Pricing

Note KUMODeck is in early access. This page describes how billing works in the server today; exact unit prices are published before general availability.

KUMODeck does not make money on your app or game. There is no free tier: you pay KUMODeck's usage fee for the parts you use, set at cost, and nothing more. KUMODeck itself pays for none of it.

What you can count on#

• No caps, nothing to outgrow. There is no free-tier limit that switches your app off the day it goes viral on X. A game with 100,000 plays in a month keeps running and costs a few dollars (see the examples below).
• Nothing runs on money you did not put in. Usage comes out of your prepaid balance, so a bill can never run away from you. You get a low-balance email first; if the balance still reaches $0, what is billed pauses until you top up and then resumes on its own (see Prepaid balance). Automatic top-up keeps a busy app from ever pausing.
• Prices we have no way to raise. The usage fee is what running the parts you use actually costs KUMODeck, with nothing added, so there is no margin to raise. If those costs change, the fee follows them — and nothing else changes.

While KUMODeck is young#

KUMODeck's fixed monthly costs (for example a $5-a-month base plan for running the API) are shared between the creators who use them. Right after launch, while only a few creators share them, your part of these base fees can look large next to what you actually used. In real money it is a few cents to a few dollars a month, and it gets smaller as more creators join.

Compared with other options#

Facts from each service's public pricing pages, checked on 2026-09-27 (sources at the end of this page). Every option here is a reasonable choice; they do different jobs, so compare what you actually need.

Backend services

Two typical creators#

These are estimates, worked out from the providers' public prices (checked 2026-09-27) and the assumptions listed. Your game will differ; GET /v1/money/usage shows your real numbers.

1. A free game goes viral on X: 100,000 plays in a month

Assumptions: every play is a new player signed in as a guest; one play loads 20 files (1 MB in total) and makes 10 API calls (guest sign-in and saves) at about 2 ms of CPU each; 2 KB of data per player.

2. Multiplayer: 200 players online at peak

Assumptions: 200 players at peak and 50 on average over the month; rooms of 4; each player sends 20 messages a second (an action game), and every message reaches the other 3 players in the room.

Tip Use the latest SDK. Current SDKs connect each room straight to its server and take the cheap path automatically. An old SDK that does not announce this ability sends room traffic through the first connection instead, which costs roughly 10 times as much per match — in the example above, up to about $1,830 a month instead of $71. Updating the SDK is all it takes.

Only what you use#

Every building block is optional, and only the blocks you use are metered. Host your app elsewhere and there is no hosting cost; never turn on Functions and they cost nothing. Parts that cost money per use or change what your users see — sharing tools, sign-in providers, Functions — are off until you turn them on. GET /v1/money/usage (or usage_get from your AI agent) breaks the month down by component.

Some examples of the usage fee:

Prepaid balance#

Usage is taken from a prepaid balance, like the API credits of an AI provider. Top it up with kumodeck billing topup or from the dashboard (Stripe Checkout, $5–$10,000; you pay on Stripe's page yourself) . Because there is no free tier, a new account starts with a first deposit — the $5 minimum is enough to try everything; the card fee (about 45¢ on $5) is Stripe's actual fee, taken from the deposit.

• Invite code: if you were given one, use it with kumodeck signup --invite <code> when you sign up, or kumodeck billing redeem <code> (or the dashboard) afterwards. It adds $5 of invite credit (usage fees only; it cannot be refunded or withdrawn) once your email address is confirmed. kumodeck billing shows how much of your balance is invite credit. One code per account.

• Low-balance notice: when your balance drops below a line you choose (default $5), you get an email and an MCP notice with an estimate of how many days it will last.
• Automatic top-up (off by default): save a card at checkout and choose a threshold and an amount ($5–$1,000).
• When the balance reaches $0 and nothing else covers it (an automatic top-up that has not failed), everything that is billed pauses: your projects' API for your users, hosting, multiplayer and Functions. Your users see a neutral message — never the KUMODeck name. New projects and new deployments are refused with 402 (the CLI prints kumodeck billing topup; kumodeck billing says whether you are paused). Your dashboard, kumodeck config push, reading your data and topping up keep working, and everything resumes automatically as soon as the balance is above $0 again (or an automatic top-up covers it).
• If usage goes a little past $0 before the pause takes effect, the difference is owed and is covered first by your next top-up.

Closing your account#

You can close your developer account yourself: on the dashboard under Account (click your email address at the top), or by typing kumodeck account close in your own terminal. Read these three points first — both places show them again before you confirm:

1. It cannot be reopened. There is no way back, not even through support. To use KUMODeck again you create a new account (the same email address can be used again only after the old account has been erased).
2. Your prepaid balance is returned after the month's usage is finalized (by around the 3rd of the next month): the part you added by card is refunded to that card (a partial refund of the original payment). Invite credit is not returned. Automatic top-ups stop.
3. Your account's records stay until everything is settled. You can still sign in and see them.

Before closing, delete your projects: KUMODeck does not delete running projects for you (the close is refused until none are left; the dashboard's Account page lists them with a delete button).

Once KUMODeck holds no money for you and every refund is done, your email address, password and name are erased. Accounting records are kept as the law requires.

AI tools cannot close an account: there is no MCP tool for it, the API refuses MCP connections, and kumodeck account close only runs when you type it in an interactive terminal (--yes, pipes and CI are refused). Your AI assistant will point you to the dashboard or the command instead.

Sources#

All checked on 2026-09-27. Prices change; the providers' own pages are authoritative.

• Payments: Stripe pricing,
• Infrastructure: Cloudflare Durable Objects pricing
• Backends: Firebase, Supabase, Azure PlayFab, Convex, Photon, Colyseus, Heroic Labs, PartyKit joins Cloudflare