Create a topic

Create a topic

POST /api/v1/topics Creates a topic. Answers 201 with the created topic — its id is the topicId you attach to a campaign or a sequence. A name already taken — case-insensitive, so Freelancing collides with freelancing — answers 409.

Authorization

Role in the organization	This endpoint
`OWNER`	Allowed
`ADMIN`	Allowed
`MEMBER`	Refused — `403`

A key carries the role its creator holds in this organization — never a role on AgentsMail itself. See API keys.

Request body

Field	Type	Required	Description
`name`	string	yes	1 to 50 characters

json

{"name": "freelancing"}

Example

bash

curl -X POST -H "x-api-key: $AGENTMAIL_API_KEY" -H "content-type: application/json" \
  -d '{"name":"freelancing"}' \
  "https://www.agentsmail.io/api/v1/topics"

Response

201 Created — the created topic.
400 Bad Request — the name is missing, empty or over 50 characters; details carries the field-level issues.
401 Unauthorized — missing or invalid key, or its owner left the organization.
403 Forbidden — the key's owner is a member of the organization, not an admin.
409 Conflict — another topic already carries that name, case ignored. Nothing was created; list the topics and reuse the existing id.
429 Too Many Requests — over 120 requests in a minute for this key.

Response fields

Field	Type	Description
`success`	boolean	Indicates if the operation was successful
`data.id`	string	Unique identifier for the topic
`data.name`	string	Name of the topic, unique in the organization
`data.createdAt`	string	ISO creation date
`data.updatedAt`	string	ISO date of the last change

Example response

json

{
  "success": true,
  "data": {
    "id": "7c2e4b19",
    "name": "freelancing",
    "createdAt": "2026-08-23T10:22:05.000Z",
    "updatedAt": "2026-08-23T10:22:05.000Z"
  }
}

Agent recipe

Reuse before creating — a second call for a name already taken just costs you a 409:

const existing = await list('/api/v1/topics')
const topic =
  existing.data.find((t) => t.name.toLowerCase() === 'freelancing') ??
  (await post('/api/v1/topics', {name: 'freelancing'})).data

await post('/api/v1/campaigns', {
  name: 'Freelance news',
  subject: 'This month for freelancers',
  templateId,
  listId,
  topicId: topic.id,
})

Notes

Creating a topic changes nothing on its own. It starts mattering the day a campaign or a sequence carries it.