Kit · OpenAPI Overlay 1.0.0
API Evangelist conversational phrasing for Kit Custom Fields API
7 actions
7 updates
phrasing
extends
openapi/convertkit-custom-fields-api-openapi.yml
Generated by API Evangelist
Written by API Evangelist tooling for Kit's API. It is a proposal applied on top of the contract, not a document Kit publishes.
What the actions change
x-apievangelist-phrasing
Targets 7
$.info
$.paths['/v4/bulk/custom_fields'].post
$.paths['/v4/bulk/custom_fields/subscribers'].post
$.paths['/v4/custom_fields'].get
$.paths['/v4/custom_fields'].post
$.paths['/v4/custom_fields/{id}'].put
$.paths['/v4/custom_fields/{id}'].delete
OpenAPI Overlay
# Generated by API Evangelist (build-phrasing.py). Our phrasing, not observed demand.
overlay: 1.0.0
info:
title: API Evangelist conversational phrasing for Kit Custom Fields API
version: 1.0.0
extends: openapi/convertkit-custom-fields-api-openapi.yml
actions:
- target: $.info
update:
x-apievangelist-phrasing:
method: generated
generated: '2026-10-02'
generator: build-phrasing.py
label: Generated by API Evangelist
operations: 6
- target: $.paths['/v4/bulk/custom_fields'].post
update:
x-apievangelist-phrasing:
intent: Create many custom fields at once
effect: write
questions:
- Can I create a batch of new custom fields in one request?
- How do I get notified when a bulk custom field creation finishes?
instructions:
- text: 'Bulk create these custom fields: {custom_fields}.'
slots:
custom_fields: requestBody.custom_fields
- text: Create the custom fields {custom_fields} in bulk and post the result to {callback_url}.
slots:
custom_fields: requestBody.custom_fields
callback_url: requestBody.callback_url
method: generated
generated: '2026-10-02'
- target: $.paths['/v4/bulk/custom_fields/subscribers'].post
update:
x-apievangelist-phrasing:
intent: Set custom field values for many subscribers
effect: write
questions:
- How do I update custom field values for thousands of subscribers at once?
- Can I bulk-fill a field like last name across many subscribers asynchronously?
instructions:
- text: Bulk update subscriber custom field values {custom_field_values} and call {callback_url} when done.
slots:
custom_field_values: requestBody.custom_field_values
callback_url: requestBody.callback_url
- text: 'Apply these field values to many subscribers at once: {custom_field_values}, notifying {callback_url}.'
slots:
custom_field_values: requestBody.custom_field_values
callback_url: requestBody.callback_url
method: generated
generated: '2026-10-02'
- target: $.paths['/v4/custom_fields'].get
update:
x-apievangelist-phrasing:
intent: List custom fields
effect: read
questions:
- What custom fields have I defined for collecting subscriber data?
- Which field keys should I use when setting subscriber custom values?
instructions:
- text: List all custom fields on my account.
- text: Show my custom fields, {per_page} per page.
slots:
per_page: query.per_page
method: generated
generated: '2026-10-02'
- target: $.paths['/v4/custom_fields'].post
update:
x-apievangelist-phrasing:
intent: Create a custom field
effect: write
questions:
- How do I add a new custom field like Last Name to my subscriber records?
- Does a custom field label need to be unique on my account?
instructions:
- text: Create a custom field labeled {label}.
slots:
label: requestBody.label
- text: Add a new subscriber field called {label}.
slots:
label: requestBody.label
method: generated
generated: '2026-10-02'
- target: $.paths['/v4/custom_fields/{id}'].put
update:
x-apievangelist-phrasing:
intent: Rename a custom field's label
effect: write
questions:
- Can I rename an existing custom field without losing subscriber data?
- What happens to a field's key when I change its label?
instructions:
- text: Rename custom field {id} to {label}.
slots:
id: path.id
label: requestBody.label
- text: Change the label on existing custom field {id} to {label}.
slots:
id: path.id
label: requestBody.label
method: generated
generated: '2026-10-02'
- target: $.paths['/v4/custom_fields/{id}'].delete
update:
x-apievangelist-phrasing:
intent: Delete a custom field and its data
effect: destructive
questions:
- What happens to subscriber data when I delete a custom field?
- How do I remove a custom field I no longer use?
instructions:
- text: Delete custom field {id}.
slots:
id: path.id
- text: Remove custom field {id} and wipe its values from all subscribers.
slots:
id: path.id
method: generated
generated: '2026-10-02'
Work with this as data
Every overlay here is available over the APIs.io API and to AI agents over MCP.
MCP server
One button, every client — Claude, Cursor, VS Code and the rest.
https://apis.io/mcp
Tools for openapi overlays
4 MCP tools reach this
find_overlaysBrowse and filter every overlay in the catalog.apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.resolveTurn a domain, URL or GitHub org into the provider it belongs to.find_cohortsEvery scored population of providers in the catalog.
Call it yourself
curl for this page
This overlay
curl "https://apis.io/api/v1/overlays/convertkit-custom-fields-api-phrasing-overlay"
All openapi overlays
curl "https://apis.io/api/v1/overlays?limit=25"
Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.
Get an API key
Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.
A second provider on the same verified email joins the account you already have.