Avalanche C-Chain Onchain Data API

Get token balances and transactions for Avalanche C-Chain. 23 endpoints supported. Testnet supported.

Overview

Avalanche is an open-source platform for launching decentralized applications and enterprise blockchain deployments in one interoperable, highly scalable ecosystem. Avalanche is the first smart contracts platform that processes 4,500+ transactions/second and instantly confirms transactions. Ethereum developers can quickly build on Avalanche as Solidity works out-of-the-box. A key difference between Avalanche and other decentralized networks is the consensus protocol. Over time, people have come to a false understanding that blockchains have to be slow and not scalable. The Avalanche protocol employs a novel approach to consensus to achieve its strong safety guarantees, quick finality, and high-throughput, without compromising decentralization.

GoldRush offers the most comprehensive Avalanche C-Chain Data API suite for developers, analysts, and enterprises. Whether you’re building a DeFi dashboard, a wallet, a trading bot, an AI agent or a compliance platform, our Avalanche C-Chain Data APIs provide fast, accurate, and developer-friendly access to the essential onchain data you need.

Supported APIs

Foundational API

Access structured historical blockchain data across 100+ chains using REST APIs. Get token balances, transaction histories, decoded event logs, NFT assets, token holders and more.

Use cases: Wallets, portfolio trackers, crypto accounting & tax tools, and DeFi dashboards.

Read docs

Pipeline API

Stream blockchain data directly to your own infrastructure. Push decoded blocks, transactions, event logs, and protocol-specific data into your database, warehouse, queue, or webhook with ABI decoding and SQL transforms built in.

Use cases: Data warehousing, analytics dashboards, ETL pipelines, and backend indexing.

Read docs

Mainnet

Property	Value
Chain Name	avalanche-mainnet
Chain ID	43114
Network Type	Frontier Chain
Support Level	frontier
Block Explorer	Explorer
Official Website	Avalanche C-Chain Website
Native Gas Token	AVAX

Testnet

Property	Value
Chain Name	avalanche-testnet
Chain ID	43113
Purpose	Development and testing network
Support Level	frontier
Block Explorer	Explorer
Native Gas Token	AVAX

API Usage

To use this blockchain network in GoldRush API calls, use:

Chain Name

• avalanche-mainnet (mainnet)
• avalanche-testnet (testnet)

Example API Calls

Chain Name (Mainnet)

curl -X GET "https://api.covalenthq.com/v1/avalanche-mainnet/address/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances_v2/?key=<GOLDRUSH_API_KEY>"

curl -X GET "https://api.covalenthq.com/v1/avalanche-testnet/address/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances_v2/?key=<GOLDRUSH_API_KEY>"

SDK Usage

TypeScript SDK (Mainnet)

import { GoldRushClient } from "@covalenthq/client-sdk";

const client = new GoldRushClient("<GOLDRUSH_API_KEY>");
const resp = await client.BalanceService.getTokenBalancesForWalletAddress({
    chainName: "avalanche-mainnet",
    walletAddress: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
});

import { GoldRushClient } from "@covalenthq/client-sdk";

const client = new GoldRushClient("<GOLDRUSH_API_KEY>");
const resp = await client.BalanceService.getTokenBalancesForWalletAddress({
    chainName: "avalanche-testnet",
    walletAddress: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
});

Foundational API Support

This chain supports 23 GoldRush Foundational APIs:

Wallet API

• Get token holders as of any block height (v2) on Avalanche C-Chain
• Get token balances for address on Avalanche C-Chain
• Get native token balance for address on Avalanche C-Chain
• Get historical portfolio value over time on Avalanche C-Chain
• Get ERC20 token transfers for address on Avalanche C-Chain

Pricing API

• Get historical token prices on Avalanche C-Chain

Security API

• Get token approvals for address on Avalanche C-Chain

Transactions API

• Get a transaction on Avalanche C-Chain with-traces
• Get transaction summary for address on Avalanche C-Chain
• Get earliest transactions for address (v3) on Avalanche C-Chain with-traces
• Get recent transactions for address (v3) on Avalanche C-Chain with-traces
• Get paginated transactions for address (v3) on Avalanche C-Chain with-traces
• Get bulk time bucket transactions for address (v3) on Avalanche C-Chain
• Get all transactions in a block (v3) on Avalanche C-Chain
• Get all transactions in a block by page (v3) on Avalanche C-Chain

Block Explorer API

• Get a block on Avalanche C-Chain
• Get all chain statuses on Avalanche C-Chain
• Get all chains on Avalanche C-Chain
• Get block heights on Avalanche C-Chain
• Get gas prices on Avalanche C-Chain
• Get log events by contract address on Avalanche C-Chain
• Get log events by topic hash(es) on Avalanche C-Chain
• Get logs on Avalanche C-Chain

Pipeline API Support

This chain supports 4 GoldRush Pipeline API data objects that can be streamed to your infrastructure:

• Blocks
• Transactions
• Logs
• Transfers

Additional Resources

• GoldRush API Documentation
• Supported Chains List
• API Reference