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
Discovery
Learnings
Guidance
Toolbox
Alignment
API Evangelist LLC

Need help?

Contact us
Marketo

Marketo Custom Objects API

Upsert (insert or update) custom object records

Documentation Provider Profile APIs.io OpenAPI GitHub

Marketo Custom Objects API is one of 45 APIs that Marketo publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

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

This API exposes 18 operations across 16 paths, and defines 31 schemas. It is described by OpenAPI 3.2.0, at version 1.0.

Requests are made against 2 base URLs: https://mkto-ingestion-api.adobe.io, https://localhost:8080/.

18 operations 16 paths 31 schemas 8 GET10 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.2.0
API Version
1.0
Base URL
https://{munchkinId}.mktorest.com/rest
Resource Areas
1

Paths & Operations 18

Across 16 paths, the API surfaces 18 operations — 8 GET, 10 POST. Each is listed below with its method, path, parameters, and response codes.

Custom Objects 18

Upsert (insert or update) custom object records

POST
/subscriptions/{munchkinId}/customobjects/{customObjectAPIName}
Sync Custom Objects
syncCustomObjects 5 params body → 202400401
GET
/rest/v1/customobjects.json
List Custom Objects
listCustomObjectsUsingGET 1 param → 200
GET
/rest/v1/customobjects/{customObjectName}.json
Get Custom Objects
getCustomObjectsUsingGET 6 params body → 200
POST
/rest/v1/customobjects/{customObjectName}.json
Sync Custom Objects
syncCustomObjectsUsingPOST 1 param body → 200
POST
/rest/v1/customobjects/{customObjectName}/delete.json
Delete Custom Objects
deleteCustomObjectsUsingPOST 1 param body → 200
GET
/rest/v1/customobjects/{customObjectName}/describe.json
Describe Custom Objects
describeUsingGET_1 1 param → 200
GET
/rest/v1/customobjects/schema.json
List Custom Object Types
listCustomObjectTypesUsingGET 2 params → 200
POST
/rest/v1/customobjects/schema.json
Sync Custom Object Type
syncCustomObjectTypeUsingPOST body → 200
POST
/rest/v1/customobjects/schema/{apiName}/approve.json
Approve Custom Object Type
approveCustomObjectTypeUsingPOST 1 param → 200
POST
/rest/v1/customobjects/schema/{apiName}/discardDraft.json
Discard Custom Object Type Draft
discardCustomObjectTypeUsingPOST 1 param → 200
POST
/rest/v1/customobjects/schema/{apiName}/delete.json
Delete Custom Object Type
deleteCustomObjectTypeUsingPOST 1 param → 200
GET
/rest/v1/customobjects/schema/{apiName}/describe.json
Describe Custom Object Type
describeCustomObjectTypeUsingGET 2 params → 200
POST
/rest/v1/customobjects/schema/{apiName}/addField.json
Add Custom Object Type Fields
addCustomObjectTypeFieldsUsingPOST 1 param body → 200
POST
/rest/v1/customobjects/schema/{apiName}/deleteField.json
Delete Custom Object Type Fields
deleteCustomObjectTypeFieldsUsingPOST 1 param body → 200
POST
/rest/v1/customobjects/schema/{apiName}/{fieldApiName}/updateField.json
Update Custom Object Type Field
updateCustomObjectTypeFieldUsingPOST 2 params body → 200
GET
/rest/v1/customobjects/schema/fieldDataTypes.json
Get Custom Object Type Field Data Types
getCustomObjectTypeFieldDataTypesUsingGET → 200
GET
/rest/v1/customobjects/schema/linkableObjects.json
Get Custom Object Linkable Objects
getCustomObjectTypeLinkableObjectsUsingGET → 200
GET
/rest/v1/customobjects/schema/{apiName}/dependentAssets.json
Get Custom Object Dependent Assets
getCustomObjectTypeDependentAssetsUsingGET 1 param → 200

Schemas 31

The contract defines 31 schemas that model the data the API accepts and returns. The most detailed are ObjectMetaData (13 properties), ResponseOfCustomObject (7 properties), ResponseOfObjectMetaData (7 properties), AddCustomObjectTypeField (6 properties). Each schema is shown below with its type and property counts.

SyncCustomObjectsRequest
object
3 properties 1 required
CustomObject
object
Custom object record. Fields depend on the custom object schema definition.
ErrorResponse
object
Error response body returned for non-202 responses.
2 properties
ObjectMetaData
object
13 properties 13 required
DeleteCustomObjectRequest
object
2 properties 1 required
SyncCustomObjectRequest
object
3 properties 1 required
ResponseOfCustomObject
object
7 properties 5 required
ResponseOfObjectLinkableObject
object
5 properties 5 required
Reason
object
2 properties 2 required
RelatedObject
object
2 properties 2 required
Error
object
2 properties 2 required
CustomObject_2
object
3 properties 2 required
LookupCustomObjectRequest
object
5 properties 1 required
DeleteCustomObjectTypeField
object
1 property 1 required
CustomObjectTypeFieldRelatedTo
object
2 properties 2 required
ObjectField
object
6 properties
ObjectLinkableObjectField
object
3 properties 3 required
ResponseOfCustomObjectType
object
5 properties 5 required
DeleteCustomObjectTypeFieldsRequest
object
1 property 1 required
ResponseOfObjectDependentAssets
object
5 properties 5 required
ResponseOfCustomObjectTypeFieldDataTypes
object
5 properties 5 required
Warning
object
2 properties 2 required
ObjectLinkableObject
object
3 properties 3 required
AddCustomObjectTypeField
object
6 properties 3 required
UpdateCustomObjectTypeFieldRequest
object
6 properties
ObjectRelation
object
3 properties 3 required
ResponseOfObjectMetaData
object
7 properties 5 required
SyncCustomObjectTypeRequest
object
6 properties 2 required
Empty
ObjectDependentAsset
object
4 properties 3 required
AddCustomObjectTypeFieldsRequest
object
1 property 1 required

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

marketo-custom-objects-api-openapi.yml Raw ↑

Other APIs Marketo publishes across the network.

Marketo Campaigns API
AE Profile APIs.io
Marketo Channels API
AE Profile APIs.io
Marketo Email Templates API
AE Profile APIs.io
Marketo Emails API
AE Profile APIs.io
Marketo File Contents API
AE Profile APIs.io
Marketo Files API
AE Profile APIs.io
Marketo Folders API
AE Profile APIs.io
Marketo Form Fields API
AE Profile APIs.io
Marketo Forms API
AE Profile APIs.io
Marketo Landing Page Content API
AE Profile APIs.io
Marketo Landing Page Redirect Rules API
AE Profile APIs.io
Marketo Landing Page Templates API
AE Profile APIs.io
#Custom Objects
← Back to M APIs
API Details
ID
marketo:marketo-custom-objects-api
Base URL
https://{munchkinId}.mktorest.com/rest
Docs
https://experienceleague.adobe.com/en/docs/marketo-developer/marketo/rest/rest-api
Provider
Marketo
APIs.io →  GitHub →
Explore more
All APIs Providers APIs.io Network
Work with this as data

Every API here is available over the API and to AI agents over MCP. APIs is not yet its own endpoint on the v1 API. Reach this content through network search and the tag graph, or the MCP server below.

Installs https://mcp.apievangelist.com/mcp in Claude, Cursor, VS Code and the rest — one button, every client.

MCP tools for apis
4 tools reach this content
  • search_api_evangelistSearch every content type across the network at once.
  • find_relatedThe shared-tag relevance graph — what else covers this.
  • get_tagEverything one tag labels, across all content types.
  • guide_topicPRO — a curated bundle for a topic: area, guidance, rules, papers, stories, services.
All tools & prompts
Call it yourself
curl for this page
Search the network for this 
curl "https://api.apievangelist.com/v1/search?q=marketo-custom-objects-api&limit=10"
Everything under a tag 
curl "https://api.apievangelist.com/v1/tags/marketo-custom-objects-api"

Discovery needs no key. Full bodies and the synthesis endpoints are Pro.

Get an API key

Free tier, no email required. Sign in with whichever identity you already have.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have. Your account

Where this information came from

This is an independent, third-party profile of Marketo Custom Objects 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.