title
JSON-RPC v3

Goloop JSON-RPC API v3

Introduction

This document explains JSON-RPC APIs (version 3) available to interact with Goloop nodes.

The API end point is http://<host>:<port>/api/v3/<channel>

If there is one channel or there is a default channel then you may skip channel name. Channel name of the chain will be set on configuring the channel. It may use hexadecimal string of NID if it's not specified (ex: a34 for 0xa34). For ICON networks, they uses icon_dex as channel name.

Refer following documents for extended APIs

BTP Extension for Websocket, ICON Block
BTP2 Extension for BTP Block

Value Types

Basically, every VALUE in JSON-RPC message is string. Below table shows the most common "VALUE types".

VALUE type	Description	Example
T_ADDR_EOA	"hx" + 40 digit HEX string	hxbe258ceb872e08851f1f59694dac2558708ece11
T_ADDR_SCORE	"cx" + 40 digit HEX string	cxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32
T_HASH	"0x" + 64 digit HEX string	0xc71303ef8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238
T_INT	"0x" + lowercase HEX string. No zero padding.	0xa
T_BOOL	"0x1" for 'true', "0x0" for 'false'	0x1
T_BIN_DATA	"0x" + lowercase HEX string. Length must be even.	0x34b2
T_SIG	base64 encoded string	VAia7YZ2Ji6igKWzjR2YsGa2m53nKPrfK7uXYW78QLE+ATehAVZPC40szvAiA6NEU5gCYB4c4qaQzqDh2ugcHgA=
T_DATA_TYPE	Type of data	call, deploy or message
T_STRING	normal string	test, hello, ...

Failure Code

Following is a list of failure codes.

Name	Value	Description
UNKNOWN_FAILURE	1	An uncategorized internal system error occurred.
CONTRACT_NOT_FOUND	2	There is no valid contract on the target address.
METHOD_NOT_FOUND	3	The specified method does not exist or is not usable.
METHOD_NOT_PAYABLE	4	The specified method is not payable.
ILLEGAL_FORMAT	5	An Illegal method parameter or decorator has been declared.
INVALID_PARAMETER	6	An invalid parameter has been passed to a method.
INVALID_INSTANCE	7	An object has not been derived from the appropriate base class.
INVALID_CONTAINER_ACCESS	8	Invalid container access occurred.
ACCESS_DENIED	9	Access operation is denied, typically due to a database permission check.
OUT_OF_STEP	10	Out of step
OUT_OF_BALANCE	11	Out of balance
TIMEOUT_ERROR	12	Timeout error
STACK_OVERFLOW	13	Too deep inter-call
SKIP_TRANSACTION	14	The transaction is not executed.
REVERTED	32 ~ 999	End with revert request.(by Revision5, it was limited to 99)

JSON-RPC Failure

Failure object example

{
  "code" : -32700,
  "message": "Parse error"
}

Timeout object example

{
  "code" : -31006,
  "message": "Timeout",
  "data": "0x402b630c5ed80d1b8f0d89ca14a091084bcc0f6a98bc52329bccc045415bc0bd"
}

icx_sendTransactionAndWait and icx_waitTransactionResult may return one of timeout errors. In those cases, it would have transaction hash in data field.

Error Codes

Below table shows the default error messages for the error code. Actual message may vary depending on the implementation.

Category	Error code	Message	Description
Json Parsing	-32700	Parse error	Invalid JSON was received by the server. An error occurred on the server while parsing the JSON text.
RPC Parsing	-32600	Invalid Request	The JSON sent is not a valid Request object.
	-32601	Method not found	The method does not exist / is not available.
	-32602	Invalid params	Invalid method parameter(s).
	-32603	Internal error	Internal JSON-RPC error.
Server Error	-32000 ~ -32099		Server error.
System Error	-31000	System Error	Unknown system error.
	-31001	Pool Overflow	Transaction pool overflow.
	-31002	Pending	Transaction is in the pool, but not included in the block.
	-31003	Executing	Transaction is included in the block, but it doesn’t have confirmed result.
	-31004	Not found	Requested data is not found.
	-31005	Lack of resource	Resource is not available.
	-31006	Timeout	Fail to get result of transaction in specified timeout
	-31007	System timeout	Fail to get result of transaction in system timeout (short time than specified)
SCORE Error	-30000 ~ -30999		Mapped errors from Failure code ( = -30000 - `value` )

JSON-RPC HTTP Header

You may set HTTP header for extension data of the request.

HTTP Header name : Icon-Options

Option	Description	Allowed APIs
timeout	Timeout for waiting in millisecond	icx_sendTransactionAndWait icx_waitTransactionResult

JSON-RPC Methods

icx_getLastBlock

Returns the last block information.

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_getLastBlock",
}

Parameters

None

Example responses

{
  "jsonrpc": "2.0",
  "result": {
    "block_hash": "8e25acc5b5c74375079d51828760821fc6f54283656620b1d5a715edcc0770c6",
     "confirmed_transaction_list": [
      {
        "from": "hx84f6c686fba03bc7ca65d15ae844ee56ff24a32b",
        "nid": "0x1",
        "signature": "tCUwOb6vsaUKy+NYvmzdJYC0jm3Erd5cR6wKnVuAjzMOECC+t/oK7fG/Tz2Y3C25o0AfCmbneXpias6xco+43wE=",
        "stepLimit": "0x3e8",
        "timestamp": "0x58a14bfe9b904",
        "to": "hx244deea00413d85c6637e7fdd53afa697f29d08f",
        "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f",
        "value": "0xa",
        "version": "0x3"
      }
     ],
    "height": 512,
    "merkle_tree_root_hash": "5c8d4e59ded657c6acbb67030929dfcaf114a268d6d58df53e7174e40db74158",
    "peer_id": "hx4208599c8f58fed475db747504a80a311a3af63b",
    "prev_block_hash": "0fdf04d13229482e3533948d4582344a3d44c399e71ab12c653ae57bcbee5d90",
    "signature": "",
    "time_stamp": 1559204699330360,
    "version": "2.0"
  },
  "id": "1001"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

icx_getBlockByHeight

Returns block information by block height.

Request

{
  "id": "1001",
  "jsonrpc": "2.0",
  "method": "icx_getBlockByHeight",
  "params": {
    "height": "0x100"
  }
}

Parameters

KEY	VALUE type	Description
height	T_INT	Integer of a block height

Example responses

{
  "jsonrpc": "2.0",
  "result": {
    "block_hash": "8e25acc5b5c74375079d51828760821fc6f54283656620b1d5a715edcc0770c6",
     "confirmed_transaction_list": [
      {
        "from": "hx84f6c686fba03bc7ca65d15ae844ee56ff24a32b",
        "nid": "0x1",
        "signature": "tCUwOb6vsaUKy+NYvmzdJYC0jm3Erd5cR6wKnVuAjzMOECC+t/oK7fG/Tz2Y3C25o0AfCmbneXpias6xco+43wE=",
        "stepLimit": "0x3e8",
        "timestamp": "0x58a14bfe9b904",
        "to": "hx244deea00413d85c6637e7fdd53afa697f29d08f",
        "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f",
        "value": "0xa",
        "version": "0x3"
      }
     ],
    "height": 512,
    "merkle_tree_root_hash": "5c8d4e59ded657c6acbb67030929dfcaf114a268d6d58df53e7174e40db74158",
    "peer_id": "hx4208599c8f58fed475db747504a80a311a3af63b",
    "prev_block_hash": "0fdf04d13229482e3533948d4582344a3d44c399e71ab12c653ae57bcbee5d90",
    "signature": "",
    "time_stamp": 1559204699330360,
    "version": "2.0"
  },
  "id": "1001"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

icx_getBlockByHash

Returns block information by block hash.

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_getBlockByHash",
  "params": {
      "hash": "8e25acc5b5c74375079d51828760821fc6f54283656620b1d5a715edcc0770c6"
  }
}

Parameters

KEY	VALUE type	Description
hash	T_HASH	Hash of a block

Example responses

{
  "jsonrpc": "2.0",
  "result": {
    "block_hash": "8e25acc5b5c74375079d51828760821fc6f54283656620b1d5a715edcc0770c6",
     "confirmed_transaction_list": [
      {
        "from": "hx84f6c686fba03bc7ca65d15ae844ee56ff24a32b",
        "nid": "0x1",
        "signature": "tCUwOb6vsaUKy+NYvmzdJYC0jm3Erd5cR6wKnVuAjzMOECC+t/oK7fG/Tz2Y3C25o0AfCmbneXpias6xco+43wE=",
        "stepLimit": "0x3e8",
        "timestamp": "0x58a14bfe9b904",
        "to": "hx244deea00413d85c6637e7fdd53afa697f29d08f",
        "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f",
        "value": "0xa",
        "version": "0x3"
      }
     ],
    "height": 512,
    "merkle_tree_root_hash": "5c8d4e59ded657c6acbb67030929dfcaf114a268d6d58df53e7174e40db74158",
    "peer_id": "hx4208599c8f58fed475db747504a80a311a3af63b",
    "prev_block_hash": "0fdf04d13229482e3533948d4582344a3d44c399e71ab12c653ae57bcbee5d90",
    "signature": "",
    "time_stamp": 1559204699330360,
    "version": "2.0"
  },
  "id": "1001"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

icx_call

Calls SCORE's external function.

Does not make state transition (i.e., read-only).

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_call",
  "params": {
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11", // TX sender address
        "to": "cxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32",   // SCORE address
        "dataType": "call",
        "data": {
            "method": "get_balance", // SCORE external function
            "params": {
                "address": "hx1f9a3310f60a03934b917509c86442db703cbd52" // input parameter of "get_balance"
            }
        }
    }
}

Parameters

KEY	VALUE type	Required	Description
from	T_ADDR_EOA	required	Message sender's address.
to	T_ADDR_SCORE	required	SCORE address that will handle the message.
height	T_INT	optional	Integer of a block height
dataType	T_DATA_TYPE	required	`call` is the only possible data type.
data	JSON object	required	See Parameters - data.
data.method	JSON string	required	Name of the function.
data.params	JSON object	required	Parameters to be passed to the function.

Example responses

{
  "jsonrpc": "2.0",
  "result": "0x2961fff8ca4a62327800000",
  "id": 1001
}

Responses

Status	Meaning	Description	Schema
200	OK	Success

icx_getBalance

Returns the ICX balance of the given EOA or SCORE.

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_getBalance",
   "params": {
        "address": "hxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32"
    }
}

Parameters

KEY	VALUE type	Required	Description
address	T_ADDR_EOA or T_ADDR_SCORE	required	Address of EOA or SCORE
height	T_INT	optional	Integer of a block height

Example responses

{
  "id": 1001,
  "jsonrpc": "2.0",
  "result": "0xde0b6b3a7640000"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success

icx_getScoreApi

Returns SCORE's external API list.

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_getScoreApi",
  "params": {
      "address": "cxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32"  // SCORE address
  }
}

Parameters

KEY	VALUE type	Required	Description
address	T_ADDR_SCORE	required	SCORE address to be examined.
height	T_INT	optional	Integer of a block height

Example responses

{
    "jsonrpc": "2.0",
    "id": 1234,
    "result": [
        {
            "type": "function",
            "name": "balanceOf",
            "inputs": [
                {
                    "name": "_owner",
                    "type": "Address"
                }
            ],
            "outputs": [
                {
                    "type": "int"
                }
            ],
            "readonly": "0x1"
        },
        {
            "type": "eventlog",
            "name": "FundTransfer",
            "inputs": [
                {
                    "name": "backer",
                    "type": "Address",
                    "indexed": "0x1"
                },
                {
                    "name": "amount",
                    "type": "int",
                    "indexed": "0x1"
                },
                {
                    "name": "is_contribution",
                    "type": "bool",
                    "indexed": "0x1"
                }
            ]
        },
        {...}
    ]
}

Responses

Status	Meaning	Description	Schema
200	OK	Success

Fields containing information about the function
- type : function, fallback, or eventlog
- name : function name
- inputs : parameters in array
  - name : parameter name
  - type : parameter type (int, str, bytes, bool, Address)
  - default: the default value if the parameter has a default value (optional)
  - indexed : 0x1 if the parameter is indexed (when this is eventlog) (optional)
- outputs : return value
  - type : return value type (int, str, bytes, bool, Address, dict, list)
- readonly : 0x1 if this is declared as external(readonly=True)
- payable : 0x1 if this has payable decorator

icx_getTotalSupply

Returns total ICX coin supply that has been issued.

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_getTotalSupply"
}

Parameters

KEY	VALUE type	Required	Description
height	T_INT	optional	Integer of a block height

Example responses

{
  "id": 1001,
  "jsonrpc": "2.0",
  "result": "0x2961fff8ca4a62327800000"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success

icx_getTransactionResult

Returns the transaction result requested by transaction hash.

Request

{
  "jsonrpc": "2.0",
  "id": "1001",
  "method": "icx_getTransactionResult",
  "params": {
    "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f"
  }
}

Parameters

KEY	VALUE type	Description
txHash	T_HASH	Hash of the transaction

Example responses

{
  "jsonrpc": "2.0",
  "result": {
    "blockHash": "0x8ef3b2a67262b9b1fe4b598059774472e9ccef401734335d87a4ba998cfd40fb",
    "blockHeight": "0x200",
    "cumulativeStepUsed": "0x0",
    "eventLogs": [],
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "status": "0x1",
    "stepPrice": "0x0",
    "stepUsed": "0x0",
    "to": "hx244deea00413d85c6637e7fdd53afa697f29d08f",
    "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f",
    "txIndex": "0x0"
  },
  "id": "1001"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

Transaction Result

KEY	VALUE type	Description
status	T_INT	1 on success, 0 on failure.
to	T_ADDR_EOA or T_ADDR_SCORE	Recipient address of the transaction
failure	JSON object	This field exists when status is 0. Please refer failure object
txHash	T_HASH	Transaction hash
txIndex	T_INT	Transaction index in the block
blockHeight	T_INT	Height of the block that includes the transaction.
blockHash	T_HASH	Hash of the block that includes the transaction.
cumulativeStepUsed	T_INT	Sum of stepUsed by this transaction and all preceding transactions in the same block.
stepUsed	T_INT	The amount of step used by this transaction.
stepPrice	T_INT	The step price used by this transaction.
scoreAddress	T_ADDR_SCORE	SCORE address if the transaction created a new SCORE. (optional)
eventLogs	T_ARRAY	Array of eventlogs, which this transaction generated.
logsBloom	T_BIN_DATA	Bloom filter to quickly retrieve related eventlogs.

Failure object

KEY	VALUE type	Description
code	T_INT	Failure code.
message	T_STRING	Message for the failure.

icx_getTransactionByHash

Returns the transaction information requested by transaction hash.

Request

{
  "jsonrpc": "2.0",
  "id": "1001",
  "method": "icx_getTransactionByHash",
  "params": {
    "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f"
  }
}

Parameters

KEY	VALUE type	Description
txHash	T_HASH	Hash of the transaction

Example responses

{
  "jsonrpc": "2.0",
  "result": {
    "blockHash": "0x8ef3b2a67262b9b1fe4b598059774472e9ccef401734335d87a4ba998cfd40fb",
    "blockHeight": "0x200",
    "from": "hx84f6c686fba03bc7ca65d15ae844ee56ff24a32b",
    "nid": "0x1",
    "signature": "tCUwOb6vsaUKy+NYvmzdJYC0jm3Erd5cR6wKnVuAjzMOECC+t/oK7fG/Tz2Y3C25o0AfCmbneXpias6xco+43wE=",
    "stepLimit": "0x3e8",
    "timestamp": "0x58a14bfe9b904",
    "to": "hx244deea00413d85c6637e7fdd53afa697f29d08f",
    "txHash": "0xd8da71e926052b960def61c64f325412772f8e986f888685bc87c0bc046c2d9f",
    "txIndex": "0x0",
    "value": "0xa",
    "version": "0x3"
  },
  "id": "1001"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

KEY	VALUE type	Description
version	T_INT	Protocol version ("0x3" for V3)
from	T_ADDR_EOA	EOA address that created the transaction
to	T_ADDR_EOA or T_ADDR_SCORE	EOA address to receive coins, or SCORE address to execute the transaction.
value	T_INT	Amount of ICX coins in loop to transfer. When omitted, assumes 0. (1 icx = 1 ^ 18 loop)
stepLimit	T_INT	Maximum step allowance that can be used by the transaction.
timestamp	T_INT	Transaction creation time. Timestamp is in microsecond.
nid	T_INT	Network ID
nonce	T_INT	An arbitrary number used to prevent transaction hash collision.
txHash	T_HASH	Transaction hash
txIndex	T_INT	Transaction index in a block. Null when it is pending.
blockHeight	T_INT	Block height where this transaction was in. Null when it is pending.
blockHash	T_HASH	Hash of the block where this transaction was in. Null when it is pending.
signature	T_SIG	Signature of the transaction.
dataType	T_DATA_TYPE	Type of data. (call, deploy, message or deposit)
data	JSON object	Contains various type of data depending on the dataType. See Parameters - data.

icx_sendTransaction

You can do one of the followings using this function.

Transfer designated amount of ICX coins from 'from' address to 'to' address.
Install a new SCORE.
Update the SCORE in the 'to' address.
Invoke a function of the SCORE in the 'to' address.
Transfer a message.
Change deposit of the SCORE.

This function causes state transition.

Coin transfer

{
    "jsonrpc": "2.0",
    "method": "icx_sendTransaction",
    "id": 1234,
    "params": {
        "version": "0x3",
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "to": "hx5bfdb090f43a808005ffc27c25b213145e80b7cd",
        "value": "0xde0b6b3a7640000",
        "stepLimit": "0x12345",
        "timestamp": "0x563a6cf330136",
        "nid": "0x3",
        "nonce": "0x1",
        "signature": "VAia7YZ2Ji6igKWzjR2YsGa2m53nKPrfK7uXYW78QLE+ATehAVZPC40szvAiA6NEU5gCYB4c4qaQzqDh2ugcHgA="
    }
}

SCORE function call

{
    "jsonrpc": "2.0",
    "method": "icx_sendTransaction",
    "id": 1234,
    "params": {
        "version": "0x3",
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "to": "cxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32",
        "stepLimit": "0x12345",
        "timestamp": "0x563a6cf330136",
        "nid": "0x3",
        "nonce": "0x1",
        "signature": "VAia7YZ2Ji6igKWzjR2YsGa2m53nKPrfK7uXYW78QLE+ATehAVZPC40szvAiA6NEU5gCYB4c4qaQzqDh2ugcHgA=",
        "dataType": "call",
        "data": {
            "method": "transfer",
            "params": {
                "to": "hxab2d8215eab14bc6bdd8bfb2c8151257032ecd8b",
                "value": "0x1"
            }
        }
    }
}

SCORE install

{
    "jsonrpc": "2.0",
    "method": "icx_sendTransaction",
    "id": 1234,
    "params": {
        "version": "0x3",
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "to": "cx0000000000000000000000000000000000000000", // address 0 means SCORE install
        "stepLimit": "0x12345",
        "timestamp": "0x563a6cf330136",
        "nid": "0x3",
        "nonce": "0x1",
        "signature": "VAia7YZ2Ji6igKWzjR2YsGa2m53nKPrfK7uXYW78QLE+ATehAVZPC40szvAiA6NEU5gCYB4c4qaQzqDh2ugcHgA=",
        "dataType": "deploy",
        "data": {
            "contentType": "application/zip",
            "content": "0x1867291283973610982301923812873419826abcdef91827319263187263a7326e...", // compressed SCORE data
            "params": {  // parameters to be passed to on_install()
                "name": "ABCToken",
                "symbol": "abc",
                "decimals": "0x12"
            }
        }
    }
}

SCORE update

{
    "jsonrpc": "2.0",
    "method": "icx_sendTransaction",
    "id": 1234,
    "params": {
        "version": "0x3",
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "to": "cxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32", // SCORE address to be updated
        "stepLimit": "0x12345",
        "timestamp": "0x563a6cf330136",
        "nid": "0x3",
        "nonce": "0x1",
        "signature": "VAia7YZ2Ji6igKWzjR2YsGa2m53nKPrfK7uXYW78QLE+ATehAVZPC40szvAiA6NEU5gCYB4c4qaQzqDh2ugcHgA=",
        "dataType": "deploy",
        "data": {
            "contentType": "application/zip",
            "content": "0x1867291283973610982301923812873419826abcdef91827319263187263a7326e...", // compressed SCORE data
            "params": {  // parameters to be passed to on_update()
                "amount": "0x1234"
            }
        }
    }
}

Message transfer

{
    "jsonrpc": "2.0",
    "method": "icx_sendTransaction",
    "id": 1234,
    "params": {
        "version": "0x3",
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "to": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "stepLimit": "0x12345",
        "timestamp": "0x563a6cf330136",
        "nid": "0x3",
        "nonce": "0x1",
        "signature": "VAia7YZ2Ji6igKWzjR2YsGa2m53nKPrfK7uXYW78QLE+ATehAVZPC40szvAiA6NEU5gCYB4c4qaQzqDh2ugcHgA=",
        "dataType": "message",
        "data": "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"
    }
}

Deposit add

{
    "jsonrpc": "2.0",
    "method": "icx_sendTransaction",
    "id": 1234,
    "params": {
        "version": "0x3",
        "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
        "timestamp": "0x563a6cf330136",
        "to": "cx2f501ff91ad48732673adf55a04f36d466cf269c",
        "stepLimit": "0x50000000",
        "nid": "0x3",
        "nonce": "0x1",
        "value": "0x10f0cf064dd59200000",
        "dataType": "deposit",
        "data": {
            "action": "add",
        }
    }
}

Parameters

KEY	VALUE type	Required	Description
version	T_INT	required	Protocol version ("0x3" for V3)
from	T_ADDR_EOA	required	EOA address that created the transaction
to	T_ADDR_EOA or T_ADDR_SCORE	required	EOA address to receive coins, or SCORE address to execute the transaction.
value	T_INT	optional	Amount of ICX coins in loop to transfer. When omitted, assumes 0. (1 icx = 1 ^ 18 loop)
stepLimit	T_INT	required	Maximum step allowance that can be used by the transaction.
timestamp	T_INT	required	Transaction creation time. Timestamp is in microsecond.
nid	T_INT	required	Network ID ("0x1" for Mainnet, "0x2" for Testnet, etc)
nonce	T_INT	optional	An arbitrary number used to prevent transaction hash collision.
signature	T_SIG	required	Signature of the transaction.
dataType	T_DATA_TYPE	optional	Type of data. (call, deploy, message or deposit)
data	JSON object	optional	The content of data varies depending on the dataType. See Parameters - data.

Parameters - data

data contains the following data in various formats depending on the dataType.

dataType == call

It is used when calling a function in SCORE, and data has dictionary value as follows.

KEY	VALUE type	Required	Description
method	String	required	Name of the function to invoke in SCORE
params	JSON object	optional	Function parameters

dataType == deploy

It is used when installing or updating a SCORE, and data has dictionary value as follows.

KEY	VALUE type	Required	Description
contentType	String	required	Mime-type of the content
content	T_BIN_DATA	required	Compressed SCORE data
params	JSON object	optional	Function parameters will be delivered to on_install() or on_update()

dataType == message

It is used when transferring a message, and data has a HEX string.

dataType == deposit

It is used to change deposit.

KEY	VALUE type	Required	Description
action	String	required	Action to do. ( add, withdraw )
id	T_HASH	optional	ID of the deposit to withdraw
amount	T_INT	optional	Amount of deposit to withdraw

While the action is add, it uses coin value for adding a limited deposit or increasing the unlimited deposit. The deposit would be used for paying used steps by the transaction.

While the action is withdraw, id must be set for the limited deposit. Otherwise, it may set amount for partial withdrawal for the unlimited deposit.

Case	data.action	data.id	data.amount	value
Add deposit	`add`			amount to add
Withdraw limited deposit	`withdraw`	ID of the deposit
Withdraw a part of unlimited deposit	`withdraw`		amount to withdraw
Withdraw whole of unlimited deposit	`withdraw`

Example responses

{
  "jsonrpc": "2.0",
  "result": "0x402b630c5ed80d1b8f0d89ca14a091084bcc0f6a98bc52329bccc045415bc0bd",
  "id": "1001"
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

Transaction hash (T_HASH) on success
Error code and message on failure

icx_sendTransactionAndWait

It sends a transaction like icx_sendTransaction, then it will wait for the result of it for specified time. If the timeout isn't set by user, it uses defaultWaitTimeout.

It's disabled by default. It can be enabled by setting defaultWaitTimeout as none-zero value.

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

Same response value(Transaction Result) as icx_getTransactionResult on success
Error code, message and data on failure
data field of failure will be transaction hash(T_HASH) on timeout

icx_waitTransactionResult

It will wait for the result of the transaction for specified time. If the timeout isn't set by user, it uses defaultWaitTimeout.

It's disabled by default. It can be enabled by setting defaultWaitTimeout as none-zero value.

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

Same response value(Transaction Result) as icx_getTransactionResult on success
Error code, message and data on failure
data field of failure will be transaction hash(T_HASH) on timeout

icx_getScoreStatus

It returns status information of the smart contract.

Request

{
  "id": 1001,
  "jsonrpc": "2.0",
  "method": "icx_getScoreStatus",
  "params": {
    "address": "cxb0776ee37f5b45bfaea8cff1d8232fbb6122ec32"
  }
}

Parameters

KEY	VALUE type	Required	Description
address	T_ADDR_SCORE	required	SCORE address to be examined.
height	T_INT	optional	Integer of a block height

Example responses

{
  "jsonrpc": "2.0",
  "id": 1001,
  "result": {
      "current": {
        "auditTxHash": "0x5ba8712782563fec86bbd6381a5a38c40ed74fc945f2f5c43321354d66343c0a",
        "codeHash": "0x7c7e4e67727a5f6c11f03dab37333e50ed6d47c243b4e486eaaa05d407fd3c84",
        "deployTxHash": "0x5ba8712782563fec86bbd6381a5a38c40ed74fc945f2f5c43321354d66343c0a",
        "type": "python",
        "status": "active"
      },
      "depositInfo": {
        "availableDeposit": "0x10f0cf064dd59200000",
        "availableVirtualStep": "0x0",
        "deposits": [
          {
            "depositRemain": "0x10f0cf064dd59200000"
          }
        ]
      },
      "owner": "hxff9221db215ce1a511cbe0a12ff9eb70be4e5764",
      "useSystemDeposit": "0x1"
  }
}

Response

Status	Meaning	Description	Schema
200	OK	Success	ScoreStatus

SCORE Status as result on success
Error code, message and data on failure
Given address isn't valid contract address, it returns failure.

SCORE Status

KEY	VALUE type	Description
owner	T_ADDR_SCORE	Owner of the score
blocked	T_BOOL	`0x1` if it's blocked by governance
disabled	T_BOOL	`0x1` if it's disabled by owner
useSystemDeposit	T_BOOL	`0x1` if it uses system deposit
current	Contract Status	Current contract
next	Contract Status	Next contract to be audited
depositInfo	Deposit Information	Deposit information

Contract Status

KEY	VALUE type	Description
status	T_STRING	Status of the contract
deployTxHash	T_HASH	TX Hash for deploy
auditTxHash	T_HASH	TX Hash for audit
type	T_STRING	Type of the code (one of system,java,python)
codeHash	T_HASH	Hash of the code

Deposit Information

KEY	VALUE type	Description
availableDeposit	T_INT	Available deposit amount
availableVirtualStep	T_INT	Available virtual steps(deprecated)
deposits	a list of Deposits	Remaining deposits

Deposit

Deposit V1

KEY	VALUE type	Description
id	T_HASH	ID of deposit
depositRemain	T_INT	Available deposit amount
depositUsed	T_INT	Used deposit amount
expires	T_INT	Expiration block height
virtualStepIssued	T_INT	Issued virtual steps
virtualStepUsed	T_INT	Used virtual steps

Deposit V2

KEY	VALUE type	Description
depositRemain	T_INT	Available deposit amount

icx_getNetworkInfo

It returns basic network information

Request

{
  "id": 1002,
  "jsonrpc": "2.0",
  "method": "icx_getNetworkInfo"
}

Response

Status	Meaning	Description	Schema
200	OK	Success	Network Information

Network Information as result on success
Error code, message and data on failure

Network Information

KEY	VALUE type	Description
platform	T_STRING	Name of the platform
nid	T_INT	Network ID of the current channel
channel	T_STRING	Name of the current channel
earliest	T_INT	Height of the earliest block
latest	T_INT	Height of the latest finalized block
stepPrice	T_INT	Price of the step

JSON-RPC Debug

The debug end point is http://<host>:<port>/api/v3d/<channel>

A rule for channel name in main end point is applied.

APIs for debug endpoint.

debug_estimateStep
debug_getTrace

debug_getTrace

Returns the trace logs of the transaction

Request

{
  "jsonrpc": "2.0",
  "id": "1001",
  "method": "debug_getTrace",
  "params": {
    "txHash": "0x4f4feed4a1d29779f84460d663e1ffb894d65dacfa3cc215a353a4b0d0d8f020"
  }
}

Parameters

KEY	VALUE type	Required	Description
hash	T_HASH	required	Hash value of the transaction

Example responses

{
  "jsonrpc": "2.0",
  "result": {
    "logs": [
      {
        "level": 2,
        "msg": "FRAME[1] TRANSACTION start from=hx92b7608c53825241069a280982c4d92e1b228c84 to=cx9e3cadcc1a4be3323ea23371b84575abb32703ae id=0x4f4feed4a1d29779f84460d663e1ffb894d65dacfa3cc215a353a4b0d0d8f020",
        "ts": 0
      },
      {
        "level": 2,
        "msg": "FRAME[1] STEP apply type=default count=1 cost=100000 total=100000",
        "ts": 108
      },
      {
        "level": 2,
        "msg": "FRAME[1] STEP apply type=input count=101 cost=20200 total=120200",
        "ts": 112
      },
      {
        "level": 2,
        "msg": "FRAME[1] TRANSACTION charge fee=2054062500000000 steps=164325 price=12500000000",
        "ts": 1097
      },
      {
        "level": 2,
        "msg": "FRAME[1] TRANSACTION done status=Success steps=164325 price=12500000000",
        "ts": 1108
      }
    ],
    "status": "0x1"
  },
  "id": 100
}

Responses

Status	Meaning	Description	Schema
200	OK	Success	Block

Trace Logs

KEY	VALUE type	Description
logs	JSON array	Array of Trace Log

Trace Log

KEY	VALUE type	Description
level	JSON number	Log level(0:Trace, 1:Debug, 2:System)
msg	JSON string	Log message
ts	JSON number	Time offset from the beginning in micro-second

debug_estimateStep

Returns an estimated step of how much step is necessary to allow the transaction to complete. The transaction will not be added to the blockchain. Note that the estimation can be larger than the actual amount of step to be used by the transaction for several reasons such as node performance.

Request

{
  "jsonrpc": "2.0",
  "method": "debug_estimateStep",
  "id": 1234,
  "params": {
    "version": "0x3",
    "from": "hxbe258ceb872e08851f1f59694dac2558708ece11",
    "to": "hx5bfdb090f43a808005ffc27c25b213145e80b7cd",
    "value": "0xde0b6b3a7640000",
    "timestamp": "0x563a6cf330136",
    "nid": "0x3",
    "nonce": "0x1"
  }
}

Parameters

The transaction information without stepLimit and signature

KEY	VALUE type	Required	Description
version	T_INT	required	Protocol version ("0x3" for V3)
from	T_ADDR_EOA	required	EOA address that created the transaction
to	T_ADDR_EOA or T_ADDR_SCORE	required	EOA address to receive coins, or SCORE address to execute the transaction.
value	T_INT	optional	Amount of ICX coins in loop to transfer. When ommitted, assumes 0. (1 icx = 1 ^ 18 loop)
timestamp	T_INT	required	Transaction creation time. timestamp is in microsecond.
nid	T_INT	required	Network ID ("0x1" for Mainnet, "0x2" for Testnet, etc)
nonce	T_INT	optional	An arbitrary number used to prevent transaction hash collision.
dataType	T_DATA_TYPE	optional	Type of data. (call, deploy, or message)
data	JSON dict or JSON string	optional	The content of data varies depending on the dataType. See Parameters - data.

Response

The amount of an estimated step

Response - success

{
    "jsonrpc": "2.0",
    "id": 1234,
    "result": "0x109eb0"
}

Response - failure

{
    "jsonrpc": "2.0",
    "id": 1234,
    "error": {
        "code": -32602,
        "message": "JSON schema validation error: 'version' is a required property"
    }
}

Files

jsonrpc_v3.md

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jsonrpc_v3.md

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Goloop JSON-RPC API v3

Introduction

Value Types

Failure Code

JSON-RPC Failure

Error Codes

JSON-RPC HTTP Header

JSON-RPC Methods

icx_getLastBlock

Parameters

Responses

icx_getBlockByHeight

Parameters

Responses

icx_getBlockByHash

Parameters

Responses

icx_call

Parameters

Responses

icx_getBalance

Parameters

Responses

icx_getScoreApi

Parameters

Responses

icx_getTotalSupply

Parameters

Responses

icx_getTransactionResult

Parameters

Responses

icx_getTransactionByHash

Parameters

Responses

icx_sendTransaction

Parameters

Parameters - data

dataType == call

dataType == deploy

dataType == message

dataType == deposit

Responses

icx_sendTransactionAndWait

Responses

icx_waitTransactionResult

Responses

icx_getScoreStatus

Parameters

Response

icx_getNetworkInfo

Response

JSON-RPC Debug

debug_getTrace

Parameters

Responses

debug_estimateStep

Parameters

Response