Get Filter Changes

POST

https://trx.nownodes.io/jsonrpc

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Returns an array of logs that occurred since the last poll for the specified filter ID. The filter must have been previously created with eth_newFilter or eth_newBlockFilter or eth_newPendingTransactionFilter.

Body

application/json

Request value.

jsonrpcstringrequired

JSON-RPC version.

methodstringrequired

JSON-RPC method name.

paramsArray<string>required

Parameters array with a single element:

The filter ID (hex string).

idintegerrequired

Request identifier.

Response

200OK

HTTP 200 response for eth_getFilterChanges. The body contains either a successful result or a node-level error.

400Bad Request

Bad Request. The request is malformed or contains invalid parameters.

401Unauthorized

Unauthorized: API key is present but rejected by the NOWNodes gateway.

405Method Not Allowed

Method Not Allowed. Returned by the NOWNodes gateway for malformed or unsupported gateway-level requests.

422Unprocessable Entity

Missing API key. The NOWNodes gateway returns plain text for this error.

500Internal Server Error

Internal Server Error. The gateway or node failed while processing the request.

Get Filter Changes

curl -X POST 'https://trx.nownodes.io/jsonrpc' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": [
      "0x16"
    ],
    "id": 1
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://trx.nownodes.io/jsonrpc");
const result = await provider.send("eth_getFilterChanges", [
  "0x16"
]);
console.log(result);

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

uri = URI('https://trx.nownodes.io/jsonrpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "eth_getFilterChanges",
  "params": [
    "0x16"
  ],
  "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://trx.nownodes.io/jsonrpc"))
response = w3.provider.make_request("eth_getFilterChanges", [
  "0x16"
])
print(response)

import { createPublicClient, http } from "viem";

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

const result = await client.request({
  method: "eth_getFilterChanges",
  params: [
  "0x16"
],
});

console.log(result);

const endpoint = "https://trx.nownodes.io/jsonrpc";
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: "eth_getFilterChanges", params: [
  "0x16"
], id: 1 });
console.log(result);

const response = await fetch('https://trx.nownodes.io/jsonrpc', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "2.0",
      "method": "eth_getFilterChanges",
      "params": [
        "0x16"
      ],
      "id": 1
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "2.0",
  "method": "eth_getFilterChanges",
  "params": [
    "0x16"
  ],
  "id": 1
}

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

require 'net/http'
require 'json'

uri = URI('https://trx.nownodes.io/jsonrpc')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "2.0",
    "method": "eth_getFilterChanges",
    "params": [
      "0x16"
    ],
    "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": "eth_getFilterChanges",
  "params": [
    "0x16"
  ],
  "id": 1
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": []
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "error": {
    "code": -32602,
    "message": "invalid argument 0: invalid parameter for eth_getFilterChanges"
  }
}

{
  "code": 400,
  "message": "Bad Request"
}

Unknown API_key

Method Not Allowed

Missing API_key

{
  "code": 500,
  "message": "Internal Server Error"
}

Documentation

How to migrate to NOWNodes

Get Filter Changes

Authorizations

Body

Response