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Ethereum Builder's Guide

Ethereum JSON RPC

Overview

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.

JavaScript API

To talk to an ethereum node from inside a JavaScript application use the web3.js library, which gives an convenient interface for the RPC methods. See the JavaScript API for more.

JSON-RPC Endpoint

Default JSON-RPC endpoints:

C++: http://localhost:8080
Go: http://localhost:8545
Go

You can start the HTTP JSON-RPC with the --rpc flag

geth --rpc

change the default port (8545) and listing address (localhost) with:

geth --rpc --rpcaddr <ip> --rpcport <portnumber>

If accessing the RPC from a browser, CORS will need to be enabled with the appropriate domain set. Otherwise, JavaScript calls are limit by the same-origin policy and requests will fail:

geth --rpc --rpccorsdomain "http://localhost:3000"

The JSON RPC can also be started from the geth console using the admin.startRPC(addr, port) command.

C++

You can start it by running eth application with -j option:

./eth -j

You can also specify JSON-RPC port (default is 8080):

./eth -j --json-rpc-port 8079

JSON-RPC support

cpp-ethereum go-ethereum
JSON-RPC 1.0 ✓
JSON-RPC 2.0 ✓ ✓
Batch requests ✓ ✓
HTTP ✓ ✓

Output HEX values

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)

Currently cpp-ethereum and go-ethereum provides JSON-RPC communication only over http.

The default block parameter

The following methods have a extra default block parameter:

When requests are made that act on the state of ethereum, 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 "latest" - for the latest minded block
  • String "earliest" for the earliest/genesis block
  • String "pending" - for the pending state/transactions

JSON-RPC methods

API

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 SHA3 of the given data.

Parameters
  1. String - 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 protocol version.

Parameters

none

Returns

String - The current network protocol version

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

// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "59"
}

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 currenly 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_protocolVersion

Returns the current ethereum protocol version.

Parameters

none

Returns

String - The current ethereum protocol version

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_protocolVersion","params":[],"id":67}'

// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "54"
}

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_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}'

// Result
{
  "id":71,
  "jsonrpc": "2.0",
  "result": true
}

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": "0x09184e72a000" // 10000000000000
}

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
params: [
   '0x407d73d8a49eeb85d32cf465507dd71d507100c1',
   '0x0', // storage position at 0
   '0x2' // state at block number 2
]
Returns

DATA - the value at this storage position.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getStorageAt","params":["0x407d73d8a49eeb85d32cf465507dd71d507100c1", "0x0", "0x2"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x03"
}

eth_getTransactionCount

Returns the number of transactions send from a 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 from a block matching the given block number.

Parameters
  1. QUANTITY - 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 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"Block: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 - 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_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 send from.
    • to: DATA, 20 Bytes - (optional when creating new contract) The address the transaction is directed to.
    • gas: QUANTITY - (optional, default: To-Be-Determined) 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 payed gas
    • value: QUANTITY - (optional) Integer of the value send with this transaction
    • data: DATA - (optional) The compiled code of a contract
params: [{
  "from": "0xb60e8dd61c5d32be8058bb8eb970870f07233155",
  "to": "0xd46e8dd67c5d32be8058bb8eb970870f072445675",
  "gas": "0x76c0", // 30400,
  "gasPrice": "0x9184e72a000", // 10000000000000
  "value": "0x9184e72a", // 2441406250
  "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"
}]
Returns

DATA, 20 Bytes - the address of the newly created contract, or the 32 Bytes transaction hash.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params":[{see above}],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x7f9fade1c0d57a7af66ab4ead7c2eb7b11a91385"
}

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 - The address the transaction is send from.
    • to: DATA, 20 Bytes - The address the transaction is directed to.
    • gas: QUANTITY - (optional) Integer of the gas provided for the transaction execution. It will return unused gas.
    • gasPrice: QUANTITY - (optional) Integer of the gasPrice used for each payed gas
    • value: QUANTITY - (optional) Integer of the value send with this transaction
    • data: DATA - (optional) The compiled code of a contract
  2. QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter

See: eth_sendTransaction Parameters

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": "0x0"
}

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: [
   '0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331',
   true
]
Returns

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

  • number: QUANTITY - the block number.
  • hash: DATA, 32 Bytes - hash of the block.
  • parentHash: DATA, 32 Bytes - hash of the parent block.
  • nonce: DATA, 8 Bytes - hash of the generated proof-of-work.
  • 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.
  • 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.
  • 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":["0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331", true],"id":1}'

// Result
{
"id":1,
"jsonrpc":"2.0",
"result": {
    "number": "0x1b4", // 436
    "hash": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
    "parentHash": "0x9646252be9520f6e71339a8df9c55e4d7619deeb018d2a3f2d21fc165dde5eb5",
    "nonce": "0xe04d296d2460cfb8472af2c5fd05b5a214109c25688d3704aed5484f9a7792f2",
    "sha3Uncles": "0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347",
    "logsBloom": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331",
    "transactionsRoot": "0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421",
    "stateRoot": "0xd5855eb08b3387c0af375e9cdb6acfc05eb8f519e419b874b6ff2ffda7ed1dff",
    "miner": "0x4e65fda2159562a496f9f3522f89122a3088497a",
    "difficulty": "0x027f07", // 163591
    "totalDifficulty":  "0x027f07", // 163591
    "extraData": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "size":  "0x027f07", // 163591
    "gasLimit": "0x9f759", // 653145
    "minGasPrice": "0x9f759", // 653145
    "gasUsed": "0x9f759", // 653145
    "timestamp": "0x54e34e8e" // 1424182926
    "transactions": [{...},{ ... }] 
    "uncles": ["0x1606e5...", "0xd5145a9..."]
  }
}

eth_getBlockByNumber

Returns information about a block by block number.

Parameters
  1. QUANTITY - integer of a block number.
  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: [
   "0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"
]
Returns

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

  • hash: DATA, 32 Bytes - hash of the transaction.
  • nonce: QUANTITY - the number of transactions made by the sender prior to this one.
  • blockHash: DATA, 32 Bytes - hash of the block where this transaction was in. null when the transaction is pending.
  • blockNumber: QUANTITY - block number where this transaction was in. null when the transaction is pending.
  • transactionIndex: QUANTITY - integer of the transactions index position in the block.
  • from: DATA, 20 Bytes - address of the sender.
  • to: DATA, 20 Bytes - address of the receiver. null when its a contract creation transaction.
  • value: QUANTITY - value transferred in Wei.
  • gasPrice: QUANTITY - price paid per gas in Wei.
  • gas: QUANTITY - gas used.
  • input: DATA - the data send along with the transaction.
Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":1}'

// Result
{
"id":1,
"jsonrpc":"2.0",
"result": {
    "hash":"0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b",
    "nonce":"0x",
    "blockHash": "0xbeab0aa2411b7ab17f30a99d3cb9c6ef2fc5426d6ad6fd9e2a26a6aed1d1055b",
    "blockNumber": "0x15df", // 5599
    "transactionIndex":  "0x1", // 1
    "from":"0x407d73d8a49eeb85d32cf465507dd71d507100c1",
    "to":"0x85h43d8a49eeb85d32cf465507dd71d507100c1",
    "value":"0x7f110" // 520464
    "gas": "0x7f110" // 520464
    "gasPrice":"0x09184e72a000",
    "input":"0x603880600c6000396000f300603880600c6000396000f3603880600c6000396000f360",
  }
}

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_getBlockByHash

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 - a block number.
  2. QUANTITY - the transaction index position.
params: [
   '0x29c', // 668
   '0x0' // 0
]
Returns

See eth_getBlockByHash

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

Result see eth_getTransactionByHash

eth_getUncleByBlockHashAndIndex

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

Parameters
  1. DATA, 32 Bytes - hash 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 - a block number.
  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": "0x603880600c6000396000f3006001600060e060020a600035048063c6888fa114601857005b6021600435602b565b8060005260206000f35b600081600702905091905056" // the compiled source code
}

eth_compileLLL

Returns compiled LLL code.

Parameters
  1. String - The source code.
params: [
   "(returnlll (suicide (caller)))",
]
Returns

DATA - The compiled source code.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_compileSolidity","params":["(returnlll (suicide (caller)))"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x603880600c6000396000f3006001600060e060020a600035048063c6888fa114601857005b6021600435602b565b8060005260206000f35b600081600702905091905056" // the compiled source code
}

eth_compileSerpent

Returns compiled serpent code.

Parameters
  1. String - The source code.
params: [
   "/* some serpent */",
]
Returns

DATA - The compiled source code.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_compileSolidity","params":["/* some serpent */"],"id":1}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x603880600c6000396000f3006001600060e060020a600035048063c6888fa114601857005b6021600435602b565b8060005260206000f35b600081600702905091905056" // the compiled source code
}

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.

Parameters
  1. 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.
params: [{
  "fromBlock": "0x1",
  "toBlock": "0x2",
  "address": "0x8888f1f195afa192cfee860698584c030f4c9db1",
  "topics": ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"]
}]
Returns

QUANTITY - A filter id.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_newFilter","params":[{"topics":["0x12341234"]}],"id":73}'

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

eth_newBlockFilter

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

Parameters
  1. TAG - The string "latest" for notifications about new block and "pending" for notifications about pending transactions.
params: ["pending"]
Returns

QUANTITY - A filter id.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_newBlockFilter","params":["pending"],"id":73}'

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

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
  1. QUANTITY - The filter id.
params: [
  "0xb" // 11
]
Returns

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

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_uninstallFilter","params":["0xb"],"id":73}'

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

eth_getFilterChanges

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

Parameters
  1. QUANTITY - the filter id.
params: [
  "0x16" // 22
]
Returns

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

For filters created with eth_newBlockFilter log objects are null.

For filters created with eth_newFilter logs are objects with following params:

  • logIndex: QUANTITY - integer of the log index position in the block.
  • transactionIndex: QUANTITY - integer of the transactions index position log was created from.
  • transactionHash: DATA, 32 Bytes - hash of the transactions this log was created from.
  • blockHash: DATA, 32 Bytes - hash of the block where this log was in. null when the log is pending.
  • blockNumber: QUANTITY - the block number where this log was in. null when the log is pending.
  • address: DATA, 32 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 DATA 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 -X POST --data '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0x16"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": [{
    "logIndex": "0x1", // 1
    "blockNumber":"0x1b4" // 436
    "blockHash": "0x8216c5785ac562ff41e2dcfdf5785ac562ff41e2dcfdf829c5a142f1fccd7d",
    "transactionHash":  "0xdf829c5a142f1fccd7d8216c5785ac562ff41e2dcfdf5785ac562ff41e2dcf",
    "transactionIndex": "0x0", // 0
    "address": "0x16c5785ac562ff41e2dcfdf829c5a142f1fccd7d",
    "data":"0x0000000000000000000000000000000000000000000000000000000000000000",
    "topics": ["0x59ebeb90bc63057b6515673c3ecf9438e5058bca0f92585014eced636878c9a5"]
    },{
      ...
    }]
}

eth_getFilterLogs

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

Parameters
  1. QUANTITY - The filter id.
params: [
  "0x16" // 22
]
Returns

See eth_getFilterChanges

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getFilterLogs","params":["0x16"],"id":74}'

Result see eth_getFilterChanges

eth_getLogs

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

Parameters
  1. Object - the filter object, see eth_newFilter parameters.
params: [{
  "topics": ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"]
}]
Returns

See eth_getFilterChanges

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getLogs","params":[{"topics":["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"]}],"id":74}'

Result see eth_getFilterChanges

eth_getWork

Returns the hash of the current block, the seedHash, and the boundary condition to be met ("target").

Parameters

none

Returns

Array - Array with the following properties:

  1. DATA, 32 Bytes - current block header pow-hash
  2. DATA, 32 Bytes - the seed hash used for the DAG.
  3. DATA, 32 Bytes - the boundary condition ("target"), 2^256 / difficulty.
Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getWork","params":[],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": [
      "0x1234567890abcdef1234567890abcdef",
      "0x5EED0000000000000000000000000000",
      "0xd1ff1c01710000000000000000000000"
    ]
}

eth_submitWork

Used for submitting a proof-of-work solution.

Parameters
  1. DATA, 8 Bytes - The nonce found (64 bits)
  2. DATA, 32 Bytes - The header's pow-hash (256 bits)
  3. DATA, 32 Bytes - The mix digest (256 bits)
params: [
  "0x0000000000000001",
  "0x1234567890abcdef1234567890abcdef",
  "0xD1FE5700000000000000000000000000"
]
Returns

Boolean - returns true if the provided solution is valid, otherwise false.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0", "method":"eth_submitWork", "params":["0x0000000000000001", "0x1234567890abcdef1234567890abcdef", "0xD1GE5700000000000000000000000000"],"id":73}'

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

db_putString

Stores a string in the local database.

Parameters
  1. String - Database name.
  2. String - Key name.
  3. String - String to store.
params: [
  "testDB",
  "myKey",
  "myString"
]
Returns

Boolean - returns true if the value was stored, otherwise false.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_putString","params":["testDB","myKey","myString"],"id":73}'

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

db_getString

Returns string from the local database.

Parameters
  1. String - Database name.
  2. String - Key name.
params: [
  "testDB",
  "myKey",
]
Returns

String - The previously stored string.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_getString","params":["testDB","myKey"],"id":73}'

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

db_putHex

Stores binary data in the local database.

Parameters
  1. String - Database name.
  2. String - Key name.
  3. DATA - The data to store.
params: [
  "testDB",
  "myKey",
  "0x68656c6c6f20776f726c64"
]
Returns

Boolean - returns true if the value was stored, otherwise false.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_putHex","params":["testDB","myKey","0x68656c6c6f20776f726c64"],"id":73}'

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

db_getHex

Returns binary data from the local database.

Parameters
  1. String - Database name.
  2. String - Key name.
params: [
  "testDB",
  "myKey",
]
Returns

DATA - The previously stored data.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_getHex","params":["testDB","myKey"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": "0x68656c6c6f20776f726c64"
}

shh_version

Returns the current whisper protocol version.

Parameters

none

Returns

String - The current whisper protocol version

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_version","params":[],"id":67}'

// Result
{
  "id":67,
  "jsonrpc": "2.0",
  "result": "2"
}

shh_post

Sends a whisper message.

Parameters
  1. Object - The whisper post object:
    • from: DATA, 60 Bytes - (optional) The identity of the sender.
    • to: DATA, 60 Bytes - (optional) The identity of the receiver. When present whisper will encrypt the message so that only the receiver can decrypt it.
    • topics: Array of DATA - Array of DATA topics, for the receiver to identify messages.
    • payload: DATA - The payload of the message.
    • priority: QUANTITY - The integer of the priority in a rang from ... (?).
    • ttl: QUANTITY - integer of the time to live in seconds.
params: [{
  from: "0x04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a03e245533f97284d442460f2998cd41858798ddfd4d661997d3940272b717b1",
  to: "0x3e245533f97284d442460f2998cd41858798ddf04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a0d4d661997d3940272b717b1",
  topics: ["0x776869737065722d636861742d636c69656e74", "0x4d5a695276454c39425154466b61693532"],
  payload: "0x7b2274797065223a226d6",
  priority: "0x64",
  ttl: "0x64",
}]
Returns

Boolean - returns true if the message was send, otherwise false.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"db_getString","params":[{"from":"0xc931d93e97ab07fe42d923478ba2465f2..","topics": ["0x68656c6c6f20776f726c64"],"payload":"0x68656c6c6f20776f726c64","ttl":0x64,"priority":0x64}],"id":73}'

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

shh_newIdentinty

Creates new whisper identity in the client.

Parameters

none

Returns

DATA, 60 Bytes - the address of the new identiy.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_newIdentinty","params":[],"id":73}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xc931d93e97ab07fe42d923478ba2465f283f440fd6cabea4dd7a2c807108f651b7135d1d6ca9007d5b68aa497e4619ac10aa3b27726e1863c1fd9b570d99bbaf"
}

shh_hasIdentity

Checks if the client hold the private keys for a given identity.

Parameters
  1. DATA, 60 Bytes - The identity address to check.
params: [
  "0x04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a03e245533f97284d442460f2998cd41858798ddfd4d661997d3940272b717b1"
]
Returns

Boolean - returns true if the client holds the privatekey for that identity, otherwise false.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_hasIdentity","params":["0x04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a03e245533f97284d442460f2998cd41858798ddfd4d661997d3940272b717b1"],"id":73}'

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

shh_newGroup

(?)

Parameters

none

Returns

DATA, 60 Bytes - the address of the new group. (?)

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_newIdentinty","params":[],"id":73}'

// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xc65f283f440fd6cabea4dd7a2c807108f651b7135d1d6ca90931d93e97ab07fe42d923478ba2407d5b68aa497e4619ac10aa3b27726e1863c1fd9b570d99bbaf"
}

shh_addToGroup

(?)

Parameters
  1. DATA, 60 Bytes - The identity address to add to a group (?).
params: [
  "0x04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a03e245533f97284d442460f2998cd41858798ddfd4d661997d3940272b717b1"
]
Returns

Boolean - returns true if the identity was successfully added to the group, otherwise false (?).

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_hasIdentity","params":["0x04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a03e245533f97284d442460f2998cd41858798ddfd4d661997d3940272b717b1"],"id":73}'

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

shh_newFilter

Creates filter to notify, when client receives whisper message matching the filter options.

Parameters
  1. Object - The filter options:
    • to: DATA, 60 Bytes - (optional) Identity of the receiver. When present it will try to decrypt any incoming message if the client holds the private key to this identity.
    • topics: Array of DATA - Array of DATA topics which the incoming message's topics should match. 
params: [{
   "topics": ['0x12341234bf4b564f'],
   "to": "0x04f96a5e25610293e42a73908e93ccc8c4d4dc0edcfa9fa872f50cb214e08ebf61a03e245533f97284d442460f2998cd41858798ddfd4d661997d3940272b717b1"
}]
Returns

QUANTITY - The newly created filter.

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_newFilter","params":[{"topics": ['0x12341234bf4b564f'],"to": "0x2341234bf4b2341234bf4b564f..."}],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": "0x7" // 7
}

shh_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 shh_getFilterChanges for a period of time.

Parameters
  1. QUANTITY - The filter id.
params: [
  "0x7" // 7
]
Returns

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

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_uninstallFilter","params":["0x7"],"id":73}'

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

shh_getFilterChanges

Polling method for whisper filters. Returns new messages since the last call of this method.

Note calling the shh_getMessages method, will reset the buffer for this method, so that you won't receive duplicate messages.

Parameters
  1. QUANTITY - The filter id.
params: [
  "0x7" // 7
]
Returns

Array - Array of messages received since last poll:

  • hash: DATA, 32 Bytes (?) - The hash of the message.
  • from: DATA, 60 Bytes - The sender of the message, if a sender was specified.
  • to: DATA, 60 Bytes - The receiver of the message, if a receiver was specified.
  • expiry: QUANTITY - Integer of the time in seconds when this message should expire (?).
  • ttl: QUANTITY - Integer of the time the message should float in the system in seconds (?).
  • sent: QUANTITY - Integer of the unix timestamp when the message was sent.
  • topics: Array of DATA - Array of DATA topics the message contained. You can use the following combinations:
    • [A, B] = A && B
    • [A, [B, C]] = A && (B || C)
    • [null, A, B] = ANYTHING && A && B null works as a wildcard
  • payload: DATA - The payload of the message.
  • workProved: QUANTITY - Integer of the work this message required before it was send (?).
Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_getFilterChanges","params":["0x7"],"id":73}'

// Result
{
  "id":1,
  "jsonrpc":"2.0",
  "result": [{
    "hash": "0x33eb2da77bf3527e28f8bf493650b1879b08c4f2a362beae4ba2f71bafcd91f9",
    "from": "0x3ec052fc33..",
    "to": "0x87gdf76g8d7fgdfg...",
    "expiry": "0x54caa50a", // 1422566666
    "sent": "0x54ca9ea2", // 1422565026
    "ttl": "0x64" // 100
    "topics": ["0x6578616d"],
    "payload": "0x7b2274797065223a226d657373616765222c2263686...",
    "workProved": "0x0"
    }]
}

shh_getMessages

Get all messages matching a filter, which are still existing in the node's buffer.

Note calling this method, will also reset the buffer for the shh_getFilterChanges method, so that you won't receive duplicate messages.

Parameters
  1. QUANTITY - The filter id.
params: [
  "0x7" // 7
]
Returns

See shh_getFilterChanges

Example
// Request
curl -X POST --data '{"jsonrpc":"2.0","method":"shh_getMessages","params":["0x7"],"id":73}'

Result see shh_getFilterChanges