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Covalent

Covalent is a structured data infrastructure provider with access to historical and current onchain data for 200+ supported blockchains, including Linea mainnet and Sepolia testnet.

Covalent maintains a full replica of every supported blockchain, meaning you have access to:

  • Every wallet's token balances
  • Full transaction histories
  • Every contract log event
  • All NFTs including assets and metadata

Use Covalent if you need:

  • Wallet, Transactions, NFT, DEX, Staking or core blockchain data (log events, blocks)
  • Normalized, aggregated and enhanced multichain data, well beyond what you get from RPC providers
  • Enterprise-grade performance

Sign up to start building on Linea

APIs​

The Covalent APIs enable developers to quickly and easily access structured onchain data. This means consistent response schemas regardless of the blockchain. Available APIs and corresponding use cases include:

Wallet API​

  • Features: All token balances (ERC20, 721, 1155, native), token transfers and prices (spot and historical) for a wallet.
  • Use cases: Wallets, portfolio trackers, token gating, airdrop snapshots.

NFT API​

  • Features: Media assets, metadata, sales, owners, trait & attribute filters, thumbnails, and previews.
  • Use cases: NFT galleries and marketplaces, real world asset (RWA) tracking, token gating.

DEX API​

  • Features: Positions, rewards, pool and token details for major DEX protocols.
  • Use cases: Analytics dashboards, leaderboards, reward calculators.

Cross-Chain Activity API​

  • Features: Single API call to fetch a list of active chains and the latest transaction date on each for an address.
  • Use cases: App onboarding.

Transactions API​

Security API​

  • Features: NFT and ERC20 token allowances, including value-at-risk.
  • Use cases: Revoke features in wallets, security applications.

Blockchain API​

  • Features: Block details, log events by contract address or topic hash, gas prices.
  • Use cases: Custom block explorers.

Developer tools​

There are 3 primary developer tools for using the APIs:

  1. Unified API - enterprise-grade endpoints to use with any programming language. Switch blockchains with one path parameter.

    curl -X GET https://api.covalenthq.com/v1/linea-mainnet/address/0xc882b111a75c0c657fc507c04fbfcd2cc984f071/balances_v2/ \
        -H 'Content-Type: application/json' \
        -u YOUR_API_KEY:

  2. Client SDKs - official client libraries including TypeScript, Go and Python.

    npm install @covalenthq/client-sdk
    import { CovalentClient } from "@covalenthq/client-sdk";

    (async () => {
    try {
        const client = new CovalentClient("YOUR_API_KEY");
        const transactions = client.TransactionService.getAllTransactionsForAddress("linea-mainnet", "0xc882b111a75c0c657fc507c04fbfcd2cc984f071");

        for await (const tx of transactions) {
        console.log("tx", tx);
        }
    } catch (error) {
        console.log(error.message);
    }
    })();

  3. GoldRush Kit - beautifully designed React components for your dApp frontend

    GoldRush Component Example

Get started​

  • API Key - sign up for free
  • Docs - comprehensive knowledge base for all things Covalent
  • Guides - learn how to build for various use cases and expand your onchain knowledge

Increment​

example-increment-chart

Increment is a novel no-code charting and reporting tool powered by Covalent. Simply type SQL, get charts.

Use cases​

Increment can be used for:

Get started​

  • Increment - login via the Covalent Platform
  • Docs - learn how to use Increment to build dynamic, custom charts
  • Data models demo - build analytics in three clicks