Marketplace

C3 aggregates GPU capacity from multiple data centers. When you submit a job, we find available compute at competitive rates—no need to manage cloud accounts or hunt for capacity yourself.

Available GPUs

GPU	VRAM	Best for
L40	48GB	Recommended for new jobs, training, inference, general-purpose GPU workloads
H100 80GB	80GB	Temporarily unavailable for non-admin job submissions
A100 80GB	80GB	Temporarily unavailable for non-admin job submissions
RTX A4000	16GB	Light training, testing, development

Set gpu: l40 in your .c3 config for new jobs. Run c3 list to see current pricing and availability.

Pricing

Compute

You're billed per second of actual compute time—not for time spent queuing or provisioning. New accounts receive £10 in free credits. Check your balance:

c3 balance

Plans

Plans are about iteration speed, not storage. The warm pool plus smart caching turns 5-45 minute cold starts into ~20-second job starts. Every new account starts with a 14-day Pro trial — warm-pool access, smart caching, 100 GB of storage, and £10 in compute credits.

Plan	Price	Warm pool	Smart caching	Concurrent jobs	Walltime	Storage
Free	£0/month	— (cold pool only)	—	1	6 h cap	10 GB
Pro	£25/month	L40 (~20s start)	yes	5	24 h	100 GB
Max	£45/month	L40 (~20s start)	yes	20	unlimited	1 TB

Manage your plan anytime:

c3 upgrade              # Interactive picker
c3 upgrade pro          # Subscribe to or switch to Pro
c3 upgrade max          # Subscribe to or switch to Max
c3 upgrade free         # Cancel subscription (takes effect at period end)
c3 upgrade free --yes   # Non-interactive cancel (for scripts)
c3 upgrade free -y      # Short form of --yes

Upgrades (e.g. Pro → Max) are immediate: you get the new features right away and your card is charged the prorated difference for the remainder of the current billing period. Downgrades (e.g. Max → Pro) and cancellations take effect at the end of your current billing period — you keep the features you paid for until then. To reverse a pending downgrade or cancellation before it takes effect, run c3 upgrade <current-tier>.

When your trial ends, you're moved to the Free plan. Existing data is preserved — you just can't upload more until you upgrade or free up space.

How jobs run

1. PENDING — Job submitted, waiting for a GPU
2. SCHEDULING — Assigning to a machine
3. RUNNING — Your script is executing
4. COMPLETED — Done. Download results with c3 pull
5. SYNCED — Results downloaded locally

Failed or cancelled jobs show as FAILED, CANCELED, or TIMED_OUT.

Warm pool

C3 maintains a pool of pre-provisioned GPUs. Jobs hitting the warm pool start running in ~20 seconds instead of waiting 5-45 minutes for cold provisioning.

Path	Allocation	Total Startup
Warm pool	seconds	~20 seconds
Cold provision	5-45 minutes	5-45 minutes

This enables rapid iteration: edit locally, submit, see results quickly, repeat.

Learn more about the warm pool →

Providers

Jobs currently run on Hyperstack. We're onboarding additional providers to increase capacity and reduce prices.