Get Transaction State in Mempool

POST

https://ont.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Checks whether a specific transaction exists in the node's unconfirmed transaction pool (mempool) and returns its current processing state. Useful for tracking transaction status before confirmation.

Body

application/json

jsonrpcstringrequired

The JSON-RPC protocol version. Must be "2.0" per JSON-RPC 2.0 specification.

methodstringrequired

The RPC method name. Must be "getmempooltxstate" for this operation.

paramsArray<string>required

Array with one parameter: transaction ID (hash) in hexadecimal format to check in mempool.

idintegerrequired

Unique client-generated request ID to correlate responses with requests.

Response

200OK

Successful response with transaction state in mempool.

Get Transaction State in Mempool

curl -X POST 'https://ont.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "getmempooltxstate",
    "params": [
      "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
    ],
    "id": 1
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://ont.nownodes.io/");
const result = await provider.send("getmempooltxstate", [
  "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
]);
console.log(result);

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

uri = URI('https://ont.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "getmempooltxstate",
  "params": [
    "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
  ],
  "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://ont.nownodes.io/"))
response = w3.provider.make_request("getmempooltxstate", [
  "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "getmempooltxstate",
  params: [
  "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
],
});

console.log(result);

const endpoint = "https://ont.nownodes.io/";
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: "getmempooltxstate", params: [
  "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
], id: 1 });
console.log(result);

const response = await fetch('https://ont.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "getmempooltxstate",
      "params": [
        "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "getmempooltxstate",
  "params": [
    "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
  ],
  "id": 1
}

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

require 'net/http'
require 'json'

uri = URI('https://ont.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "getmempooltxstate",
    "params": [
      "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
    ],
    "id": 1
  }'

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": "getmempooltxstate",
  "params": [
    "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a"
  ],
  "id": 1
}

200

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": {
    "Hash": "0xf4250dab094c38d8265acc15c366dc508d2e14bf5699e12d9df26577ed0d212a",
    "State": 0
  }
}

Documentation

How to migrate to NOWNodes

Get Transaction State in Mempool

Authorizations

Body

Response