Indexer gives you low-latency reads across EVM chains: balances and portfolio, token and NFT ownership, transfers and logs, prices, and contract events. It is built for production: cursor-based pagination, filters, webhooks, and event subscriptions. All in a scalable, 99.99% uptime service.

API Reference

Endpoints, filters, pagination, and response shapes.

Cross-Chain Token Balances

Fetch token balances across multiple EVM chains with a single API call.

Token Balances

Fetch token balances for any wallet or contract address.

Transaction History

Fetch transaction history for any wallet or contract address.

Subscriptions

Subscribe to events, receipts, balance updates for any wallet or contract address.

Webhooks

Receive webhook triggers for any contract emitted event.

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What you can build

  • Wallet and portfolio views: unified balances and positions across chains.
  • Activity feeds: transfers, mints, burns, sales.
  • Collection browsers: NFTs with metadata and ownership.
  • Analytics: prices, volumes, holders, and contract events.

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Quickstart

Use the SDKs for the fastest path, or call the REST API directly. The examples below illustrate typical requests; see the API reference for exact parameters and response fields. 
curl -X POST https://polygon-indexer.sequence.app/rpc/Indexer/GetTokenBalances \
 -H "Content-Type: application/json" \
 -H "X-Access-Key: AQAAAAAAAF_JvPALhBthL7VGn6jV0YDqaFY" \
 -d '{ "accountAddress": "0x8e3E38fe7367dd3b52D1e281E4e8400447C8d8B9", "includeMetadata": true }'

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Supported Networks

You can see the full list of supported networks here.

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Further Reading

Here are a few example queries you can make to a blockchain from your app, game, or wallet: