Alchemy API

Enterprise Grade API for Ethereum

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Alchemy API Reference

A faster, more reliable way to use Ethereum, built around the Ethereum JSON RPC so you can start using it easily too.

eth_blockNumber

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":83}'
// Result
{
  "id":83,
  "jsonrpc": "2.0",
  "result": "0xc94" // 1207
}

Returns the number of most recent block.

Parameters

none

Returns

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

eth_gasPrice

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_gasPrice","params":[],"id":73}'
// Result
{
  "id":73,
  "jsonrpc": "2.0",
  "result": "0x09184e72a000" // 10000000000000
}

Returns the current price per gas in wei.

Parameters

none

Returns

QUANTITY - integer of the current gas price in wei.

eth_getBalance

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f", "latest"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x0234c8a3397aab58" // 158972490234375000
}

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: ['0xc94770007dda54cF92009BFF0dE90c06F603a09f','latest']

Returns

QUANTITY - integer of the current balance in wei.

eth_getBlockByHash

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"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
    "gasUsed": "0x9f759", // 653145
    "timestamp": "0x54e34e8e" // 1424182926
    "transactions": [{...},{ ... }]
    "uncles": ["0x1606e5...", "0xd5145a9..."]
  }
}

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: ['0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331',true]

Returns

Object - A block object with the following fields, 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.

eth_getBlockByNumber

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x1b4", 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
    "gasUsed": "0x9f759", // 653145
    "timestamp": "0x54e34e8e" // 1424182926
    "transactions": [{...},{ ... }]
    "uncles": ["0x1606e5...", "0xd5145a9..."]
  }
}

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: ['0x1b4', true]

Returns

See eth_getBlockByHash

eth_getTransactionReceipt

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":1}
// Result
{
"id":1,
"jsonrpc":"2.0",
"result": {
     "transactionHash": "0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238",
     "transactionIndex":  "0x1", // 1
     "blockNumber": "0xb", // 11
     "blockHash": "0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b",
     "cumulativeGasUsed": "0x33bc", // 13244
     "gasUsed": "0x4dc", // 1244
     "contractAddress": "0xb60e8dd61c5d32be8058bb8eb970870f07233155", // or null, if none was created
     "logs": [{
         // logs as returned by getFilterLogs, etc.
     }, ...],
     "logsBloom": "0x00...0", // 256 byte bloom filter
     "status": "0x1"
  }
}

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
params: [ '0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238' ]

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.

It also returns either:

  • root : DATA 32 bytes of post-transaction stateroot (pre Byzantium)
  • status: QUANTITY either 1 (success) or 0 (failure)

eth_getBlockTransactionCountByHash

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByHash","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xc" // 11
}

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

Parameters

  • DATA, 32 Bytes - hash of a block.
    params: [ '0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238' ]

Returns

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

eth_getBlockTransactionCountByNumber

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByNumber","params":["0xe8"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xa" // 10
}

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

Parameters

  • 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.

eth_getCode

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getCode","params":["0xa94f5374fce5edbc8e2a8697c15331677e6ebf0b", "0x2"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x600160008035811a818181146012578301005b601b6001356025565b8060005260206000f25b600060078202905091905056"
}

Returns code at a given address.

Parameters

  • DATA, 20 Bytes - address.
  • 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.

eth_getLogs


# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getLogs","params":[{"topics":["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"]}],"id":74}'

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) With the addition of EIP-234 (Geth >= v1.8.13 or Parity >= v2.1.0), blockHash is 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 the filter criteria, then neither fromBlock nor toBlock are allowed.
    params: [{ "topics": ["0x000000000000000000000000a94f5374fce5edbc8e2a8697c15331677e6ebf0b"] }]

Returns

See eth_getTransactionReceipt

eth_getStorageAt

// 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:
# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"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 geth 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 https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0", "method": "eth_getStorageAt", "params": ["0x295a70b2de5e3953354a6a8344e616ed314d7251", "0x6661e9d6d8b923d5bbaab1b96e1dd51ff6ea2a93520fdc9eb75d059238b8c5e9", "latest"], "id": 1}' localhost:8545
{"jsonrpc":"2.0","id":1,"result":"0x000000000000000000000000000000000000000000000000000000000000162e"}

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

Returns

  • DATA - the value at this storage position.

eth_getTransactionByBlockHashAndIndex

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockHashAndIndex","params":["0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "0x0"],"id":1}'

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

Parameters

DATA, 32 Bytes - hash of a block.
QUANTITY - integer of the transaction index position.
params: [
'0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331',
'0x0' // 0
]

Returns

See eth_getTransactionByHash

Result see eth_getTransactionByHash

eth_getTransactionByBlockNumberAndIndex

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockNumberAndIndex","params":["0x29c", "0x0"],"id":1}'

Result see eth_getTransactionByHash

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

Parameters

QUANTITY|TAG - a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.
QUANTITY - the transaction index position.
params: [
'0x29c', // 668
'0x0' // 0
]

Returns

See eth_getTransactionByHash

eth_getUncleByBlockNumberAndIndex

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getUncleByBlockNumberAndIndex","params":["0x29c", "0x0"],"id":1}'

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

Parameters

  • QUANTITY|TAG - a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.
  • QUANTITY - the uncle's index position.
    params: [ '0x29c', // 668 '0x0' // 0 ]

Returns

See eth_getBlockByHash
Note: An uncle doesn't contain individual transactions.

eth_getUncleByBlockHashAndIndex

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getUncleByBlockHashAndIndex","params":["0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b", "0x0"],"id":1}'

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

Parameters

  • QUANTITY|TAG - a block number, or the string "earliest", "latest" or "pending", as in the default block parameter.
  • QUANTITY - the uncle's index position.
    params: [ '0xc6ef2fc5426d6ad6fd9e2a26abeab0aa2411b7ab17f30a99d3cb96aed1d1055b', '0x0' // 0 ]

Returns

See eth_getBlockByHash
Note: An uncle doesn't contain individual transactions.

eth_getUncleCountByBlockHash

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockHash","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xc" // 1
}

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

Parameters

  • DATA, 32 Bytes - hash of a block.
    params: [ '0xc94770007dda54cF92009BFF0dE90c06F603a09f' ]

Returns

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

eth_getUncleCountByBlockNumber

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockNumber","params":["0xe8"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}

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

Parameters

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.

eth_protocolVersion

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_protocolVersion","params":[],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "63"
}

Returns the current ethereum protocol version.

Parameters

none

Returns

String - The current ethereum protocol version.

eth_getTransactionByHash

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d'{"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"
  }
}

Returns the information about a transaction requested by transaction hash.

Parameters

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: DATA, 32 Bytes - ECDSA signature r
  • s: DATA, 32 Bytes - ECDSA signature s

eth_getTransactionCount

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f","latest"],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x1" // 1
}

Returns the number of transactions sent from an address.

Parameters

  • DATA, 20 Bytes - address.
  • QUANTITY|TAG - integer block number, or the string "latest", "earliest" or "pending", see the default block parameter
    params: [ '0xc94770007dda54cF92009BFF0dE90c06F603a09f', 'latest' // state at the latest block ]

Returns

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

eth_call

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_call","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x"
}

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. For details see Ethereum Contract ABI
  • 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.

eth_estimateGas

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0x5208" // 21000
}

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 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.

eth_sendRawTransaction

# Request
curl https://eth-mainnet.alchemyapi.io/jsonrpc/your-api-key \
-X POST \
-H "Content-Type: application/json" \
-d '{"jsonrpc":"2.0","method":"eth_sendRawTransaction","params":[{see above}],"id":1}'
// Result
{
  "id":1,
  "jsonrpc": "2.0",
  "result": "0xe670ec64341771606e55d6b4ca35a1a6b75ee3d5145a99d05921026d1527331"
}

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.

Updated 6 months ago

Alchemy API Reference


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