curl -X PATCH 'https://api.resend.com/topics/id' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '{
  "name": "string",
  "description": "string",
  "visibility": "public"
}'

# PATCH /topics/{id} (Resend API)
Base URL: https://api.resend.com
Auth: Authorization: Bearer <RESEND_API_KEY>
Last verified: 2026-09-03

> Update an existing topic

## Critical Gotchas
* All requests must include a `User-Agent` header (e.g. `User-Agent: my-app/1.0`) or the API returns HTTP 403.
* The `to` field is an array of strings, even when sending to a single recipient.

## cURL
curl -X PATCH 'https://api.resend.com/topics/id' \
  -H "Authorization: Bearer $RESEND_API_KEY" \
  -H 'User-Agent: my-app/1.0' \
  -H 'Content-Type: application/json' \
  -d '{"name":"string","description":"string","visibility":"public"}'

## Parameters
| Name | In | Type | Required | Description |
| :--- | :--- | :--- | :--- | :--- |
| id | path | string | Yes | The Topic ID. |
| name | body | string | No | The name of the topic. Max 50 characters. |
| description | body | string | No | A description of the topic. Max 200 characters. |
| visibility | body | string | No | The visibility of the topic. |

## Response (200 OK)
{"id":"78261eea-8f8b-4381-83c6-79fa7120f1cf","object":"topic"}

---
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PATCH

/topics/{id}

Resend API

Update an existing topic

Base URL: https://api.resend.com
Auth: Authorization: Bearer <RESEND_API_KEY>
Last verified: 2026-09-03 · upstream hash matched

Actions

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→ 234 tokens · Vary: Accept

Critical gotchas

All requests must include a User-Agent header (e.g. User-Agent: my-app/1.0) or the API returns HTTP 403.

The to field is an array of strings, even when sending to a single recipient.

cURL

curl -X PATCH 'https://api.resend.com/topics/id' \  -H "Authorization: Bearer $RESEND_API_KEY" \  -H 'User-Agent: my-app/1.0' \  -H 'Content-Type: application/json' \  -d '{  "name": "string",  "description": "string",  "visibility": "public"}'

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Parameters

Name	In	Type	Required	Description
id	path	string	Yes	The Topic ID.
name	body	string	No	The name of the topic. Max 50 characters.
description	body	string	No	A description of the topic. Max 200 characters.
visibility	body	string	No	The visibility of the topic.

Response 200 OK

{
  "id": "78261eea-8f8b-4381-83c6-79fa7120f1cf",
  "object": "topic"
}