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

# Welcome to Uniblock

> Unified blockchain infrastructure for developers building multi-chain applications.

# What is Uniblock?

Uniblock is a unified blockchain API platform that provides consistent access to 160+ blockchains through a single interface. Instead of managing multiple provider integrations, you get one API key for all your blockchain data needs.

**Use Uniblock when you need to:**

* Query token balances, NFTs, or transactions across multiple chains
* Access real-time market data and price feeds
* Monitor blockchain events with webhooks
* Make JSON-RPC calls to any supported network
* Build cross-chain applications without managing multiple SDKs

## Who uses Uniblock?

* **DApp developers** building wallets, DEXs, or NFT platforms
* **Backend engineers** integrating blockchain data into existing apps
* **Analytics teams** tracking on-chain metrics and user behavior
* **Trading platforms** requiring real-time price and market data

<Info>
  Ready to start? Jump to the [Quickstart Guide](/guides/getting-started/uniblock-quickstart-guide) or explore the [API Reference](/reference/unified-api-reference-overview).
</Info>

***

## Core features

### Unified API

Access blockchain data with consistent endpoints across all chains. No need to learn different API patterns for each network.

```bash Example: Get token balance on any chain theme={null}
curl --location \
'https://api.uniblock.dev/uni/v1/token/balances?chainId=1&address=0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb' \
--header 'x-api-key: YOUR_API_KEY'
```

**Available APIs:**

* **Token API** - Balances, transfers, prices, allowances
* **NFT API** - Collections, metadata, floor prices, ownership
* **Transaction API** - History, receipts, gas estimation
* **Market Data API** - Prices, volume, trending tokens
* **Scans API** - Block explorers, contract verification
* **JSON-RPC** - Direct node access for all supported chains

[Explore Unified API →](/reference/unified-api/overview-unified-apis)

### Auto-routing

Uniblock automatically routes requests to the best available provider based on reliability, latency, and cost. If one provider fails, requests automatically retry with backup providers.

**Benefits:**

* No manual provider management
* Built-in failover and redundancy
* Optimized for cost and performance
* Single API key replaces dozens of provider keys

[Learn about auto-routing →](/guides/uniblock/autorouting/uniblock-auto-routing)

### Webhooks

Monitor blockchain events in real-time without polling. Get instant notifications for address activity, contract events, and NFT transfers.

```json Example: Address activity webhook payload theme={null}
{
  "webhookId": "wh_abc123",
  "eventType": "address.activity",
  "chainId": "1",
  "data": {
    "address": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb",
    "transactionHash": "0x123...",
    "blockNumber": 18500000,
    "value": "1000000000000000000"
  }
}
```

[Set up webhooks →](/reference/webhook/webhook-quickstart)

### Multi-chain support

Access 160+ blockchains including:

* **EVM chains** - Ethereum, Polygon, BSC, Arbitrum, Base, Optimism
* **Solana** - Mainnet, devnet, testnet
* **Bitcoin** - Mainnet, testnet
* **Stellar** - Horizon API and Soroban
* **TON** - Mainnet and testnet
* **Starknet, Sui, Polkadot** and more

[View all supported chains →](/reference/resources/chains/supported-chains)

***

## Common use cases

<CardGroup cols={2}>
  <Card title="Wallet integration" icon="wallet" href="/guides/use-cases/wallets-and-portfolio-trackers">
    Display token balances, NFTs, and transaction history for user wallets across multiple chains.
  </Card>

  <Card title="NFT marketplace" icon="image" href="/guides/use-cases/nft-marketplaces-and-discovery">
    Query NFT metadata, floor prices, collections, and track transfers in real-time.
  </Card>

  <Card title="DeFi dashboard" icon="chart-line" href="/guides/use-cases/defi-dashboards-and-analytics">
    Monitor token prices, liquidity pools, and trading volumes across DEXs.
  </Card>

  <Card title="Portfolio tracker" icon="briefcase" href="/guides/use-cases/wallets-and-portfolio-trackers">
    Aggregate user holdings across chains with real-time valuations and P\&L.
  </Card>
</CardGroup>

***

## Quick example

Here's how to get started with a simple token balance query:

<Steps>
  <Step title="Get your API key">
    Sign up at [dashboard.uniblock.dev](https://dashboard.uniblock.dev) and create a project to get your API key.
  </Step>

  <Step title="Make your first request">
    ```bash theme={null}
    curl --location \
    'https://api.uniblock.dev/uni/v1/token/balances?chainId=1&address=0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb' \
    --header 'x-api-key: YOUR_API_KEY'
    ```
  </Step>

  <Step title="Get the response">
    ```json theme={null}
    {
      "data": [
        {
          "tokenAddress": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
          "symbol": "USDC",
          "balance": "1000000000",
          "decimals": 6,
          "balanceFormatted": "1000.00",
          "valueUsd": "1000.00"
        }
      ]
    }
    ```
  </Step>
</Steps>

***

## Next steps

<CardGroup cols={2}>
  <Card title="Quickstart guide" icon="rocket" href="/guides/getting-started/uniblock-quickstart-guide">
    Create your first project and make API calls in 5 minutes.
  </Card>

  <Card title="API reference" icon="book" href="/reference/unified-api-reference-overview">
    Explore all available endpoints and interactive playgrounds.
  </Card>

  <Card title="Webhooks" icon="bell" href="/reference/webhook/webhook-quickstart">
    Set up real-time notifications for blockchain events.
  </Card>

  <Card title="Supported chains" icon="link" href="/reference/resources/chains/supported-chains">
    View the complete list of supported blockchains.
  </Card>
</CardGroup>

***

## Common pitfalls

<Warning>
  **Rate limits** - Free tier has rate limits. Monitor your usage in the dashboard and upgrade if needed. See [pricing plans](/reference/resources/pricing-plans).
</Warning>

<Warning>
  **Chain IDs** - Always use numeric chain IDs (e.g., `1` for Ethereum) or string identifiers (e.g., `solana`). Incorrect chain IDs return errors.
</Warning>

<Warning>
  **Address formats** - Ensure addresses match the chain format (0x-prefixed for EVM, base58 for Solana). Invalid formats cause validation errors.
</Warning>

***

## Need help?

* **Documentation** - Search these docs for detailed guides and API references
* **Support** - Contact us at [uniblock.dev/contact](https://www.uniblock.dev/contact)
* **Dashboard** - Monitor usage and manage projects at [dashboard.uniblock.dev](https://dashboard.uniblock.dev)

***

<Card title="Ready to get started with Uniblock?" icon="rocket" href="https://dashboard.uniblock.dev">
  Create your free account and start building with unified blockchain infrastructure across 100+ chains.
</Card>

<CardGroup cols={2}>
  <Card title="View API reference" icon="book" href="/reference/unified-api-reference-overview">
    Explore all available endpoints and interactive playgrounds
  </Card>

  <Card title="Join our community" icon="discord" href="https://discord.gg/uniblock">
    Get help from our team and connect with other developers
  </Card>
</CardGroup>