Bitcoin Blockchain
Data Indexing API
Bitcoin Blockchain
Data Indexing API
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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=csvis 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_KEYAppend 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.
Mainnet
Supported Endpoints
Code Samples
Get token balances for address
/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:
Processing:
npm install @covalenthq/client-sdk
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);
}
