> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sendflit.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Switching from Resend

> Move an existing Resend integration to SendFlit by changing the API key and base URL.

SendFlit has a Resend-compatible API at `https://api.sendflit.com/resend`. Requests and responses use Resend's shapes, including its error format, so moving usually means changing the key and the base URL.

## Steps

1. **Verify your domain** in SendFlit. See the [Quickstart](/quickstart#1-add-your-sending-domain).
2. **Create a SendFlit API key** with the `sending` scope.
3. **Change the base URL and key:**

| Before (Resend) | After (SendFlit) |
| - | - |
| `https://api.resend.com` | `https://api.sendflit.com/resend` |
| `re_...` (Resend key) | `re_...` (SendFlit key) |

With the Resend Node SDK, set the `RESEND_BASE_URL` environment variable to `https://api.sendflit.com/resend` and use your SendFlit key. With other SDKs or plain HTTP, point the client at the same base URL.

4. **Send a test email** and check its status.

## What's supported

* Sending: single emails, batch sends, scheduled sends, and cancelling and rescheduling.
* Reading emails back.
* Domains: create, list, get, and verify.

## What isn't supported yet

* More than one address in `to`. Use `cc` and `bcc`, or send one email per recipient with the batch endpoint.
* Attachments by URL.
* Natural-language scheduling, such as "in 1 hour". Use an ISO 8601 timestamp.
* Audiences, contacts, broadcasts, and API key endpoints.

Unsupported endpoints return a clear `validation_error` or `404` instead of partially working.

## Webhooks

Create the webhook endpoint in SendFlit with the Resend-compatible format. The payload and the Svix-style signature headers then match Resend's, so the verification code you already have keeps working. See [Webhooks](/reference/webhooks).


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