curl --request POST \
  --url https://api.gelato.cloud/rpc/{chainId} \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <x-api-key>' \
  --data '
{
  "id": 123,
  "jsonrpc": "2.0",
  "method": "eth_chainId"
}
'

{
  "id": 1,
  "jsonrpc": "2.0",
  "result": "1"
}