Scale Sandbox

curl --request POST \
  --url https://app.opencomputer.dev/api/sandboxes/{id}/scale \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "memoryMB": 123,
  "diskMB": 123
}
'

import requests

url = "https://app.opencomputer.dev/api/sandboxes/{id}/scale"

payload = {
    "memoryMB": 123,
    "diskMB": 123
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({memoryMB: 123, diskMB: 123})
};

fetch('https://app.opencomputer.dev/api/sandboxes/{id}/scale', 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://app.opencomputer.dev/api/sandboxes/{id}/scale",
  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([
    'memoryMB' => 123,
    'diskMB' => 123
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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://app.opencomputer.dev/api/sandboxes/{id}/scale"

	payload := strings.NewReader("{\n  \"memoryMB\": 123,\n  \"diskMB\": 123\n}")

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

	req.Header.Add("X-API-Key", "<api-key>")
	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://app.opencomputer.dev/api/sandboxes/{id}/scale")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"memoryMB\": 123,\n  \"diskMB\": 123\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.opencomputer.dev/api/sandboxes/{id}/scale")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"memoryMB\": 123,\n  \"diskMB\": 123\n}"

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

{
  "sandboxID": "sb-abc123",
  "workerID": "w-use2-abc123",
  "memoryMB": 8192,
  "cpuPercent": 200,
  "diskMB": 40960,
  "migrated": false,
  "ok": true,
  "autoscaleDisabled": false
}

POST

api

sandboxes

{id}

scale

Scale Sandbox

curl --request POST \
  --url https://app.opencomputer.dev/api/sandboxes/{id}/scale \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "memoryMB": 123,
  "diskMB": 123
}
'

import requests

url = "https://app.opencomputer.dev/api/sandboxes/{id}/scale"

payload = {
    "memoryMB": 123,
    "diskMB": 123
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({memoryMB: 123, diskMB: 123})
};

fetch('https://app.opencomputer.dev/api/sandboxes/{id}/scale', 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://app.opencomputer.dev/api/sandboxes/{id}/scale",
  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([
    'memoryMB' => 123,
    'diskMB' => 123
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "X-API-Key: <api-key>"
  ],
]);

$response = curl_exec($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://app.opencomputer.dev/api/sandboxes/{id}/scale"

	payload := strings.NewReader("{\n  \"memoryMB\": 123,\n  \"diskMB\": 123\n}")

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

	req.Header.Add("X-API-Key", "<api-key>")
	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://app.opencomputer.dev/api/sandboxes/{id}/scale")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"memoryMB\": 123,\n  \"diskMB\": 123\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://app.opencomputer.dev/api/sandboxes/{id}/scale")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"memoryMB\": 123,\n  \"diskMB\": 123\n}"

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

{
  "sandboxID": "sb-abc123",
  "workerID": "w-use2-abc123",
  "memoryMB": 8192,
  "cpuPercent": 200,
  "diskMB": 40960,
  "migrated": false,
  "ok": true,
  "autoscaleDisabled": false
}

Manually resize a running sandbox. Any subset of memoryMB and diskMB may be supplied; unspecified dimensions are left alone. Combining them applies both changes atomically and records a single billing event. For sandbox-driven or platform-driven resize, see the Elasticity guide.

string

required

Sandbox ID

integer

Target memory in MB. Must be an allowed tier: 1024, 4096, 8192, 16384, 32768, or 65536. CPU scales proportionally (1 vCPU per ~4 GB up to 16 GB / 4 vCPU). Memory grow above the VM’s initial ceiling is served by virtio-mem hotplug; shrink below the guest’s working set is refused with oom_floor.

integer

Target workspace disk size in MB. Range 20480–262144 (20 GB–256 GB). Grow is applied online (QMP block_resize + resize2fs) and completes in ~1–2 seconds without pausing the guest. The new size persists across hibernate, wake, fork, and migration. Shrink is refused when the guest filesystem’s used bytes leave less than a 500 MB safety margin below the target (shrink_refused).

At least one of memoryMB or diskMB must be provided.

Side effects

A manual memory scale disables the per-sandbox autoscaler (explicit user intent overrides the loop). A disk-only scale leaves the autoscaler alone — autoscale doesn’t drive disk. Re-enable memory autoscale via PUT /api/sandboxes/{id}/autoscale if you want size to track load again.

Response

{
  "sandboxID": "sb-abc123",
  "workerID": "w-use2-abc123",
  "memoryMB": 8192,
  "cpuPercent": 200,
  "diskMB": 40960,
  "migrated": false,
  "ok": true,
  "autoscaleDisabled": false
}

Fields present in the response reflect the dimensions that were changed. A disk-only scale returns memoryMB: 0 and cpuPercent: 0 (no memory change) plus diskMB set to the applied value. migrated: true indicates the sandbox was moved to a larger worker to satisfy a memory grow request that the current worker couldn’t fit.

Errors

400 Bad Request — no dimension supplied, diskMB below the 20 GB floor / above the 256 GB cap, or memoryMB not in the allowed tier table.
402 Payment Required — requested size exceeds the org’s plan cap (free tier is capped at 4 GB memory / 20 GB disk).
403 Forbidden scaling_locked — the sandbox has a scaling lock active. Unlock via PUT /api/sandboxes/{id}/scaling-lock first.
403 Forbidden — diskMB exceeds the org’s MaxDiskMB cap.
409 Conflict oom_floor — memory shrink would force a guest OOM-kill (current working set exceeds the requested size). Free memory inside the guest, then retry.
409 Conflict sandbox_hibernated — sandbox is hibernated. Call POST /api/sandboxes/{id}/wake first, then retry.
shrink_refused (500 with structured code) — a disk shrink would leave less than 500 MB above the guest’s used bytes. Free space inside the guest first.

Billing

Every accepted scale records a sandbox_scale_events row with the resulting memory_mb, cpu_percent, and disk_mb. Usage aggregation groups by all three dimensions, so a mixed sequence of resizes over a billing period is attributed against the correct envelope for each slice. Disk over the 20 GB included allowance is billed at $0.0000001 per GB-second (≈$ 0.26 per GB-month) for the lifetime of the sandbox — running or hibernated.

⌘I

Getting Started

Sandboxes

Browser Sessions

Durable Agent Sessions

Reserved Capacity

CLI

Guides

TypeScript SDK

Python SDK

CLI Reference

API Reference

Resources

Scale Sandbox

Side effects

Response

Errors

Billing

​Side effects

​Response

​Errors

​Billing

Side effects

Response

Errors

Billing