curl --request DELETE \
--url https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain} \
--header 'Authorization: Bearer <token>'import requests
url = "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}"
headers = {"Authorization": "Bearer <token>"}
response = requests.delete(url, headers=headers)
print(response.text)const options = {method: 'DELETE', headers: {Authorization: 'Bearer <token>'}};
fetch('https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}', 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/{domain}",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "DELETE",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}"
req, _ := http.NewRequest("DELETE", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.delete("https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Delete.new(url)
request["Authorization"] = 'Bearer <token>'
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_limit_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": "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
}
}Remove a custom domain
Stops serving the hostname and releases its certificate. The published port keeps serving its own address, and the body echoes the registration that was removed.
Delete the DNS record afterwards. One left pointing at the target resolves to nothing Sail serves.
curl --request DELETE \
--url https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain} \
--header 'Authorization: Bearer <token>'import requests
url = "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}"
headers = {"Authorization": "Bearer <token>"}
response = requests.delete(url, headers=headers)
print(response.text)const options = {method: 'DELETE', headers: {Authorization: 'Bearer <token>'}};
fetch('https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}', 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/{domain}",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "DELETE",
CURLOPT_HTTPHEADER => [
"Authorization: Bearer <token>"
],
]);
$response = curl_exec($curl);
$err = curl_error($curl);
curl_close($curl);
if ($err) {
echo "cURL Error #:" . $err;
} else {
echo $response;
}package main
import (
"fmt"
"net/http"
"io"
)
func main() {
url := "https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}"
req, _ := http.NewRequest("DELETE", url, nil)
req.Header.Add("Authorization", "Bearer <token>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.delete("https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}")
.header("Authorization", "Bearer <token>")
.asString();require 'uri'
require 'net/http'
url = URI("https://sailbox-api.sailresearch.com/v1/sailboxes/{sailbox_id}/domains/{domain}")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Delete.new(url)
request["Authorization"] = 'Bearer <token>'
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_limit_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": "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
}
}Authorizations
Bearer authentication header of the form Bearer <token>, where <token> is your auth token.
Path Parameters
Id of the Sailbox, as returned by create. It is sb_ followed by a UUID.
The hostname to remove. Case, a trailing dot, and Unicode or xn-- spelling all match the same registration.
253Response
The hostname no longer serves the Sailbox.
A hostname you own, serving one published http port.
The hostname, lowercased. A name with non-ASCII characters comes back in its ASCII form.
"app.example.com"
Sailbox the hostname serves.
Port inside the Sailbox that traffic to this hostname reaches.
1 <= x <= 65535The hostname's HTTPS address.
"https://app.example.com"
Hostname to point your DNS at with a CNAME record. It is the same for every domain in your organization, so you can read it once and reuse it.
When the hostname was registered.