Fly.io Sprites

provider: "sprites"

Bills actual CPU and memory use; this is the full-use price; storage extra.

List price per hour

1 vCPU · 2 GB	$0.082
2 vCPU · 4 GB	$0.165
4 vCPU · 8 GB	$0.329
8 vCPU · 16 GB	max 8 GB memory
16 vCPU · 32 GB	max 8 vCPU
32 vCPU · 128 GB	max 8 vCPU

Source: fly.io, 2026-11-13 (an estimate, not a bill)
Billing: CPU only while busy; shown with every core busy
Plan: none needed

Adapter

Supports: Exec + streaming · Files
Max size: 8 vCPU · 8 GB
Routing: Chosen when it's the cheapest fit, or as a fallback
Docs: fly.io

Measured on real accounts

Real-account check: 13 / 13 steps; 2026-11-13
Cold start: 304 ms; median, 1 location
Succeeded: 100%; of benchmark sandboxes
Size you get: not measured; no cost run yet
Billed vs list price: not measured; no cost run yet

Help verify Fly.io Sprites

Have a Fly.io Sprites account? These run real sandboxes on it, for a few cents at most, and write result files that fill in the blanks above. Results never include your keys. Run them in a clone of the repo and open a pull request with the files: CI checks every file for keys and impossible numbers, and a maintainer reviews each one before it shows here.

terminal

npx @sandboxrouter/sdk cost run --provider sprites --minutes 10 --by YOUR_GITHUB_USERNAME

Real-account check, step by step

13 of 13 steps passed on a real account, 2026-11-13 (v0.7.0).

createpassed
exec: stdout, stderr, exit codepassed
exec: env and cwdpassed
exec: UTF-8 outputpassed
exec: streamingpassed
files: binary round-trippassed
files: 1 MB round-trippassed
files: missing file is an errorpassed
files: visible to commandspassed
exec: command timeoutpassed
exec: timed-out command was stoppedpassed
pause and resumen/a
killpassed
killed sandbox is gonepassed

setup

npm i @sandboxrouter/sdk @fly/sprites
export SPRITES_TOKEN=...

use Fly.io Sprites

import { Router } from "@sandboxrouter/sdk";

const router = new Router();
const sbx = await router.create({}, { provider: "sprites" });
await sbx.exec("uname -a", { onStdout: (c) => process.stdout.write(c) });
await sbx.kill();