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Live demo · click the chip or press K
A simulation in your browser. Pull the plug and watch the run move.
When a GPU dies, your run moves to another one. When work doesn't hold up, it's refused. And the money waits in an escrow that pays only for steps that made it into your model.
Live on Base Sepolia · test USDC only · no token · 8% fee, only when a job succeeds
Measured on the 4 Nov run: one run, one seed, local chain. See how
Three ways in. Each card does something before you click it.
One download, one command. Paid in USDC for every step the network accepts.
Not a promise: it depends on demand. Rates: Vast.ai median, late Oct 2026 (joulemath.com).
Watch a real run survive a dead GPU, then pay only for what was accepted.
Watch the runProof of reserves, the full journal and each provider's own terms, read from the chain by your browser.
Open the ledgerYour browser reads these straight from the chain every 15 seconds. Open the full ledger
A host can vanish an hour in, you pay for the time either way, and nothing tells you if the work is real. Crypto networks added tokens, not answers. Here's what goes wrong today, with sources, and what GPUChain does instead.
The GPU disappears mid-run
Marketplace hosts can be stopped at any time. Saving and resuming is left to you. ClusterBid
You pay for time, not results
Billing runs every few minutes whether the run works. Spent credits aren't refunded. Vast.ai billing
Bad work looks like good work
GPUs differ, so results can't be recomputed exactly. Most networks fall back on reputation. arXiv 2501.05374
Paid in a token that swings
Many networks pay providers in their own token, which puts off hosts who just want dollars. Aethir
Rewarded for showing up
Token emissions pay nodes for existing, which invites fake ones. Tokenomics.net
The chain can't see the work
Corrupted renders were returned on one network in 2025, with no on-chain way to catch them. Cointelegraph
Is the money really there?
You take the platform's word for balances.
Point at any part. Every step happens on-chain or in a signed record you can check.
Escrow
The contract holds the money. Not even we can move it; only a verdict signed by the verifiers can.
See it livePoint at any part of the diagram.
A simulation in your browser, with made-up numbers. Stop a provider or make it cheat, then watch where the work goes and who gets paid.
Ready when you are
step 000 / 200
Where the 1.00 USDC goes
Paid per accepted step. Refused or lost work earns nothing.
A simplified simulation running in your browser, with made-up speeds and prices. The real run is further down.
Nobody has to step in. You can watch every step on the dashboard.
01
A provider stops answering. The coordinator marks it lost and fences off its worker.
02
A replacement provider resumes from a trusted checkpoint, with micro-batches resized to fit its memory. In this run the providers shared one GPU.
03
In this run two verifiers evaluated selected checkpoints against the last accepted one. A failed test meant that work did not count.
04
Escrow pays each provider for the steps it put into the accepted model and refunds the rest.
Training loss, every step, straight from the recording
Lower is better. Hover or drag across it to see any step.