Billing

Billing and x402

Cloudgrad is prepaid. You hold a credit in USDG, and running computers spend it by the second.

Price

Cloud computer	0.60 USDG an hour (0.000167 a second)
Always-on computer	0.05 USDG an hour
Saved computer	Free
New account	30 minutes free

The x402 flow

Billing follows x402. When an action needs credit, the API answers 402 Payment Required with what to pay; the client pays on chain and retries with proof.

Client→POST /api/computersServer

Server→402 Payment Required + accepts[USDG, payTo, amount]Client

Wallet→USDG transfer on chain 4663Robinhood Chain

Client→POST /api/credits X-PAYMENT: {txHash}Server

Server→reads the receipt, checks Transfer(from you, to payTo)Neon ledger

Server→200 + X-PAYMENT-RESPONSE, credit addedClient

Paying from the app

Under Credit, choose an amount and press Pay with wallet. Your wallet switches to Robinhood Chain and sends a USDG transfer to the payment address. The app sends the transaction hash to the server, which reads the receipt, checks that USDG moved from your signed-in wallet to the payment address, and credits the amount. A hash credits once. If the page closes before that, paste the hash under Credit and press Verify.

USDG	`0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168` (6 decimals)
Pay to	`0x3F745575b764288403b2A079A9e79FaC525F08Cb`
Network	Robinhood Chain, `eip155:4663`

Paying from an agent

# what does 10 USDG of credit look like?
curl -i "https://cloudgrad.org/api/credits?amount=10"
# HTTP/1.1 402 Payment Required
# {"x402Version":1,"accepts":[{"scheme":"exact","network":"eip155:4663",
#   "asset":"0x5fc5360D0400a0Fd4f2af552ADD042D716F1d168","payTo":"0x3F745575b764288403b2A079A9e79FaC525F08Cb","maxAmountRequired":"10000000", ...}]}

# after the transfer, settle with the session cookie of the paying wallet
curl -X POST "https://cloudgrad.org/api/credits" -b "cg_session=..." \
  -H "X-PAYMENT: $(echo -n '{"txHash":"0x..."}' | base64)"

Ledger

Every top-up, free grant and second of use is a row in the ledger, shown in the app with links to the transactions. Credit has no expiry.