curl --request POST \
--url https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"target": "d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6",
"port": 8080
}
'import requests
url = "https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets"
payload = {
"target": "d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6",
"port": 8080
}
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({target: 'd0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6', port: 8080})
};
fetch('https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets', 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://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets",
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([
'target' => 'd0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6',
'port' => 8080
]),
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://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets"
payload := strings.NewReader("{\n \"target\": \"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6\",\n \"port\": 8080\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://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"target\": \"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6\",\n \"port\": 8080\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets")
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 \"target\": \"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6\",\n \"port\": 8080\n}"
response = http.request(request)
puts response.read_body{
"target": {
"id": "c9d0e1f2-a3b4-4567-c8d9-e0f1a2b3c4d5",
"instance": {
"id": "d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6",
"crn": "crn:compute:sa-saopaulo-1:my-account:instance/web-01",
"name": "web-01"
},
"health": "healthy",
"created_at": "2026-01-15T09:30:00Z",
"updated_at": "2026-01-15T09:30:00Z",
"address": "10.0.0.42",
"port": 8080,
"last_seen_at": "2026-01-15T09:31:00Z"
}
}{
"error": {
"code": "INVALID_INPUT",
"message": "Invalid request parameters",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "UNAUTHORIZED",
"message": "Authentication required",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "ACCESS_DENIED",
"message": "You don't have permission to perform this action",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "NOT_FOUND",
"message": "Resource not found",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "CONFLICT",
"message": "Resource with this name already exists",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "IDEMPOTENCY_KEY_REUSED",
"message": "This Idempotency-Key was already used with a different request payload",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "INTERNAL_ERROR",
"message": "An internal error occurred",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}Attach a target to this group
target must match the group’s target_type: an IP address
for ip, a compute instance UUID, CRN or name for instance. A function
group takes no targets yet, and a pool-mode group takes its
backends from the instance pool — attaching to either is an
error rather than a row nothing will ever route to.
curl --request POST \
--url https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data '
{
"target": "d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6",
"port": 8080
}
'import requests
url = "https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets"
payload = {
"target": "d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6",
"port": 8080
}
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({target: 'd0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6', port: 8080})
};
fetch('https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets', 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://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets",
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([
'target' => 'd0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6',
'port' => 8080
]),
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://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets"
payload := strings.NewReader("{\n \"target\": \"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6\",\n \"port\": 8080\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://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets")
.header("Authorization", "Bearer <token>")
.header("Content-Type", "application/json")
.body("{\n \"target\": \"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6\",\n \"port\": 8080\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://loadbalancer.{region}.basaltic.sh/v1/target-groups/{id}/targets")
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 \"target\": \"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6\",\n \"port\": 8080\n}"
response = http.request(request)
puts response.read_body{
"target": {
"id": "c9d0e1f2-a3b4-4567-c8d9-e0f1a2b3c4d5",
"instance": {
"id": "d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6",
"crn": "crn:compute:sa-saopaulo-1:my-account:instance/web-01",
"name": "web-01"
},
"health": "healthy",
"created_at": "2026-01-15T09:30:00Z",
"updated_at": "2026-01-15T09:30:00Z",
"address": "10.0.0.42",
"port": 8080,
"last_seen_at": "2026-01-15T09:31:00Z"
}
}{
"error": {
"code": "INVALID_INPUT",
"message": "Invalid request parameters",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "UNAUTHORIZED",
"message": "Authentication required",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "ACCESS_DENIED",
"message": "You don't have permission to perform this action",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "NOT_FOUND",
"message": "Resource not found",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "CONFLICT",
"message": "Resource with this name already exists",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "IDEMPOTENCY_KEY_REUSED",
"message": "This Idempotency-Key was already used with a different request payload",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}{
"error": {
"code": "INTERNAL_ERROR",
"message": "An internal error occurred",
"request_id": "550e8400-e29b-41d4-a716-446655440000"
}
}loadbalancer:AttachTarget. See LOADBALANCER permissions for the full list, what each one covers, and an example policy.Authorizations
An OAuth 2.0 bearer token, sent as Authorization: Bearer <token>.
This is the recommended way to authenticate.
Get one by exchanging a service account's access key pair at
POST /v1/oauth/token with grant_type=client_credentials. It is the
standard client-credentials grant, so any OAuth-aware library will
obtain and refresh it for you.
curl -s -u "$KEY_ID:$SECRET" -d grant_type=client_credentials \
https://iam.basaltic.sh/v1/oauth/token
Tokens last an hour by default. The same access key pair is separately your AWS SigV4 credential for the S3-compatible object endpoint, which speaks nothing else.
Headers
Optional client-generated key that makes a create replay-safe. Retrying a request with the same key returns the original outcome verbatim instead of creating a duplicate resource. Reusing a key with a different request body is rejected (422); a request whose key is still being processed returns 409. Records are honored for 24 hours. Use a UUID or similarly unique token.
255Path Parameters
UUID, CRN or exact account-scoped name
"b8c9d0e1-f2a3-4456-b7c8-d9e0f1a2b3c4"
Body
target is a literal IP for IP groups or an instance UUID, CRN or exact account-scoped name for instance groups.
Must match the group's target_type: an IP address for ip,
a compute instance UUID, CRN or exact account-scoped name for instance. An ip ref has to be
a routable unicast address — loopback, link-local (including
the 169.254.169.254 metadata endpoint), multicast, and
unspecified addresses are rejected.
"d0e1f2a3-b4c5-4678-d9e0-f1a2b3c4d5e6"
Per-target backend port override. When omitted, the target inherits the target group port. Pool-derived targets always inherit the group port.
1 <= x <= 655358080
Response
Created
A registered backend. Exactly one of instance or address is returned.
- Option 1
- Option 2
Show child attributes
Show child attributes

