Get contract metadata.

GET

https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Added in Blockbook v0.6.0 (PR #1477): single-contract lookup endpoint /api/v2/contract/{contract}, so clients can refresh ERC-4626 vault data (protocols=erc4626, PRs #1431/#1502) and fiat pricing without reloading full account info. The endpoint did not exist in 0.5.0. EVM chains only - applicable on EthereumPoW. Live-verified on the ETHW gateway, which load-balances two pre-0.6.0 builds: the newer instance (devel 039346c, built 2026-05-30) answers real indexed ERC20 metadata (the Tether USD contract captured live), while the dominant 2022 build (devel 89431f5) does not route the path and falls through to the /api/ index handler, returning the status body (observed for ~11 of 12 consecutive calls).

Returns indexed token/contract metadata and optional current protocol enrichments such as ERC4626.

blockHeight reflects the indexer's best block at request time. ERC4626 fields under protocols.erc4626 are fetched through JSON-RPC calls pinned to that exact blockHeight, so the ERC4626 values are a consistent snapshot. If a vault is detected but the underlying asset metadata cannot be resolved, protocols.erc4626 contains error and omits asset; callers must not derive fiat rates or human-unit exchange rates from such a partial response.

Load estimate: Medium; indexed metadata is cheap, but optional protocol enrichment can add backend RPC calls and token metadata lookups.

live-verified behavior:

Blockbook 0.6.0 endpoint (EVM chains only; applicable on EthereumPoW). Live on the deployed pre-0.6.0 build: the path falls through to the /api/ index handler and returns the status body.

Parameters

contractstringrequiredpath

Smart contract address.

currencystringquery

Secondary currency code for rates.

protocolsArray<string>query

Optional protocol enrichments, comma-separated or repeated.

Response

200OK

HTTP 200 EthereumPoW Blockbook response for getContractInfo.

400Bad Request

Domain or validation error. live-verified: JSON body {"error": "..."} (unknown block/transaction, invalid address, malformed broadcast hex, missing filter parameters).

401Unauthorized

Unauthorized: missing or invalid api-key header. The NOWNodes gateway returns the plain-text body "Unknown API_key".

405Method Not Allowed

Method Not Allowed: gateway-level response for unknown routes (and for the v1 GET broadcast route on this instance).

500Internal Server Error

Internal Server Error. live-verified on the deployed instance: JSON body {"error":"Internal server error"} (observed on /api/rawtx and invalid XPUB lookups).

Get contract metadata.

curl -X GET 'https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}'

const response = await fetch('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}', {
  method: 'GET',
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}')
request = Net::HTTP::Get.new(uri)

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

import requests

response = requests.get('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}')
data = response.json()

const response = await fetch('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}', {
  method: 'GET',
});

const data = await response.json();

const endpoint = "https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}";
const apiKey = "YOUR_API_KEY";

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

  return response.json();
}

const result = await nownodesRequest({});
console.log(result);

const response = await fetch('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}', {
  method: 'GET',
});

const data = await response.json();

import requests

response = requests.get('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}')
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://ethw-blockbook.nownodes.io/api/v2/contract/{contract}')
request = Net::HTTP::Get.new(uri)

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

{
  "type": "ERC20",
  "standard": "ERC20",
  "contract": "0xdAC17F958D2ee523a2206206994597C13D831ec7",
  "name": "Tether USD",
  "symbol": "USDT",
  "decimals": 6,
  "blockHeight": 24975130
}

{
  "error": "Contract not found"
}

{
  "blockbook": {
    "coin": "Ethereum PoW",
    "host": "1e4485eb5a6f",
    "version": "devel",
    "gitCommit": "89431f5",
    "buildTime": "2022-09-16T11:21:44+00:00",
    "syncMode": true,
    "initialSync": false,
    "inSync": true,
    "bestHeight": 24975124,
    "lastBlockTime": "2026-09-01T18:20:55.114820285Z",
    "inSyncMempool": true,
    "lastMempoolTime": "2026-09-01T18:20:11.137064755Z",
    "mempoolSize": 11,
    "decimals": 18,
    "dbSize": 281969362509,
    "about": "Blockbook - blockchain indexer for Trezor wallet https://trezor.io/. Do not use for any other purpose."
  },
  "backend": {
    "chain": "mainnet",
    "blocks": 24975124,
    "bestBlockHash": "0x73e34bc8810177be2323c7eae29b48aa12d506eb208c3a26f112120661cff4c5",
    "difficulty": "27188762399451",
    "version": "Geth/v1.10.23-stable-f78489ad/linux-amd64/go1.19"
  }
}

{
  "error": "Contract not found"
}

Unknown API_key

Method Not Allowed

{
  "error": "Internal server error"
}

Documentation

How to migrate to NOWNodes

Get contract metadata.

Authorizations

Parameters

Response