POST
/
95e61622bf6a8af293978377718e3b77
/
wallet
/
triggerconstantcontract
wallet/triggerconstantcontract
curl --request POST \
  --url https://tron-mainnet.core.chainstack.com/95e61622bf6a8af293978377718e3b77/wallet/triggerconstantcontract \
  --header 'Content-Type: application/json' \
  --data '{
  "owner_address": "41b487cdb2d8dc7b2a8e5e7e7b4e3e8b8b8b8b8b",
  "contract_address": "41a614f803b6fd780986a42c78ec9c7f77e6ded13c",
  "function_selector": "balanceOf(address)",
  "parameter": "000000000000000000000000b487cdb2d8dc7b2a8e5e7e7b4e3e8b8b8b8b8b"
}'
{
  "result": {
    "result": true
  },
  "energy_used": 123,
  "constant_result": [
    "<string>"
  ],
  "transaction": {}
}
TRON API method that calls a constant (read-only) smart contract method without consuming energy or bandwidth. This method allows you to query contract state and call view functions without broadcasting a transaction to the blockchain.
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​
Parameters

  • owner_address — (optional) address calling the contract method in hexadecimal format
  • contract_address — smart contract address to call in hexadecimal format
  • function_selector — function signature or selector (e.g., “balanceOf(address)”)
  • parameter — (optional) encoded parameters for the function call in hexadecimal format

​
Response

  • result — execution result object containing:
    • result — boolean indicating if the call was successful
  • energy_used — estimated energy consumption if this were a real transaction
  • constant_result — array of return values from the contract method in hexadecimal format
  • transaction — transaction object that would be created (for reference, not executed)

​
Use case

The wallet/triggerconstantcontract method is used for:
  • Calling read-only smart contract methods to query blockchain state.
  • Reading token balances, contract variables, and other view data without costs.
  • Testing contract method calls before executing actual transactions.
  • Building user interfaces that need to display current contract state.
  • Implementing contract interaction tools that require state queries.
  • Estimating energy costs for contract method calls before execution.

Body

application/json
​
contract_address
string
required

Smart contract address in hex format

​
function_selector
string
required

Function selector (method signature) to call

​
owner_address
string

Address calling the contract method in hex format

​
parameter
string

Encoded parameters for the function call

Response

200 - application/json

Contract call result

​
result
object
​
energy_used
number

Energy that would be consumed (for estimation)

​
constant_result
string[]

Return values from the contract method call

​
transaction
object

Transaction object that would be created (not executed)