Questions tagged [json-rpc]

json-formatted remote procedure calls to communicate with ethereum clients

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27 views

Is it possible to filter pendingTransactions?

To get a list of the pending transactions that my node is aware of I can easily call the eth_pendingTransactions jRPC call. This will give a big list of pending transactions, which all need parsing to ...
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17 views

Why does Ethereum use JSON-RPC and not gRPC?

I am fairly new to networking protocols especially JSON-RPC and gRPC as they are not nearly as common in web development as REST. I was reading around and seems like gRPC generally performs better. So ...
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1answer
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json rpc hex string weird padding/encoding

When sending eth_call to get erc20 token WETH name and symbol I get hex response padded with bunch of zeros and a mysterious digit '2'. for symbol I get response: "...
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6 views

how to sync a node from specific node or ip

I would like to sync a ethereum node but I got a problem i'm trying to sync it as light client but: hub=trezor vendor=21324 failcount=3 err="failed to initialize libusb: libusb: unknown error [code -...
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24 views

How to config geth node to get ERC-20 tokens balances

I'm trying to tune my geth node to get ERC-20 tokens balances, but y API call always returns {'jsonrpc': '2.0', 'id': 1, 'result': '0x'} My geth node version: instance=Geth/v1.9.13-stable-cbc4ac26/...
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12 views

Simple way to balance web3j connections between nodes

Context: I have a client that can connect to 3 local-network nodes to distribute query-loads and be more resilient to network/software issues. I have managed to create a -simple- watch-dog with a ...
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42 views

sending request with curl returns that method does not exist

I try to make call with curl curl -X POST -H "Content-Type: application/json" --data '{"jsonrpc":"2.0","method":"eth_accounts","params":[],"id":67}' http://localhost:8545 and it returns this: {"...
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1answer
49 views

How can I tell if the node I am using is exposing the Parity trace methods?

What is the best way to tell if the node I am using is exposing the Parity trace methods? One way I know if is to call a contract on Kovan and look for a revert reason that says to expose the trace ...
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1answer
28 views

Will code utilising web3.js be compatible with Ethereum 2.0?

I'd like to start developing a solution targeting the Ethereum blockchain but I want to target the Ethereum 2.0 blockchain and I'm not so interested in 1.0 anymore. Can I already do the development ...
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2answers
15 views

.json files for contracts are not created

I am really new in ethereum and solidity and I am having hard time to figure out how to get the .json equivalent for contracts. I have the Campaign.sol inside the contractsFolder. The Campaign.sol ...
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0answers
33 views

Why does ethereum JSON RPC encode bytes as hex?

Why not use base64 since it would be more compact?
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1answer
44 views

Remix IDE Desktop + Geth node as test network

I'm trying to connect the Remix Desktop client to my local Geth node. as usual i added: geth --rpc --rpccorsdomain https://remix.ethereum.org while starting up the node. This obviously only works ...
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2answers
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ERROR: Provided address “6.963865902119903e+47” is invalid

Full error log: formatters.js:471 Uncaught Error: Provided address "6.963865902119903e+47" is invalid, the capitalization checksum test failed, or its an indrect IBAN address which can't be ...
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31 views

Unable to get the Ethereum accounts (eth_accounts) using the JSON RPC

I launched an Ethereum installation with the Amazon Blockchain Templates using the simplest installation, the docker-local with a private network (not connected to the public Ethereum network). ...
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13 views

Can I send JSON RPC request to Parity not from intranet? (e.g. from another external IP address)

Can I send JSON-RPC request not from a local network(192.168.xxx) ? so that I can re-use my existing ETH nodes. thanks
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1answer
35 views

Accessing Ethereum network via JSON RPC from wallet balance/transactions

sorry if the question is silly.... I am tying to build a simple app that checks ETH wallet addresses balances and transactions (for both ETH and Tokens). As far as my knowledge goes, I think that I ...
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1answer
68 views

Parity IPC direct connect

Before Parity I used Geth, and made requests like: echo '{"jsonrpc":"2.0","method":"eth_getBlockByNumber","params":["latest", false],"id":1}' | nc -NU geth.ipc and It worked! In Parity v2.7.2 and ...
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1answer
19 views

Problem with contracts being deployed multiple times in Node.JS backend

I have a Javascript frontend that passes records in a JSON to the backend via Express to be deployed to the blockchain (currently using Rinkeby) with truffle-hdwallet-provider. This appears to work ...
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1answer
33 views

Difference between web3.eth.personal.getAccounts() with web3.eth.getAccounts()

What are the differences between web3.eth.personal.getAccounts() and web3.eth.getAccounts()? environment truffle: v5.1.7 using truffle console.
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1answer
18 views

Receiving unexpected JSONRPC requests on my website

I have a production website (nothing about blockchain or related) and I a received hundreds of POST request to "/" with these params. Obviously my server raise an error because it doesn't know how to ...
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1answer
60 views

Infura getLogs returns an empty result

I'm writing a crypto based system with PHP on Infura, and now I am coding a script to retrieve logs for a specific address. This is my code: $ch = curl_init($my_server_url); $data = array( '...
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0answers
19 views

Calculated blockhash of PoA block mismatches with actual blockhash returned by RPC

I set up a Demo PoA chain using Parity Etheruem. I sent some transactions to it and it started producing blocks. A block on my demo PoA chain was generated with block hash ...
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1answer
39 views

How to guarantee the order of transactions in MetaMask?

I create my transactions with ethers.js and push them into an array like this: const promises = []; promises.push(createTokenApprovalTx()); promises.push(createFooTx()); It's important that the ...
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1answer
60 views

transactions in rpc block response sometimes have chain null and sometimes correct chain

when doing e.g. a blockByNumber rpc request I am getting a result like this from parity: https://gist.github.com/ligi/fbc7061d93f087cf0eb0f4db83d1fced what is puzzling me that some transactions have: ...
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1answer
28 views

What is the client version?

I am using Infura and web3.py. When I connect to Infura the web3 object has a clientVersion property that reads this from JSON RPC "Geth/v1.8.15-omnibus-255989da/linux-amd64/go1.10.1" Can someone ...
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0answers
110 views

Curl Request Java - How To

I am looking to use some of the management admin API's found here: https://github.com/ethereum/go-ethereum/wiki/Management-APIs but unfortunately, the web3j library does not support the calls that I ...
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1answer
34 views

TxPool on Ganache

I started using Ganache to run Ethereum and tried via cURL the following: curl -X POST -d '{"jsonrpc":"2.0","method":"txpool_status","params":[],"id":1}' http://ip:port But I got the message: ...
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1answer
22 views

eth_getStorageAt params names

I am calling geth rpc method eth_getStorageAt using json-rpc-cpp libarary. I need to know the parameters' names for the method. I can find parameters' names for eth_sendTransaction from here, which ...
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0answers
14 views

hwo to identifie error from transaction error object?

is it possible to know what is the reason of transaction error from "error" object (nonce, insufficient fund ..) is there status or something to test using it ? Geth error message is generic, I ...
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1answer
42 views

How a json-rpc client can tell that a transaction it's sent has been rejected?

Judging from https://github.com/ethereum/wiki/wiki/JSON-RPC the api client can synchronize on events such as: Transaction is received/pending: eth_gettransactionbyhash returns non-null with block ...
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35 views

Calling a string from smart contract in go

all I want to do is call a string from a smart contract I've written using go. My smart contract is: pragma solidity ^0.4.24; contract String { string store = "abcdef"; function getStore() ...
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1answer
22 views

JSON-RPC: TheDao contract returning not null values for not existing methods in the contract

When using the geth JSON-RPC eth_call to retrieve some ERC20 token contracts symbol and name information, it comes up the case of TheDao contract. I was expecting to receive a null/empty string like ...
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0answers
29 views

Inconsistent responses with 'eth_getTransactionByHash' through RPC API. Can anyone help?

I have been using the requests library with python to query the geth/rpc api in order to get ETH transaction data. I connected to geth via "geth --rpc --unlock TESTINGADDRESSWITHNOVALUE --allow-...
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1answer
41 views

Pending transactions not mined in private network

I have created a node with the following genesis block: { "config":{ "chainId":9119, ...
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2answers
556 views

How to check Ethereum smart contract info?

I want to know 3 things: Is an address a smart contract? Is this smart contract an ERC20 or ERC721 token? Is the Solidity code public?
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1answer
23 views

View sendTransaction implementation

I'd like to see code that implements getAccounts and sendTransaction in a provider. I tried digging into the Metamask source code and found the line where Metamask supplies the Web3 provider, but I ...
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1answer
28 views

How to get initial balances for all those who bought tokens?

Is it possible to get the initial balances for all those accounts who bought ERC20 tokens? If that’s possible, how that can be achieved? I’m wondering if there is any way of getting that information ...
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2answers
74 views

Get All Contracts from Blockchain

I am developing a large database of exploitable contract addresses and creating a website to host such a database for users to use to see if contracts are safe. Is there a way to get all contract ...
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16 views

What are the steps I have to perform to make a transaction using for ETC using Kotti Testnet geth JSON RPC APIs?

I've founded API resource from Resource, and from that resource I've got This reference, which redirected me to all those JSON RPC methods and localhost geth port and its setup. What should I have ...
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1answer
30 views

Is it possible to use address you don't own while running ethereum RPC node (using geth)?

In other words, you start your own node and then somehow add accounts you don't own (aka - you don't have their private keys)? I'm asking because I wanted to make my own node exposed via RPC/...
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1answer
52 views

Can I expose geth's rpc ONLY to Metamask connections?

I am building a private chain and rpcaddr is set to 0.0.0.0But recently I found out that this private chain has been attacked by a foreign IP, it kept trying to transfer those worthless ether out from ...
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1answer
21 views

How is the length of the message counted when calling eth_sign?

According to https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_sign The sign method calculates an Ethereum specific signature with: sign(keccak256("\x19Ethereum Signed Message:\n" + len(message) +...
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26 views

invalid JSON RPC when using custom domain name

geth --testnet --networkid 3 --syncmode "fast" --datadir "." --cache=2048 --rpc --rpcport 8545 --rpcaddr example.ropsten.hk --rpcvhosts example.ropsten.hk --rpccorsdomain "*" --rpcapi="web3,miner,...
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2answers
63 views

“Gas estimation failed” on Ropsten with Invalid RPC JSON

I'm running into an issue going through a basic example in "Mastering Ethereum"... I have a Faucet contract (on Ropsten) per the book that looks like... pragma solidity ^0.5.1; //mastering ethereum ...
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1answer
144 views

How Do You Parse Web3 Retuned JSON Objects of Events?

I am using Web3 1.0 to listen to events from a contract like this: tokenContract.events.AddressList({ fromBlock: 6020474, toBlock: 'latest' }, (error, events) => { ...
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1answer
35 views

How to add a custom JSON-RPC endpoint to geth?

I'm building an Ethereum private network and I want to make a custom JSON-RPC endpoint. I've been customizing and adding some things in the go-ethereum source code but I don't know yet where to look ...
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0answers
28 views

Why is the filter ID different ganache-cli and geth

request {"jsonrpc":"2.0","method":"eth_newFilter","params":[{"topics":["0x100791de9f40bf2d56ffa6dc5597d2fd0b2703ea70bc7548cd74c04f5d215ab7"]}],"id":0} ganache-cli`s response {"jsonrpc"='2.0', "id"=...
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2answers
154 views

How to get the miner address of a block with infura Rinkeby endpoint?

I've read some docs online that to get the miner/sealer/signer address of a particular block that runs with the Ethereum PoA/Clique consensus (the Rinkeby testnet for example), I need to call the ...
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0answers
27 views

How to enable and use the accounting module?

I found the accounting module in this line and want to use them. i attached the accounting module to parameter --rpcapi accounting when run console node but could not found this module. run node: ....
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I want to make multi-node , not private network

I know how to make multi-node in private network, but I have a question how to make a multi-node with other machines. this picture shows independent two nodes, and you can see blank on admin.peers ...

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