Query Balances

This guide will cover the following query methods:
  • blockxd & Tendermint RPC
  • JSON-RPC
  • gRPC

blockxd & Tendermint RPC

Upon installation and configuration of the BlockX Daemon, developers can query account balances using blockxd with the following CLI command:
$ blockxd query bank balances $BLOCKXADDRESS --count-total=$COUNTTOTAL --height=$HEIGHT --output=$OUTPUT --node=$NODE
balances:
- amount: "1000000000000000000"
denom: abcx
- amount: "100000"
denom: ibc/ED07A3391A112B175915CD8FAF43A2DA8E4790EDE12566649D0C2F97716B8518
pagination:
next_key: null
total: "0"
where:
  • $BLOCKXADDRESS is the BlockX address with balances of interest (eg. blockx1...).
  • (optional) $COUNTTOTAL counts the total number of records in all balances to query for.
  • (optional) $HEIGHT is the specific height to query state at (can error if node is pruning state).
  • (optional) $OUTPUT is the output format (eg. text).
  • (optional if running local node) $NODE is the Tendermint RPC node information is requested from
Details of non-native currencies (ie. not ablockx) can be queried with the following CLI command:
$ blockxd query erc20 token-pair $DENOM --node=$NODE --height=$HEIGHT --output=$OUTPUT
token_pair:
contract_owner: OWNER_MODULE
denom: ibc/ED07A3391A112B175915CD8FAF43A2DA8E4790EDE12566649D0C2F97716B8518
enabled: true
erc20_address: 0xFA3C22C069B9556A4B2f7EcE1Ee3B467909f4864
where $DENOM is the denomination of the coin (eg. ibc/ED07A3391A1...).

JSON-RPC

Developers can query account balances of ablockx using the eth_getBalance JSON-RPC method in conjunction with curl:
# Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBalance","params":[`$ETHADDRESS`, `$BLOCK`],"id":1}' -H "Content-Type: application/json" $NODE
# Result
{"jsonrpc":"2.0","id":1,"result":"0x36354d5575577c8000"}
where:
  • $ETHADDRESS is the Etherum hex-address the balance is to be queried from. Note that BlockX addresses
  • $BLOCK is the block number or block hash (eg. "0x0"). The reasoning for this parameter is due to EIP-1898.
  • (optional if running local node) $NODE is the JSON-RPC node information is requested from
Developers can also query account balances of x/erc20-module registered coins using the eth_call JSON-RPC method in conjunction with curl:
# Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"from":`SENDERCONTRACTADDRESS`, "to":`ERCCONTRACTADDRESS`, "data":`$DATA`}, `$BLOCK`],"id":1}' -H "Content-Type: application/json" $NODE
# Result
{"jsonrpc":"2.0","id":1,"result":"0x"}
where:
  • $SENDERCONTRACTADDRESS is the Ethereum hex-address this smart contract call is sent from.
  • $ERCCONTRACTADDRESS is the Ethereum hex-address of the ERC-20 contract corresponding to the coin denomination being queried.
  • $DATA is the hash of the balanceof method signature and encoded parameters. balanceOf is a required method in every ERC-20 contract, and the encoded parameter is the address which is having its balance queried. For additional information, see the Ethereum Contract ABI.
  • $BLOCK is the block number or block hash (eg. "0x0"). The reasoning for this parameter is due to EIP-1898.
  • (optional if running local node) $NODE is the JSON-RPC node information is requested from

gRPC

Developers can use grpcurl with the AllBalances endpoint to query account balance by address for all denominations:
# Request
grpcurl $OUTPUT -d '{"address":`$BLOCKXADDRESS`}' $NODE cosmos.bank.v1beta1.Query/AllBalances
# Result
{
"balances": [
{
"denom": "stake",
"amount": "1000000000"
}
],
"pagination": {
"total": "1"
}
}
where:
  • $BCXADDRESS is the BlockX address with balances of interest (eg. "blockx1...").
  • $NODE is the Cosmos gRPC node information is requested
  • (optional) $OUTPUT is the output format (eg. plaintext).
State can also be queried using gRPC within a Go program. The idea is to create a gRPC connection, then use the Protobuf-generated client code to query the gRPC server.
import (
"context"
"fmt"
"google.golang.org/grpc"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/tx"
)
func queryState() error {
myAddress, err := GetBlockXAddressFromBech32("blockx1...") // blockx address with balances of interest.
if err != nil {
return err
}
// Create a connection to the gRPC server.
grpcConn := grpc.Dial(
"https://grpc.bd.blockxnet.com:9090", // your gRPC server address.
grpc.WithInsecure(), // the SDK doesn't support any transport security mechanism.
)
defer grpcConn.Close()
// This creates a gRPC client to query the x/bank service.
bankClient := banktypes.NewQueryClient(grpcConn)
bankRes, err := bankClient.AllBalances(
context.Background(),
&banktypes.QueryAllBalancesRequest{Address: myAddress},
)
if err != nil {
return err
}
fmt.Println(bankRes.GetBalances()) // prints the account balances.
return nil
}