JSON-RPC

In order for a software application to interact with the Electroneum Smart Chain - either by reading blockchain data or sending transactions to the network - it must connect to an Electroneum Smart Chain node.

For this purpose, every Electroneum Smart Chain client implements a JSON-RPC specification↗, so there is a uniform set of methods that applications can rely on regardless of the specific node or client implementation.

JSON-RPC↗ is a stateless, light-weight remote procedure call (RPC) protocol. It 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.

Convenience libraries

While you may choose to interact directly with Electroneum Smart Chain clients via the JSON-RPC API, there are often easier options for dapp developers. Many JavaScript libraries exist to provide wrappers on top of the JSON-RPC API. With these libraries, developers can write intuitive, one-line methods in the programming language of their choice to initialize JSON-RPC requests (under the hood) that interact with the Electroneum Smart Chain.

Conventions

Hex value encoding

Two key data types get passed over JSON: unformatted byte arrays and quantities. Both are passed with a hex encoding but with different requirements for formatting.

Quantities

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

Here are some 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)

Unformatted data

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

Here are some 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 Electroneum Smart Chain, 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 "safe" - for the latest safe head block

• String "finalized" - for the latest finalized block

• String "pending" - for the pending state/transactions

Examples

On this page we provide examples of how to use individual JSON_RPC API endpoints using the command line tool, curl↗. These individual endpoint examples are found below in the Curl examples section. Further down the page, we also provide an end-to-end example for compiling and deploying a smart contract using a ETN-SC node, the JSON_RPC API and curl.

Curl examples

Examples of using the JSON_RPC API by making curl↗ requests to an Electroneum Smart Chain node are provided below. Each example includes a description of the specific endpoint, its parameters, return type, and a worked example of how it should be used.

The curl requests might return an error message relating to the content type. This is because the --data option sets the content type to application/x-www-form-urlencoded. If your node does complain about this, 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.g. 127.0.0.1:8545). A complete curl request including these additional data takes the following form:

curl -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}' 127.0.0.1:8545

Gossip, State, History

A handful of core JSON-RPC methods require data from the Electroneum Smart Chain network, and fall neatly into three main categories: Gossip, State, and History. Use the links in these sections to jump to each method, or use the table of contents to explore the whole list of methods.

Gossip Methods

These methods track the head of the chain. This is how transactions make their way around the network, find their way into blocks, and how clients find out about new blocks.

• eth_blockNumber

• eth_sendRawTransaction

State Methods

Methods that report the current state of all the data stored. The "state" is like one big shared piece of RAM, and includes account balances, contract data, and gas estimations.

• eth_getBalance

• eth_getStorageAt

• eth_getTransactionCount

• eth_getCode

• eth_call

• eth_estimateGas

History Methods

Fetches historical records of every block back to genesis. This is like one large append-only file, and includes all block headers, block bodies, uncle blocks, and transaction receipts.

• eth_getBlockTransactionCountByHash

• eth_getBlockTransactionCountByNumber

• eth_getUncleCountByBlockHash

• eth_getUncleCountByBlockNumber

• eth_getBlockByHash

• eth_getBlockByNumber

• eth_getTransactionByHash

• eth_getTransactionByBlockHashAndIndex

• eth_getTransactionByBlockNumberAndIndex

• eth_getTransactionReceipt

• eth_getUncleByBlockHashAndIndex

• eth_getUncleByBlockNumberAndIndex

JSON-RPC API Methods

web3_clientVersion

Returns the current client version.

Parameters

None

Returns

String - The current client version

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"web3_clientVersion","params":[],"id":67}'
// Result
{
  "id":67,
  "jsonrpc":"2.0",
  "result": "Mist/v0.9.3/darwin/go1.4.1"
}

web3_sha3

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

Parameters

1. DATA - the data to convert into a SHA3 hash

params: ["0x68656c6c6f20776f726c64"]

Returns

DATA - The SHA3 result of the given string.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"web3_sha3","params":["0x68656c6c6f20776f726c64"],"id":64}'
// Result
{
  "id":64,
  "jsonrpc": "2.0",
  "result": "0x47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad"
}

net_version

Returns the current network id.

Parameters

None

Returns

String - The current network id.

The full list of current network IDs is available at chainlist.org↗. Some common ones are:

• 52014: Electroneum Smart Chain Mainnet

• 5201420: Electroneum Smart Chain Testnet

• 5201419: Electroneum Smart Chain Stagenet

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"net_version","params":[],"id":67}'
// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "3"
}

net_listening

Returns true if client is actively listening for network connections.

Parameters

None

Returns

Boolean - true when listening, otherwise false.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"net_listening","params":[],"id":67}'
// Result
{
  "id":67,
  "jsonrpc":"2.0",
  "result":true
}

net_peerCount

Returns number of peers currently connected to the client.

Parameters

None

Returns

QUANTITY - integer of the number of connected peers.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"net_peerCount","params":[],"id":74}'
// Result
{
  "id":74,
  "jsonrpc": "2.0",
  "result": "0x2" // 2
}

eth_syncing

Returns an object with data about the sync status or false.

Parameters

None

Returns

Object|Boolean, An object with sync status data or FALSE, when not syncing:

• startingBlock: QUANTITY - The block at which the import started (will only be reset, after the sync reached his head)

• currentBlock: QUANTITY - The current block, same as eth_blockNumber

• highestBlock: QUANTITY - The estimated highest block

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_syncing","params":[],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": {
    startingBlock: '0x384',
    currentBlock: '0x386',
    highestBlock: '0x454'
  }
}
// Or when not syncing
{
  "id":1,
  "jsonrpc": "2.0",
  "result": false
}

eth_coinbase

Returns the client coinbase address.

Parameters

None

Returns

DATA, 20 bytes - the current coinbase address.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_coinbase","params":[],"id":64}'
// Result
{
  "id":64,
  "jsonrpc": "2.0",
  "result": "0x407d73d8a49eeb85d32cf465507dd71d507100c1"
}

eth_chainId

Returns the chain ID used for signing replay-protected transactions.

Parameters

None

Returns

chainId, hexadecimal value as a string representing the integer of the current chain id.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":67}'
// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "0x1"
}

eth_mining

Returns true if client is actively mining new blocks.

Parameters

None

Returns

Boolean - returns true of the client is mining, otherwise false.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_mining","params":[],"id":71}'
//
{
  "id":71,
  "jsonrpc": "2.0",
  "result": true
}

eth_hashrate

Returns the number of hashes per second that the node is mining with. Not applicable to IBFT.

Parameters

None

Returns

QUANTITY - number of hashes per second.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_hashrate","params":[],"id":71}'
// Result
{
  "id":71,
  "jsonrpc": "2.0",
  "result": "0x38a"
}

eth_gasPrice

Returns the current price per gas in wei.

Parameters

None

Returns

QUANTITY - integer of the current gas price in wei.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_gasPrice","params":[],"id":73}'
// Result
{
  "id":73,
  "jsonrpc": "2.0",
  "result": "0x1dfd14000" // 8049999872 Wei
}

eth_accounts

Returns a list of addresses owned by client.

Parameters

None

Returns

Array of DATA, 20 Bytes - addresses owned by the client.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": ["0x407d73d8a49eeb85d32cf465507dd71d507100c1"]
}

eth_blockNumber

Returns the number of most recent block.

Parameters

None

Returns

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

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":83}'
// Result
{
  "id":83,
  "jsonrpc": "2.0",
  "result": "0x4b7" // 1207
}

eth_getBalance

Returns the balance of the account of given address.

Parameters

1. DATA, 20 Bytes - address to check for balance.

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

params: ["0x407d73d8a49eeb85d32cf465507dd71d507100c1", "latest"]

Returns

QUANTITY - integer of the current balance in wei.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0x407d73d8a49eeb85d32cf465507dd71d507100c1", "latest"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x0234c8a3397aab58" // 158972490234375000
}

eth_getStorageAt

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

Parameters

1. DATA, 20 Bytes - address of the storage.

2. QUANTITY - integer of the position in the storage.

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

Returns

DATA - the value at this storage position.

Example Calculating the correct position depends on the storage to retrieve. Consider the following contract deployed at 0x295a70b2de5e3953354a6a8344e616ed314d7251 by address 0x391694e7e0b0cce554cb130d723a9d27458f9298.

contract Storage {
    uint pos0;
    mapping(address => uint) pos1;
    function Storage() {
        pos0 = 1234;
        pos1[msg.sender] = 5678;
    }
}

Retrieving the value of pos0 is straight forward:

curl -X POST --data '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x0", "latest"], "id": 1}' localhost:8545
{"jsonrpc":"2.0","id":1,"result":"0x00000000000000000000000000000000000000000000000000000000000004d2"}

Retrieving an element of the map is harder. The position of an element in the map is calculated with:

keccack(LeftPad32(key, 0), LeftPad32(map position, 0))

This means to retrieve the storage on pos1["0x391694e7e0b0cce554cb130d723a9d27458f9298"] we need to calculate the position with:

keccak(
  decodeHex(
    "000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" +
      "0000000000000000000000000000000000000000000000000000000000000001"
  )
)

The etn-sc console which comes with the web3 library can be used to make the calculation:

> var key = "000000000000000000000000391694e7e0b0cce554cb130d723a9d27458f9298" + "0000000000000000000000000000000000000000000000000000000000000001"
undefined
> web3.sha3(key, {"encoding": "hex"})
"0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9"

Now to fetch the storage:

curl -X POST --data '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9", "latest"], "id": 1}' localhost:8545
{"jsonrpc":"2.0","id":1,"result":"0x000000000000000000000000000000000000000000000000000000000000162e"}

eth_getTransactionCount

Returns the number of transactions sent from an address.

Parameters

1. DATA, 20 Bytes - address.

2. 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 -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0x407d73d8a49eeb85d32cf465507dd71d507100c1","latest"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}

eth_getBlockTransactionCountByHash

Returns the number of transactions in a block from a block matching the given block hash.

Parameters

1. DATA, 32 Bytes - hash of a block

params: ["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"]

Returns

QUANTITY - integer of the number of transactions in this block.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByHash","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xb" // 11
}

eth_getBlockTransactionCountByNumber

Returns the number of transactions in a block matching the given block number.

Parameters

1. QUANTITY|TAG - integer of a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.

params: [
  "0xe8", // 232
]

Returns

QUANTITY - integer of the number of transactions in this block.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByNumber","params":["0xe8"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa" // 10
}

eth_getUncleCountByBlockHash

Returns the number of uncles in a block from a block matching the given block hash.

Parameters

1. DATA, 32 Bytes - hash of a block

params: ["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"]

Returns

QUANTITY - integer of the number of uncles in this block.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockHash","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}

eth_getUncleCountByBlockNumber

Returns the number of uncles in a block from a block matching the given block number.

Parameters

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

params: [
  "0xe8", // 232
]

Returns

QUANTITY - integer of the number of uncles in this block.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockNumber","params":["0xe8"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}

eth_getCode

Returns code at a given address.

Parameters

1. DATA, 20 Bytes - address

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

params: [
  "0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b",
  "0x2", // 2
]

Returns

DATA - the code from the given address.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getCode","params":["0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b", "0x2"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"
}

eth_sign

The sign method calculates an Ethereum specific signature with: sign(keccak256("\x19Electroneum Signed Message:\n" + len(message) + message))).

By adding a prefix to the message makes the calculated signature recognizable as an Electroneum specific signature. This prevents misuse where a malicious dapp can sign arbitrary data (e.g. transaction) and use the signature to impersonate the victim.

Note: the address to sign with must be unlocked.

Parameters

1. DATA, 20 Bytes - address

2. DATA, N Bytes - message to sign

Returns

DATA: Signature

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sign","params":["0x9b2055d370f73ec7d8a03e965129118dc8f5bf83", "0xdeadbeaf"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa3f20717a250c2b0b729b7e5becbff67fdaef7e0699da4de7ca5895b02a170a12d887fd3b17bfdce3481f10bea41f45ba9f709d39ce8325427b57afcfc994cee1b"
}

eth_signTransaction

Signs a transaction that can be submitted to the network at a later time using with eth_sendRawTransaction.

Parameters

1. Object - The transaction object

• from: DATA, 20 Bytes - The address the transaction is sent from.

• to: DATA, 20 Bytes - (optional when creating new contract) The address the transaction is directed to.

• gas: QUANTITY - (optional, default: 90000) Integer of the gas provided for the transaction execution. It will return unused gas.

• gasPrice: QUANTITY - (optional, default: To-Be-Determined) Integer of the gasPrice used for each paid gas, in Wei.

• value: QUANTITY - (optional) Integer of the value sent with this transaction, in Wei.

• data: DATA - The compiled code of a contract OR the hash of the invoked method signature and encoded parameters.

• nonce: QUANTITY - (optional) Integer of a nonce. This allows to overwrite your own pending transactions that use the same nonce.

Returns

DATA, The signed transaction object.

Example

// Request
curl -X POST --data '{"id": 1,"jsonrpc": "2.0","method": "eth_signTransaction","params": [{"data":"0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675","from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155","gas": "0x76c0","gasPrice": "0x9184e72a000","to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567","value": "0x9184e72a"}]}'
// Result
{
    "id": 1,
    "jsonrpc": "2.0",
    "result": "0xa3f20717a250c2b0b729b7e5becbff67fdaef7e0699da4de7ca5895b02a170a12d887fd3b17bfdce3481f10bea41f45ba9f709d39ce8325427b57afcfc994cee1b"
}

eth_sendTransaction

Creates new message call transaction or a contract creation, if the data field contains code.

Parameters

1. Object - The transaction object

• from: DATA, 20 Bytes - The address the transaction is sent from.

• to: DATA, 20 Bytes - (optional when creating new contract) The address the transaction is directed to.

• gas: QUANTITY - (optional, default: 90000) Integer of the gas provided for the transaction execution. It will return unused gas.

• gasPrice: QUANTITY - (optional, default: To-Be-Determined) Integer of the gasPrice used for each paid gas.

• value: QUANTITY - (optional) Integer of the value sent with this transaction.

• data: DATA - The compiled code of a contract OR the hash of the invoked method signature and encoded parameters.

• nonce: QUANTITY - (optional) Integer of a nonce. This allows to overwrite your own pending transactions that use the same nonce.

params: [
  {
    from: "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
    to: "0xd46e8dd67c5d32be8058bb8eb970870f07244567",
    gas: "0x76c0", // 30400
    gasPrice: "0x9184e72a000", // 10000000000000
    value: "0x9184e72a", // 2441406250
    data: "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 -X POST --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}

eth_sendRawTransaction

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

Parameters

1. 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 -X POST --data '{"jsonrpc":"2.0","method":"eth_sendRawTransaction","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}

eth_call

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

Parameters

1. 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. For details see Ethereum Contract ABI in the Solidity documentation↗

1. 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 -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "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 EVM mechanics and node performance.

Parameters

See eth_call parameters, except that all properties are optional. If no gas limit is specified etn-sc 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 -X POST --data '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x5208" // 21000
}

eth_getBlockByHash

Returns information about a block by hash.

Parameters

1. DATA, 32 Bytes - Hash of a block.

2. Boolean - If true it returns the full transaction objects, if false only the hashes of the transactions.

params: [
  "0xdc0818cf78f21a8e70579cb46a43643f78291264dda342ae31049421c82d21ae",
  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 - the address of the beneficiary to whom the mining rewards were given.

• difficulty: QUANTITY - integer of the difficulty for this block.

• totalDifficulty: QUANTITY - integer of the total difficulty of the chain until 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.

• uncles: Array - Array of uncle hashes.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByHash","params":["0xdc0818cf78f21a8e70579cb46a43643f78291264dda342ae31049421c82d21ae", false],"id":1}'
// Result
{
{
"jsonrpc": "2.0",
"id": 1,
"result": {
    "difficulty": "0x4ea3f27bc",
    "extraData": "0x476574682f4c5649562f76312e302e302f6c696e75782f676f312e342e32",
    "gasLimit": "0x1388",
    "gasUsed": "0x0",
    "hash": "0xdc0818cf78f21a8e70579cb46a43643f78291264dda342ae31049421c82d21ae",
    "logsBloom": "0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "miner": "0xbb7b8287f3f0a933474a79eae42cbca977791171",
    "mixHash": "0x4fffe9ae21f1c9e15207b1f472d5bbdd68c9595d461666602f2be20daf5e7843",
    "nonce": "0x689056015818adbe",
    "number": "0x1b4",
    "parentHash": "0xe99e022112df268087ea7eafaf4790497fd21dbeeb6bd7a1721df161a6657a54",
    "receiptsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
    "size": "0x220",
    "stateRoot": "0xddc8b0234c2e0cad087c8b389aa7ef01f7d79b2570bccb77ce48648aa61c904d",
    "timestamp": "0x55ba467c",
    "totalDifficulty": "0x78ed983323d",
    "transactions": [
    ],
    "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "uncles": [
    ]
}
}

eth_getBlockByNumber

Returns information about a block by block number.

Parameters

1. QUANTITY|TAG - integer of a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.

2. Boolean - If true it returns the full transaction objects, if false only the hashes of the transactions.

params: [
  "0x1b4", // 436
  true,
]

Returns See eth_getBlockByHash

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x1b4", true],"id":1}'

Result see eth_getBlockByHash

eth_getTransactionByHash

Returns the information about a transaction requested by transaction hash.

Parameters

1. DATA, 32 Bytes - hash of a transaction

params: ["0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b"]

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 Wei.

• 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 Wei.

• v: QUANTITY - ECDSA recovery id

• r: QUANTITY - ECDSA signature r

• s: QUANTITY - ECDSA signature s

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b"],"id":1}'
// Result
{
  "jsonrpc":"2.0",
  "id":1,
  "result":{
    "blockHash":"0x1d59ff54b1eb26b013ce3cb5fc9dab3705b415a67127a003c3e61eb445bb8df2",
    "blockNumber":"0x5daf3b", // 6139707
    "from":"0xa7d9ddbe1f17865597fbd27ec712455208b6b76d",
    "gas":"0xc350", // 50000
    "gasPrice":"0x4a817c800", // 20000000000
    "hash":"0x88df016429689c079f3b2f6ad39fa052532c56795b733da78a91ebe6a713944b",
    "input":"0x68656c6c6f21",
    "nonce":"0x15", // 21
    "to":"0xf02c1c8e6114b1dbe8937a39260b5b0a374432bb",
    "transactionIndex":"0x41", // 65
    "value":"0xf3dbb76162000", // 4290000000000000
    "v":"0x25", // 37
    "r":"0x1b5e176d927f8e9ab405058b2d2457392da3e20f328b16ddabcebc33eaac5fea",
    "s":"0x4ba69724e8f69de52f0125ad8b3c5c2cef33019bac3249e2c0a2192766d1721c"
  }
}

eth_getTransactionByBlockHashAndIndex

Returns information about a transaction by block hash and transaction index position.

Parameters

1. DATA, 32 Bytes - hash of a block.

2. QUANTITY - integer of the transaction index position.

params: [
  "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
  "0x0", // 0
]

Returns See eth_getTransactionByHash

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockHashAndIndex","params":["0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "0x0"],"id":1}'

Result see eth_getTransactionByHash

eth_getTransactionByBlockNumberAndIndex

Returns information about a transaction by block number and transaction index position.

Parameters

1. QUANTITY|TAG - a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.

2. QUANTITY - the transaction index position.

params: [
  "0x29c", // 668
  "0x0", // 0
]

Returns See eth_getTransactionByHash

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockNumberAndIndex","params":["0x29c", "0x0"],"id":1}'

Result see eth_getTransactionByHash

eth_getTransactionReceipt

Returns the receipt of a transaction by transaction hash.

Note That the receipt is not available for pending transactions.

Parameters

1. DATA, 32 Bytes - hash of a transaction

params: ["0x85d995eba9763907fdf35cd2034144dd9d53ce32cbec21349d4b12823c6860c5"]

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.

• effectiveGasPrice : QUANTITY - The sum of the base fee and tip paid per unit of gas.

• 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.

• type: QUANTITY - integer of the transaction type, 0x0 for legacy transactions, 0x1 for access list types, 0x2 for dynamic fees.

It also returns either :

• root : DATA 32 bytes of post-transaction stateroot (pre Byzantium)

• status: QUANTITY either 1 (success) or 0 (failure)

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0x85d995eba9763907fdf35cd2034144dd9d53ce32cbec21349d4b12823c6860c5"],"id":1}'
// Result
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "blockHash":
      "0xa957d47df264a31badc3ae823e10ac1d444b098d9b73d204c40426e57f47e8c3",
    "blockNumber": "0xeff35f",
    "contractAddress": null, // string of the address if it was created
    "cumulativeGasUsed": "0xa12515",
    "effectiveGasPrice": "0x5a9c688d4",
    "from": "0x6221a9c005f6e47eb398fd867784cacfdcfff4e7",
    "gasUsed": "0xb4c8",
    "logs": [{
      // logs as returned by getFilterLogs, etc.
    }],
    "logsBloom": "0x00...0", // 256 byte bloom filter
    "status": "0x1",
    "to": "0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2",
    "transactionHash":
      "0x85d995eba9763907fdf35cd2034144dd9d53ce32cbec21349d4b12823c6860c5",
    "transactionIndex": "0x66",
    "type": "0x2"
  }
}

eth_getUncleByBlockHashAndIndex

Returns information about a uncle of a block by hash and uncle index position.

Parameters

1. DATA, 32 Bytes - The hash of a block.

2. QUANTITY - The uncle's index position.

params: [
  "0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b",
  "0x0", // 0
]

Returns See eth_getBlockByHash

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleByBlockHashAndIndex","params":["0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "0x0"],"id":1}'

Result see eth_getBlockByHash

Note: An uncle doesn't contain individual transactions.

eth_getUncleByBlockNumberAndIndex

Returns information about a uncle of a block by number and uncle index position.

Parameters

1. QUANTITY|TAG - a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.

2. QUANTITY - the uncle's index position.

params: [
  "0x29c", // 668
  "0x0", // 0
]

Returns See eth_getBlockByHash

Note: An uncle doesn't contain individual transactions.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleByBlockNumberAndIndex","params":["0x29c", "0x0"],"id":1}'

Result see eth_getBlockByHash

eth_getCompilers

Returns a list of available compilers in the client.

Parameters None

Returns Array - Array of available compilers.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getCompilers","params":[],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": ["solidity", "lll", "serpent"]
}

eth_compileSolidity

Returns compiled solidity code.

Parameters

1. String - The source code.

params: [
  "contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }",
]

Returns DATA - The compiled source code.

Example

// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_compileSolidity","params":["contract test { function multiply(uint a) returns(uint d) {   return a * 7;   } }"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": <