Create a new log filter

POST

https://vinu.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Creates a filter that collects logs matching the given criteria. Poll it with eth_getFilterChanges for logs seen since the previous poll, or read the full matching set with eth_getFilterLogs. Remove it with eth_uninstallFilter when you are done.

The returned id is a 16-byte hex string with leading zeros stripped, so it is not always 34 characters long - treat it as an opaque string and do not left-pad or normalise it.

Requests to this endpoint are balanced across a pool of nodes, and a filter is only visible to the node that created it. For anything that must be reliable, poll with an explicit block range instead of a filter.

Changed in the 29 August 2026 network upgrade. Reading this filter back through eth_getFilterLogs is capped at 100 000 blocks when it carries address and/or topics, down from no practical limit.

Body

application/json

jsonrpcstringrequired

methodstringrequired

paramsArray<object>required

Array with one object describing the filter options.

Show child attributes

fromBlockstring

Starting block number or tag ("latest", "earliest", "pending").

toBlockstring

Ending block number or tag.

addressstring | Array<string> | null

topicsArray<string | Array<string>> | null

Array of topic filters. Topics are 32-byte hashes identifying events.

Show child attributes

One of

string

Array<string>

idintegerrequired

Response

200OK

Filter ID created successfully

405Method Not Allowed

Method not served by this endpoint. The body is the plain-text string Method Not Allowed, not JSON.

422Unprocessable Entity

Missing API key - the api-key header was absent. The body is the plain-text string Missing API_key, not JSON.

Create a new log filter

curl -X POST 'https://vinu.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -H 'api-key: YOUR_API_KEY' \
  -d '{"jsonrpc": "2.0", "method": "eth_newFilter", "params": [{"fromBlock": "latest", "toBlock": "latest", "address": "0xfc00face00000000000000000000000000000000"}], "id": 1}'

import { FetchRequest, JsonRpcProvider } from "ethers";

const request = new FetchRequest("https://vinu.nownodes.io/");
request.setHeader("api-key", "YOUR_API_KEY");

const provider = new JsonRpcProvider(request);
const result = await provider.send("eth_newFilter", [{"fromBlock": "latest", "toBlock": "latest", "address": "0xfc00face00000000000000000000000000000000"}]);
console.log(result);

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

uri = URI('https://vinu.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['api-key'] = 'YOUR_API_KEY'
request.body = '{"jsonrpc": "2.0", "method": "eth_newFilter", "params": [{"fromBlock": "latest", "toBlock": "latest", "address": "0xfc00face00000000000000000000000000000000"}], "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://vinu.nownodes.io/",
    request_kwargs={"headers": {"api-key": "YOUR_API_KEY"}},
))

response = w3.provider.make_request("eth_newFilter", [
    {
        "fromBlock": "latest",
        "toBlock": "latest",
        "address": "0xfc00face00000000000000000000000000000000",
    },
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://vinu.nownodes.io/", {
    fetchOptions: { headers: { "api-key": "YOUR_API_KEY" } },
  }),
});

const result = await client.request({
  method: "eth_newFilter",
  params: [{"fromBlock": "latest", "toBlock": "latest", "address": "0xfc00face00000000000000000000000000000000"}],
});

console.log(result);

const endpoint = "https://vinu.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: "eth_newFilter", params: [
  {
    "fromBlock": "latest",
    "toBlock": "latest",
    "address": "0xfc00face00000000000000000000000000000000"
  }
], id: 1 });
console.log(result);

const response = await fetch('https://vinu.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'api-key': 'YOUR_API_KEY',
  },
  body: JSON.stringify({
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [
      {
        "fromBlock": "latest",
        "toBlock": "latest",
        "address": "0xfc00face00000000000000000000000000000000"
      }
    ],
    "id": 1
  }),
});

const data = await response.json();

import requests

payload = {
    "jsonrpc": "2.0",
    "method": "eth_newFilter",
    "params": [
        {
            "fromBlock": "latest",
            "toBlock": "latest",
            "address": "0xfc00face00000000000000000000000000000000",
        },
    ],
    "id": 1,
}

response = requests.post(
    "https://vinu.nownodes.io/",
    json=payload,
    headers={"api-key": "YOUR_API_KEY"},
)

print(response.json())

require 'net/http'
require 'json'

uri = URI('https://vinu.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request['api-key'] = 'YOUR_API_KEY'
request.body = '{"jsonrpc": "2.0", "method": "eth_newFilter", "params": [{"fromBlock": "latest", "toBlock": "latest", "address": "0xfc00face00000000000000000000000000000000"}], "id": 1}'

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

puts JSON.parse(response.body)

Request Body

{
  "jsonrpc": "2.0",
  "method": "eth_newFilter",
  "params": [
    {
      "fromBlock": "latest",
      "toBlock": "latest",
      "address": "0xfc00face00000000000000000000000000000000"
    }
  ],
  "id": 1
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": "0x16"
}

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

Method Not Allowed

Missing API_key