Billing & Credits
SiliconRig uses a credit-based billing system. Sessions consume credits while they're running — whether you're actively using the board or not.
How credits work
- 1 credit is deducted when you start a session
- Credits continue to be consumed at a regular interval while the session is active or idle
- The board stays reserved until the session ends, so idle sessions still cost credits
- Every board type costs the same: one credit a minute
Free credits
New accounts start on the free tier with 60 credits, refilled to 60 at the start of every month. One credit is one minute on a board, so that is an hour a month: enough to start sessions, flash firmware and work over the serial console.
What the free tier limits:
- Sessions end after 10 minutes
- One session at a time
API keys are not limited: they work on every tier, and so do the CLI, the SDK and CI.
Buying credits
To add credits:
- Go to Billing in the dashboard
- Enter the number of credits you want
- Complete payment via Stripe
Your first purchase moves you to pay as you go for good, which lifts the ten minute session cap and raises concurrent sessions from one to four. The monthly refill follows you: it is not something a purchase gives up.
What happens when credits run out
If your balance hits zero during a session, the session ends automatically. The board is released and returned to the available pool. You'll get a notification in the web UI or via WebSocket if connected programmatically.
You can't start a new session with zero credits — the API returns 402 Payment Required.
Checking your balance
Web UI: Your credit balance is always visible in the dashboard.
API:
curl https://api.srig.io/v1/auth/me \
-H "Authorization: Bearer key_..."The response includes your current balance_credits.
Tiers
| Tier | Price | Credits | Max session length | Concurrent sessions |
|---|---|---|---|---|
| Free | 0 EUR | 60 a month | 10 minutes | 1 |
| Pay as you go | 0.10 EUR per credit | 60 a month, plus what you buy | Unlimited | 4 |
There is no subscription. Both tiers are refilled to 60 credits at the start of each month, and a balance you bought is never reduced by that. Buying credits once moves an account to pay as you go, which lifts the session length and concurrency limits.
API keys work on both.