Avalanche C-Chain Onchain Data API

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.

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

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

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

Block Explorer API

Internal Transactions (`with-internal`)

Avalanche C-Chain supports internal transactions (traces). The Transactions API endpoints marked with-traces above accept the with-internal=true query parameter, which includes internal transactions (the value transfers triggered by contract execution that are not recorded as standalone onchain transactions) in the response.

Internal transactions are included in the response by passing with-internal and cost 0.05 credits/item.

Example API Call

Recent transactions with internal transactions

curl -X GET "https://api.covalenthq.com/v1/avalanche-mainnet/address/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/transactions_v3/?with-internal=true&key=<GOLDRUSH_API_KEY>"

Overview

Popular Chains 🔥

Foundational Chains

Frontier Chains

Community Chains

Archived Chains

Overview

Supported APIs

Foundational API

Mainnet

Testnet

API Usage

Chain Name

Example API Calls

SDK Usage

Foundational API Support

Wallet API

Pricing API

Security API

Transactions API

Block Explorer API

Internal Transactions (`with-internal`)

Example API Call

Additional Resources

​Overview

​Supported APIs

Foundational API

​Mainnet

​Testnet

​API Usage

​Chain Name

​Example API Calls

​SDK Usage

​Foundational API Support

​Wallet API

​Pricing API

​Security API

​Transactions API

​Block Explorer API

​Internal Transactions (with-internal)

​Example API Call

​Additional Resources

Overview

Supported APIs

Mainnet

Testnet

API Usage

Chain Name

Example API Calls

SDK Usage

Foundational API Support

Wallet API

Pricing API

Security API

Transactions API

Block Explorer API

Internal Transactions (`with-internal`)

Example API Call

Additional Resources