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

# Query Blockchain Data

> Access token, wallet, NFT, and social data across 90+ chains

Chainbase provides multiple ways to query on-chain data. Choose the approach that fits your use case.

## Quick Start: CLI

The fastest way to try Chainbase. Install the CLI and run a query in under a minute:

```bash theme={null}
npm install -g chainbase-cli
chainbase config set api-key YOUR_API_KEY
```

```bash theme={null}
# Get ETH price
chainbase token price 0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2

# Check wallet balances
chainbase balance tokens 0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045

# Trending crypto narratives (free, no API key)
chainbase tops trending
```

<Tip>
  Get your API key at [console.chainbase.com](https://console.chainbase.com/). For demo purposes, use the key "demo".
</Tip>

Full CLI reference: [CLI Documentation](/resources/ai/cli)

## Web3 API

REST API for structured queries — token metadata, balances, NFT ownership, ENS domains, and more.

```bash theme={null}
curl -X GET 'https://api.chainbase.com/v1/token/price?chain_id=1&contract_address=0xdAC17F958D2ee523a2206206994597C13D831ec7' \
  -H 'X-API-KEY: YOUR_API_KEY'
```

Available API suites:

* **Basic API** — Block and transaction queries
* **Token API** — Price, holders, metadata, transfers
* **NFT API** — Metadata, ownership, rarity, transfers
* **Balance API** — Native and ERC-20 token balances
* **Domain API** — ENS resolution and reverse lookup
* **Label API** — Address classification (exchange, whale, contract)

Full reference: [Web3 API Documentation](/resources/platform/features/api/web3-api) | [API Reference](/api-reference/overview)

## SQL API

Run custom SQL queries against Chainbase's indexed on-chain data warehouse for complex analytics.

```sql theme={null}
SELECT block_timestamp, _from, _to, _value
FROM ethereum.erc20_transfer
WHERE contract_address = '0xdAC17F958D2ee523a2206206994597C13D831ec7'
  AND block_number > 19000000
LIMIT 10
```

Full reference: [SQL API Documentation](/resources/platform/features/api/sql-api/overview) | [API Reference](/api-reference/sql-api/execute-queries)

## Tops API

Query crypto social intelligence — trending narratives, Twitter/X mentions, and sentiment signals. **Free, no API key required.**

```bash theme={null}
# Via CLI
chainbase tops trending

# Via API
curl -X GET 'https://api.chainbase.com/tops/v1/trending'
```

Full reference: [Tops API Reference](/api-reference/tops-api/tool/list-trending-topics)

## Next Steps

* [Explore All Products](/getting-started/explore-all-products) — See all Chainbase tools and services
* [API Reference](/api-reference/overview) — Complete endpoint documentation
* [Data Catalog](/catalog/overview) — Browse available chain data schemas
* [Tutorials](/getting-started/tutorials/balance-api/get-native-token-balances) — Step-by-step guides