Covalent

Covalent provides a unified API to bring full transparency and visibility to assets across all blockchain networks including Blockchain.

To get started, sign up for an API Key.

Developer Mode (JSON)	Analyst Mode (CSV)

The Covalent API is RESTful and offers the following out-of-the-box for Blockchain:

Try the supported endpoints directly in your browser from our API Reference or use the following code examples. The JSON response format is the same for all endpoints:

❴
    "data": ..., 
    "error": false,
    "error_message": null,
    "error_code": null
❵

Curl

 
curl -X GET "https://api.covalenthq.com/v1/1/address/0xFEC4f9D5B322Aa834056E85946A32c35A3f5aDD8/balances_v2/?key={YOUR API KEY}" -H "Accept: application/json"

JavaScript

const APIKEY = 'YOUR API KEY';
const baseURL = 'https://api.covalenthq.com/v1'
const blockchainId = 1
const demoAddress = '0xFEC4f9D5B322Aa834056E85946A32c35A3f5aDD8'

async function getWalletBalance(chainId, address) {
    const url = new URL(`${baseURL}/${chainId}/address/${address}/balances_v2/?key=${APIKEY}`);
    const response = await fetch(url);
    const result = await response.json();
    const data = result.data;
    console.log(data)
    return data;
}

// Example address request
getWalletBalance(blockchainId, demoAddress);

Python

import requests
API_KEY = 'YOUR API KEY'
base_url = 'https://api.covalenthq.com/v1'
blockchain_id = 1
demo_address = '0xFEC4f9D5B322Aa834056E85946A32c35A3f5aDD8'

def get_wallet_balance(chain_id, address):
    endpoint = f'/{chain_id}/address/{address}/balances_v2/?key={API_KEY}'
    url = base_url + endpoint
    result = requests.get(url).json()
    data = result["data"]
    print(data)
    return(data)


# Example address request
get_wallet_balance(blockchain_id, demo_address)

Use Cases

The Covalent API supports a broad range of Web3 data use cases including:

Gaming	DeFi Taxes	KYC	NFTs
Wallets	Dashboards	On-Chain Forensics	DAO Data
DEXs & Trading	Predictive Analytics	Governance	Pricing

Check out our collection of ready-to-ship Code Templates that you can use to build your Web3 data-powered dApps.

Resources

Here are some additional resources to help you get started with the Covalent API:

• Blockchain Network Details
• Project Showcase
• Covalent API Reference
• API FAQs
• Discord Support

About Covalent

Covalent provides the industry-leading Unified API bringing visibility to billions of Web3 data points. Developers use Covalent to build exciting multi-chain applications like crypto wallets, NFT galleries, and investor dashboard tools utilizing data from 40+ blockchains. Covalent is trusted by a community of 35,000+ developers and powers data for 3000+ applications including 0x, Zerion, Rainbow Wallet, Rotki, Bitski and many others.

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