Tag a contact

Tag a contact

POST /api/v1/contacts/{contactId}/tags Attaches a tag to a contact by name. The tag is created in the organization if it does not exist yet, exactly like the tags sent when upserting a contact. Idempotent: attaching the same tag twice does not duplicate anything and answers 200.

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

Example

bash

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

Response

200 OK — the call succeeded.
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.
404 Not Found — no such resource, or it belongs to another organization. The API never confirms that an id exists to a caller who has no right to it.
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 contact
`data.email`	string	Its address — unique inside its list
`data.firstName`	string	null
`data.lastName`	string	null
`data.status`	string	`pending`, `subscribed`, `unsubscribed`, `bounced`, `complained`
`data.listId`	string	The list it belongs to
`data.list`	object	`{id, name}` of that list
`data.tags`	array	`{id, name}` of every tag carried
`data.createdAt`	string	ISO creation date
`data.updatedAt`	string	ISO date of the last change

Example response

json

{
  "success": true,
  "data": {
    "id": "4d19c0a2",
    "email": "ada@example.com",
    "firstName": "Ada",
    "lastName": "Lovelace",
    "status": "subscribed",
    "listId": "0b7c51e8",
    "list": {
      "id": "0b7c51e8",
      "name": "Newsletter"
    },
    "tags": [
      {
        "id": "7c2ef4b1",
        "name": "vip"
      }
    ],
    "createdAt": "2026-08-23T10:22:05.000Z",
    "updatedAt": "2026-08-23T10:22:05.000Z"
  }
}