Web3 compatible JSON RPC APIs

JSON RPC API

JSON is a lightweight data-interchange format. It can represent numbers, strings, ordered sequences of values, and collections of name/value pairs.

JSON-RPC is a stateless, light-weight remote procedure call (RPC) protocol. Primarily this specification defines several data structures and the rules around their processing. It is transport agnostic in that the concepts can be used within the same process, over sockets, over HTTP, or in many various message passing environments. It uses JSON (RFC 4627) as data format.

HEX value encoding

At present there are two key datatypes that are passed over JSON: unformatted byte arrays and quantities. Both are passed with a hex encoding, however with different requirements to formatting:

When encoding QUANTITIES (integers, numbers): encode as hex, prefix with "0x", the most compact representation (slight exception: zero should be represented as "0x0"). Examples:

0x41 (65 in decimal)
0x400 (1024 in decimal)
WRONG: 0x (should always have at least one digit - zero is "0x0")
WRONG: 0x0400 (no leading zeroes allowed)
WRONG: ff (must be prefixed 0x)

When encoding UNFORMATTED DATA (byte arrays, account addresses, hashes, bytecode arrays): encode as hex, prefix with "0x", two hex digits per byte. Examples:

0x41 (size 1, "A")
0x004200 (size 3, "\0B\0")
0x (size 0, "")
WRONG: 0xf0f0f (must be even number of digits)
WRONG: 004200 (must be prefixed 0x)

The default block parameter

The following methods have an extra default block parameter:

eth_getBalance
eth_getCode
eth_getTransactionCount
eth_getStorageAt
eth_call

When requests are made that act on the state of KardiaChain, the last default block parameter determines the height of the block.

The following options are possible for the defaultBlock parameter:

HEX String - an integer block number
String "earliest" for the earliest/genesis block
String "latest" - for the latest mined block
String "pending" - for the pending state/transactions

Curl Examples Explained

The curl options might return a response where the node complains about the content type, this is because the --data option sets the content type to application/x-www-form-urlencoded . If your node does complain, manually set the header by placing -H "Content-Type: application/json" at the start of the call.

The examples also do not include the URL/IP & port combination which must be the last argument given to curl e.x. 127.0.0.1:8545

Web3-compatible JSON-RPC methods

The complete Postman collection with examples can be found here.

web3_clientVersion (also available as eth_clientVersion)
web3_sha3 (also available as eth_sha3)
net_version
eth_gasPrice
eth_blockNumber
eth_getBalance
eth_getTransactionCount
eth_getCode
eth_sendRawTransaction
eth_call
eth_estimateGas
eth_getBlockByHash
eth_getBlockByNumber
eth_getTransactionByHash
eth_getTransactionReceipt
eth_newFilter
eth_newBlockFilter
eth_newPendingTransactionFilter
eth_uninstallFilter
eth_getFilterChanges
eth_getFilterLogs
eth_getLogs
debug_traceTransaction
debug_traceCall
txpool_content
txpool_inspect
txpool_status

Web3-compatible JSON RPC APIs Reference

web3_clientVersion

Returns the current client version.

Parameters

none

Returns

String - The current client version

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "web3_clientVersion",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "KAI-Genesis-Validator-1/v1.5.0/linux-amd64/go1.14.12"
}

web3_sha3

Returns Keccak-256 (not the standardized SHA3-256) of the given data.

Parameters

none

Returns

Object - list of peers which current node connects to.

Example

DATA - the data to convert into a SHA3 hash

params: ["0x68656c6c6f20776f726c64"];

Returns

DATA - The SHA3 result of the given string.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "web3_sha3",
    "params": [
        "0x68656c6c6f20776f726c64"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad"
}

net_version

Returns the current network id.

Parameters

none

Returns

String - The current network id.

"0": KardiaChain Aris Mainnet
"69": KardiaChain Testnet

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "net_version",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0"
}

eth_gasPrice

Returns the current price per gas in HYDRO.

Parameters

none

Returns

QUANTITY - integer of the current gas price in wei.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_gasPrice",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x1dfd14000" // 8049999872 HYDRO
}

eth_blockNumber

Returns the height of the most recent block.

Parameters

none

Returns

QUANTITY - integer of the current block height the client is on.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_blockNumber",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x4b7" // 1207
}

eth_getBalance

Returns the balance of the account of given address.

Parameters

DATA, 20 Bytes - address to check for balance.
QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

params: [
  "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
  "latest", // state at the latest block
];

Returns

QUANTITY - integer of the current balance in HYDRO.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getBalance",
    "params": [
        "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
        "latest"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x0234c8a3397aab58" // 158972490234375000
}

eth_getTransactionCount

Returns the number of transactions sent from an address.

Parameters

DATA, 20 Bytes - address to check for balance.
QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

params: [
  "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
  "latest", // state at the latest block
];

Returns

QUANTITY - integer of the number of transactions send from this address.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionCount",
    "params": [
        "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
        "latest"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x1" // 1
}

eth_getCode

Returns code at a given address.

Parameters

DATA, 20 Bytes - address to check for code.
QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

params: [
  "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
  "latest", // state at the latest block
];

Returns

QUANTITY - integer of the number of transactions send from this address.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getCode",
    "params": [
        "0x407d73d8a49eeb85d32cf465507dd71d507100c1",
        "latest"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"
}

eth_getCode

Returns the value from a storage position at a given address.

Parameters

DATA, 20 Bytes - address of the storage.
QUANTITY - integer of the position in the storage.
QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

"params": [
    "0xe32Be8f73f0093dbef8b01705553ff299D609BF3",
    "0x0",
    "latest"
]

Returns

DATA - the value at this storage position.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getStorageAt",
    "params": [
        "0xe32Be8f73f0093dbef8b01705553ff299D609BF3",
        "0x0",
        "latest"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x00000000000000000000000000000000000000000000000000000000000003d2"
}

eth_sendRawTransaction

Creates new message call transaction or a contract creation for signed transactions.

Parameters

DATA, The signed transaction data.

params: [
  "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675",
];

Returns

DATA, 32 Bytes - the transaction hash, or the zero hash if the transaction is not yet available.

Use eth_getTransactionReceipt to get the contract address, after the transaction was mined, when you created a contract.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_sendRawTransaction",
    "params": [{see above}],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}

eth_call

Executes a new message call immediately without creating a transaction on the block chain.

Parameters

Object - The transaction call object.

from: DATA, 20 Bytes - (optional) The address the transaction is sent from.
to: DATA, 20 Bytes - The address the transaction is directed to.
gas: QUANTITY - (optional) Integer of the gas provided for the transaction execution. eth_call consumes zero gas, but this parameter may be needed by some executions.
gasPrice: QUANTITY - (optional) Integer of the gasPrice used for each paid gas.
value: QUANTITY - (optional) Integer of the value sent with this transaction.
data: DATA - (optional) Hash of the method signature and encoded parameters.

QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter.

Returns

DATA - the return value of executed contract.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_call",
    "params": [{see above}],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x"
}

eth_estimateGas

Generates and returns an estimate of how much gas is necessary to allow the transaction to complete. The transaction will not be added to the blockchain. Note that the estimate may be significantly more than the amount of gas actually used by the transaction, for a variety of reasons including KVM mechanics and node performance.

Parameters

See eth_call parameters, expect that all properties are optional. If no gas limit is specified geth uses the block gas limit from the pending block as an upper bound. As a result the returned estimate might not be enough to executed the call/transaction when the amount of gas is higher than the pending block gas limit.

Returns

QUANTITY - the amount of gas used.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_estimateGas",
    "params": [{see above}],
    "id": 1
}'

// Result
{
    "jsonrpc":"2.0",
    "id":1,
    "result": "0x7148" // 29000
}

eth_getBlockByHash

Returns information about a block by hash.

Parameters

DATA, 32 Bytes - Hash of a block.
Boolean - If true it returns the full transaction objects, if false only the hashes of the transactions.

params: [
  "0x985803c8e1ac9b60c91b786a40ca454fe2efbc2e5ff9e499c58f656ffa9bbc9e",
  false,
];

Returns

Object - A block object, or null when no block was found:

number: QUANTITY - the block number. null when its pending block.
hash: DATA, 32 Bytes - hash of the block. null when its pending block.
parentHash: DATA, 32 Bytes - hash of the parent block.
nonce: DATA, 8 Bytes - hash of the generated proof-of-work. null when its pending block.
sha3Uncles: DATA, 32 Bytes - SHA3 of the uncles data in the block.
logsBloom: DATA, 256 Bytes - the bloom filter for the logs of the block. null when its pending block.
transactionsRoot: DATA, 32 Bytes - the root of the transaction trie of the block.
stateRoot: DATA, 32 Bytes - the root of the final state trie of the block.
receiptsRoot: DATA, 32 Bytes - the root of the receipts trie of the block.
miner: DATA, 20 Bytes - address of the chosen proposer who finalizing this block.
difficulty: QUANTITY - integer of the difficulty for this block.
extraData: DATA - the “extra data” field of this block.
size: QUANTITY - integer the size of this block in bytes.
gasLimit: QUANTITY - the maximum gas allowed in this block.
gasUsed: QUANTITY - the total used gas by all transactions in this block.
timestamp: QUANTITY - the unix timestamp for when the block was collated.
transactions: Array - Array of transaction objects, or 32 Bytes transaction hashes depending on the last given parameter.
commitHash: DATA - hash of last commit. null when it's the pending block.
consensusHash: DATA, 32 Bytes - hash of the block consensus.
evidenceHash: DATA, 32 Bytes - hash evidences list.
mixHash: DATA, 32 Bytes - the hash that was used as an input to the PoW process.
validatorsHash: DATA, 32 Bytes - hash of the current validators set.
nextValidatorHash: DATA, 32 Bytes - hash of the next validators set.
numTxs: QUANTITY - the number of transactions in the block.

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByHash",
    "params": [
        "0x985803c8e1ac9b60c91b786a40ca454fe2efbc2e5ff9e499c58f656ffa9bbc9e",
        false
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "commitHash": "0x7ed0bf757e6ddd11e7843d5b6fba4d72fce699699abbf211932faff67595bee8",
        "consensusHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "difficulty": "0x000000",
        "evidenceHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "gasLimit": "0xbebc200",
        "gasUsed": "0x0",
        "hash": "0x985803c8e1ac9b60c91b786a40ca454fe2efbc2e5ff9e499c58f656ffa9bbc9e",
        "miner": "0x416dAadf88692d93Bdc0d89aB0bb149e3FFaF8bd",
        "mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "nextValidatorHash": "0x5faf550a59a635b588d37e08622f20ad8bd17347e22c1e0f9dfed1a3880180be",
        "nonce": "0x0000000000000000",
        "numTxs": "0x0",
        "number": "0x5",
        "parentHash": "0xcad31e5ab0ee5dbd834cb257fdd24eb68d539de24605e0c5567ecd093271d364",
        "receiptsRoot": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "sha3Uncles": "0x0000000000000000000000000000000000000000000000000000000000000000",
        "size": "0x000000",
        "stateRoot": "0x94544cbb95ab8ec6e13d7cdb6ca87cbcf030c46d34d63248432bef7892c5d326",
        "timestamp": "0x5feb1a68",
        "transactions": [],
        "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
        "validatorHash": "0x5faf550a59a635b588d37e08622f20ad8bd17347e22c1e0f9dfed1a3880180be"
    }
}

eth_getBlockByNumber

Returns information about a block by block number.

Parameters

QUANTITY|TAG - integer of a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.
Boolean - If true it returns the full transaction objects, if false only the hashes of the transactions.

"params": [
    "0x5",
    true
]

Returns

See eth_getBlockByHash

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getBlockByNumber",
    "params": [
        "0x5",
        true
    ],
    "id": 1
}'

Result see eth_getBlockByHash

eth_getTransactionByHash

Returns the information about a transaction requested by transaction hash.

Parameters

DATA, 32 Bytes - hash of a transaction

params: ["0x50366c39b8103bccb9f4f2691adf3141aa66c2412acd2cbfe78e9150f7c68f47"];

Returns

Object - A transaction object, or null when no transaction was found:

blockHash: DATA, 32 Bytes - hash of the block where this transaction was in. null when its pending.
blockNumber: QUANTITY - block number where this transaction was in. null when its pending.
from: DATA, 20 Bytes - address of the sender.
gas: QUANTITY - gas provided by the sender.
gasPrice: QUANTITY - gas price provided by the sender in HYDRO.
hash: DATA, 32 Bytes - hash of the transaction.
input: DATA - the data send along with the transaction.
nonce: QUANTITY - the number of transactions made by the sender prior to this one.
to: DATA, 20 Bytes - address of the receiver. null when its a contract creation transaction.
transactionIndex: QUANTITY - integer of the transactions index position in the block. null when its pending.
value: QUANTITY - value transferred in HYDRO.
v: QUANTITY - ECDSA recovery id
r: DATA, 32 Bytes - ECDSA signature r
s: DATA, 32 Bytes - ECDSA signature s

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionByHash",
    "params": [
        "0x50366c39b8103bccb9f4f2691adf3141aa66c2412acd2cbfe78e9150f7c68f47"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "blockHash": "0xd6dbf385a6beeeb9c685074215133ef8874569854b1e74420bd2445e0db86826",
        "blockNumber": "0x494ef2",
        "from": "0x0eb8d1732d150bb32dc54b605ded3e4ed85905d9",
        "gas": "0x4c4b40",
        "gasPrice": "0x3b9aca00",
        "hash": "0x50366c39b8103bccb9f4f2691adf3141aa66c2412acd2cbfe78e9150f7c68f47",
        "input": "0xb4ab979e0000000000000000000000000000000000000000000000000000000000000d0d",
        "nonce": "0x3836",
        "to": "0xe5daa2925c7e6bc9e6f46abd6d0c4004c287919f",
        "transactionIndex": "0x9",
        "value": "0x0",
        "type": "0x0",
        "v": "0x1c",
        "r": "0x2159c7600bdf1ae58e72a10343fd97cc69949044939c7152f5d656a177eea5dc",
        "s": "0x211df45ba39f4aed506375944fa70d0177c930c3396f782c5fe493a0b4ac6855"
    }
}

eth_getTransactionReceipt

Returns the receipt of a transaction by transaction hash.

Note That the receipt is not available for pending transactions.

Parameters

DATA, 32 Bytes - hash of a transaction.

Returns

Object - A transaction receipt object, or null when no receipt was found:

transactionHash : DATA, 32 Bytes - hash of the transaction.
transactionIndex: QUANTITY - integer of the transactions index position in the block.
blockHash: DATA, 32 Bytes - hash of the block where this transaction was in.
blockNumber: QUANTITY - block number where this transaction was in.
from: DATA, 20 Bytes - address of the sender.
to: DATA, 20 Bytes - address of the receiver. null when its a contract creation transaction.
cumulativeGasUsed : QUANTITY - The total amount of gas used when this transaction was executed in the block.
gasUsed : QUANTITY - The amount of gas used by this specific transaction alone.
contractAddress : DATA, 20 Bytes - The contract address created, if the transaction was a contract creation, otherwise null.
logs: Array - Array of log objects, which this transaction generated.
logsBloom: DATA, 256 Bytes - Bloom filter for light clients to quickly retrieve related logs.
status: QUANTITY either 1 (success) or 0 (failure)

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getTransactionReceipt",
    "params": [
        "0x50366c39b8103bccb9f4f2691adf3141aa66c2412acd2cbfe78e9150f7c68f47"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "blockHash": "0xd6dbf385a6beeeb9c685074215133ef8874569854b1e74420bd2445e0db86826",
        "blockNumber": "0x494ef2",
        "contractAddress": null,
        "cumulativeGasUsed": "0x11d9a9",
        "from": "0x0eb8d1732d150bb32dc54b605ded3e4ed85905d9",
        "gasUsed": "0xc04a",
        "logs": [
            {
                "address": "0xe5daa2925c7e6bc9e6f46abd6d0c4004c287919f",
                "topics": [
                    "0x046d39ff823e39e327f08e23e6db8f8947f1a3b2ec30af9fb8057506960d6ad0"
                ],
                "data": "0x0000000000000000000000000000000000000000000000000000000000000d0d0000000000000000000000000000000000000000000000000000000000001612000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000616907c0",
                "blockNumber": "0x494ef2",
                "transactionHash": "0x50366c39b8103bccb9f4f2691adf3141aa66c2412acd2cbfe78e9150f7c68f47",
                "transactionIndex": "0x9",
                "blockHash": "0xd6dbf385a6beeeb9c685074215133ef8874569854b1e74420bd2445e0db86826",
                "logIndex": "0x2f",
                "removed": false
            }
        ],
        "logsBloom": "0x00280000000000000000001080100000000000001400000800000010000000002200000001180000000004800000010009440000002000000000100000240000000000000c00000000000008000080200000000000040008080000400000000400000006020000100000400008000800000000000000000008004011000000080000000020000800000100000220000000000000080000080000004000000000020000000001000000000000000000000000040000000000100001000010080000000002000000000000000040000040000000000000045000002000000060000090040004000001000000000040020008000002400000004000000000000000",
        "status": "0x1",
        "to": "0xe5daa2925c7e6bc9e6f46abd6d0c4004c287919f",
        "transactionHash": "0x50366c39b8103bccb9f4f2691adf3141aa66c2412acd2cbfe78e9150f7c68f47",
        "transactionIndex": "0x9"
    }
}

eth_newFilter

Creates a filter object, based on filter options, to notify when the state changes (logs). To check if the state has changed, call eth_getFilterChanges.

A note on specifying topic filters:

Topics are order-dependent. A transaction with a log with topics [A, B] will be matched by the following topic filters:

[] “anything”
[A] “A in first position (and anything after)”
[null, B] “anything in first position AND B in second position (and anything after)”
[A, B] “A in first position AND B in second position (and anything after)”
[[A, B], [A, B]] “(A OR B) in first position AND (A OR B) in second position (and anything after)”

Parameters

Object - The filter options:

fromBlock: QUANTITY|TAG - (optional, default: "latest") Integer block number, or "latest" for the last mined block or "pending", "earliest" for not yet mined transactions.
toBlock: QUANTITY|TAG - (optional, default: "latest") Integer block number, or "latest" for the last mined block or "pending", "earliest" for not yet mined transactions.
address: DATA|Array, 20 Bytes - (optional) Contract address, or a list of addresses from which logs should originate.
topics: Array of DATA, - (optional) Array of 32 Bytes DATA topics. Topics are order-dependent. Each topic can also be an array of DATA with “or” options.

"params": [
    {
        "fromBlock": "0x49518c",
        "toBlock": "0x49518c",
        "address": "0x5995F16246DfA676A44B8bD7E751C1226093dcd7",
        "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
    }
]

Returns

QUANTITY - A filter id.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [
        {
            "fromBlock": "0x49518c",
            "toBlock": "0x49518c",
            "address": "0x5995F16246DfA676A44B8bD7E751C1226093dcd7",
            "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
        }
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0x19698b2fad447503894bbeb1255c6804"
}

eth_newBlockFilter

Creates a filter in the node, to notify when a new block arrives. To check if the state has changed, call eth_getFilterChanges.

Parameters

None

Returns

QUANTITY - A filter id.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_newBlockFilter",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0xa673a699237c1e2a4f10093ea11b3f1b"
}

eth_newPendingTransactionFilter

Creates a filter in the node, to notify when new pending transactions arrive. To check if the state has changed, call eth_getFilterChanges.

Parameters

None

Returns

QUANTITY - A filter id.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_newPendingTransactionFilter",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": "0xa673a699237c1e2a4f10093ea11b3f1b"
}

eth_uninstallFilter

Uninstalls a filter with given id. Should always be called when watch is no longer needed. Additonally Filters timeout when they aren’t requested with eth_getFilterChanges for a period of time.

Parameters

QUANTITY - The filter id.

"params": [
    "0xa0eaf5f4cfdaa2841e2ceb82e3d3eb86"
]

Returns

Boolean - true if the filter was successfully uninstalled, otherwise false.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_uninstallFilter",
    "params": [
        "0xa0eaf5f4cfdaa2841e2ceb82e3d3eb86"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": true
}

eth_getFilterChanges

Polling method for a filter, which returns an array of logs which occurred since last poll.

Parameters

QUANTITY - The filter id.

"params": [
    "0xa0eaf5f4cfdaa2841e2ceb82e3d3eb86"
]

Returns

Array - Array of log objects, or an empty array if nothing has changed since last poll.

For filters created with eth_newBlockFilter the return are block hashes (DATA, 32 Bytes), e.g. ["0x3454645634534..."].
For filters created with eth_newPendingTransactionFilter the return are transaction hashes (DATA, 32 Bytes), e.g. ["0x6345343454645..."].
For filters created with eth_newFilter logs are objects with following params:
- removed: TAG - true when the log was removed, due to a chain reorganization. false if its a valid log.
- logIndex: QUANTITY - integer of the log index position in the block. null when its pending log.
- transactionIndex: QUANTITY - integer of the transactions index position log was created from. null when its pending log.
- transactionHash: DATA, 32 Bytes - hash of the transactions this log was created from. null when its pending log.
- blockHash: DATA, 32 Bytes - hash of the block where this log was in. null when its pending log.
- blockNumber: QUANTITY - the block number where this log was in. null when its pending log.
- address: DATA, 20 Bytes - address from which this log originated.
- data: DATA - contains one or more 32 Bytes non-indexed arguments of the log.
- topics: Array of DATA - Array of 0 to 4 32 Bytes 1 of indexed log arguments. (In solidity: The first topic is the hash of the signature of the event (e.g. Deposit(address,bytes32,uint256)), except you declared the event with the anonymous specifier.)

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": [
        "0x2dc54beff33d85789d9d4ec173bbe94e"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": [
        {
            "address": "0x5995f16246dfa676a44b8bd7e751c1226093dcd7",
            "topics": [
                "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
                "0x0000000000000000000000005b60a5761047b3a9ec340941d904231be85f5c0b",
                "0x000000000000000000000000037d453c6e2c80c25615bc17b12335e81726ad1d"
            ],
            "data": "0x000000000000000000000000000000000000000000000000000b6e9e2273d80b",
            "blockNumber": "0x495236",
            "transactionHash": "0x3dcddf8948678431731a0e38c7418f5d8b0c0c4b08953e5668a72dfbba6e75b6",
            "transactionIndex": "0x4",
            "blockHash": "0x3ead7c291a04c3c3757d77702e02265c6a03a60ea4253403de7093511fc780af",
            "logIndex": "0xd",
            "removed": false
        }
    ]
}

eth_getFilterLogs

Returns an array of all logs matching filter with given id.

Parameters

QUANTITY - The filter id.

"params": [
    "0xa0eaf5f4cfdaa2841e2ceb82e3d3eb86"
]

Returns

See eth_getFilterChanges.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterLogs",
    "params": [
        "0xa0eaf5f4cfdaa2841e2ceb82e3d3eb86"
    ],
    "id": 1
}'

Result see eth_getFilterChanges.

eth_getLogs

Returns an array of all logs matching a given filter object.

Parameters

Object - The filter options:

fromBlock: QUANTITY|TAG - (optional, default: "latest") Integer block number, or "latest" for the last mined block or "pending", "earliest" for not yet mined transactions.
toBlock: QUANTITY|TAG - (optional, default: "latest") Integer block number, or "latest" for the last mined block or "pending", "earliest" for not yet mined transactions.
address: DATA|Array, 20 Bytes - (optional) Contract address or a list of addresses from which logs should originate.
topics: Array of DATA, - (optional) Array of 32 Bytes DATA topics. Topics are order-dependent. Each topic can also be an array of DATA with “or” options.
blockhash: DATA, 32 Bytes - (optional) blockHash will be a new filter option which restricts the logs returned to the single block with the 32-byte hash blockHash. Using blockHash is equivalent to fromBlock = toBlock = the block number with hash blockHash. If blockHash is present in in the filter criteria, then neither fromBlock nor toBlock are allowed.

params: [
  {
    fromBlock: "0x49518c",
    toBlock: "0x49518c",
    address: "0x5995F16246DfA676A44B8bD7E751C1226093dcd7",
    topics: [
      "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef",
    ],
  },
];

Returns

See eth_getFilterChanges.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "eth_getLogs",
    "params": [
        {
            "fromBlock": "0x49518c",
            "toBlock": "0x49518c",
            "address": "0x5995F16246DfA676A44B8bD7E751C1226093dcd7",
            "topics": ["0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"]
        }
    ],
    "id": 1
}'

Result see eth_getFilterChanges.

debug_traceTransaction

The traceTransaction debugging method will attempt to run the transaction in the exact same manner as it was executed on the network. It will replay any transaction that may have been executed prior to this one before it will finally attempt to execute the transaction that corresponds to the given hash.

In addition to the hash of the transaction you may give it a secondary optional argument, which specifies the options for this specific call.

Parameters

DATA - hash of the transaction to debug

The possible optional arguments are:

disableStorage: BOOL - Setting this to true will disable storage capture (default = false).
disableMemory: BOOL - Setting this to true will disable memory capture (default = false).
disableStack: BOOL - Setting this to true will disable stack capture (default = false).
tracer: STRING - Setting this will enable JavaScript-based transaction tracing, described below. If set, the previous four arguments will be ignored.
timeout: STRING - Overrides the default timeout of 5 seconds for JavaScript-based tracing calls. Valid values are described (here)[https://pkg.go.dev/time#ParseDuration].

"params": [
    "0x8271c264a56ee5dee332f771b7e309a749d20b2db19dd178adf6308a440fd25e",
    {"tracer": "{data: [], fault: function(log) {}, step: function(log) { if(log.op.toString() == \"PUSH1\") this.data.push(log.stack.peek(0)); }, result: function() { return this.data; }}"}
]

Returns

Object - debugging and execution details of a transaction.

gas: QUANTITY - gas used by the transaction.
failed: Boolean - true if the transaction is reverted during execution, otherwise false.
returnValue: DATA - the returned value of the transaction call.
revertReason: String - the reason makes the transaction reverted, defined by the require command in solidity.
structLogs: Array of Object - details of each OPCODE execution during the transaction execution.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "debug_traceTransaction",
    "params": [
        "0x8271c264a56ee5dee332f771b7e309a749d20b2db19dd178adf6308a440fd25e"
    ],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "gas": 48736,
        "failed": false,
        "returnValue": "",
        "revertReason": "",
        "structLogs": [
            {
                "pc": 0,
                "op": "PUSH1",
                "gas": 4970472,
                "gasCost": 3,
                "depth": 1,
                "stack": [],
                "memory": [],
                "storage": {}
            },...
        ]
    }
}

debug_traceCall

The debug_traceCall method lets you run an eth_call within the context of the given block execution using the final state of parent block as the base. The block can be specified either by hash or by number. It takes the same input object as a eth_call. It returns the same output as debug_traceTransaction. A tracer can be specified as a third argument, similar to debug_traceTransaction.

Parameters

See eth_call

Returns

See debug_traceTransaction

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "debug_traceCall",
    "params": [
        {
            "data": "0x70a0823100000000000000000000000005C5cCf9d97B212D9F7D959fE8e0F669192A2FD1",
            "from": "0xE6c93752e359272e25f9940E97E730d76d87A8b8",
            "gasPrice": "0x0",
            "to": "0x1790A6be515A88d5d972224098bC5A7EBdb01F8C",
            "value": "0x0"
        },
        "latest",
        {"disableStorage":true, "disableMemory": true}
    ],
    "id": 1
}'

Result see debug_traceTransaction

txpool_content

The content inspection property can be queried to list the exact details of all the transactions currently pending for inclusion in the next block(s), as well as the ones that are being scheduled for future execution only.

The result is an object with two fields pending and queued. Each of these fields are associative arrays, in which each entry maps an origin-address to a batch of scheduled transactions. These batches themselves are maps associating nonces with actual transactions.

Please note, there may be multiple transactions associated with the same account and nonce. This can happen if the user broadcast mutliple ones with varying gas allowances (or even completely different transactions).

Parameters

None

Returns

Object - contains pending and queued transactions in pool.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "txpool_content",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "pending": {
            "0x4A956d227b2045369eB00C586288ACC3A1E53637": {
                "0": {
                    "blockHash": null,
                    "blockNumber": null,
                    "from": "0x4a956d227b2045369eb00c586288acc3a1e53637",
                    "gas": "0x7148",
                    "gasPrice": "0x3b9aca00",
                    "hash": "0x0d5f595c6a3e9ece537d61fe2b36b53bb515b1f6976152151ca20aaaba3a7174",
                    "input": "0x",
                    "nonce": "0x0",
                    "to": "0x0e78afee688769865b56226a9eb29bc0c6629e9b",
                    "transactionIndex": null,
                    "value": "0xde0b6b3a7640000",
                    "v": "0x1c",
                    "r": "0xec5ec2774fd95f70cafac11e23bfaee14ae0e1c9ccc9f2a5b0b8f7f3c23fc3e4",
                    "s": "0x1325b62fe8200bc2d5bb4e1d9fce17f46bef9683baa0f9085101b8477f1a856a"
                }
            }
        },
        "queued": {
            "0x4A956d227b2045369eB00C586288ACC3A1E53637": {
                "3": {
                    "blockHash": null,
                    "blockNumber": null,
                    "from": "0x4a956d227b2045369eb00c586288acc3a1e53637",
                    "gas": "0x7148",
                    "gasPrice": "0x4190ab00",
                    "hash": "0x413ff0f02f17961661af4cf70cf83f78ccc4d7885f11ef49cb162d5731c227a6",
                    "input": "0x",
                    "nonce": "0x3",
                    "to": "0x0e78afee688769865b56226a9eb29bc0c6629e9b",
                    "transactionIndex": null,
                    "value": "0xde0b6b3a7640000",
                    "v": "0x1c",
                    "r": "0x79c87b41fbdf19272a3ae6f552452e1ce5817adddda0b32f28a738aaaeff9435",
                    "s": "0x4eb4427642a821e35fc13e792a4250f0ec9c9a3135d991216b35b393d961964"
                }
            }
        }
    }
}

txpool_inspect

The inspect inspection property can be queried to list a textual summary of all the transactions currently pending for inclusion in the next block(s), as well as the ones that are being scheduled for future execution only. This is a method specifically tailored to developers to quickly see the transactions in the pool and find any potential issues.

The result is an object with two fields pending and queued. Each of these fields are associative arrays, in which each entry maps an origin-address to a batch of scheduled transactions. These batches themselves are maps associating nonces with transactions summary strings.

Please note, there may be multiple transactions associated with the same account and nonce. This can happen if the user broadcast mutliple ones with varying gas allowances (or even completely different transactions).

Parameters

None

Returns

Object - contains pending and queued transactions with nonce, hash and transaction fee details in pool.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "txpool_content",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "pending": {
            "0x0D9580eA6B89cBE589EE6687FfB40AcB1C5435a1": {
                "318": "0xE5dAA2925C7E6Bc9e6F46aBd6d0c4004C287919f: 0 HYDRO + 5000000 gas × 1000000000 HYDRO"
            }
            "0x934F52e8FB4De610868a9bebD4649f482BBFF201": {
                "38": "0xc80ACe0aC969397F96a8E1c97D21B4759fAFeB1E: 0 HYDRO + 3000000 gas × 1000000000 HYDRO",
                "39": "0xc80ACe0aC969397F96a8E1c97D21B4759fAFeB1E: 0 HYDRO + 3000000 gas × 1000000000 HYDRO"
            }
        },
        "queued": {
            "0x39B3ddAb4A0264191d9a32791A232bD8b58D09FC": {
                "19361": "0xF981cF6DC8831Fe6D62E93e682eA40605953C2EF: 0 HYDRO + 300000 gas × 10000000000 HYDRO",
                "19362": "0xF981cF6DC8831Fe6D62E93e682eA40605953C2EF: 0 HYDRO + 300000 gas × 10000000000 HYDRO"
            },
            "0xAbbc7eCfc5da1e8ce456DF8Cb38a40c5a8698458": {
                "843": "0xE5dAA2925C7E6Bc9e6F46aBd6d0c4004C287919f: 0 HYDRO + 5000000 gas × 1000000000 HYDRO"
            }
        }
    }
}

txpool_status

The status inspection property can be queried for the number of transactions currently pending for inclusion in the next block(s), as well as the ones that are being scheduled for future execution only.

The result is an object with two fields pending and queued, each of which is a counter representing the number of transactions in that particular state.

Parameters

None

Returns

Object - contains total number of pending and queued transactions currently in pool.

Example

// Request
curl --location --request POST 'https://rpc.kardiachain.io/' \
--header "Content-Type: application/json" \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "txpool_status",
    "params": [],
    "id": 1
}'

// Result
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": {
        "pending": "0x7",
        "queued": "0x3"
    }
}