Reading the faucet…
Base Sepolia testnet
aUSD faucet
Priced calls on AirnodeHub are paid in aUSD, API3's test dollar on Base Sepolia, so trying one costs nothing real. Each account can mint up to the faucet limit, in total over all its mints.
A mint is a transaction, so the account needs Base Sepolia ETH for its gas, from Coinbase's faucet or Alchemy's. Paying for a call needs no ETH. To mint without a browser wallet, call mintFromFaucet on the token.