POST /rpc

POST

https://casper.nownodes.io/rpc

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Submits a Version1 transaction to the Casper blockchain. Returns the hash of the accepted transaction.

Body

application/json

JSON-RPC request

jsonrpcstringrequired

JSON-RPC protocol version

methodstringrequired

RPC method

paramsobjectrequired

Object containing the transaction to submit

Show child attributes

transactionobject

Transaction object

Show child attributes

Version1object

Version1 transaction

Show child attributes

hashstring

Transaction hash

headerobject

Metadata for the transaction

Show child attributes

chain_namestring

Name of the blockchain

timestampstring<date-time>

Transaction creation time

ttlstring

Time-to-live of the transaction

body_hashstring

Hash of the transaction payload

pricing_modeobject

Gas pricing mode

Show child attributes

Fixedobject

Show child attributes

gas_price_toleranceinteger

Allowed tolerance for gas price

payloadobject

Transaction fields and arguments

Show child attributes

fieldsobject

Show child attributes

initiator_addrobject

Show child attributes

PublicKeystring

Public key of transaction initiator

argsArray<Array<object>>

Arguments for the transaction

targetstring

Target of the transaction

entry_pointstring

Entry point function

transaction_categoryinteger

Transaction category

schedulingstring

Scheduling type

approvalsArray<object>

List of approvals (signatures)

Show child attributes

signerstring

Public key of signer

signaturestring

Signature of the transaction

Response

200OK

Transaction submitted successfully

POST /rpc

curl -X POST 'https://casper.nownodes.io/rpc' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "account_put_transaction",
    "params": {
      "transaction": {
        "Version1": {
          "hash": "PLACEHOLDER_HASH",
          "header": {
            "chain_name": "casper",
            "timestamp": "2025-12-10T12:00:00.000Z",
            "ttl": "1h",
            "body_hash": "PLACEHOLDER_BODY_HASH",
            "pricing_mode": {
              "Fixed": {
                "gas_price_tolerance": 1
              }
            }
          },
          "payload": {
            "fields": {
              "initiator_addr": {
                "PublicKey": "01abcdef...123456"
              },
              "args": [
                [
                  {}
                ]
              ],
              "target": "Native",
              "entry_point": "Transfer",
              "transaction_category": 0,
              "scheduling": "Standard"
            }
          },
          "approvals": [
            {
              "signer": "01abcdef...123456",
              "signature": "01abcd1234...5678"
            }
          ]
        }
      }
    }
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://casper.nownodes.io/rpc");
const result = await provider.send("account_put_transaction", {
  "transaction": {
    "Version1": {
      "hash": "PLACEHOLDER_HASH",
      "header": {
        "chain_name": "casper",
        "timestamp": "2025-12-10T12:00:00.000Z",
        "ttl": "1h",
        "body_hash": "PLACEHOLDER_BODY_HASH",
        "pricing_mode": {
          "Fixed": {
            "gas_price_tolerance": 1
          }
        }
      },
      "payload": {
        "fields": {
          "initiator_addr": {
            "PublicKey": "01abcdef...123456"
          },
          "args": [
            [
              {}
            ]
          ],
          "target": "Native",
          "entry_point": "Transfer",
          "transaction_category": 0,
          "scheduling": "Standard"
        }
      },
      "approvals": [
        {
          "signer": "01abcdef...123456",
          "signature": "01abcd1234...5678"
        }
      ]
    }
  }
});
console.log(result);

require 'eth'
require 'json'
require 'net/http'

uri = URI('https://casper.nownodes.io/rpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "account_put_transaction",
  "params": {
    "transaction": {
      "Version1": {
        "hash": "PLACEHOLDER_HASH",
        "header": {
          "chain_name": "casper",
          "timestamp": "2025-12-10T12:00:00.000Z",
          "ttl": "1h",
          "body_hash": "PLACEHOLDER_BODY_HASH",
          "pricing_mode": {
            "Fixed": {
              "gas_price_tolerance": 1
            }
          }
        },
        "payload": {
          "fields": {
            "initiator_addr": {
              "PublicKey": "01abcdef...123456"
            },
            "args": [
              [
                {}
              ]
            ],
            "target": "Native",
            "entry_point": "Transfer",
            "transaction_category": 0,
            "scheduling": "Standard"
          }
        },
        "approvals": [
          {
            "signer": "01abcdef...123456",
            "signature": "01abcd1234...5678"
          }
        ]
      }
    }
  },
  "id": 1
}'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  http.request(request)
end

puts JSON.parse(response.body)

from web3 import Web3

w3 = Web3(Web3.HTTPProvider("https://casper.nownodes.io/rpc"))
response = w3.provider.make_request("account_put_transaction", {
  "transaction": {
    "Version1": {
      "hash": "PLACEHOLDER_HASH",
      "header": {
        "chain_name": "casper",
        "timestamp": "2025-12-10T12:00:00.000Z",
        "ttl": "1h",
        "body_hash": "PLACEHOLDER_BODY_HASH",
        "pricing_mode": {
          "Fixed": {
            "gas_price_tolerance": 1
          }
        }
      },
      "payload": {
        "fields": {
          "initiator_addr": {
            "PublicKey": "01abcdef...123456"
          },
          "args": [
            [
              {}
            ]
          ],
          "target": "Native",
          "entry_point": "Transfer",
          "transaction_category": 0,
          "scheduling": "Standard"
        }
      },
      "approvals": [
        {
          "signer": "01abcdef...123456",
          "signature": "01abcd1234...5678"
        }
      ]
    }
  }
})
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://casper.nownodes.io/rpc"),
});

const result = await client.request({
  method: "account_put_transaction",
  params: {
  "transaction": {
    "Version1": {
      "hash": "PLACEHOLDER_HASH",
      "header": {
        "chain_name": "casper",
        "timestamp": "2025-12-10T12:00:00.000Z",
        "ttl": "1h",
        "body_hash": "PLACEHOLDER_BODY_HASH",
        "pricing_mode": {
          "Fixed": {
            "gas_price_tolerance": 1
          }
        }
      },
      "payload": {
        "fields": {
          "initiator_addr": {
            "PublicKey": "01abcdef...123456"
          },
          "args": [
            [
              {}
            ]
          ],
          "target": "Native",
          "entry_point": "Transfer",
          "transaction_category": 0,
          "scheduling": "Standard"
        }
      },
      "approvals": [
        {
          "signer": "01abcdef...123456",
          "signature": "01abcd1234...5678"
        }
      ]
    }
  }
},
});

console.log(result);

const endpoint = "https://casper.nownodes.io/rpc";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({ jsonrpc: "2.0", method: "account_put_transaction", params: {
  "transaction": {
    "Version1": {
      "hash": "PLACEHOLDER_HASH",
      "header": {
        "chain_name": "casper",
        "timestamp": "2025-12-10T12:00:00.000Z",
        "ttl": "1h",
        "body_hash": "PLACEHOLDER_BODY_HASH",
        "pricing_mode": {
          "Fixed": {
            "gas_price_tolerance": 1
          }
        }
      },
      "payload": {
        "fields": {
          "initiator_addr": {
            "PublicKey": "01abcdef...123456"
          },
          "args": [
            [
              {}
            ]
          ],
          "target": "Native",
          "entry_point": "Transfer",
          "transaction_category": 0,
          "scheduling": "Standard"
        }
      },
      "approvals": [
        {
          "signer": "01abcdef...123456",
          "signature": "01abcd1234...5678"
        }
      ]
    }
  }
}, id: 1 });
console.log(result);

const response = await fetch('https://casper.nownodes.io/rpc', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "account_put_transaction",
      "params": {
        "transaction": {
          "Version1": {
            "hash": "PLACEHOLDER_HASH",
            "header": {
              "chain_name": "casper",
              "timestamp": "2025-12-10T12:00:00.000Z",
              "ttl": "1h",
              "body_hash": "PLACEHOLDER_BODY_HASH",
              "pricing_mode": {
                "Fixed": {
                  "gas_price_tolerance": 1
                }
              }
            },
            "payload": {
              "fields": {
                "initiator_addr": {
                  "PublicKey": "01abcdef...123456"
                },
                "args": [
                  [
                    {}
                  ]
                ],
                "target": "Native",
                "entry_point": "Transfer",
                "transaction_category": 0,
                "scheduling": "Standard"
              }
            },
            "approvals": [
              {
                "signer": "01abcdef...123456",
                "signature": "01abcd1234...5678"
              }
            ]
          }
        }
      }
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "account_put_transaction",
  "params": {
    "transaction": {
      "Version1": {
        "hash": "PLACEHOLDER_HASH",
        "header": {
          "chain_name": "casper",
          "timestamp": "2025-12-10T12:00:00.000Z",
          "ttl": "1h",
          "body_hash": "PLACEHOLDER_BODY_HASH",
          "pricing_mode": {
            "Fixed": {
              "gas_price_tolerance": 1
            }
          }
        },
        "payload": {
          "fields": {
            "initiator_addr": {
              "PublicKey": "01abcdef...123456"
            },
            "args": [
              [
                {}
              ]
            ],
            "target": "Native",
            "entry_point": "Transfer",
            "transaction_category": 0,
            "scheduling": "Standard"
          }
        },
        "approvals": [
          {
            "signer": "01abcdef...123456",
            "signature": "01abcd1234...5678"
          }
        ]
      }
    }
  }
}

response = requests.post('https://casper.nownodes.io/rpc', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://casper.nownodes.io/rpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "account_put_transaction",
    "params": {
      "transaction": {
        "Version1": {
          "hash": "PLACEHOLDER_HASH",
          "header": {
            "chain_name": "casper",
            "timestamp": "2025-12-10T12:00:00.000Z",
            "ttl": "1h",
            "body_hash": "PLACEHOLDER_BODY_HASH",
            "pricing_mode": {
              "Fixed": {
                "gas_price_tolerance": 1
              }
            }
          },
          "payload": {
            "fields": {
              "initiator_addr": {
                "PublicKey": "01abcdef...123456"
              },
              "args": [
                [
                  {}
                ]
              ],
              "target": "Native",
              "entry_point": "Transfer",
              "transaction_category": 0,
              "scheduling": "Standard"
            }
          },
          "approvals": [
            {
              "signer": "01abcdef...123456",
              "signature": "01abcd1234...5678"
            }
          ]
        }
      }
    }
  }'

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

Request Body

{
  "jsonrpc": "2.0",
  "method": "account_put_transaction",
  "params": {
    "transaction": {
      "Version1": {
        "hash": "PLACEHOLDER_HASH",
        "header": {
          "chain_name": "casper",
          "timestamp": "2025-12-10T12:00:00.000Z",
          "ttl": "1h",
          "body_hash": "PLACEHOLDER_BODY_HASH",
          "pricing_mode": {
            "Fixed": {
              "gas_price_tolerance": 1
            }
          }
        },
        "payload": {
          "fields": {
            "initiator_addr": {
              "PublicKey": "01abcdef...123456"
            },
            "args": [
              [
                {}
              ]
            ],
            "target": "Native",
            "entry_point": "Transfer",
            "transaction_category": 0,
            "scheduling": "Standard"
          }
        },
        "approvals": [
          {
            "signer": "01abcdef...123456",
            "signature": "01abcd1234...5678"
          }
        ]
      }
    }
  }
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "api_version": "2.0.0",
    "deploy_hash": "PLACEHOLDER_HASH"
  }
}

Documentation

How to migrate to NOWNodes

Authorizations

Body

Response