curl --request POST \
  --url https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate \
  --header 'Content-Type: application/json' \
  --data '
{
  "tx": {
    "body": {
      "messages": [
        {
          "@type": "<string>"
        }
      ],
      "memo": "<string>",
      "timeout_height": "<string>",
      "unordered": true,
      "timeout_timestamp": "2023-11-07T05:31:56Z",
      "extension_options": [
        {
          "@type": "<string>"
        }
      ],
      "non_critical_extension_options": [
        {
          "@type": "<string>"
        }
      ]
    },
    "auth_info": {
      "signer_infos": [
        {
          "public_key": {
            "@type": "<string>"
          },
          "mode_info": {
            "single": {
              "mode": "SIGN_MODE_UNSPECIFIED"
            },
            "multi": {
              "bitarray": {
                "extra_bits_stored": 123,
                "elems": "aSDinaTvuI8gbWludGxpZnk="
              },
              "mode_infos": [
                {}
              ]
            }
          },
          "sequence": "<string>"
        }
      ],
      "fee": {
        "amount": [
          {
            "denom": "<string>",
            "amount": "<string>"
          }
        ],
        "gas_limit": "<string>",
        "payer": "<string>",
        "granter": "<string>"
      },
      "tip": {
        "amount": [
          {
            "denom": "<string>",
            "amount": "<string>"
          }
        ],
        "tipper": "<string>"
      }
    },
    "signatures": [
      "aSDinaTvuI8gbWludGxpZnk="
    ]
  },
  "tx_bytes": "aSDinaTvuI8gbWludGxpZnk="
}
'

import requests

url = "https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate"

payload = {
    "tx": {
        "body": {
            "messages": [{ "@type": "<string>" }],
            "memo": "<string>",
            "timeout_height": "<string>",
            "unordered": True,
            "timeout_timestamp": "2023-11-07T05:31:56Z",
            "extension_options": [{ "@type": "<string>" }],
            "non_critical_extension_options": [{ "@type": "<string>" }]
        },
        "auth_info": {
            "signer_infos": [
                {
                    "public_key": { "@type": "<string>" },
                    "mode_info": {
                        "single": { "mode": "SIGN_MODE_UNSPECIFIED" },
                        "multi": {
                            "bitarray": {
                                "extra_bits_stored": 123,
                                "elems": "aSDinaTvuI8gbWludGxpZnk="
                            },
                            "mode_infos": [{}]
                        }
                    },
                    "sequence": "<string>"
                }
            ],
            "fee": {
                "amount": [
                    {
                        "denom": "<string>",
                        "amount": "<string>"
                    }
                ],
                "gas_limit": "<string>",
                "payer": "<string>",
                "granter": "<string>"
            },
            "tip": {
                "amount": [
                    {
                        "denom": "<string>",
                        "amount": "<string>"
                    }
                ],
                "tipper": "<string>"
            }
        },
        "signatures": ["aSDinaTvuI8gbWludGxpZnk="]
    },
    "tx_bytes": "aSDinaTvuI8gbWludGxpZnk="
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    tx: {
      body: JSON.stringify({
        messages: [{'@type': '<string>'}],
        memo: '<string>',
        timeout_height: '<string>',
        unordered: true,
        timeout_timestamp: '2023-11-07T05:31:56Z',
        extension_options: [{'@type': '<string>'}],
        non_critical_extension_options: [{'@type': '<string>'}]
      }),
      auth_info: {
        signer_infos: [
          {
            public_key: {'@type': '<string>'},
            mode_info: {
              single: {mode: 'SIGN_MODE_UNSPECIFIED'},
              multi: {
                bitarray: {extra_bits_stored: 123, elems: 'aSDinaTvuI8gbWludGxpZnk='},
                mode_infos: [{}]
              }
            },
            sequence: '<string>'
          }
        ],
        fee: {
          amount: [{denom: '<string>', amount: '<string>'}],
          gas_limit: '<string>',
          payer: '<string>',
          granter: '<string>'
        },
        tip: {amount: [{denom: '<string>', amount: '<string>'}], tipper: '<string>'}
      },
      signatures: ['aSDinaTvuI8gbWludGxpZnk=']
    },
    tx_bytes: 'aSDinaTvuI8gbWludGxpZnk='
  })
};

fetch('https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'tx' => [
        'body' => [
                'messages' => [
                                [
                                                                '@type' => '<string>'
                                ]
                ],
                'memo' => '<string>',
                'timeout_height' => '<string>',
                'unordered' => true,
                'timeout_timestamp' => '2023-11-07T05:31:56Z',
                'extension_options' => [
                                [
                                                                '@type' => '<string>'
                                ]
                ],
                'non_critical_extension_options' => [
                                [
                                                                '@type' => '<string>'
                                ]
                ]
        ],
        'auth_info' => [
                'signer_infos' => [
                                [
                                                                'public_key' => [
                                                                                                                                '@type' => '<string>'
                                                                ],
                                                                'mode_info' => [
                                                                                                                                'single' => [
                                                                                                                                                                                                                                                                'mode' => 'SIGN_MODE_UNSPECIFIED'
                                                                                                                                ],
                                                                                                                                'multi' => [
                                                                                                                                                                                                                                                                'bitarray' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'extra_bits_stored' => 123,
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                'elems' => 'aSDinaTvuI8gbWludGxpZnk='
                                                                                                                                                                                                                                                                ],
                                                                                                                                                                                                                                                                'mode_infos' => [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                [
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                ]
                                                                                                                                                                                                                                                                ]
                                                                                                                                ]
                                                                ],
                                                                'sequence' => '<string>'
                                ]
                ],
                'fee' => [
                                'amount' => [
                                                                [
                                                                                                                                'denom' => '<string>',
                                                                                                                                'amount' => '<string>'
                                                                ]
                                ],
                                'gas_limit' => '<string>',
                                'payer' => '<string>',
                                'granter' => '<string>'
                ],
                'tip' => [
                                'amount' => [
                                                                [
                                                                                                                                'denom' => '<string>',
                                                                                                                                'amount' => '<string>'
                                                                ]
                                ],
                                'tipper' => '<string>'
                ]
        ],
        'signatures' => [
                'aSDinaTvuI8gbWludGxpZnk='
        ]
    ],
    'tx_bytes' => 'aSDinaTvuI8gbWludGxpZnk='
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate"

	payload := strings.NewReader("{\n  \"tx\": {\n    \"body\": {\n      \"messages\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ],\n      \"memo\": \"<string>\",\n      \"timeout_height\": \"<string>\",\n      \"unordered\": true,\n      \"timeout_timestamp\": \"2023-11-07T05:31:56Z\",\n      \"extension_options\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ],\n      \"non_critical_extension_options\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ]\n    },\n    \"auth_info\": {\n      \"signer_infos\": [\n        {\n          \"public_key\": {\n            \"@type\": \"<string>\"\n          },\n          \"mode_info\": {\n            \"single\": {\n              \"mode\": \"SIGN_MODE_UNSPECIFIED\"\n            },\n            \"multi\": {\n              \"bitarray\": {\n                \"extra_bits_stored\": 123,\n                \"elems\": \"aSDinaTvuI8gbWludGxpZnk=\"\n              },\n              \"mode_infos\": [\n                {}\n              ]\n            }\n          },\n          \"sequence\": \"<string>\"\n        }\n      ],\n      \"fee\": {\n        \"amount\": [\n          {\n            \"denom\": \"<string>\",\n            \"amount\": \"<string>\"\n          }\n        ],\n        \"gas_limit\": \"<string>\",\n        \"payer\": \"<string>\",\n        \"granter\": \"<string>\"\n      },\n      \"tip\": {\n        \"amount\": [\n          {\n            \"denom\": \"<string>\",\n            \"amount\": \"<string>\"\n          }\n        ],\n        \"tipper\": \"<string>\"\n      }\n    },\n    \"signatures\": [\n      \"aSDinaTvuI8gbWludGxpZnk=\"\n    ]\n  },\n  \"tx_bytes\": \"aSDinaTvuI8gbWludGxpZnk=\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate")
  .header("Content-Type", "application/json")
  .body("{\n  \"tx\": {\n    \"body\": {\n      \"messages\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ],\n      \"memo\": \"<string>\",\n      \"timeout_height\": \"<string>\",\n      \"unordered\": true,\n      \"timeout_timestamp\": \"2023-11-07T05:31:56Z\",\n      \"extension_options\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ],\n      \"non_critical_extension_options\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ]\n    },\n    \"auth_info\": {\n      \"signer_infos\": [\n        {\n          \"public_key\": {\n            \"@type\": \"<string>\"\n          },\n          \"mode_info\": {\n            \"single\": {\n              \"mode\": \"SIGN_MODE_UNSPECIFIED\"\n            },\n            \"multi\": {\n              \"bitarray\": {\n                \"extra_bits_stored\": 123,\n                \"elems\": \"aSDinaTvuI8gbWludGxpZnk=\"\n              },\n              \"mode_infos\": [\n                {}\n              ]\n            }\n          },\n          \"sequence\": \"<string>\"\n        }\n      ],\n      \"fee\": {\n        \"amount\": [\n          {\n            \"denom\": \"<string>\",\n            \"amount\": \"<string>\"\n          }\n        ],\n        \"gas_limit\": \"<string>\",\n        \"payer\": \"<string>\",\n        \"granter\": \"<string>\"\n      },\n      \"tip\": {\n        \"amount\": [\n          {\n            \"denom\": \"<string>\",\n            \"amount\": \"<string>\"\n          }\n        ],\n        \"tipper\": \"<string>\"\n      }\n    },\n    \"signatures\": [\n      \"aSDinaTvuI8gbWludGxpZnk=\"\n    ]\n  },\n  \"tx_bytes\": \"aSDinaTvuI8gbWludGxpZnk=\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://cosmos-rest.publicnode.com/cosmos/tx/v1beta1/simulate")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"tx\": {\n    \"body\": {\n      \"messages\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ],\n      \"memo\": \"<string>\",\n      \"timeout_height\": \"<string>\",\n      \"unordered\": true,\n      \"timeout_timestamp\": \"2023-11-07T05:31:56Z\",\n      \"extension_options\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ],\n      \"non_critical_extension_options\": [\n        {\n          \"@type\": \"<string>\"\n        }\n      ]\n    },\n    \"auth_info\": {\n      \"signer_infos\": [\n        {\n          \"public_key\": {\n            \"@type\": \"<string>\"\n          },\n          \"mode_info\": {\n            \"single\": {\n              \"mode\": \"SIGN_MODE_UNSPECIFIED\"\n            },\n            \"multi\": {\n              \"bitarray\": {\n                \"extra_bits_stored\": 123,\n                \"elems\": \"aSDinaTvuI8gbWludGxpZnk=\"\n              },\n              \"mode_infos\": [\n                {}\n              ]\n            }\n          },\n          \"sequence\": \"<string>\"\n        }\n      ],\n      \"fee\": {\n        \"amount\": [\n          {\n            \"denom\": \"<string>\",\n            \"amount\": \"<string>\"\n          }\n        ],\n        \"gas_limit\": \"<string>\",\n        \"payer\": \"<string>\",\n        \"granter\": \"<string>\"\n      },\n      \"tip\": {\n        \"amount\": [\n          {\n            \"denom\": \"<string>\",\n            \"amount\": \"<string>\"\n          }\n        ],\n        \"tipper\": \"<string>\"\n      }\n    },\n    \"signatures\": [\n      \"aSDinaTvuI8gbWludGxpZnk=\"\n    ]\n  },\n  \"tx_bytes\": \"aSDinaTvuI8gbWludGxpZnk=\"\n}"

response = http.request(request)
puts response.read_body

{
  "gas_info": {
    "gas_wanted": "<string>",
    "gas_used": "<string>"
  },
  "result": {
    "data": "aSDinaTvuI8gbWludGxpZnk=",
    "log": "<string>",
    "events": [
      {
        "type": "<string>",
        "attributes": [
          {
            "key": "<string>",
            "value": "<string>",
            "index": true
          }
        ]
      }
    ],
    "msg_responses": [
      {
        "@type": "<string>"
      }
    ]
  }
}

{
  "code": 123,
  "message": "<string>",
  "details": [
    {
      "@type": "<string>"
    }
  ]
}