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Bitcoin Blockchain
Data Indexing API

Bitcoin Quick Facts

The Bitcoin blockchain is the first blockchain that was created and it serves as the backbone of the Bitcoin network.

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
btc-mainnet
Chain ID
20090103
Block explorer
Blocktime600 seconds
Historical balances✅
NFT assets and metadata❌
Query via SQL on Increment✅

Mainnet

Chain name
btc-mainnet
Chain ID
20090103
Block explorer
Blocktime600 seconds
Historical balances✅
NFT assets and metadata❌
Query via SQL on Increment✅

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Supported Endpoints

Get token balances for address
Get historical token balances for address
Get transactions by wallet 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);
}