curl --request POST \
  --url https://api.example.com/EXPERIMENTAL_call_function \
  --header 'Content-Type: application/json' \
  --data '
{
  "method": "EXPERIMENTAL_call_function",
  "params": {
    "block_id": 1,
    "account_id": "<string>",
    "args_base64": "<string>",
    "method_name": "<string>"
  },
  "id": "dontcare",
  "jsonrpc": "2.0"
}
'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    method: 'EXPERIMENTAL_call_function',
    params: {
      block_id: 1,
      account_id: '<string>',
      args_base64: '<string>',
      method_name: '<string>'
    },
    id: 'dontcare',
    jsonrpc: '2.0'
  })
};

fetch('https://api.example.com/EXPERIMENTAL_call_function', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.example.com/EXPERIMENTAL_call_function"

payload = {
    "method": "EXPERIMENTAL_call_function",
    "params": {
        "block_id": 1,
        "account_id": "<string>",
        "args_base64": "<string>",
        "method_name": "<string>"
    },
    "id": "dontcare",
    "jsonrpc": "2.0"
}
headers = {"Content-Type": "application/json"}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

{
  "result": {
    "block_hash": "<string>",
    "block_height": 1,
    "logs": [
      "<string>"
    ],
    "result": [
      127
    ]
  },
  "id": "<string>",
  "jsonrpc": "<string>"
}