On-Chain Bundle: multiple Ethereum mainnet reads in one paid call. Parts: eth_mainnet_erc20_totalsupply, eth_mainnet_contract_abi, eth_mainnet_eth_getcode. Returns: each named part service's own result, in one paid call, keyed by the part's name -- exactly what each part returns when bought alone; the call succeeds only when every part answers. It takes the union of the parts' query parameters.

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