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Ethereum Blockchain
Data Indexing API

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Unified API Developer Docs

Tutorials, guides and references on the Unified API.

Unified API Reference

Complete reference documentation for the Unified API.

Developer SDK

Official open-source client libraries for your favorite platforms.

FAQ

These FAQs are a self-serve support resource for the Covalent API.

Base URL

The API Host for all requests is https://api.covalenthq.com/v1. Some additional points to keep in mind:

  • All requests are done over HTTPS (calls over plain HTTP will fail.)
  • The default return format for all endpoints is JSON unless the query parameter format=csv is specified.
  • All requests require authentication.

Authentication

To access the Covalent API, you will need an API key. Various authentication mechanisms are available:

Authentication via Query parameter

curl -X GET https://api.covalenthq.com/v1/ENDPOINT/?key=API_KEY

Append key=API_KEY as a query parameter to all requests.

Authentication via Basic Auth

 curl -X GET https://api.covalenthq.com/v1/ENDPOINT/ \
                -u API_KEY:
                -H 'Content-Type: application/json'
                # The colon prevents curl from asking for a password.

Provide your API key as the basic auth username. You do not need to provide a password.

Chain name
eth-mainnet
Chain ID
1
Block explorer
Blocktime12 seconds
Historical balances✅
NFT assets and metadata✅
Query via SQL on Increment✅

Mainnet

Chain name
eth-mainnet
Chain ID
1
Block explorer
Blocktime12 seconds
Historical balances✅
NFT assets and metadata✅
Query via SQL on Increment✅

Ethereum Goerli Testnet

Chain name
eth-goerli
Chain ID
5
Block explorer
Blocktime15 seconds
Historical balances❌
NFT assets and metadata❌
Query via SQL on Increment✅

Sepolia Testnet

Chain name
eth-sepolia
Chain ID
11155111
Block explorer
Blocktime8 seconds
Historical balances❌
NFT assets and metadata❌
Query via SQL on Increment❌

Holesky Testnet

Chain name
eth-holesky
Chain ID
17000
Block explorer
Blocktime12 seconds
Historical balances❌
NFT assets and metadata❌
Query via SQL on Increment✅

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Network Status

Monthly Active Wallets
Unique wallets who transact on a monthly basis.		---
Transactions
Unique transactions on a monthly basis.		---
Active Tokens
Unique tokens active on a monthly basis.		---
Powered by Increment.

Monthly

Monthly Active Wallets
Unique wallets who transact on a monthly basis.		---
Transactions
Unique transactions on a monthly basis.		---
Active Tokens
Unique tokens active on a monthly basis.		---
Powered by Increment.

Weekly

Weekly Active Wallets
Unique wallets who transact on a weekly basis.		---
Transactions
Unique transactions on a weekly basis.		---
Active Tokens
Unique tokens active on a weekly basis.		---
Powered by Increment.

Daily

Daily Active Wallets
Unique wallets who transact on a daily basis.		---
Transactions
Unique transactions on a daily basis.		---
Active Tokens
Unique tokens active on a daily basis.		---
Powered by Increment.

Yearly

Yearly Active Wallets
Unique wallets who transact on a yearly basis.		---
Transactions
Unique transactions on a yearly basis.		---
Active Tokens
Unique tokens active on a yearly basis.		---
Powered by Increment.

Supported Endpoints

Get token approvals for address
Get NFT approvals for address
Get token balances for address
Get historical portfolio value over time
Get ERC20 token transfers for address
Get token holders as of any block height (v2)
Get historical token balances for address
Get native token balance for address
Get a block
Get resolved address for registered address
Get block heights
Get logs
Get log events by contract address
Get log events by topic hash(es)
Get chain collections
Get NFTs for address
Get NFTs from contract with metadata
Get single NFT with cached metadata from contract
Get NFT transactions for contract
Get traits for a collection
Get attributes for a collection trait
Get trait summary for collection
Check ownership in NFT collection
Check ownership in NFT collection for specific token
Get historical sales count for a collection
Get historical volume for a collection
Get historical floor prices for a collection
Get historical token prices
Get a transaction
Get recent transactions for address (v3)
Get paginated transactions for address (v3)
Get bulk time bucket transactions for address (v3)
Get earliest transactions for address (v3)
Get all transactions in a block by page (v3)
Get all transactions in a block (v3)
Get transaction summary for address

Code Samples

Get token balances for address

GET/v1/{chainName}/address/{walletAddress}/balances_v2/

Commonly used to fetch the native, fungible (ERC20), and non-fungible (ERC721 & ERC1155) tokens held by an address. Response includes spot prices and other metadata.

Costs:

1.00 Credits

Processing:

Realtime
Show Guides
Installation
npm install @covalenthq/client-sdk
Request
import { CovalentClient } from "@covalenthq/client-sdk";

const ApiServices = async () => {
    const client = new CovalentClient("YOUR_API_KEY");
    const resp = await client.BalanceService.getTokenBalancesForWalletAddress();
    console.log(resp.data);
}