Covalent provides complete and accurate records of crypto assets, transactions, and holdings. This data helps ensure compliance with tax laws and regulations, minimizing the risk of error for you and your clients.

Accuracy

As a company, we prioritize compliance. Our API is built to the highest security standards, keeping your clients' data safe and secure. 

Security

While blockchain data is public, user information is confidential. We care about protecting the privacy of your clients and your organization.

Privacy

We know that preparing taxes requires a significant amount of time and resources. Our endpoints undergo an extensive QA process, ensuring we provide complete and reliable data to help streamline your workflow.

Reliability

Transacting in Web3 may require many steps, but getting on-chain data doesn't. 

Covalent supports a wide range of use cases and queries, so you can easily access the data you need. With our level of coverage, you are well-equipped to provide the best service for your high-value clients. 

We specialize in understanding blockchains and can support you every step of the way.


The most extensive data coverage in Web3

The Covalent API is built to handle large amounts of data in a single API call, making it well-suited for tax season when you need to process large amounts of blockchain data.

Scalability

Covalent provides professional support for enterprise customers, so you can focus on delivering efficient tax solutions to your clients, never worrying about getting help when you need it.

Support

Build once, use often. We know you can't waste resources during tax season. Covalent's structured schema means you only need to build your system once.

Efficiency

With alternative options like self-hosting nodes, RPC providers, or third-party tax service companies, here are a few reasons that Covalent remains a number one choice for tax providers. 


Why choose Covalent for your data needs?

Covalent Deep Blue

We at Covalent believe that easy access to data is critical for blockchains to reach mainstream adoption. We keep that bigger vision in mind for everything we build so our users can grow with us. 

Our approach

The team at Covalent has been a pleasure to work with. They're always quick to respond to any questions or concerns, and their expertise has been invaluable in helping us navigate the complex world of blockchain data.

Blockchain App Manager

We've tried several other blockchain data providers, but none have come close to the level of service and support we've received from Covalent. They've gone above and beyond to help us integrate their data into our systems and understand it.

Lead Engineer

Covalent has been a game changer for us. We no longer have to spend hours manually gathering data and cross-referencing it with multiple sources. With just a few API calls, we can get all the data we need.

Software Engineer

What customers are saying about us

Given `chainName` and wallet `contractAddress`, return all transactions along with their decoded log events. This endpoint does a deep-crawl of the blockchain to retrieve all kinds of transactions that references the `contractAddress` including indexed topics within the event logs.

Get log events by contract address

Covalent's rich API response means you can drastically reduce your number of API calls. Minimize the time you take to process financial data and focus on other things, like supporting your clients.

Make powerful queries

Need to find transactions from years ago? We index blockchains from the genesis block, allowing you to access complete data from any point in time. 

Crawl through a complete history of the blockchain

Have all your API usage data immediately available when you sign in to your account dashboard. Covalent utilizes a credit system to track API usage. 

Estimate your cost

Check out some of these resources related to crypto taxes with the Covalent API.


Ready to learn more?

The API reference is an interactive tool that lets you make API calls directly from the browser! Check out our full list of endpoints and their parameters.

API reference

To crawl historical transactions reliably at scale, learn about our time bucket solution and how to optimize these queries. 

Scaling the transactions endpoint with time buckets

Understand the differences between DeFi and traditional financial markets and the types of taxable DeFi transactions. 

A guide to DeFi taxes

We partner with you throughout your build process, providing our data expertise, email and video call support, custom endpoints and personalized recommendations. Our pricing options are customizable to accommodate your data needs.


Ready to sign up?

Building a crypto tax application? Struggling to find an all-in-one data provider that lets you access multiple blockchains? Covalent provides comprehensive historical data through a cohesive interface, so you can confidently support your customers anywhere they may have transacted on-chain.

Get a transaction

Confidently support your customers anywhere they may have transacted on-chain. Get access to complete historical data through a cohesive interface with the Covalent API. Get started for FREE. Grow as needed.

Rotki Dashboard , Powered By Covalent

Build crypto tax solutions that scale

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

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.

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.

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

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

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.

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.

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.

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

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

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.

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

10+ Supported Appchains

Covalent surfaces nascent communities by indexing growing appchains and giving developers access to new data. Our unified API makes it easy to build just about anything! Check out some of what is possible with Covalent.

What are developers building?

Developers use Covalent to fetch transactions for decentralized exchange contract addresses and display all types of information. 

DeFi dashboards

Calculate cost basis by extracting the historical balance and price of any token on 80+ supported blockchains.

Taxation tools

Covalent supports the top wallets in Web3 through our balances endpoint which returns all ERC20 and NFT balances for a given address. 

Wallets

Covalent has crawled and cached millions of NFT datapoints accross blockchains to make them easily accessible for developers building galleries, marketplaces, wallets and more.

NFT solutions

Covalent supports a vibrant community of developers who love to easily add new chains like yours to their applications. 

Community

Covalent offers rich blockchain traction analytics as well as deep dives into your ecosystem data to bring new builders to your chain.

Analytics

Enjoy dedicated communication channels with our team to ensure maximum uptime and resolve any issues immediately. 

Gain a competitive advantage in the market. Partnering with Covalent can help you offer better data quality, increased functionality, and an improved experience to your users. Grow with our community of builders to increase the adoption of your platform and applications built on it.

Why choose Covalent to index your appchain?

Appchains supported by Covalent

We at Covalent believe that easy access to data is critical for blockchains to reach mainstream adoption. We keep that bigger vision in mind for everything we build so our users can grow with us.

Covalent was a key part in us rapidly growing our ecosystem. Their team goes above and beyond to share invaluable data with us and showcase our chain to their community. 

Business Development Manager

Covalent actually indexed our appchain before we even knew about it. They solved our data challenges immediately out of the gate!

Within weeks we saw new leaderboards and other analytics sites popping up in our ecosystem that were never there before. Covalent made that possible. 

Community Manager

Want Covalent to index your appchain and provide your data to over 40000 developers? 

How can we help you?

Expose your appchain platform to a vibrant community of over 40,000 developers. Prioritize data accuracy and quality, speed and scalability, cost-effectiveness, integration ease, and customer support when you choose Covalent.

Join the number one indexer of appchains in Web3

One API call returns ALL the token balances for a given wallet address on a given blockchain including:
- ERC20 fungible tokens
- LP position tokens from DeFi protocols like Uniswap and Balancer
- ERC721 and ERC1155 NFT tokens
- Network native tokens (ETH on Ethereum)

Scale your wallet app seamlessly by simply swapping the `chainName` to any of the other 100+ supported blockchains. 

Get token balances for address

Covalent maintains a full archival copy of a blockchain for every supported chain meaning every transaction for any wallet or contract address is available since the genesis block. 

Fetch detailed transactions, including decoded log events, for a wallet address by a specified time interval, or leverage the pagination feature to bulk fetch ALL transactions for rich downstream applications like taxation, analysis or machine learning use-cases.

Get recent transactions for address (v3)

A simple and fast way to fetch all the NFTs held by an address including NFT metadata and image assets. Both ERC721 and ERC1155 NFT standards are supported

Fetching NFT data, especially off-chain metadata and image assets can be a major challenge. Covalent makes this easy for wallet developers by downloading, normalizing and caching external NFT metadata and image assets. Check out our NFT coverage [details](https://www.covalenthq.com/docs/unified-api/data-coverage/).

Get NFTs for address

Covalent’s Class C endpoints now provide a set of key endpoints for the top DeFi protocols including Aave, Curve, Yearn, Lido and several others. 

For each protocol, easily fetch:
- Wallet balances including staking and yield farming rewards, debt positions and redeemable token values
- Historical Wallet transactions including tokens swapped, fees paid and interest earned
- Full list of all markets or pools available along with their TVL, APY or APR values


Get positions by top DeFi protocols for address

Covalent’s suite of XY=K endpoints offers position and swap details for wallet addresses interacting with pools on popular DEXs such as Uniswap V2, SushiSwap, PancakeSwap, and more. 

Get XY=K balances & transactions for address

Have all your API usage data immediately available when you sign in to your account dashboard. Covalent utilizes a credit system to track API usage, and credits are only charged if you opt for the Premium tier, which offers higher rate limits on select endpoints.

XDeFi

Rainbow

Omni

Bitski

Powering the top wallets in Web3

What Covalent has done is a game changer. No other infrastructure provides this quality of data. They've allowed us to scale rapidly with our users.

Covalent's API is indispensable for us. It has reduced our engineering time, cost and maintenance by 10x!

Product Manager

Get started for free and access the richest blockchain data via the Covalent Unified API. We offer flexible pricing for when you need more data faster.

Get started for FREE. Grow as needed.

Build or augment your crypto wallet app using the Covalent API which offers the following data for any wallet address across all supported networks:

* ALL Token balances
* ALL Historical transactions
* ALL NFT balances with asset metadata
* ALL DeFi positions and market details

XY=K

Power your crypto wallet with one unified API

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.

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. 

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

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.

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.

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

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.