/contacts/v1/lists/:list_id/add seems broken

[raphink]

Hello,

I've been using /contacts/v1/lists/:list_id/add (https://developers.hubspot.com/docs/reference/api/crm/lists/v1-contacts#add-existing-contacts-to-a-l...) for years without a problem, passing emails as contact identifiers.

Today, I noticed I was getting 404 responses for lists that exist.

Is there an issue with this API endpoint at the moment?

[Jaycee_Lewis]

Hey, @raphink I don't see anything on the status page. I see these v1 List endpoints are set for depreciation in a few months (May 30th, 2025) but nothing about them not working before that. Can you share an example request and response? I'd like to try to reproduce in Postman.

Best,

Jaycee

[raphink]

Thanks for the reply.

My code looks like this:

func (c *Client) AddContactToList(email string, listId string) error {
	url := fmt.Sprintf("https://api.hubapi.com/contacts/v1/lists/%s/add", listId)
	params := map[string]interface{}{
		"emails": []string{
			email,
		},
	}
	reqBody, err := json.Marshal(params)
	if err != nil {
		return fmt.Errorf("Failed to marshal filter: %v", err)
	}

	req, err := http.NewRequest("POST", url, bytes.NewBuffer(reqBody))
	if err != nil {
		return err
	}

	req.Header.Set("Content-Type", "application/json")

	resp, err := c.HTTPClient.Do(req)
	if err != nil {
		return err
	}

	defer resp.Body.Close()

	// Check the response status code
	if resp.StatusCode != http.StatusAccepted && resp.StatusCode != http.StatusOK {
		return fmt.Errorf("API request failed with status code: %d", resp.StatusCode)
	}

	return nil
}

It has worked great for months, but now is returning with a 404, using lists that actually exist.

If this API is going to be deprecated, what is the replacement for it?