Ethereum mainnet ETH balance for one address via eth_getBalance. Takes address (0x + 40 hex) and returns the hex balance in wei.

GET https://ari001.tailb4ac3a.ts.net/v1/ventures/x402_eth_reads_v1/eth_mainnet_eth_getbalance. Same payment terms as that HTTP route. Call once with no payment. The result is the payment terms. Retry the same call with the signed payment at _meta["x402/payment"]. Measured output: {"chain": "base", "hex": "0x0", "method": "eth_getBalance", "ok": true, "result": 0, "service": "x402_chain_reads_v1.base_eth_getbalance"}