/custom_fields/{id}
Updating an existing Custom Field
Update Custom Field 2 params body → 200400401403404422503
DELETE
/custom_fields/{id}
Deleting an existing Custom Field
Delete Custom Field 1 param → 204400401403404422503

Schemas 7

The contract defines 7 schemas that model the data the API accepts and returns. The most detailed are User (20 properties), ExternalReference (14 properties), CustomField (12 properties), CustomFieldChoice (6 properties). Each schema is shown below with its type and property counts.

ExternalReference
object
External References allows users see which objects (one of Assignment, BillingMilestone, CustomField, CustomFieldChoice, CustomFieldSet, CustomFieldValue, Esti…
14 properties
Error
object
2 properties
CustomFieldSet
object
Custom Field Sets contain custom fields and definitions of each fields' subject type. The supported subjects are currently Estimate, Project, Project Group, Re…
6 properties
CustomFieldChoice
object
Custom Field Choices are possible values for single and multi type custom fields.
6 properties
User
object
Users represent the individuals that are participating in Kantata OX projects. User objects are often returned as nested JSON objects within other returned ite…
20 properties
CustomField
object
The [Custom Fields](https://mavenlink.zendesk.com/hc/en-us/articles/202924760-Custom-Fields-Overview-arrange) object allows you to view, create, update, and de…
12 properties
Errors
object
1 property

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

mavenlink-custom-fields-api-openapi.yml Raw ↑

Other APIs Mavenlink publishes across the network.

Kantata OX MCP Server
Kantata OX Developer Documentation Agent
Mavenlink Access Group Memberships API
Mavenlink Account Colors API
Mavenlink Account Invitations API
Mavenlink Account Locations API
Mavenlink Account Memberships API
Mavenlink Activations API
Mavenlink Assignments API
Mavenlink Attachments API
Mavenlink Backup Approver Associations API
Mavenlink Billable Utilizations API
Where this information came from

This is an independent, third-party profile of Mavenlink Custom Fields API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

info@apievangelist.com · Read the full data-sourcing policy →
On a security or compliance team? Put security in the subject line and you will get a person, not a form — we will tell you exactly which public URLs this profile was built from.