getmempoolancestors

POST

https://btc-testnet4.nownodes.io/

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Returns all in-mempool ancestor transactions for a given transaction ID. An ancestor is a transaction whose outputs are used as inputs in another transaction. You can get a summary or detailed object output.

Body

application/json

Request payload containing the documented method parameters and client request identifier.

jsonrpcstringrequired

JSON-RPC protocol version.

idstringrequired

Client-provided request identifier echoed in the response.

methodstringgetmempoolancestorsrequired

JSON-RPC method name.

paramsArray<string | boolean>required

Parameters:

txid (string, required) — Transaction ID to query.
verbose (boolean, optional) — Whether to return a JSON object or just an array of txids. Default is false.

Show child attributes

Single entry in the params array.

One of

JSON-RPC method parameters.

string

JSON-RPC method parameters.

boolean

Response

200OK

Ancestor transaction(s) retrieved successfully

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

getmempoolancestors

curl -X POST 'https://btc-testnet4.nownodes.io/' \
  -H 'Content-Type: application/json' \
  -d '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolancestors",
    "params": [
      "txid_example",
      true
    ]
  }'

import { JsonRpcProvider } from "ethers";

const provider = new JsonRpcProvider("https://btc-testnet4.nownodes.io/");
const result = await provider.send("getmempoolancestors", [
  "txid_example",
  true
]);
console.log(result);

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

uri = URI('https://btc-testnet4.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
  "jsonrpc": "2.0",
  "method": "getmempoolancestors",
  "params": [
    "txid_example",
    true
  ],
  "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://btc-testnet4.nownodes.io/"))
response = w3.provider.make_request("getmempoolancestors", [
  "txid_example",
  true
])
print(response)

import { createPublicClient, http } from "viem";

const client = createPublicClient({
  transport: http("https://btc-testnet4.nownodes.io/"),
});

const result = await client.request({
  method: "getmempoolancestors",
  params: [
  "txid_example",
  true
],
});

console.log(result);

const endpoint = "https://btc-testnet4.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: "getmempoolancestors", params: [
  "txid_example",
  true
], id: 1 });
console.log(result);

const response = await fetch('https://btc-testnet4.nownodes.io/', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
      "jsonrpc": "1.0",
      "id": "curltest",
      "method": "getmempoolancestors",
      "params": [
        "txid_example",
        true
      ]
    }),
});

const data = await response.json();

import requests

payload = {
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolancestors",
  "params": [
    "txid_example",
    true
  ]
}

response = requests.post('https://btc-testnet4.nownodes.io/', json=payload)
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://btc-testnet4.nownodes.io/')
request = Net::HTTP::Post.new(uri)
request['Content-Type'] = 'application/json'
request.body = '{
    "jsonrpc": "1.0",
    "id": "curltest",
    "method": "getmempoolancestors",
    "params": [
      "txid_example",
      true
    ]
  }'

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

Request Body

{
  "jsonrpc": "1.0",
  "id": "curltest",
  "method": "getmempoolancestors",
  "params": [
    "txid_example",
    true
  ]
}

{
  "result": {
    "c28bfec8d3707d83615393416fc7b4d6cb35be8da8426c7c64b6be60492cc676": {
      "vsize": 141,
      "weight": 561,
      "time": 1770000000,
      "height": 956047,
      "descendantcount": 1,
      "descendantsize": 141,
      "ancestorcount": 1,
      "ancestorsize": 141,
      "wtxid": "9f0c6c9d98f1d25f8b7d4e8c3a2b1f0e1234567890abcdef1234567890abcdef",
      "fees": {
        "base": 0.0000141,
        "modified": 0.0000141,
        "ancestor": 0.0000141,
        "descendant": 0.0000141
      },
      "depends": [],
      "spentby": [],
      "bip125-replaceable": false,
      "unbroadcast": false
    }
  },
  "error": null,
  "id": 1
}

{
  "result": null,
  "error": {
    "code": -3,
    "message": "Invalid parameter"
  },
  "id": 1
}

Unknown API_key

Method Not Allowed

Missing API_key

{
  "result": {
    "c28bfec8d3707d83615393416fc7b4d6cb35be8da8426c7c64b6be60492cc676": {
      "vsize": 141,
      "weight": 561,
      "time": 1770000000,
      "height": 956047,
      "descendantcount": 1,
      "descendantsize": 141,
      "ancestorcount": 1,
      "ancestorsize": 141,
      "wtxid": "9f0c6c9d98f1d25f8b7d4e8c3a2b1f0e1234567890abcdef1234567890abcdef",
      "fees": {
        "base": 0.0000141,
        "modified": 0.0000141,
        "ancestor": 0.0000141,
        "descendant": 0.0000141
      },
      "depends": [],
      "spentby": [],
      "bip125-replaceable": false,
      "unbroadcast": false
    }
  },
  "error": {
    "code": -28,
    "message": "Service temporarily unavailable"
  },
  "id": "curltest"
}

Documentation

How to migrate to NOWNodes

getmempoolancestors

Authorizations

Body

Response