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

Ethereum is a technology that's home to digital money, global payments, and applications. The community has built a booming digital economy, bold new ways for creators to earn online, and so much more. It's open to everyone, wherever you are in the world – all you need is the internet.

With over 1.3 billion transactions recorded, 130 million unique wallets and ~2.7 million monthly active users, Polygon Proof of Stake (POS) is the most proven scaling solution in web3, and the best way to launch a web3 project that's ready for a global audience.

BNB Smart Chain (BSC) is best described as a blockchain that runs in parallel to the Binance Chain, boasting smart contract functionality and compatibility with the Ethereum Virtual Machine (EVM). The design goal here was to leave the high throughput of Binance Chain intact while introducing smart contracts into its ecosystem.

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.

Fantom is a fast, high-throughput open-source smart contract platform for digital assets and dApps. Founded in 2018, Fantom is designed to overcome the limitations of previous-generation blockchain platforms. Fantom is permissionless, decentralized, and open-source while achieving fast finality (1-2 second transaction confirmation) and low fees ($0.00001). Furthermore, Fantom is EVM-compatible. Fantom code is completely open source. Anyone can read it, check on the progress, comment on it, and contribute. Fantom integrates industry-leaders oracle providers Chainlink and Band Protocol for maximum flexibility to access price feeds.

Moonbeam is an Ethereum-compatible smart contract parachain on Polkadot.  Moonbeam is much more than just an EVM implementation: it’s a highly specialized Layer 1.5 chain that mirrors Ethereum’s Web3 RPC, accounts, keys, subscriptions, logs, and more. The Moonbeam platform extends the base Ethereum feature set with additional features such as on-chain governance, staking, and cross-chain integrations.

Moonriver is an Ethereum-compatible Solidity Smart Contracts Parachain on Kusama.  Moonriver is a companion network to Moonbeam and provides a permanently incentivized canary network. New code ships to Moonriver first, where it can be tested and verified under real economic conditions. Once proven, the same code ships to Moonbeam on Polkadot. Moonriver is a Community-Led Sister Parachain on Kusama.

Rootstock takes the security and resilience of Bitcoin and introduces smart contract functionality. The most resilient blockchain ecosystem working side by side with the world’s most secure smart contract network.

Arbitrum is an L2 scaling solution for Ethereum. It is a suite of Ethereum scaling solutions that enables high-throughput, low cost smart contracts while remaining trustlessly secure. Arbitrum has security rooted in Ethereum, with any one party able to ensure correct Layer 2 results. Arbitrum is also able to run unmodified EVM contracts and unmodified Ethereum transactions. Moving contract computation and storage off of the main Ethereum chain allows for much higher throughput. Designed and engineered to minimize the L1 gas footprint of the system, Arbitrum minimizes per-transaction cost.

Palm is a new NFT ecosystem for Culture and Creativity, built efficiently with Ethereum. Palm NFT Studio collaborates with creatives, artists, marketplaces, and rights holders to bring projects and platforms into the Palm ecosystem. Together, with some of the biggest names in fine art, cryptoart, and entertainment, Palm is building a new creative studio and NFT ecosystem on Ethereum that is both scalable and sustainable. Creators using the Palm ecosystem will benefit from super low gas fees, and the Palm ecosystem will reward both creators and participants. The Palm ecosystem was designed from the ground up to be as flexible as artists are creative.

The Klaytn Network is a global public blockchain platform developed by Ground X, the blockchain affiliate of the leading South Korean Internet company, Kakao. Klaytn is a service-centric blockchain platform providing an intuitive development environment and friendly end-user experience. It is built upon solid reliability and significant stability with substantial service development for mass adoption. The platform allows real-world applications of large scale to be produced right away so that our end-users can make full use of services without much expertise in blockchain or cryptocurrency.

Huobi ECO, HECO Network is a decentralized and cost efficient public chain that Ethereum developers can easily get started with and smart contracts are seamlessly compatible.

Godwoken is an L2 network running on the Nervos blockchain. It is an Ethereum-compatible layer inside of an optimistic rollup, which allows for low cost, high speed transactions with a familiar user and developer experience.

Ronin is an Ethereum-linked side-chain made specifically for Axie Infinity, a Pokémon-inspired universe where anyone can earn tokens through skilled gameplay and contributions to the ecosystem.

Evmos is a scalable and interoperable Ethereum compatible network. It is built on the consensus mechanism of Proof-of-Stake with fast-finality. Evmos is an application-agnostic Cosmos chain that will be interoperable with the Ethereum mainnet, and Ethereum Virtual Machine (EVM) compatible environments, and other Byzantine Fault Tolerance (BFT) chains via Inter-Blockchain Communication (IBC), making it easy for users and developers to interact seamlessly between chains. Evmos aims to be the EVM Hub of Cosmos, making it easy for smart contracts to deploy and communicate within the Cosmos ecosystem.

Astar Network is the Smart Contract Hub for WASM + EVM on Polkadot. Since winning its Parachain auction in January 2022, Astar Network has become the top Parachain in the Polkadot ecosystem in Total Value Locked and most Ethereum assets transferred over. Astar Network is the leading smart contract hub that connects the Polkadot ecosystem to Ethereum, Cosmos, and all major layer 1 blockchains. Astar Network supports dApps using multiple virtual machines — namely WASM and EVM — and offers the best technology solutions and financial incentives via its Build2Earn and Astar Incubation Program for Web3 developers to build on top of a secure, scalable, and interoperable blockchain. The work of the community is maintained under a public domain license at https://github.com/AstarNetwork.

IoTeX is a blockchain-based platform, designed to become the decentralized backbone for Internet of Things applications. With an ever-growing ecosystem of projects and products from DeFi to Tools to Gaming, IoTeX currently leads the world’s premier industry consortiums and standards bodies such as IEEE, IIC, and more. With numerous contributions to the Blockchain and IoT space, the IoTeX blockchain already powers real devices, including Ucam, an award-winning blockchain-powered cameras presented at the Consumer Electronics Show (CES) and the Pebble geo device. Pebble is a secure device designed by IoTeX and perfect for supply chain optimization in any industry. As a next step, IoTeX is launching “MachineFi” , to power next-gen IoT applications.

Harmony is an open and fast blockchain. The production mainnet supports 4 shards of 1000 nodes, capable of running Ethereum applications with 2-second transaction finality, and 1000 times lower fees than Ethereum. Harmony is your open platform for assets, collectibles, identity, governance. The secure bridges offer cross-chain asset transfers with Ethereum, Binance and 3 other chains. Harmony’s Effective Proof-of-Stake (EPoS) reduces centralization while supporting stake delegation, reward compounding and double-sign slashing. Harmony aims to build an open network of nodes operated and governed by a large community. This node community is called Pangaea.

Cronos is the first Ethereum-compatible blockchain network built on Cosmos SDK technology. An open-source and permission-less Layer 1 chain which runs in parallel to the Crypto.org Chain, Cronos aims to massively scale the DeFi, GameFi, and overall Web3 user community by providing builders with the ability to instantly port apps and crypto assets from other chains while benefiting from low transaction fees, high throughput, and fast finality.

 Aurora is an Ethereum Virtual Machine (EVM) implemented as a smart contract on NEAR Protocol. Aurora is a solution, that allows developers to execute Ethereum contracts in a more performant environment: The NEAR blockchain. NEAR is a modern layer-1 blockchain which is fast with 2-3 second transaction finalization time, scalable, and carbon neutral.  Aurora supports all tools available in the Ethereum ecosystem — MetaMask, Truffle, Hardhat, Remix, etc. Additionally, NEAR’s trustless bridge to Ethereum means even the assets on Aurora are the same as Ethereum.

The Oasis Emerald ParaTime is the official EVM compatible ParaTime providing smart contract environment with full EVM compatibility.

Boba Network is an EVM-equivalent Layer-2 scaling solution and Hybrid Compute platform offering lightning fast transactions and fees up to 100x less than Layer-1. Their Hybrid Compute technology brings the power of Web2 on-chain for the first time, allowing smart contracts to call any external Web2 API to execute complex algorithms such as machine learning classifiers, pull in real-world or enterprise data in a single atomic transaction, or sync with the latest state of a gaming engine. Leveraging off-chain computing and real-world data, developers and creators can offer an enriched experience unlike anything else on the market today. We’re delivering a faster, cheaper, and smarter experience for blockchain’s next billion users. Supported Layer-1 blockchains include: Ethereum, BNB, Avalanche, and Moonbeam

The Shiden Network is a scalable and interoperable infrastructure for Web3.0. Since the Shiden Network is built with Parity’s Substrate framework, it can be a future Kusama parachain that also acts as a scalable smart contract platform. The Kusama Relaychain, by design, does not support smart contracts. This allows the Shiden Network the opportunity to fill in this gap. Scalability is obviously one of the most crucial demands dApp developers have. Ideally, the developers can build whatever applications on the Shiden Network without having to consider its scalability. The Shiden Network is built on the Kusama parent chain.

Scroll is building a fully EVM-Equivalent general purpose zk-Rollup built for the purpose of scaling the Ethereum network.

The Covalent Network serves as the universal data model for multi-chain indexing and querying. The Covalent Network represents the progressive decentralization of Covalent toward a community-owned and community-run protocol. Read more to understand the supply side, demand side, and roles of network operators in the network section of our docs. 

DeFi Kingdoms is a cross-chain, play-to-earn game built on a strong DeFi protocol with plans to become a fully-fledged MMORPG. It is under the appchain umbrella of Avalanche.

Swimmer Network is the dedicated blockchain gaming hub of the popular Play-and-Earn game, Crabada. Swimmer Network leverages the existing infrastructure and security of the Avalanche Network, and is one of the appchains in this ecosystem.

Gather Network is the underlying protocol layer of the Gather Online marketplace-based platform where publishers meet with enterprises and developers, aiming to bring the usage of blockchain to the mainstream by bridging the gap between websites and normal users, promoting transparency, security, and rewarding all participants. The Gather Network blockchain is a fork of Ethereum and supports most of the features of Ethereum Blockchain including the Ethereum Virtual Machine (EVM). Gather currently uses a proof of work consensus mechanism and currently offers and average TPS of 20 and the block gas limit is 8,000,000.

Optimism is a low-cost and lightning-fast Ethereum L2 blockchain. 

Calypso Hub is the official launch point for NFT projects on SKALE. 

SKALE is the only blockchain network capable of running an unlimited number of fast, on-demand, pooled-security Blockchains with zero gas fees to end users.

Razor Network is a decentralized oracle providing data to the smart contracts using a network of stakers. 

Dexalot is a revolutionary decentralized exchange aiming at bringing the traditional centralized exchange look and feel, through a decentralized on-chain application. Dexalot is one of the appchains in the Avalanche ecosystem.

Omnus is the SKALE appchain powering CryptoBlades; a revolutionary a web based NFT roleplaying game launched on the Binance Smart Chain and brought to existence by the talented group of Riveted Games.

Metis is an Ethereum Smart Layer 2 solving the blockchain trilemma of being secure, scalable and decentralized without compromise.

Milkomeda delivers rollup technologies to leading Layer 1 ecosystems by offering the most popular smart contracting language, Solidity, while enhancing inter-blockchain interoperability, user experience, and developer traction all at the Layer 2 level.

Solana is a high-performance blockchain supporting builders around the world creating crypto apps that scale today. Covalent supports Solana through our balances endpoint exclusively.

Europa Hub is a group of liquidity-related services, founded by Ruby and several other dApps, running on a shared SKALE Chain.

Meter is a high performance infrastructure that allows smart contracts to scale and travel seamlessly through heterogeneous blockchain networks.

Exorde gathers and links public content from all over the world and enables developers to crawl this data.

Neon is an EVM on Solana that features scalability and easy smart contract adaptation.

Calypso Hub is the official launch point for NFT projects on SKALE.

Arbitrum Nova is a blockchain that features ultra-low transaction costs with high security.

Canto is a general-purpose blockchain running the Ethereum Virtual Machine (EVM). It is focused on DeFi, making new systems will be made accessible, transparent, decentralized, and free.

BitTorrent is a leading software company with popular torrent client software for Windows, Mac, Android, and more, powered by the BitTorrent blockchain.

Flare is an EVM-based blockchain that allows developers to build with decentralized data from other chains and the internet.

Flare is an EVM-based Layer 1 blockchain with secure, decentralized access to information from other chains and the internet.

Songbird is the canary network for Flare. In contrast to a testnet which generally has an unlimited token supply, a canary network is an operational blockchain with a defined token supply that allows new features to be tested under production conditions, before they are deployed on the main network. 

KCC is a high performance decentralized public chain built by the fans of KCS and KuCoin.

Polygon zkEVM is a decentralized Ethereum Layer 2 scalability solution that uses cryptographic zero-knowledge proofs to offer validity and quick finality to off-chain transaction computation, also known as a ZK-Rollup.

Linea is a type 2 zero knowledge Ethereum Virtual Machine that replicates an Ethereum environment by using rollups.

Base is a low-cost, secure, developer-friendly Ethereum L2 that serves as a home for Coinbase’s onchain products.

Mantle is a high-performance Ethereum layer-2 network built with modular architecture delivering low fees and high security.

The Scroll Alpha Testnet consists of Ethereum's Goerli Testnet and the Scroll Alpha test network.

Oasys is an eco-friendly blockchain built for the gaming community, offering the best user experience with fast transactions and zero gas fees.

Findora is a Layer-1 blockchain focused on privacy that’s auditable and programmable. It does this by combining an EVM layer with a UTXO layer, allowing developers to leverage either chain model for their dApps.

SX Network is Polygon's first layer two blockchain, created to scale DeFi, NFT and betting applications.

Building Web3 Wallets (Part 2) - Curve LP Token Balances

How to Get Bitcoin Balances and Transactions

Understanding Web3 Wallets with Covalent

Building Web3 Wallets (Part 1) - Token Displays

Comparing Covalent’s Token Balances API to RPC Providers

Get token balances for address

Token Balances

Get a block

Core rendering

How to Block Spam NFT Tokens 

How to Verify NFT Ownership in a Collection

Check ownership in NFT collection

The returned list of pools only contains the active ones and we define active as pools that have had atleast one swap in the last days.

Get XY=K pools

Understanding Covalent’s xy=k Endpoints

XY=K

From Wallet to Web: Displaying NFT Holdings with Covalent's NFT Endpoints

Get NFTs for address

Get historical token prices

Building Web3 Wallets (Part 5) - Revoking Approvals for Your Wallet 

Get token approvals for address

Understanding Different Types of Blockchain Transactions with Covalent

How to Get the Latest Axie Spawns

A Guide to DeFi Taxes

Get a transaction

How to Build a 30-Day Historic Crypto Portfolio Chart

Get historical portfolio value over time

Class A

Get NFTs from contract with metadata

Get XY=K pools by address

Check ownership in NFT collection for specific token

Note: all our endpoints support address resolution natively allowing an ENS/RNS address to be passed in directly.

Get resolved address for registered address

Get ERC20 token transfers for address

Transactions

Get block heights

Ownership & Token Gating

Class B

Get XY=K address exchange balances

Building Web3 Wallets (P7) - Multi-Chain Wallet Activity Summary 

Get transaction summary for address

Get XY=K network exchange tokens

Pricing

Get logs

Get single NFT with cached metadata from contract

Security

Get earliest transactions for address (v3) 

Get log events by contract address

Base

Get XY=K supported DEXes

Introducing Transactions V3 APIs

Get recent transactions for address (v3)

How to Get Token Holder Data for ERC-20, ERC-721 and ERC-1155s

Get token holders as of any block height (v2)

Get single NFT with external metadata from contract

Get log events by topic hash(es)

Get NFT transactions for contract

Get XY=K single network exchange token

Get all chains

Seeking NFT Alpha with Covalent

Get traits for a collection

Get XY=K transactions for account address

Get paginated transactions for address (v3)

How to Get All Historical Transactions in a Block 

How to Flag Interesting Wallets or Transactions 

Get all transactions in a block (v3)

Get all chain statuses

Get XY=K transactions for token address

Get trait summary for collection

Get attributes for a collection trait

Get XY=K transactions for exchange

Get all transactions in a block by page (v3) 

Get XY=K ecosystem chart data

Scaling Transactions API with Time Buckets

Get bulk time bucket transactions for address (v3)

Get chain collections

Get XY=K health data

Get wallet balances, wallet transactions and aggregated market statistics for Dodo.

Get market data for a specific Dodo pool.

Get market data by address

pool-address

Get wallet balances, wallet transactions and aggregated market statistics for Curve.

Get underlying tokens for a wallet's LP tokens.

Get redeemable token balance

Passing in an `ENS` resolves automatically.

address

Get wallet balances, wallet transactions and aggregated market statistics for Balancer.

Get wallet balances, wallet transactions and aggregated market statistics for Frax lending.

Get wallet balances, wallet transactions and aggregated market statistics for Aave.

Get market data for a specific Aave lending pool.

Get market data by address 

Get market data for a specific Frax lending pool.

Get market data for a specific Balancer pool.

Get wallet balances, wallet transactions and aggregated market statistics for Lido.

Get market data for a specific Lido lending pool.

Get wallet balances, wallet transactions and aggregated market statistics for Compound.

Get market data for a specific Compound lending pool.

Get wallet balances, wallet transactions and aggregated market statistics for Yearn vaults.

Get all markets for Yearn including TVL, Supply and Borrow rates.

Get  all markets

Get wallet balances, wallet transactions and aggregated market statistics for InstaDapp.

Get all markets

Get all markets for Aave including TVL, Supply and Borrow rates.

Get all markets for Curve including TVL, Supply and Borrow rates.

Get all markets for Balancer including TVL, Supply and Borrow rates.

Get balances for a wallet address

Get all markets for Compound including TVL, Supply and Borrow rates.

Get all markets for Frax including TVL, Supply and Borrow rates.

Get market data for all InstaDapp vaults.

Get wallet balances, wallet transactions and aggregated market statistics for Bitcoin addresses.

Chain name	`aurora-mainnet`
Chain ID	`1313161554`
Block explorer	https://aurorascan.dev/
Blocktime	3 seconds
Historical balances	✅
NFT assets and metadata	✅
Premium Endpoints
Premium Balances	❌
Premium Transactions	❌
Premium Log Events	❌
Query via SQL on Increment	✅

Days Weeks Month Year	-	-	-
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.	-	-	-
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Aurora Blockchain Data Indexing API

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Code Samples

Get token balances for address