curl --request POST \
  --url https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "domain": "app.example.com",
  "guest_port": 8000
}
'

import requests

url = "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains"

payload = {
    "domain": "app.example.com",
    "guest_port": 8000
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({domain: 'app.example.com', guest_port: 8000})
};

fetch('https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'domain' => 'app.example.com',
    'guest_port' => 8000
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains"

	payload := strings.NewReader("{\n  \"domain\": \"app.example.com\",\n  \"guest_port\": 8000\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"domain\": \"app.example.com\",\n  \"guest_port\": 8000\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"domain\": \"app.example.com\",\n  \"guest_port\": 8000\n}"

response = http.request(request)
puts response.read_body

{
  "domain": "app.example.com",
  "sailbox_id": "sb_9c8f1e2a-3b4d-4f5a-8c7e-1d2f3a4b5c6d",
  "guest_port": 8000,
  "url": "https://app.example.com",
  "cname_target": "1a2b3c4d5e6f7890.sailboxes.sailresearch.com",
  "created_at": "2026-07-30T12:00:00Z"
}

{
  "error": {
    "message": "memory_gib for size m must be between 8 and 128",
    "type": "invalid_request_error",
    "param": null,
    "code": null
  }
}

{
  "error": {
    "message": "Invalid API key",
    "type": "authentication_error",
    "param": null,
    "code": "invalid_api_key"
  }
}

{
  "error": {
    "message": "Your API key has been disabled due to insufficient credits. Visit https://app.sailresearch.com/billing to add credits.",
    "type": "billing_error",
    "param": null,
    "code": "credits_exhausted",
    "billing_url": "https://app.sailresearch.com/billing"
  }
}

{
  "error": {
    "message": "sailboxes require an organization-scoped API key",
    "type": "permission_error",
    "param": null,
    "code": null
  }
}

{
  "error": {
    "message": "sailbox \"sb_9c8f1e2a-3b4d-4f5a-8c7e-1d2f3a4b5c6d\" not found",
    "type": "not_found_error",
    "param": null,
    "code": null
  }
}

{
  "error": {
    "message": "this domain is already registered",
    "type": "conflict_error",
    "param": null,
    "code": null
  }
}

{
  "error": {
    "message": "request body too large",
    "type": "invalid_request_error",
    "param": null,
    "code": null
  }
}

{
  "error": {
    "message": "Too many concurrent requests. Please retry after some of your organization's in-flight requests complete.",
    "type": "rate_limit_error",
    "param": null,
    "code": "rate_limited"
  }
}

{
  "error": {
    "message": "failed to fetch sailbox",
    "type": "server_error",
    "param": null,
    "code": null
  }
}

{
  "error": {
    "message": "Authentication service unavailable",
    "type": "server_error",
    "param": null,
    "code": null
  }
}