Send out a batch

POST/v1/batches/{id}/finalize

Portal verb "Send out". Moves draft → sending (on_finalize mode). Empty batches are rejected (400 batch_empty_finalize); already-finalized batches return 409 batch_finalized.

Path parameters

idstringrequired

The batch's ID, starting bat_.

Returns

200 application/json. Batch now sending. See the Batch object.

Errors have one shape; see Errors for every code.

Code language

Request

curl -X POST "https://api.parasend.com/v1/batches/bat_01M6R27T8SXWNM911FS53W4S9F/finalize" \
  -H "Authorization: Bearer $PARASEND_KEY" \
  -H "Idempotency-Key: $(uuidgen)"

const res = await fetch('https://api.parasend.com/v1/batches/bat_01M6R27T8SXWNM911FS53W4S9F/finalize', {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.PARASEND_KEY}`,
    'Idempotency-Key': crypto.randomUUID(),
  },
});
const data = await res.json();

import os, requests, uuid

res = requests.post(
    "https://api.parasend.com/v1/batches/bat_01M6R27T8SXWNM911FS53W4S9F/finalize",
    headers={
        "Authorization": f"Bearer {os.environ['PARASEND_KEY']}",
        "Idempotency-Key": str(uuid.uuid4()),
    },
)
data = res.json()

using var http = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://api.parasend.com/v1/batches/bat_01M6R27T8SXWNM911FS53W4S9F/finalize");
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", Environment.GetEnvironmentVariable("PARASEND_KEY"));
request.Headers.Add("Idempotency-Key", Guid.NewGuid().ToString());
var response = await http.SendAsync(request);
var body = await response.Content.ReadAsStringAsync();

var request = HttpRequest.newBuilder(URI.create("https://api.parasend.com/v1/batches/bat_01M6R27T8SXWNM911FS53W4S9F/finalize"))
    .header("Authorization", "Bearer " + System.getenv("PARASEND_KEY"))
    .header("Idempotency-Key", UUID.randomUUID().toString())
    .method("POST", HttpRequest.BodyPublishers.noBody())
    .build();
var response = HttpClient.newHttpClient().send(request, HttpResponse.BodyHandlers.ofString());

$client = new GuzzleHttp\Client();
$response = $client->request('POST', 'https://api.parasend.com/v1/batches/bat_01M6R27T8SXWNM911FS53W4S9F/finalize', [
    'headers' => [
        'Authorization' => 'Bearer ' . getenv('PARASEND_KEY'),
        'Idempotency-Key' => bin2hex(random_bytes(16)),
    ],
]);
$data = json_decode($response->getBody(), true);

Response · 200

{
  "id": "bat_01M6R27T8SXWNM911FS53W4S9F",
  "object": "batch",
  "name": "November notices, first run",
  "status": "sending",
  "sending_mode": "on_finalize",
  "follow_up_policy_id": null,
  "allow_policy_override": true,
  "follow_ups_paused": false,
  "scheduled_at": null,
  "send_window": {
    "tz": "Atlantic/Reykjavik",
    "end": "21:00",
    "start": "09:00"
  },
  "defaults": {},
  "files": [],
  "accepting_deliveries": false,
  "counts": {
    "total": 2,
    "delivered": 0,
    "ended": 0,
    "in_progress": 2
  },
  "created_by": {
    "user_id": "usr_01M6R27SYD4B50414S0BZ4KBKR",
    "via": "api_key"
  },
  "livemode": false,
  "created": "2026-11-06T09:15:05.881Z",
  "sent_out_at": "2026-11-06T09:15:05.922Z",
  "following_up_at": null,
  "completed_at": null,
  "cancelled_at": null
}