SimulateTransaction

Simulate transaction

post

Submit a trial contract invocation to simulate how it would be executed by the network. This endpoint calculates the effective transaction data, required authorizations, and minimal resource fee. It provides a way to test and analyze the potential outcomes of a transaction without actually submitting it to the network.

Authorizations

ApiKeyAuth

api-keystringRequired

Body

application/json

jsonrpcstringRequiredExample: 2.0

idintegerRequiredExample: 8675309

methodstringRequiredExample: simulateTransaction

Responses

200

Transaction simulation completed successfully

application/json

jsonrpcstringOptionalExample: 2.0

idintegerOptionalExample: 8675309

400

Bad Request

401

Unauthorized — Missing or invalid API key

500

Internal Server Error

post

/

HTTPcURLJavaScriptPython

POST / HTTP/1.1
Host: soroban-mainnet.nownodes.io
api-key: YOUR_API_KEY
Content-Type: application/json
Accept: */*
Content-Length: 420

{
  "jsonrpc": "2.0",
  "id": 8675309,
  "method": "simulateTransaction",
  "params": {
    "transaction": "AAAAAgAAAAAg4dbAxsGAGICfBG3iT2cKGYQ6hK4sJWzZ6or1C5v6GAAAAGQAJsOiAAAAEQAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAEAAAAAAAAAGAAAAAAAAAABzAP+dP0PsNzYvFF1pv7a8RQXwH5eg3uZBbbWjE9PwAsAAAAJaW5jcmVtZW50AAAAAAAAAgAAABIAAAAAAAAAACDh1sDGwYAYgJ8EbeJPZwoZhDqEriwlbNnqivULm/oYAAAAAwAAAAMAAAAAAAAAAAAAAAA=",
    "resourceConfig": {
      "instructionLeeway": 3000000
    }
  }
}

{
  "jsonrpc": "2.0",
  "id": 8675309,
  "result": {
    "transactionData": "AAAAAAAAAAIAAAAGAAAAAcwD/nT9D7Dc2LxRdab+2vEUF8B+XoN7mQW21oxPT8ALAAAAFAAAAAEAAAAHy8vNUZ8vyZ2ybPHW0XbSrRtP7gEWsJ6zDzcfY9P8z88AAAABAAAABgAAAAHMA/50/Q+w3Ni8UXWm/trxFBfAfl6De5kFttaMT0/ACwAAABAAAAABAAAAAgAAAA8AAAAHQ291bnRlcgAAAAASAAAAAAAAAAAg4dbAxsGAGICfBG3iT2cKGYQ6hK4sJWzZ6or1C5v6GAAAAAEAHfKyAAAFiAAAAIgAAAAAAAAAAw==",
    "minResourceFee": "90353",
    "events": [
      "AAAAAQAAAAAAAAAAAAAAAgAAAAAAAAADAAAADwAAAAdmbl9jYWxsAAAAAA0AAAAgzAP+dP0PsNzYvFF1pv7a8RQXwH5eg3uZBbbWjE9PwAsAAAAPAAAACWluY3JlbWVudAAAAAAAABAAAAABAAAAAgAAABIAAAAAAAAAACDh1sDGwYAYgJ8EbeJPZwoZhDqEriwlbNnqivULm/oYAAAAAwAAAAM=",
      "AAAAAQAAAAAAAAABzAP+dP0PsNzYvFF1pv7a8RQXwH5eg3uZBbbWjE9PwAsAAAACAAAAAAAAAAIAAAAPAAAACWZuX3JldHVybgAAAAAAAA8AAAAJaW5jcmVtZW50AAAAAAAAAwAAAAw="
    ],
    "results": [
      {
        "auth": [
          "text"
        ],
        "xdr": "AAAAAwAAAAw="
      }
    ],
    "cost": {
      "cpuInsns": "1635562",
      "memBytes": "1295756"
    },
    "latestLedger": 2552139
  }
}