eth_getBalance

Returns the ETH balance of an account at a given block. Use the pending tag for 200ms pre-confirmed balances.

Returns the ETH balance of an address at a given block.

Flashblocks: Query https://mainnet.base.org with "pending" to read balances updated every ~200ms — before the block seals.

Parameters

address · string · required

The 20-byte address to query.

block · string · required

Block number in hex, or "latest", "pending", "safe", "finalized", "earliest". Use "pending" for pre-confirmed balance.

Returns

result · string

The balance in wei as a hexadecimal string.

Example

Standard (latest)

curl https://mainnet.base.org \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": ["0x742d35Cc6634C0532925a3b8D4C9dD0b4f3BaEa", "latest"],
    "id": 1
  }'