Get contract metadata.

GET

https://maticbook.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: single-contract lookup endpoint /api/v2/contract/{contract}, so clients can refresh ERC-4626 vault data (protocols=erc4626) and fiat pricing without reloading full account info. The endpoint did not exist in 0.5.0. EVM chains only - applicable on Polygon.

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.

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 Polygon Blockbook response for getContractInfo.

400Bad Request

Domain or validation error. JSON body {"error": "..."}.

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.

500Internal Server Error

Internal Server Error. JSON body {"error":"Internal server error"}.

Get contract metadata.

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

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

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://maticbook.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://maticbook.nownodes.io/api/v2/contract/{contract}')
data = response.json()

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

const data = await response.json();

const endpoint = "https://maticbook.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://maticbook.nownodes.io/api/v2/contract/{contract}', {
  method: 'GET',
});

const data = await response.json();

import requests

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

require 'net/http'
require 'json'

uri = URI('https://maticbook.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": "0x0000000000000000000000000000000000000001",
  "name": "Vault Share",
  "symbol": "vETH",
  "decimals": 18,
  "rates": {
    "baseRate": 0.000523,
    "currency": "usd",
    "secondaryRate": 1.24
  },
  "protocols": {
    "erc4626": {
      "asset": {
        "contract": "0x0000000000000000000000000000000000000002",
        "name": "Wrapped Ether",
        "symbol": "WETH",
        "decimals": 18
      },
      "share": {
        "contract": "0x0000000000000000000000000000000000000001",
        "name": "Vault Share",
        "symbol": "vETH",
        "decimals": 18
      },
      "totalAssets": "123456789",
      "convertToAssets1Share": "1000000000000000000",
      "convertToShares1Asset": "1000000000000000000",
      "previewDeposit1Asset": "999999999999999999",
      "previewRedeem1Share": "1000000000000000000"
    }
  },
  "blockHeight": 12345678
}

{
  "error": "Contract not found"
}

{
  "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