Call when an agent needs the latest Ethereum mainnet block number. Send tag latest, or an empty object. Read-only eth_blockNumber on eip155:1. No spend. Send JSON {"tag":"latest"}. Exact $0.001 USDC on Base. Try unpaid POST /v1/sandbox/eth-block-number first.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.001000 USDC | 0x1D61...5a38 |