Use when an agent, x402 test or CI job needs Base Sepolia gas now: one x402 call, no faucet login or mainnet history. Input: to (recipient address); sends 0.1 ETH (1 ETH: /v1/testnet/base-sepolia-eth/1). Output: JSON txHash (confirmed before settling), explorerUrl, amountEth, from, to. Daily limits (UTC): 5 ETH per address (both sizes), 20 overall; checked before payment. Test ETH has no monetary value. Example: ?to=0x000000000000000000000000000000000000dEaD

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