READ-ONLY EXAMPLE / eth_getBalance
{
"jsonrpc": "2.0",
"id": 1,
"method": "eth_getBalance",
"params": [
"0x0000000000000000000000000000000000000000",
"latest"
]
}Start with native reads
Use an Ethereum RPC endpoint from your own node or provider to ask a specific question about the network. A native balance request is a useful first exercise: keep the address, network, block reference, and raw result together instead of passing a bare number straight into a card.
A focused method map
| Question | Method | Keep in mind |
|---|---|---|
| Which chain is this? | eth_chainId | Compare with your expected configuration. |
| What is the native balance? | eth_getBalance | Result is a hexadecimal quantity in wei. |
| What does a contract read return? | eth_call | Interpret data with the relevant contract interface. |
Design the adapter boundary
Validate the response envelope before formatting the result. Keep transport errors separate from RPC errors. Preserve exact quantities, and define how block context and missing data will appear in your application.
A native ETH balance is not a complete token inventory. Build that as a separate feature with explicit asset identifiers and metadata handling.
Primary reference: Ethereum JSON-RPC API. Check the upstream documentation for current method and integration details.
Go deeper
Follow the Ethereum balance walkthrough, then review token precision and event-index recovery.