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Besu API methods

caution
  • This reference contains API methods that apply to both public and private networks. For private-network-specific API methods, see the private network API reference.
  • All JSON-RPC HTTP examples use the default host and port endpoint http://127.0.0.1:8545. If using the --rpc-http-host or --rpc-http-port options, update the endpoint.
  • Most example requests are made against private networks. Depending on network configuration and activity, your example results might be different.
Besu JSON-RPC APIs documentation in Postman format

View the Besu JSON-RPC APIs documentation in the Postman format and obtain example requests in multiple coding languages.

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Alternatively you can download the JSON collection file.

ADMIN methods​

The ADMIN API methods provide administrative functionality to manage your node.

note

The ADMIN API methods are not enabled by default for JSON-RPC. To enable the ADMIN API methods, use the --rpc-http-api or --rpc-ws-api options.

admin_addPeer​

Adds a static node.

caution

If connections are timing out, ensure the node ID in the enode URL is correct.

Parameters​

enode: string - enode URL of peer to add

Returns​

result: boolean - true if peer added or false if peer already a static node

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_addPeer","params":["enode://f59c0ab603377b6ec88b89d5bb41b98fc385030ab1e4b03752db6f7dab364559d92c757c13116ae6408d2d33f0138e7812eb8b696b2a22fe3332c4b5127b22a3@127.0.0.1:30304"],"id":1}' http://127.0.0.1:8545

admin_changeLogLevel​

Changes the log level without restarting Besu. You can change the log level for all logs, or you can change the log level for specific packages or classes.

You can specify only one log level per RPC call.

Parameters​

  • level: string - log level

  • log_filter: array - (optional) packages or classes for which to change the log level

Returns​

result: string - Success if the log level has changed, otherwise error

The following example changes the debug level for specified classes to DEBUG.

curl -X POST --data '{"jsonrpc":"2.0", "method":"admin_changeLogLevel", "params":["DEBUG", ["org.hyperledger.besu.ethereum.eth.manager","org.hyperledger.besu.ethereum.p2p.rlpx.connections.netty.ApiHandler"]], "id":1}' http://127.0.0.1:8545

The following example changes the debug level of all logs to WARN.

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_changeLogLevel","params":["WARN"], "id":1}' http://127.0.0.1:8545

admin_generateLogBloomCache​

Generates cached log bloom indexes for blocks. APIs such as eth_getLogs and eth_getFilterLogs use the cache for improved performance.

tip

Manually executing admin_generateLogBloomCache is not required unless the --auto-log-bloom-caching-enabled command line option is set to false.

note

Each index file contains 100000 blocks. The last fragment of blocks less than 100000 are not indexed.

Parameters​

  • startBlock: string - block to start generating indexes

  • endBlock: string - block to stop generating indexes

Returns​

result: object - log bloom index details:

  • startBlock: string - starting block for the last requested cache generation

  • endBlock: string - ending block for the last requested cache generation

  • currentBlock: string - most recent block added to the cache

  • indexing: boolean - indicates if indexing is in progress

  • boolean - indicates acceptance of the request from this call to generate the cache

curl -X POST --data '{jsonrpc":"2.0","method":"admin_generateLogBloomCache", "params":["0x0", "0x10000"], "id":1}' http://127.0.0.1:8545

admin_logsRemoveCache​

Removes cache files for the specified range of blocks.

Parameters​

  • fromBlock: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

  • toBlock: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

You can skip a parameter by using an empty string, "". If you specify:

  • No parameters, the call removes cache files for all blocks.

  • Only fromBlock, the call removes cache files for the specified block.

  • Only toBlock, the call removes cache files from the genesis block to the specified block.

Returns​

result: object - Cache Removed status or error.

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_logsRemoveCache","params":["1", "100"], "id":1}' http://127.0.0.1:8545

admin_logsRepairCache​

Repairs cached logs by fixing all segments starting with the specified block number.

Parameters​

startBlock: string - decimal index of the starting block to fix; defaults to the head block

Returns​

result: object - status of the repair request; Started or Already running

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_logsRepairCache","params":["1200"], "id":1}' http://127.0.0.1:8545

admin_nodeInfo​

Returns networking information about the node. The information includes general information about the node and specific information from each running Ethereum sub-protocol (for example, eth).

Parameters​

None

Returns​

result: object - node object with the following fields:

  • enode: string - enode URL of the node

  • listenAddr: string - host and port for the node

  • name: string - client name

  • id: string - node public key

  • ports: object - peer discovery and listening ports

  • protocols: object - list of objects containing information for each Ethereum sub-protocol

note

If the node is running locally, the host of the enode and listenAddr display as [::] in the result. When advertising externally, the external address displayed for the enode and listenAddr is defined by --nat-method.

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_nodeInfo","params":[],"id":1}' http://127.0.0.1:8545

admin_peers​

Returns networking information about connected remote nodes.

Parameters​

None

Returns​

result: array of objects - list of objects returned for each remote node, with the following fields.

  • version: string - P2P protocol version

  • name: string - client name

  • caps: array of strings - list of Ethereum sub-protocol capabilities

  • network: object - local and remote addresses established at time of bonding with the peer (the remote address might not match the hex value for port; it depends on which node initiated the connection.)

  • port: string - port on the remote node on which P2P discovery is listening

  • id: string - node public key (excluding the 0x prefix, the node public key is the ID in the enode URL enode://<id ex 0x>@<host>:<port>.)

  • protocols: object - current state of peer including difficulty and head (head is the hash of the highest known block for the peer.)

  • enode: string - enode URL of the remote node

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_peers","params":[],"id":1}' http://127.0.0.1:8545

admin_removePeer​

Removes a static node.

Parameters​

enode: string - enode URL of peer to remove

Returns​

result: boolean - true if peer removed or false if peer not a static node

curl -X POST --data '{"jsonrpc":"2.0","method":"admin_removePeer","params":["enode://f59c0ab603377b6ec88b89d5bb41b98fc385030ab1e4b03752db6f7dab364559d92c757c13116ae6408d2d33f0138e7812eb8b696b2a22fe3332c4b5127b22a3@127.0.0.1:30304"],"id":1}' http://127.0.0.1:8545

DEBUG methods​

The DEBUG API methods allow you to inspect and debug the network. The DEBUG API is a more verbose alternative to the TRACE API, and its main purpose is compatibility with tools such as Remix. Where these APIs overlap, we recommend using the TRACE API for production use over the DEBUG API. Specifically, we recommend trace_block over debug_traceBlock, and trace_transaction over debug_traceTransaction.

note

The DEBUG API methods are not enabled by default for JSON-RPC. To enable the DEBUG API methods, use the --rpc-http-api or --rpc-ws-api options.

debug_accountAt​

Returns account information at the specified index of the specified block.

Parameters​

  • blockHashOrNumber: string - block hash or number at which to retrieve account information

  • txIndex: number - transaction index at which to retrieve account information

  • address: string - contract or account address for which to retrieve information

Returns​

result: object - account details object with the following fields:

  • code: data - code for the account. Displays 0x0 if the address is an externally owned account.

  • nonce: quantity - number of transactions made by the account before this one

  • balance: quantity - balance of the account in Wei

  • codehash: data - code hash for the account

This example uses an externally owned account address for the address parameter.

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_accountAt","params":["0xc8df1f061abb4d0c107b2b1a794ade8780b3120e681f723fe55a7be586d95ba6", 0, "0xbcde5374fce5edbc8e2a8697c15331677e6ebf0b"],"id":1}' http://127.0.0.1:8545

This example uses a contract address for the address parameter.

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_accountAt","params":["0x2b76b3a2fc44c0e21ea183d06c846353279a7acf12abcc6fb9d5e8fb14ae2f8c", 0, "0x0e0d2c8f7794e82164f11798276a188147fbd415"],"id":1}' http://127.0.0.1:8545

debug_accountRange​

Retesteth uses debug_accountRange to implement debugging.

Returns the accounts for a specified block.

Parameters​

  • blockHashOrNumber: string - block hash or number at which to retrieve account information

  • txIndex: number - transaction index at which to retrieve account information

  • address: string - address hash from which to start

  • limit: integer - maximum number of account entries to return

Returns​

result: object - account details object with the following fields:

  • addressMap: map of strings to strings - map of address hashes and account addresses

  • nextKey: string - hash of the next address if any addresses remain in the state, otherwise zero

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_accountRange","params":["12345", 0, "0", 5],"id":1}' http://127.0.0.1:8545

debug_batchSendRawTransaction​

Sends a list of signed transactions. This is used to quickly load a network with a lot of transactions. This does the same thing as calling eth_sendRawTransaction multiple times.

Parameters​

data: string - signed transaction data array

Returns​

result: array of objects - object returned for each transaction, with the following fields:

  • index: string - index of the transaction in the request parameters array

  • success: boolean - indicates whether or not the transaction has been added to the transaction pool

  • errorMessage: string - (optional) error message

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_batchSendRawTransaction","params":["0xf868808203e882520894627306090abab3a6e1400e9345bc60c78a8bef57872386f26fc10000801ba0ac74ecfa0e9b85785f042c143ead4780931234cc9a032fce99fab1f45e0d90faa02fd17e8eb433d4ca47727653232045d4f81322619c0852d3fe8ddcfcedb66a43","0x416","0xf868018203e882520894627306090abab3a6e1400e9345bc60c78a8bef57872386f26fc10000801ca0b24ea1bee8fe36984c36acbf80979a4509f23fc17141851e08d505c0df158aa0a00472a05903d4cd7a811bd4d5c59cc105d93f5943f3393f253e92e65fc36e7ce0","0xf868808203e882520894627306090abab3a6e1400e9345bc60c78a8bef5787470de4df820000801ca0f7936b4de04792e3c65095cfbfd1399d231368f5f05f877588c0c8509f6c98c9a01834004dead527c8da1396eede42e1c60e41f38a77c2fd13a6e495479c729b99"],"id":1}' http://127.0.0.1:8545

debug_getBadBlocks​

Returns a list of invalid blocks. This is used to detect and analyze consensus flaws.

Parameters​

None

Returns​

result: array of objects - list of block objects

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_getBadBlocks","params":[],"id":1}' http://127.0.0.1:8545

debug_getRawBlock​

Returns the RLP encoding of the specified block.

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: object - RLP-encoded block object

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_getRawBlock","params":["0x32026E"],"id":1}' http://127.0.0.1:8545

debug_getRawHeader​

Returns the RLP encoding of the header of specified block.

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: string - RLP-encoded block header or error

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_getRawHeader","params":["0x32026E"],"id":1}' http://127.0.0.1:8545

debug_metrics​

Returns metrics providing information on the internal operation of Besu.

The available metrics might change over time. The JVM metrics might vary based on the JVM implementation used.

The metric types are:

  • Timer

  • Counter

  • Gauge

Parameters​

None

Returns​

result: object - metrics object

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_metrics","params":[],"id":1}' http://127.0.0.1:8545

debug_replayBlock​

Re-imports the block matching the specified block number, by rolling the head of the local chain back to the block right before the specified block, then importing the specified block.

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: string - Success or error

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_replayBlock","params":["0x1"],"id":1}' http://127.0.0.1:8545

debug_resyncWorldstate​

Triggers a re-synchronization of the world state while retaining imported blocks. This is useful if there are world state database inconsistencies (for example, Bonsai database issues).

Parameters​

None

Returns​

result: string - Success or error

    curl -X POST --data '{"jsonrpc":"2.0","method":"debug_resyncWorldstate","params":[],"id":1}' http://127.0.0.1:8545

debug_setHead​

Sets the current head of the local chain to the block matching the specified block number.

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: string - Success or error

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_setHead","params":["0x1"],"id":1}' http://127.0.0.1:8545

debug_standardTraceBlockToFile​

Generates files containing the block trace. A separate file is generated for each transaction in the block.

You can also specify a trace file for a specific transaction in a block.

Use debug_standardTraceBadBlockToFile to view the trace for an invalid block.

Parameters​

blockHash: string - block hash

txHash: string - (optional) transaction hash; if omitted, a trace file is generated for each transaction in the block.

disableMemory: boolean - (optional) specifies whether to capture EVM memory during the trace; defaults to true

Returns​

result: string - location of the generated trace files

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_standardTraceBlockToFile","params":["0x2dc0b6c43144e314a86777b4bd4f987c0790a6a0b21560671d221ed81a23f2dc", {
"txHash": "0x4ff04c4aec9517721179c8dd435f47fbbfc2ed26cd4926845ab687420d5580a6", "disableMemory": false}], "id":1}' http://127.0.0.1:8545

debug_standardTraceBadBlockToFile​

Generates files containing the block trace of invalid blocks. A separate file is generated for each transaction in the block.

Use debug_standardTraceBlockToFile to view the trace for a valid block.

Parameters​

blockHash: string - block hash

Returns​

result: string - location of the generated trace files

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_standardTraceBadBlockToFile","params":["0x53741e9e94791466d117c5f9e41a2ed1de3f73d39920c621dfc2f294e7779baa"], "id":1}' http://127.0.0.1:8545

debug_storageRangeAt​

Remix uses debug_storageRangeAt to implement debugging. Use the Debugger tab in Remix instead of calling debug_storageRangeAt directly.

Returns the contract storage for the specified range.

Parameters​

  • blockHash: string - block hash

  • txIndex: number - transaction index from which to start

  • address: string - contract address

  • startKey: string - start key

  • limit: number - number of storage entries to return

Returns​

result: object - range object.

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_storageRangeAt","params":["0x2b76b3a2fc44c0e21ea183d06c846353279a7acf12abcc6fb9d5e8fb14ae2f8c",0,"0x0e0d2c8f7794e82164f11798276a188147fbd415","0x0000000000000000000000000000000000000000000000000000000000000000",1], "id":1}' http://127.0.0.1:8545

debug_traceBlock​

Returns full trace of all invoked opcodes of all transactions included in the block.

Parameters​

  • block: string - RLP of the block

  • options: object - request options object with the following fields (all optional and default to false):

    • disableStorage: boolean - true disables storage capture.

    • disableMemory: boolean - true disables memory capture.

    • disableStack : boolean - true disables stack capture.

Returns​

result: object - trace object

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_traceBlock","params":["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"],"id":1}' http://127.0.0.1:8545

debug_traceBlockByHash​

Returns full trace of all invoked opcodes of all transactions included in the block.

Parameters​

  • blockHash: string - block hash

  • options: object - request options object with the following fields (all optional and default to false):

    • disableStorage: boolean - true disables storage capture.

    • disableMemory: boolean - true disables memory capture.

    • disableStack : boolean - true disables stack capture.

Returns​

result: array of objects - list of trace objects

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_traceBlockByHash","params":["0xaceb3b2c9b25b0589230873921eb894b28722011b8df63977145517d754875a5"], "id":1}' http://127.0.0.1:8545

debug_traceBlockByNumber​

Returns full trace of all invoked opcodes of all transactions included in the block.

Parameters​

  • blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

  • options: object - request options object with the following fields (all optional and default to false):

    • disableStorage: boolean - true disables storage capture.

    • disableMemory: boolean - true disables memory capture.

    • disableStack : boolean - true disables stack capture.

Returns​

result: array of objects - list of trace objects

curl -X POST --data '{"jsonrpc":"2.0","method":"debug_traceBlockByNumber","params":["0x7224",{"disableStorage":true}], "id":1}' http://127.0.0.1:8545

ETH methods​

The ETH API methods allow you to interact with the blockchain.

note

Methods with an equivalent GraphQL query include a GraphQL request and result in the method example. The parameter and result descriptions apply to the JSON-RPC requests. The GraphQL specification is defined in the schema.

eth_accounts​

Returns a list of account addresses a client owns.

note

This method returns an empty object because Besu doesn't support key management inside the client.

To provide access to your key store and and then sign transactions, use EthSigner with Besu.

Parameters​

None

Returns​

result: array of strings - list of 20-byte account addresses owned by the client

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":53}' http://127.0.0.1:8545

eth_blockNumber​

Returns the index corresponding to the block number of the current chain head.

Parameters​

None

Returns​

result: string - hexadecimal integer representing the index corresponding to the block number of the current chain head

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":51}' http://127.0.0.1:8545

eth_call​

Invokes a contract function locally and does not change the state of the blockchain.

You can interact with contracts using eth_sendRawTransaction or eth_call.

By default, the eth_call error response includes the revert reason.

Parameters​

call: object - transaction call object

blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter

note

By default, eth_call does not fail if the sender account has an insufficient balance. This is done by setting the balance of the account to a large amount of ether. To enforce balance rules, set the strict parameter in the transaction call object to true.

Returns​

result: string - return value of the executed contract

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"to":"0x69498dd54bd25aa0c886cf1f8b8ae0856d55ff13","value":"0x1"}, "latest"],"id":53}' http://127.0.0.1:8545
Example of a simulated contract creation

The following example creates a simulated contract by not including the to parameter from the transaction call object in the call parameter. Besu simulates the data to create the contract.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_call","params":[{"from":"0xfe3b557e8fb62b89f4916b721be55ceb828dbd73", "data":"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","gas":"0x439cf","gasPrice":"0x0"},"latest"],"id":53}' http://127.0.0.1:8545

eth_chainId​

Returns the chain ID.

Parameters​

None

Returns​

result: string - chain ID in hexadecimal

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":51}' http://127.0.0.1:8545

eth_coinbase​

Returns the client coinbase address. The coinbase address is the account to pay mining rewards to.

To set a coinbase address, start Besu with the --miner-coinbase option set to a valid Ethereum account address. You can get the Ethereum account address from a client such as MetaMask or Etherscan. For example:

Example
besu --miner-coinbase="0xfe3b557e8fb62b89f4916b721be55ceb828dbd73" --rpc-http-enabled

Parameters​

None

Returns​

result: string - coinbase address

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_coinbase","params":[],"id":53}' http://127.0.0.1:8545

eth_createAccessList​

Creates an EIP-2930 access list that you can include in a transaction.

Parameters​

transaction: object - transaction call object

blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter.

Returns​

result: object - access list object with the following fields:

  • accessList: array of objects - list of objects with the following fields:
    • address: string - addresses to be accessed by the transaction
    • storageKeys: array - storage keys to be accessed by the transaction
  • gasUsed: string - approximate gas cost for the transaction if the access list is included
curl -X POST --data '{"method":"eth_createAccessList","params":[{"from": "0xaeA8F8f781326bfE6A7683C2BD48Dd6AA4d3Ba63", "data": "0x608060806080608155"}, "pending"],"id":1,"jsonrpc":"2.0"}' http://127.0.0.1:8545

eth_estimateGas​

Returns an estimate of the gas required for a transaction to complete. The estimation process does not use gas and the transaction is not added to the blockchain. The resulting estimate can be greater than the amount of gas the transaction ends up using, for reasons including EVM mechanics and node performance.

The eth_estimateGas call does not send a transaction. You must call eth_sendRawTransaction to execute the transaction.

By default, the eth_estimateGas error response includes the revert reason.

Parameters​

For eth_estimateGas, all fields are optional because setting a gas limit is irrelevant to the estimation process (unlike transactions, in which gas limits apply).

call: object - transaction call object

Returns​

result: string - amount of gas used

The following example returns an estimate of 21000 wei (0x5208) for the transaction.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_estimateGas","params":[{"from":"0xFE3B557E8Fb62b89F4916B721be55cEb828dBd73","to":"0x44Aa93095D6749A706051658B970b941c72c1D53","value":"0x1"}],"id":53}' http://127.0.0.1:8545

The following example request estimates the cost of deploying a simple storage smart contract to the network. The data field contains the hash of the compiled contract you want to deploy. (You can get the compiled contract hash from your IDE, for example, Remix > Compile tab > details > WEB3DEPLOY.) The result is 113355 wei.

curl -X POST \
http://127.0.0.1:8545 \
-H 'Content-Type: application/json' \
-d '{
  "jsonrpc": "2.0",
  "method": "eth_estimateGas",
  "params": [{
    "from": "0x8bad598904ec5d93d07e204a366d084a80c7694e",
    "data": "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"
  }],
  "id": 1
}'

eth_feeHistory​

Returns base fee per gas and transaction effective priority fee per gas history for the requested block range, allowing you to track trends over time.

Parameters​

  • blockCount: integer or string - Number of blocks in the requested range. Between 1 and 1024 blocks can be requested in a single query. If blocks in the specified block range are not available, then only the fee history for available blocks is returned. Accepts hexadecimal or integer values.

  • newestBlock: string - Integer representing the highest number block of the requested range or one of the string tags latest, earliest, or pending, as described in block parameter.

  • array of integers - (optional) A monotonically increasing list of percentile values to sample from each block's effective priority fees per gas in ascending order, weighted by gas used.

Returns​

result: object - Fee history results object.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_feeHistory","params": ["0x5", "latest", [20,30]],"id":1}' http://127.0.0.1:8545

eth_gasPrice​

Returns a percentile gas unit price for the most recent blocks, in Wei. By default, the last 100 blocks are examined and the 50th percentile gas unit price (that is, the median value) is returned.

If there are no blocks, the value for --min-gas-price is returned. The value returned is restricted to values between --min-gas-price and --api-gas-price-max. By default, 1000 Wei and 500GWei.

Use the --api-gas-price-blocks, --api-gas-price-percentile , and --api-gas-price-max command line options to configure the eth_gasPrice default values.

Parameters​

None

Returns​

result: string - percentile gas unit price for the most recent blocks, in Wei, as a hexadecimal value

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_gasPrice","params":[],"id":53}' http://127.0.0.1:8545

eth_getBalance​

Returns the account balance of the specified address.

Parameters​

  • address: string - 20-byte account address from which to retrieve the balance

  • blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: string - current balance, in Wei, as a hexadecimal value

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBalance","params":["0xfe3b557e8fb62b89f4916b721be55ceb828dbd73", "latest"],"id":53}' http://127.0.0.1:8545

eth_getBlockByHash​

Returns information about the block matching the specified block hash.

Parameters​

  • hash: string - 32-byte hash of a block

  • verbose: boolean - if true, returns the full transaction objects; if false, returns the transaction hashes

Returns​

result: object - block object, or null when there is no block

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByHash","params":["0xd5f1812548be429cbdc6376b29611fc49e06f1359758c4ceaaa3b393e2239f9c", false],"id":53}' http://127.0.0.1:8545

eth_getBlockByNumber​

Returns information about the block matching the specified block number.

Parameters​

  • blockNumber: string - integer representing a block number or one of the string tags latest, earliest, pending, finalized, or safe as described in block parameter

  • verbose: boolean - if true, returns the full transaction objects; if false, returns only the hashes of the transactions.

Returns​

result: object - block object, or null when there is no block.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["0x68B3", true],"id":1}' http://127.0.0.1:8545

eth_getBlockTransactionCountByHash​

Returns the number of transactions in the block matching the specified block hash.

Parameters​

hash: string - 32-byte block hash

Returns​

result: number - integer representing the number of transactions in the specified block, or null if no matching block hash is found

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByHash","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":53}' http://127.0.0.1:8545

eth_getBlockTransactionCountByNumber​

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

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: string - integer representing the number of transactions in the specified block, or null if no matching block number is found

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getBlockTransactionCountByNumber","params":["0xe8"],"id":51}' http://127.0.0.1:8545

eth_getCode​

Returns the code of the smart contract at the specified address. Besu stores compiled smart contract code as a hexadecimal value.

Parameters​

address: string - 20-byte contract address

blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: data - code stored at the specified address

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getCode","params":["0xa50a51c09a5c451c52bb714527e1974b686d8e77", "latest"],"id":53}' http://127.0.0.1:8545

eth_getFilterChanges​

Polls the specified filter and returns an array of changes that have occurred since the last poll.

Parameters​

filterId: string - filter ID

Returns​

result: array of strings or objects - if nothing changed since the last poll, an empty list; otherwise:

  • For filters created with eth_newBlockFilter, returns block hashes.

  • For filters created with eth_newPendingTransactionFilter, returns transaction hashes.

  • For filters created with eth_newFilter, returns log objects.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getFilterChanges","params":["0xf8bf5598d9e04fbe84523d42640b9b0e"],"id":1}' http://127.0.0.1:8545

eth_getFilterLogs​

Returns an array of logs for the specified filter.

Leave the --auto-log-bloom-caching-enabled command line option at the default value of true to improve log retrieval performance.

note

eth_getFilterLogs is only used for filters created with eth_newFilter. To specify a filter object and get logs without creating a filter, use eth_getLogs.

Parameters​

filterId: string - filter ID

Returns​

result: array of objects - list of log objects

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getFilterLogs","params":["0x5ace5de3985749b6a1b2b0d3f3e1fb69"],"id":1}' http://127.0.0.1:8545

eth_getLogs​

Returns an array of logs matching a specified filter object.

Leave the --auto-log-bloom-caching-enabled command line option at the default value of true to improve log retrieval performance.

caution

Using eth_getLogs to get logs from a large range of blocks, especially an entire chain from its genesis block, might cause Besu to hang for an indeterminable amount of time while generating the response. We recommend setting a range limit using the --rpc-max-logs-range option (or leaving it at its default value of 1000).

Parameters​

filterOptions: object - filter options object

Returns​

result: array of objects - list of log objects

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getLogs","params":[{"fromBlock":"earliest", "toBlock":"latest", "address": "0x2e1f232a9439c3d459fceca0beef13acc8259dd8", "topics":[]}], "id":1}' http://127.0.0.1:8545

eth_getMinerDataByBlockHash​

Returns miner data for the specified block.

Parameters​

hash: string - 32-byte block hash

Returns​

result: object - miner data object

curl -X POST --data '{"jsonrpc":"2.0","method": "eth_getMinerDataByBlockHash","params": ["0xbf137c3a7a1ebdfac21252765e5d7f40d115c2757e4a4abee929be88c624fdb7"],"id": 1}' http://127.0.0.1:8545

eth_getMinerDataByBlockNumber​

Returns miner data for the specified block.

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: object - miner data object

curl -X POST --data '{"jsonrpc":"2.0","method": "eth_getMinerDataByBlockNumber","params": ["0x7689D2"],"id": 1}' http://127.0.0.1:8545

eth_getProof​

Returns the account and storage values of the specified account, including the Merkle proof.

The API allows IoT devices or mobile apps which are unable to run light clients to verify responses from untrusted sources, by using a trusted block hash.

Parameters​

address: string - 20-byte address of the account or contract

keys: array of strings - list of 32-byte storage keys to generate proofs for

blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: object - account details object with the following fields:

  • balance: string - account balance

  • codeHash: string - 32-byte hash of the account code

  • nonce: string - number of transactions sent from the account

  • storageHash: string - 32-byte SHA3 of the storageRoot

  • accountProof: array of strings - list of RLP-encoded Merkle tree nodes, starting with the stateRoot

  • storageProof: array of objects - list of storage entry objects with the following fields:

    • key: string - storage key

    • value: string - storage value

    • proof: array of strings - list of RLP-encoded Merkle tree nodes, starting with the storageHash

curl -X POST --data '{"jsonrpc":"2.0","method": "eth_getProof","params": [
"0a8156e7ee392d885d10eaa86afd0e323afdcd95", ["0x0000000000000000000000000000000000000000000000000000000000000347"], "latest"],"id": 1}' http://127.0.0.1:8545

eth_getStorageAt​

Returns the value of a storage position at a specified address.

Parameters​

address: string - 20-byte storage address

index: string - integer index of the storage position

blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result : string - value at the specified storage position

Calculating the correct position depends on the storage you want to retrieve.

curl -X POST --data '{"jsonrpc":"2.0","method": "eth_getStorageAt","params": ["0x‭3B3F3E‬","0x0","latest"],"id": 53}' http://127.0.0.1:8545

eth_getTransactionByBlockHashAndIndex​

Returns transaction information for the specified block hash and transaction index position.

Parameters​

block: string - 32-byte hash of a block

index: string - integer representing the transaction index position

Returns​

result: object - transaction object, or null when there is no transaction

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockHashAndIndex","params":["0xbf137c3a7a1ebdfac21252765e5d7f40d115c2757e4a4abee929be88c624fdb7", "0x2"], "id":1}' http://127.0.0.1:8545

eth_getTransactionByBlockNumberAndIndex​

Returns transaction information for the specified block number and transaction index position.

Parameters​

blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

index: string - transaction index position

Returns​

result: object - transaction object, or null when there is no transaction

This request returns the third transaction in the 82990 block on the Ropsten testnet. You can also view this block and transaction on Etherscan.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByBlockNumberAndIndex","params":["82990", "0x2"], "id":1}' http://127.0.0.1:8545

eth_getTransactionByHash​

Returns transaction information for the specified transaction hash.

Parameters​

transaction: string - 32-byte transaction hash

Returns​

result: object - transaction object, or null when there is no transaction

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionByHash","params":["0xa52be92809541220ee0aaaede6047d9a6c5d0cd96a517c854d944ee70a0ebb44"],"id":53}' http://127.0.0.1:8545

eth_getTransactionCount​

Returns the number of transactions sent from a specified address. Use the pending tag to get the next account nonce not used by any pending transactions.

Parameters​

address: string - 20-byte account address

blockNumber or blockHash: string - integer representing a block number, block hash, or one of the string tags latest, earliest, or pending, as described in block parameter

Returns​

result: string - integer representing the number of transactions sent from the specified address

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionCount","params":["0xc94770007dda54cF92009BFF0dE90c06F603a09f","latest"],"id":1}' http://127.0.0.1:8545

eth_getTransactionReceipt​

Returns the receipt of a transaction by transaction hash. Receipts for pending transactions are not available.

If you enabled revert reason, the receipt includes available revert reasons in the response.

Parameters​

transaction: string - 32-byte hash of a transaction

Returns​

result: object - transaction receipt object, or null when there is no receipt

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getTransactionReceipt","params":["0x504ce587a65bdbdb6414a0c6c16d86a04dd79bfcc4f2950eec9634b30ce5370f"],"id":53}' http://127.0.0.1:8545

eth_getUncleByBlockHashAndIndex​

Returns uncle specified by block hash and index.

Parameters​

block: string - 32-byte block hash

uncleIndex: string - index of the uncle

Returns​

result: object - block object

note

Uncles don't contain individual transactions.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleByBlockHashAndIndex","params":["0xc48fb64230a82f65a08e7280bd8745e7fea87bc7c206309dee32209fe9a985f7", "0x0"],"id":1}' http://127.0.0.1:8545

eth_getUncleByBlockNumberAndIndex​

Returns uncle specified by block number and index.

Parameters​

  • blockNumber: string - integer representing a block number or one of the string tags latest, earliest, or pending, as described in block parameter

  • uncleIndex: string - index of the uncle

Returns​

result: object - block object

note

Uncles do not contain individual transactions.

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleByBlockNumberAndIndex","params":["0x7689D2", "0x0"],"id":1}' http://127.0.0.1:8545

eth_getUncleCountByBlockHash​

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

Parameters​

block: string - 32-byte block hash

Returns​

result: string - integer representing the number of uncles in the specified block

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_getUncleCountByBlockHash","params":["0xb903239f8543d04b5dc1ba6579132b143087c68db1b2168786408fcbce568238"],"id":1}' http://127.0.0.1:8545