curl -sS -X POST https://api-opbnb-mainnet.n.dwellir.com/1a4a621f-4f4a-432f-bcc3-76e741750166 \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}'

import { JsonRpcProvider } from 'ethers';

const provider = new JsonRpcProvider('https://api-opbnb-mainnet.n.dwellir.com/1a4a621f-4f4a-432f-bcc3-76e741750166');
const latest = await provider.getBlockNumber();
console.log('block', latest);

import requests

url = 'https://api-opbnb-mainnet.n.dwellir.com/1a4a621f-4f4a-432f-bcc3-76e741750166'
payload = { 'jsonrpc': '2.0', 'id': 1, 'method': 'eth_blockNumber', 'params': [] }
resp = requests.post(url, json=payload)
print(resp.json())

package main

import (
  "bytes"
  "fmt"
  "net/http"
  "io/ioutil"
)

func main() {
  url := "https://api-opbnb-mainnet.n.dwellir.com/1a4a621f-4f4a-432f-bcc3-76e741750166"
  payload := []byte("{\"jsonrpc\":\"2.0\",\"id\":1,\"method\":\"eth_blockNumber\",\"params\":[]}")
  resp, err := http.Post(url, "application/json", bytes.NewBuffer(payload))
  if err != nil { panic(err) }
  defer resp.Body.Close()
  body, _ := ioutil.ReadAll(resp.Body)
  fmt.Println(string(body))
}