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

# Smart Contract Indexing

> 35 supported chains for smart contract indexing

## Overview

Cryptique indexes smart contract transactions, events, and interactions across **35 blockchains**. Add your contract address, and we automatically index all historical and real-time transactions.

***

## Supported Chains

### Ethereum & L2s

| Chain         | Chain ID | Type    |
| ------------- | -------- | ------- |
| Ethereum      | 1        | Mainnet |
| Optimism (OP) | 10       | L2      |
| Arbitrum One  | 42161    | L2      |
| Arbitrum Nova | 42170    | L2      |
| Base          | 8453     | L2      |
| zkSync        | 324      | L2      |
| Linea         | 59144    | L2      |
| Scroll        | 534352   | L2      |
| Blast         | 81457    | L2      |
| Taiko         | 167000   | L2      |
| Abstract      | 2741     | L2      |
| Unichain      | 130      | L2      |

### BNB Ecosystem

| Chain           | Chain ID | Type    |
| --------------- | -------- | ------- |
| BNB Smart Chain | 56       | Mainnet |
| opBNB           | 204      | L2      |

### Polygon Ecosystem

| Chain   | Chain ID | Type    |
| ------- | -------- | ------- |
| Polygon | 137      | Mainnet |

### Alternative L1s

| Chain             | Chain ID | Type |
| ----------------- | -------- | ---- |
| Avalanche C-Chain | 43114    | L1   |
| Gnosis            | 100      | L1   |
| Celo              | 42220    | L1   |
| Moonbeam          | 1284     | L1   |
| Moonriver         | 1285     | L1   |
| Sonic             | 146      | L1   |
| Sei               | 1329     | L1   |
| Berachain         | 80094    | L1   |
| Monad             | 143      | L1   |
| Mantle            | 5000     | L1   |
| Fraxtal           | 252      | L1   |

### Specialized Chains

| Chain      | Chain ID | Type          |
| ---------- | -------- | ------------- |
| Soneium    | 1946     | L2 (Sony)     |
| ApeChain   | 33139    | L2 (NFT)      |
| World      | 480      | L2 (World ID) |
| Katana     | 747474   | L2            |
| HyperEVM   | 999      | L2            |
| Stable     | 988      | L2            |
| Swellchain | 1923     | L2            |

### Other Networks

| Chain            | Chain ID | Type |
| ---------------- | -------- | ---- |
| XDC              | 50       | L1   |
| BitTorrent Chain | 199      | L1   |

***

## Complete Chain Reference

| Chain             | Chain ID |
| ----------------- | -------- |
| Ethereum          | 1        |
| Optimism          | 10       |
| XDC               | 50       |
| BNB Smart Chain   | 56       |
| Gnosis            | 100      |
| Unichain          | 130      |
| Polygon           | 137      |
| Monad             | 143      |
| Sonic             | 146      |
| BitTorrent Chain  | 199      |
| opBNB             | 204      |
| Fraxtal           | 252      |
| zkSync            | 324      |
| World             | 480      |
| HyperEVM          | 999      |
| Stable            | 988      |
| Moonbeam          | 1284     |
| Moonriver         | 1285     |
| Sei               | 1329     |
| Soneium           | 1946     |
| Swellchain        | 1923     |
| Abstract          | 2741     |
| Mantle            | 5000     |
| Base              | 8453     |
| ApeChain          | 33139    |
| Arbitrum One      | 42161    |
| Arbitrum Nova     | 42170    |
| Celo              | 42220    |
| Avalanche C-Chain | 43114    |
| Linea             | 59144    |
| Blast             | 81457    |
| Berachain         | 80094    |
| Taiko             | 167000   |
| Scroll            | 534352   |
| Katana            | 747474   |

***

## Adding a Smart Contract

<Steps>
  <Step title="Navigate to Settings">
    Go to **Settings → Contracts** in your [dashboard](https://app.cryptique.io).
  </Step>

  <Step title="Click Add Contract">
    Click the **Add Contract** button.
  </Step>

  <Step title="Enter Contract Details">
    Fill in the required information:

    | Field                | Description                      | Example     |
    | -------------------- | -------------------------------- | ----------- |
    | **Contract Address** | The deployed contract address    | `0x1f98...` |
    | **Contract Name**    | Friendly name for identification | `My Token`  |
    | **Token Symbol**     | Symbol (if applicable)           | `MTK`       |
    | **Chain**            | Select from dropdown             | Ethereum    |
    | **Decimals**         | Token decimal places             | `18`        |
  </Step>

  <Step title="Save & Index">
    Click **Save**. Cryptique automatically:

    * Detects the contract type (ERC-20, ERC-721, ERC-1155, custom)
    * Indexes all historical transactions from deployment
    * Begins real-time monitoring (15-second sync)
  </Step>
</Steps>

***

## Contract Limits by Plan

| Plan       | Contract Limit |
| ---------- | -------------- |
| Free       | 1 contract     |
| Starter    | Unlimited      |
| Pro        | Unlimited      |
| Enterprise | Unlimited      |

<Note>
  The limiting factor for Starter and Pro plans is **API calls**, not contract count. Each transaction fetch counts as an API call.
</Note>

***

## What Gets Indexed

For each contract, Cryptique indexes:

| Data                | Description                                     |
| ------------------- | ----------------------------------------------- |
| **Transactions**    | All transactions involving the contract         |
| **Events**          | All emitted events (Transfer, Approval, custom) |
| **Method Calls**    | Which functions were called                     |
| **Value Transfers** | ETH/native token transfers                      |
| **Token Transfers** | ERC-20/721/1155 transfers                       |
| **Gas Data**        | Gas used, gas price                             |
| **Block Data**      | Block number, timestamp                         |
| **Status**          | Success/failure                                 |

***

## Indexing Timeline

| Stage                   | Timeline                                         |
| ----------------------- | ------------------------------------------------ |
| **Contract Added**      | Immediate                                        |
| **Historical Backfill** | Minutes to hours (depends on transaction volume) |
| **Real-Time Sync**      | 15 seconds                                       |

<Info>
  High-volume contracts (millions of transactions) may take longer to fully backfill. Real-time sync starts immediately regardless.
</Info>

***

## Supported Contract Types

Cryptique auto-detects and optimizes indexing for:

| Type         | Description                |
| ------------ | -------------------------- |
| **ERC-20**   | Fungible tokens            |
| **ERC-721**  | NFTs (non-fungible tokens) |
| **ERC-1155** | Multi-token standard       |
| **Custom**   | Any contract with events   |

For custom contracts, all emitted events are indexed regardless of type.

***

## Use Cases

### Track Token Transfers

Monitor all transfers of your token:

```
Contract: Your ERC-20 token
Events: Transfer(from, to, value)
```

### NFT Activity

Track mints, sales, and transfers:

```
Contract: Your NFT collection
Events: Transfer, Approval, ApprovalForAll
```

### DeFi Protocol

Monitor swaps, liquidity, and positions:

```
Contract: Your DEX or lending pool
Events: Swap, Deposit, Withdraw, Liquidation
```

### Governance

Track votes and proposals:

```
Contract: Your governance contract
Events: ProposalCreated, VoteCast, ProposalExecuted
```

***

## Linking On-Chain to Off-Chain

When a wallet that's connected to your dApp makes a transaction on your contract:

1. Transaction is indexed by Cryptique
2. Wallet address is matched to user session
3. Transaction appears in user's unified profile
4. You see: `User visited /swap → entered amount → confirmed → transaction 0x123 succeeded`

This is the core value of Cryptique—automatic linking of behavior to transactions.

***

## Related Pages

<CardGroup cols={2}>
  <Card title="Chain Overview" icon="link" href="/integrations/overview">
    Feature comparison by chain
  </Card>

  <Card title="Wallet Enrichment" icon="wallet" href="/integrations/wallet-enrichment">
    Get wallet portfolio data
  </Card>
</CardGroup>