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A fresh wallet holds nothing: no stablecoin to move and no ETH to pay gas with. The fastest fix is the built-in faucet; wallets can also simply receive funds like any on-chain address.

Option 1: The faucet

One call sends test stablecoin and tops up Sepolia ETH for gas:
Details worth knowing:
  • amount is optional. Omit it for the deployment’s default faucet amount, or pass a decimal string like "250" to request a specific amount.
  • Two legs, one call. The ETH top-up and the stablecoin transfer are separate operator transactions; the stablecoin leg’s hash appears in settlementTxHash.
  • Rolling 24-hour cap. Faucet volume is capped per account over a rolling day. Exceeding it returns 400; the cap resets as old requests age out.
  • Works for external wallets too: the faucet is a plain on-chain send, so watch-only addresses can receive it.
If the faucet returns 502 faucet_failed, the sandbox operator wallet is out of stablecoin or ETH; that’s an operational issue on the platform side, not something your integration can fix. See Troubleshooting.

Option 2: Receive from anyone

Every wallet is a real Sepolia address. Share it and receive stablecoin, cAROUSD, or ETH from any counterparty:
  • Dashboard: the Receive screen shows the address, a QR code, a copy button, and a downloadable address card.
  • API: fetch the address from GET /wallets/{id}, or produce a shareable .nota address card with GET /wallets/{id}/nota.
Fiat on-ramps (bank transfer, card, Ramp, MoonPay, Transak) appear in the dashboard as coming soon; in the sandbox, the faucet plays their role.

Verify the result

You should see normal.amount increased and a healthy eth.amount for gas. From here, mint cAROUSD to step onto the confidential rail.