> ## Documentation Index
> Fetch the complete documentation index at: https://goldrush.dev/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Foundational API Overview

> The GoldRush Foundational API is a set of foundational multichain data APIs that offers structured responses for token balances, NFT assets, transactions, decoded log events, traces with internal transactions, state changes and input data. This API is ideal for applications that render wallet balances and activities, build NFT galleries, download historical transactions for cost-basis calculations among other use-cases. The API is offered via REST endpoints allowing developers to filter for specific chains and wallet addresses.

The Foundational API delivers refined, structured data - not raw RPC responses. Every response includes decoded event logs, token metadata, scaled amounts, and USD pricing. [Learn how our Medallion Architecture works →](/resources/medallion-architecture)

## Use Cases

<Columns cols={3}>
  <Card title="Wallet API" cta="API Reference" href="/api-reference/foundational-api/balances/get-token-balances-for-address" img="https://www.datocms-assets.com/86369/1750700004-goldrush-images-03.png">
    Multichain token balances (ERC20, 721, 1155, native), token transfers and prices (spot and historical) for a wallet.
  </Card>

  <Card title="Activity Feed API" cta="API Reference" href="/api-reference/foundational-api/transactions/get-transaction-summary-for-address" img="https://www.datocms-assets.com/86369/1750700004-goldrush-images-04.png">
    Multichain historical transactions with human-readable event logs and historical prices. Includes transaction count and gas usage/spend summaries.
  </Card>

  <Card title="NFT API" cta="API Reference" href="/api-reference/foundational-api/nft/get-nfts-for-address" img="https://www.datocms-assets.com/86369/1750700004-goldrush-images-05.png">
    Media assets, metadata, sales, owners, trait and attribute filters, thumbnail previews.
  </Card>

  <Card title="Bitcoin API" cta="API Reference" href="/api-reference/foundational-api/balances/get-bitcoin-balance-for-address" img="https://www.datocms-assets.com/86369/1750700004-goldrush-images-02.png">
    Bitcoin balances and transactions for x/y/zpub and non-HD addresses, including historical and spot prices.
  </Card>

  <Card title="Security API" cta="API Reference" href="/api-reference/foundational-api/security/get-token-approvals-for-address" img="https://www.datocms-assets.com/86369/1750700004-goldrush-images-07.png">
    NFT and ERC20 token allowances, including value-at-risk.
  </Card>

  <Card title="Block Explorer API" cta="API Reference" href="/api-reference/foundational-api/utility/get-logs" img="https://www.datocms-assets.com/86369/1750700004-goldrush-images-08.png">
    Block details, event logs by contract address or topic hash, gas prices, token prices & holders.
  </Card>
</Columns>