In the month of March, we indexed another handful of new blockchains, including Oasis Sapphire, Mantle, KCC, Oasys, Findora and SX Network. Users can query all on-chain data for these chains through our Class A endpoints. This brings our total count of blockchains supported at the end of Q1 2023 to over 100!

Multiple blockchains indexed; Oasis Sapphire, Mantle, KCC, Oasys, Findora and SX Network

We just released a new token holders endpoint, supporting ERC20, ERC721, and ERC1155 tokens. This endpoint will have the same parameters as the original one we deprecated, apart from `page-size`, which is fixed at 100. Users can fetch historical token holders with the parameter `block-height`.

New Token Holders Endpoint

The Base Testnet, Polygon zkEVM Testnet, ConsenSys zkEVM Testnet and Scroll Alpha Testnet are now fully indexed! Users can query all on-chain data through our Class A endpoints!

New Testnets Indexed; Base, Polygon zkEVM, ConsenSys zkEVM, Scroll Alpha

We're halfway through February with eight new blockchains indexed already! For Metis, Milkomeda (A1 & C1), Arbitrum Nova, Canto, Flare, Songbird, BitTorrent and Neon, users can query all on-chain data through our Class A endpoints.

Multiple Blockchains Indexed; Metis, Milkomeda, Arbitrum Nova, Canto, Flare, Songbird, BitTorrent and Neon

With so much growth in the NFT sector, we saw fit to expose better pathways to this data with NFT transactions, traits, attributes, ownership and more. We released a new suite of NFT endpoints offering:

- [Get NFTs for address](https://www.covalenthq.com/docs/api/nft/get-nfts-for-address/)
- [Get NFT token IDs for contract with metadata](https://www.covalenthq.com/docs/api/nft/get-nft-token-ids-for-contract-with-metadata/)
- [Get NFT transactions for contract](https://www.covalenthq.com/docs/api/nft/get-nft-transactions-contract/)
- [Get Traits for a collection](https://www.covalenthq.com/docs/api/nft/get-list-of-traits-collection/)
- [Get Attributes for a collection trait](https://www.covalenthq.com/docs/api/nft/get-attribute-values-collection-trait/)
- [Get Trait Summary for collection](https://www.covalenthq.com/docs/api/nft/get-collection-trait-summary/)
- [Check ownership in NFT collection](https://www.covalenthq.com/docs/api/nft/check-ownership-in-nft-collection/)
- [Check ownership in NFT collection for specific token](https://www.covalenthq.com/docs/api/nft/check-ownership-in-nft-collection-token/)

Try them out!

New NFT Endpoints

Starting **March 1, 2023**, we are making significant changes to our Free tier, and we will restrict free users to a limit of 100,000 API credits per month. 

At the end of 2022, we soft-launched our Premium tier, which offers higher rate limits on specific endpoints and flexible pricing dependent on credit usage. 

From March 1 onwards, if you require a higher volume of API calls beyond 100,000 per month, please move to our Premium plan.

The Covalent API will always be free to try, especially to support hackathons and early stage products. By capping the volume of requests on our free API, we can ensure a good experience for everyone.

Read more about the credit system for our Free and Premium tiers by clicking the button below.

Changes to Our Free API

This month, we unveiled support for Bitcoin as part of our new class of endpoints: Class C! 

Class C is the next generation of endpoints, which partners and community members can build using SQL. 

Users can now access Bitcoin balance and transaction data through the Class C section on our docs and other protocols like Aave, Compound and Lido. 

Additionally, we released new transactions endpoints allowing users to get transactions by block and get all transactions for large addresses with reliable pagination. 

Lastly, the Covalent Premium API tier now supports BNB Smart Chain (BSC) through the balances endpoint! This means Premium users will get access to 50 requests per second when querying token balances on Binance. 

Bitcoin, Class C, New Transactions Endpoints and Updates to Premium API

The Meter blockchain is now fully indexed! Users can query all on-chain data through our Class A endpoints.

Additionally, the RSK blockchain has now rebranded to Rootstock. 

Lastly, we have replaced the previously indexed Arbitrum testnet with Arbitrum Goerli which is now fully indexed and supported through our Class A endpoints. 

Meter Indexed and Other Updates

In December, we continued our expansion into appchains!

We indexed Dexalot in the Avalanche ecosystem and four SKALE appchains: Calypso, Omnus/Cryptoblades, Razor and Europa Hub! Users can query all on-chain data through our Class A endpoints.


Multiple Blockchains Indexed; Dexalot, Calypso, Omnus/Cryptoblades, Razor and Europa Hub

The Premium tier is available for users who want to scale with us. The Covalent Unified API has always been free and will always have a free tier. We believe in making data easily accessible, but that has led us to rate limit this shared resource to maintain a good experience for everyone. In the Premium tier, we are adding updated endpoints with faster and more reliable engines in the backend, allowing us to support higher RPS and a higher volume of requests.

The launch of the Covalent Premium API exclusively features our most popular endpoint: Get token balances for address on the Ethereum blockchain, and is currently only available to select users. In 2023 the Premium API will go public and include multiple upgraded endpoints. 

Covalent Soft-Launches Premium API with Select Users

In a partnership with blockchain infrastructure provider [NodeReal](https://nodereal.io/), Covalent's best-in-class balances endpoint is now available through the NodeReal [Web3 API Marketplace](https://nodereal.io/meganode/api-marketplace/covalent-api). This integration makes it easy for developers to go beyond the RPC layer with aggregated blockchain data across multiple chains, starting with Ethereum mainnet. 

Covalent Balances Endpoint Available Now Available Through NodeReal

This month we have rapidly indexed a handful of appchains!

This includes Gather Network, the Oasis Emerald ParaTime blockchain, the Scroll ZK-rollup (in its Pre-Alpha Testnet phase) and Boba Network! Users can query all on-chain data through our Class A endpoints.

The Boba Network includes the following supported Layer 1 blockchains: Ethereum, BNB Smart Chain, Avalanche, and Moonbeam.

Multiple Blockchains Indexed; Gather, Oasis, Scroll and Boba

Covalent's `Get token balances for address` endpoint has long been a favourite of our developer community. This year, we rebuilt the entire backend engine powering this endpoint in order to support our rapidly growing user base and their applications. In November, we completed QA testing and seemlessly made the switch from `balances_v2` to `balances_v3`. This is the first of many upgrades to our existing endpoints in order to build for scale, and the next release will be transactions. 

New Balances Engine Complete

The DeFi Kingdoms and Swimmer Network Appchains are now fully indexed! Users can query all on-chain data through our Class A endpoints and DeFi Kingdoms through our XY=K endpoints.


DeFi Kingdoms and Swimmer Network Appchains Indexed

The Ethereum Goerli Testnet is now fully indexed! Users can query all on-chain data through our Class A endpoints.



Goerli Testnet Indexed

The Covalent Network Staking dashboard V1.2 is here. There are several new functions, bug fixes, and front-end improvements with this release, most of which were inspired by the Covalent community.

Covalent Network Staking Dashboard V1.2 is Released

We added a feature that allows users to pass in human-readable, non-numeric chain IDs -these are chain names. For example, instead of specifying `chain_id` as `1` for Ethereum Mainnet, users can now use the `chain-name`: `eth-mainnet`. This feature becomes helpful when chain IDs become particularly large and/or hard to remember in cases like Palm (11297108109) and Harmony (1666600000).

To get the network name to use for the chain_id, refer to the `name` field of the Get all chains endpoint response.
* Chain Id integer: https://api.covalenthq.com/v1/1/address/0x…/balances_v2
* Chain Id name: https://api.covalenthq.com/v1/eth-mainnet/address/0x…/balances_v2

We’ve also updated our `Get transactions for address` endpoint with a pagination improvement. Previously, this endpoint would timeout for addresses with too many transactions. Now the user can specify the `page-number` parameter with small values and the endpoint will successfully retrieve those transactions.

Additionally, we fixed an issue where the `fees_paid` field was `null` in the `Get a transaction` and `Get transactions for address` endpoints' response.

New Chain Name Feature

The Godwoken L2 network is now fully indexed! Godwoken runs on the Nervos blockchain. Users can query all on-chain data through our Class A endpoints. 


Godwoken Indexed

BSP Geth and BSP Agent have been tested and upgraded to v1.2.1 and v1.2.3, respectively. Included in this update are node updates as well as performance and schema improvements. Some improvements have been designed to tackle the storage bloat issue Network Operators have raised. The Covalent team will be monitoring if this issue continues with this upgrade. With this upgrade, **please note that these versions must be run together. **The links to these releases can be found below, and more detail on what has changed. - [BSP Geth v1.2.1](https://github.com/covalenthq/bsp-geth/releases/tag/v1.2.1-bsp) - [BSP Agent v1.2.3](https://github.com/covalenthq/bsp-agent/releases/tag/v1.2.3) For questions and support on these upgrades, please use Discord and the appropriate Covalent Network channel.

BSP Geth & Agent Version Update

The Cronos blockchain is now fully indexed! Users can query all on-chain data through our Class A endpoints. We’ve also added support for MMF and VVS Finance to our XY=K DEX endpoints.

Cronos Indexed

The Astar blockchain is now fully indexed! Users can query all on-chain data through our Class A endpoints. We’ve also added support for ArthSwap to our XY=K DEX endpoints.


Astar Indexed

The Evmos blockchain is now fully indexed! Users can query all on-chain data through our Class A endpoints. We’ve also added support for Diffusion, Cronus, and EvmoSwap to our XY=K DEX endpoints.

Additionally, we have indexed the Aurora blockchain! Along with Class A support, we have added support for WannaSwap and Trisolaris to our XY=K endpoints!

Evmos and Aurora Indexed

Covalent makes the world’s first proof-based data indexer live with the launch of staking on the Covalent decentralized network. Network staking via the Covalent Query Token (CQT) enables anybody from the community to contribute to governing and securing the decentralized protocol.

Block Specimen Producers are Live Alongside Covalent Network Staking

Covalent releases a new use case webpage focused on its leading Decentralized Exchange (DEX) endpoints and their applications https://www.covalenthq.com/use-cases/dex/. This is the first of many curated use case pages to onboard new and experienced developers into Web3.

Covalent Spotlights Use Cases with DEX Data

Covalent releases a new template that anyone can use to create a customizable NFT dashboard that pulls granular, historical NFT data from multiple blockchains including Ethereum, Polygon, Avalanche and many others. Following the README instructions on our GitHub https://github.com/covalenthq/nft-dashboard-template, users can fetch aggregate NFT data with no reliance on marketplace tools like the OpenSea API.

New NFT Dashboard Template

Covalent launches non-EVM support with Solana balances, bringing the industry-leading unified API experience to tens of thousands of developers in the Solana ecosystem. The `Get token balances for address` endpoint enables developers to fetch token balances including NFTs for any wallet address on Solana with a single API call. With this new data, developers can include Solana assets in multi-chain crypto wallets, NFT galleries and more. This is just step one in the process of fully indexing Solana across all of our Class A endpoints.

New Solana Balances Endpoint

Covalent is excited to finally announce and open-source the Block Specimen, a novel invention that is pivotal to the decentralized Covalent Network. The anticipated Covalent Network roadmap is also live and can be viewed on the new Covalent Network homepage.

Open Sourcing the Block Specimen

Covalent has introduced 2 new Class A endpoints which provide granular NFT market data for numerous marketplaces across 5 blockchains – Ethereum, Binance Smart Chain, Polygon, Avalanche, and Moonriver. The new endpoints provide both a global view of NFT collections ranked by market cap, as well as a detailed view of historical sale and floor price information for a particular collection. Thus far, it’s been hard to understand markets outside of Ethereum/OpenSea. These APIs address this gap by providing unprecedented access to this much-requested on-chain data.

New NFT Market Data Endpoints

Covalent has introduced a list of Class B endpoints under the XY=K family which provide the richest and most robust on-chain DEX data available today. The Unified xy=k endpoints return all the required data for any UniswapV2-like protocol such as SpiritSwap, Pangolin, SushiSwap and more, on a variety of blockchains, enabling developers to access these protocols in a matter of minutes.

New XY=K Endpoints

Today, we at Covalent are excited to launch a new reference documentation experience for our Unified Blockchain APIs. This new product is a complete re-thinking of the experience after speaking with thousands of developers who have come to rely on the Covalent API for their everyday blockchain data needs.

API Changelog