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Make requests

The Ethereum network supports requests with HTTP or WebSockets. HTTP requires continual requests to the URL endpoint, whereas WebSockets maintains the connection. You can also make batch requests to the Ethereum network.

curl or wscat​

Use curl to make the HTTPS requests and wscat for WebSocket requests.

danger

Ensure that you replaceYOUR-API-KEY with a API key from your Infura dashboard.

curl -X POST \
-H "Content-Type: application/json" \
--data '{"jsonrpc": "2.0", "id": 1, "method": "eth_blockNumber", "params": []}' \
"https://mainnet.infura.io/v3/YOUR-API-KEY"
info

In Windows Powershell, quotations in curl commands can behave differently than expected. We recommend using Postman on Windows systems.

Postman​

Call the JSON-RPC methods using Postman.

Click the Run in Postman button below to fork the collection and make requests.

Run in Postman

info

Set the correct variables for your API key and network before running requests.

Web3.js​

Make sure you installed the web3.js library

Make sure that you installed the latest version of the web3.js library, which is 4.x when this documentation was updated. Install web3.js from the npm package site.

Save the following script to a file, e.g. index.js

var { Web3 } = require("web3");
var provider = "https://mainnet.infura.io/v3/<API-KEY>";
var web3Provider = new Web3.providers.HttpProvider(provider);
var web3 = new Web3(web3Provider);
web3.eth.getBlockNumber().then((result) => {
  console.log("Latest Ethereum Block is ", result);
});

In a terminal window, run the script with node index.js

Latest Ethereum Block is  14659509

Ethers​

Save the following script to a file, e.g. index.js

var ethers = require("ethers");
var url = "https://mainnet.infura.io/v3/<API-KEY>";
var customHttpProvider = new ethers.providers.JsonRpcProvider(url);
customHttpProvider.getBlockNumber().then((result) => {
  console.log("Current block number: " + result);
});

In a terminal window, run the script with node index.js

Latest Ethereum Block is  14659509

NodeJS​

Save the following script to a file, e.g. index.js

const https = require("https");
const projectId = "<API-KEY>";
const data = JSON.stringify({
  jsonrpc: "2.0",
  method: "eth_blockNumber",
  params: [],
  id: 1,
});
const options = {
  host: "mainnet.infura.io",
  port: 443,
  path: "/v3/" + projectId,
  method: "POST",
  headers: {
    "Content-Type": "application/json",
  },
};
const req = https.request(options, (res) => {
  console.log(`statusCode: ${res.statusCode}`);

  res.on("data", (d) => {
    process.stdout.write(d);
  });
});

req.on("error", (error) => {
  console.error(error);
});

req.write(data);
req.end();

In a terminal window, run the script with node index.js

statusCode: 200
{"jsonrpc":"2.0","id":1,"result":"0xe08e11"}

Go​

  1. Initialize a new go module: go mod init infura.
  2. Install the go-ethereum dependency: go get github.com/ethereum/go-ethereum/rpc.
  3. Save the following script to a file, e.g. infura.go.
package main

import (
    "fmt"
    "log"

    "github.com/ethereum/go-ethereum/rpc"
)

type Block struct {
    Number string
}

func main() {
    client, err := rpc.Dial("https://mainnet.infura.io/v3/<API-KEY>")
    if err != nil {
        log.Fatalf("Could not connect to Infura: %v", err)
    }

    var lastBlock Block
    err = client.Call(&lastBlock, "eth_getBlockByNumber", "latest", true)
    if err != nil {
        fmt.Println("Cannot get the latest block:", err)
        return
    }

    fmt.Printf("Latest block: %v\n", lastBlock.Number)
}

In a terminal window, run the script with go run infura.go.

Output:

Latest block: 0x....

Python​

Run the following code with Python.

from web3 import Web3, HTTPProvider
connection = Web3(HTTPProvider('https://mainnet.infura.io/v3/<API-KEY>'))
print ("Latest Ethereum block number", connection.eth.blockNumber)

Output looks like:

Latest Ethereum block number 14659569
Last updated on