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

# Deposit ETH (L1 → L2)

> Move ETH from Ethereum to TeQoin L2 in ~15 minutes

# Deposit ETH from L1 to L2

Transfer ETH from Ethereum mainnet to TeQoin L2 quickly and safely.

<Note>
  **Quick Facts:**

  * ⏱️ **Time:** \~15 minutes
  * 💰 **L1 Gas Fee:** \$10-50 (varies with Ethereum gas price)
  * 💰 **L2 Fee:** \$0 (covered by bridge)
  * 🔄 **Ratio:** 1 ETH on L1 = 1 ETH on L2
  * ✅ **Cancellable:** No (irreversible once confirmed)
</Note>

***

## 📋 Prerequisites

Before you start, make sure you have:

<Steps>
  <Step title="ETH on Ethereum L1">
    You need ETH on Ethereum mainnet to deposit.

    **Minimum recommended:** 0.01 ETH (to cover gas + deposit amount)
  </Step>

  <Step title="Wallet with L1 Connection">
    * MetaMask installed and connected to **Ethereum Mainnet**
    * Or TeQoin Telegram Wallet
    * Sufficient ETH for gas fees + deposit amount
  </Step>

  <Step title="TeQoin L2 Added to Wallet">
    Add TeQoin L2 network to receive funds

    [Add Network Guide →](/quickstart/add-network)
  </Step>
</Steps>

***

## 🌉 How Deposits Work

### The Process

```mermaid theme={null}
sequenceDiagram
    participant User
    participant L1 Bridge
    participant Sequencer
    participant L2 Bridge
    
    User->>L1 Bridge: Send ETH
    L1 Bridge->>L1 Bridge: Lock ETH
    L1 Bridge->>Sequencer: Emit Deposit Event
    Sequencer->>L2 Bridge: Relay Message
    L2 Bridge->>L2 Bridge: Mint ETH
    L2 Bridge->>User: Credit ETH (L2)
```

**Step-by-step:**

1. **You send ETH** to L1 bridge contract
2. **ETH is locked** on Ethereum L1
3. **Bridge emits event** that sequencer monitors
4. **Sequencer relays** message to L2
5. **L2 mints equivalent ETH** (1:1 ratio)
6. **You receive ETH** on TeQoin L2

**Total time:** \~15 minutes

***

## 🎯 Step-by-Step Guide

### Method 1: Bridge Interface (Recommended)

<Steps>
  <Step title="Visit the Bridge">
    Go to the official TeQoin bridge:

    **🔗 [https://bridge.teqoin.io](https://bridge.teqoin.io)**

    <Warning>
      **Security Alert:** Always verify you're on the official bridge URL. Bookmark it to avoid phishing sites.
    </Warning>
  </Step>

  <Step title="Connect Wallet">
    1. Click **"Connect Wallet"**
    2. Select your wallet (MetaMask, WalletConnect, etc.)
    3. Approve the connection

    **Important:** Make sure you're connected to **Ethereum Mainnet** (not a testnet)

    <Tip>
      Check the network indicator in your wallet. It should show "Ethereum Mainnet" or "Mainnet".
    </Tip>
  </Step>

  <Step title="Select Deposit Tab">
    Click the **"Deposit"** or **"L1 → L2"** tab

    The interface should show:

    * From: Ethereum Mainnet
    * To: TeQoin L2
  </Step>

  <Step title="Enter Amount">
    Enter the amount of ETH you want to deposit

    **Examples:**

    * `0.1` - Deposit 0.1 ETH
    * `1.5` - Deposit 1.5 ETH
    * Click **"Max"** to deposit all available ETH (minus gas)

    <Note>
      **Recommended minimum:** 0.01 ETH

      This ensures the deposit is worthwhile considering L1 gas fees.
    </Note>
  </Step>

  <Step title="Review Transaction Details">
    The bridge will show:

    | Detail                | Information               |
    | --------------------- | ------------------------- |
    | **Amount to Deposit** | ETH you're sending        |
    | **You'll Receive**    | Same amount on L2         |
    | **L1 Gas Fee**        | Ethereum transaction cost |
    | **Estimated Time**    | \~15 minutes              |
    | **Bridge Fee**        | \$0 (no bridge fee)       |

    Review carefully and make sure everything is correct.
  </Step>

  <Step title="Approve Transaction">
    1. Click **"Deposit"** or **"Bridge ETH"**
    2. MetaMask popup appears
    3. Review transaction in MetaMask:
       * **To:** L1 Bridge Contract (`0x919aa27d5278BC98bf40BA5A79be468B91f061dA`)
       * **Amount:** Your deposit amount
       * **Gas Fee:** Ethereum L1 gas cost
    4. Click **"Confirm"** in MetaMask

    <Warning>
      **Double-check the contract address!**

      L1 Bridge: `0x919aa27d5278BC98bf40BA5A79be468B91f061dA`

      If it's different, DO NOT proceed!
    </Warning>
  </Step>

  <Step title="Wait for L1 Confirmation">
    Your transaction is submitted to Ethereum:

    * **Status:** Pending
    * **Time:** 2-5 minutes (depends on gas price)
    * **Confirmations:** Wait for \~12 confirmations

    You'll see:

    * Transaction hash
    * Pending status indicator
    * Link to view on Etherscan

    <Tip>
      Click the transaction hash to track it on Etherscan in real-time.
    </Tip>
  </Step>

  <Step title="Automatic L2 Processing">
    Once L1 transaction confirms:

    1. Bridge detects the deposit event
    2. Sequencer processes the deposit
    3. L2 bridge mints equivalent ETH
    4. ETH appears in your L2 wallet

    **Time:** 5-10 minutes after L1 confirmation

    The bridge interface shows:

    * ✅ L1 transaction confirmed
    * 🔄 Processing on L2
    * ⏳ Waiting for L2 credit
  </Step>

  <Step title="Verify on L2">
    After \~15 minutes total:

    1. Switch to **TeQoin L2** network in your wallet
    2. Check your balance - it should have increased
    3. View transaction on [https://explorer.teqoin.io](https://explorer.teqoin.io)

    ✅ **Deposit Complete!** You now have ETH on TeQoin L2.
  </Step>
</Steps>

***

### Method 2: Direct Contract Interaction (Advanced)

For developers or advanced users who want to interact with the contract directly.

<CodeGroup>
  ```javascript Ethers.js theme={null}
  import { ethers } from 'ethers';

  // Connect to Ethereum L1
  const provider = new ethers.BrowserProvider(window.ethereum);
  const signer = await provider.getSigner();

  // L1 Bridge contract
  const L1_BRIDGE = '0x919aa27d5278BC98bf40BA5A79be468B91f061dA';
  const bridgeABI = [
    'function depositETH() payable'
  ];

  const bridge = new ethers.Contract(L1_BRIDGE, bridgeABI, signer);

  // Deposit 0.1 ETH
  const tx = await bridge.depositETH({
    value: ethers.parseEther('0.1')
  });

  console.log('Deposit transaction:', tx.hash);

  // Wait for confirmation
  const receipt = await tx.wait();
  console.log('Confirmed in block:', receipt.blockNumber);

  // Switch to L2 and check balance after ~15 minutes
  ```

  ```javascript Web3.js theme={null}
  const Web3 = require('web3');

  // Connect to Ethereum L1
  const web3 = new Web3(window.ethereum);

  // Request account access
  await window.ethereum.request({ method: 'eth_requestAccounts' });
  const accounts = await web3.eth.getAccounts();

  // L1 Bridge contract
  const L1_BRIDGE = '0x919aa27d5278BC98bf40BA5A79be468B91f061dA';
  const bridgeABI = [/* ABI */];

  const bridge = new web3.eth.Contract(bridgeABI, L1_BRIDGE);

  // Deposit 0.1 ETH
  const tx = await bridge.methods.depositETH().send({
    from: accounts[0],
    value: web3.utils.toWei('0.1', 'ether')
  });

  console.log('Deposit transaction:', tx.transactionHash);
  ```

  ```bash Cast (Foundry) theme={null}
  # Using Foundry's cast command

  # Deposit 0.1 ETH to L2
  cast send 0x919aa27d5278BC98bf40BA5A79be468B91f061dA \
    "depositETH()" \
    --value 0.1ether \
    --rpc-url https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY \
    --private-key $PRIVATE_KEY

  # Transaction will be sent to Ethereum L1
  # Wait ~15 minutes and check L2 balance
  ```
</CodeGroup>

***

## 💰 Cost Breakdown

### Example: Deposit 1 ETH

```
Amount to Deposit:           1.0 ETH
─────────────────────────────────────
L1 Gas Fee (variable):      ~0.005 ETH ($10-20)
L2 Processing Fee:           0 ETH (free)
Bridge Fee:                  0 ETH (no fee)
─────────────────────────────────────
Total Cost:                 ~0.005 ETH
You Receive on L2:           1.0 ETH

Effective Cost:             ~0.5% (gas only)
```

### Gas Price Optimization

<Tabs>
  <Tab title="When to Bridge">
    **Cheapest times (Ethereum gas is low):**

    * 🌙 Late night (2-6 AM US Eastern Time)
    * 📅 Weekends (Saturday-Sunday)
    * 🏖️ Holidays

    **Most expensive times:**

    * 📈 Weekday afternoons (US trading hours)
    * 🚀 During NFT mints or major events
    * ⏰ Peak DeFi activity hours

    **Check current gas prices:**

    * [https://etherscan.io/gastracker](https://etherscan.io/gastracker)
    * [https://ethereumprice.org/gas/](https://ethereumprice.org/gas/)
  </Tab>

  <Tab title="Gas Price Tiers">
    | Gas Price                 | Cost for Deposit | When to Use           |
    | ------------------------- | ---------------- | --------------------- |
    | **Low** (10-20 gwei)      | \$5-10           | ✅ Best time to bridge |
    | **Medium** (20-50 gwei)   | \$10-25          | 🟡 Acceptable         |
    | **High** (50-100 gwei)    | \$25-50          | 🔴 Wait if possible   |
    | **Very High** (100+ gwei) | \$50+            | ⛔ Avoid unless urgent |
  </Tab>

  <Tab title="Save on Fees">
    **Tips to minimize costs:**

    1. **Bridge larger amounts less frequently**
       * Instead of 10 deposits of 0.1 ETH (\$100 total gas)
       * Do 1 deposit of 1 ETH (\$10 gas)

    2. **Use gas price alerts**
       * Set up alerts on Etherscan
       * Get notified when gas is cheap

    3. **Be patient**
       * Don't bridge during network congestion
       * Wait for low gas periods

    4. **Plan ahead**
       * Bridge when you don't need funds immediately
       * Use slow gas option if not urgent
  </Tab>
</Tabs>

***

## 📊 Tracking Your Deposit

### On the Bridge Interface

The bridge shows deposit status:

```
✅ Step 1: Transaction Submitted
⏳ Step 2: Waiting for L1 Confirmation (2-5 min)
⏳ Step 3: Processing on L2 (5-10 min)
⏳ Step 4: ETH Credited to L2
```

### On Block Explorers

<Tabs>
  <Tab title="Ethereum (L1)">
    **View L1 transaction:**

    1. Go to [https://etherscan.io](https://etherscan.io)
    2. Paste your transaction hash
    3. Verify:
       * ✅ Status: Success
       * ✅ To: L1 Bridge Contract
       * ✅ Value: Your deposit amount
       * ✅ Confirmations: 12+
  </Tab>

  <Tab title="TeQoin (L2)">
    **View L2 credit:**

    1. Go to [https://explorer.teqoin.io](https://explorer.teqoin.io)
    2. Search your wallet address
    3. Look for:
       * Transaction from L2 Bridge
       * Amount matching your deposit
       * Type: "Deposit from L1"
  </Tab>
</Tabs>

***

## 🔧 Troubleshooting

<AccordionGroup>
  <Accordion title="Deposit stuck on 'Pending' for over 30 minutes">
    **Possible causes:**

    * L1 transaction hasn't confirmed yet
    * Used too low gas price
    * Network congestion on Ethereum

    **Solution:**

    1. Check L1 transaction on Etherscan
    2. If still pending on L1:
       * Wait longer (may take hours with low gas)
       * Or speed up with higher gas (MetaMask "Speed Up" option)
    3. If L1 confirmed but not on L2:
       * Wait another 30 minutes
       * Check bridge status page
       * Contact support with TX hash
  </Accordion>

  <Accordion title="Transaction failed on L1">
    **Common reasons:**

    * Insufficient ETH for gas
    * Too low gas limit
    * Network error

    **Solution:**

    1. Check error message on Etherscan
    2. If "out of gas": Retry with higher gas limit
    3. If "insufficient funds": Add more ETH and retry
    4. Your deposit was NOT processed - funds are still on L1
  </Accordion>

  <Accordion title="ETH not showing on L2 after 1 hour">
    L1 confirmed but L2 credit delayed.

    **Solution:**

    1. Verify L1 transaction succeeded on Etherscan
    2. Check your L2 wallet address is correct
    3. Make sure you're on TeQoin L2 network
    4. Refresh wallet (disconnect/reconnect)
    5. Check explorer.teqoin.io for incoming transaction
    6. If still missing after 2 hours, contact support
  </Accordion>

  <Accordion title="Wrong network - sent on testnet">
    Accidentally used Sepolia or another testnet.

    **Solution:**

    * Testnet ETH has no value - this is expected
    * Mainnet and testnet are completely separate
    * For mainnet deposits, connect to Ethereum Mainnet
    * Your funds are not lost, just on the wrong network
  </Accordion>

  <Accordion title="Sent ETH directly to bridge contract (not via interface)">
    Manually sent ETH to contract address without calling depositETH().

    **Solution:**

    * If you called depositETH(): Should process normally
    * If you sent plain ETH transfer: Funds may be stuck
    * Contact support immediately with transaction hash
    * May be recoverable depending on the situation

    **Always use the bridge interface to avoid this!**
  </Accordion>

  <Accordion title="Want to cancel deposit">
    **Deposits cannot be cancelled** once the L1 transaction is confirmed.

    **Options:**

    * Let it complete (\~15 minutes)
    * Once on L2, you can withdraw back to L1 (7 days)
    * Or keep funds on L2 for low-fee transactions
  </Accordion>
</AccordionGroup>

***

## ✅ Post-Deposit Checklist

After your deposit completes:

<Steps>
  <Step title="Verify L2 Balance">
    ```bash theme={null}
        1. Switch to TeQoin L2 in wallet
        2. Check balance increased by deposit amount
        3. Note: Balance might not update instantly - refresh wallet
    ```
  </Step>

  <Step title="Save Transaction Records">
    ```bash theme={null}
        # Keep these for your records:
        - L1 transaction hash
        - L2 transaction hash
        - Deposit amount
        - Date and time
        - Bridge used
    ```
  </Step>

  <Step title="Start Using L2">
    Now you can:

    * Make low-fee transactions
    * Deploy smart contracts
    * Use TeQoin dApps
    * Trade on DEXs

    [First Transaction Guide →](/quickstart/first-transaction)
  </Step>
</Steps>

***

## 💡 Best Practices

<Tip>
  **Test with Small Amount First**

  For your first deposit:

  1. Send a small amount (0.01 ETH)
  2. Verify it arrives on L2
  3. Then deposit larger amounts
</Tip>

<Tip>
  **Keep Some ETH on L1**

  Don't deposit all your ETH to L2:

  * Keep some on L1 for gas fees
  * You might need L1 ETH for future deposits
  * Withdrawals back to L1 take 7 days
</Tip>

<Tip>
  **Document Everything**

  Keep records of:

  * Transaction hashes
  * Amounts deposited
  * Dates
  * Wallet addresses used

  This helps with:

  * Tax reporting
  * Troubleshooting
  * Portfolio tracking
</Tip>

***

## 🎯 Next Steps

<CardGroup cols={2}>
  <Card title="Make Your First Transaction" icon="paper-plane" href="/quickstart/first-transaction">
    Use your L2 ETH to make low-fee transactions
  </Card>

  <Card title="Withdraw to L1" icon="arrow-up" href="/bridge/withdraw-l2-to-l1">
    Learn how to move ETH back to Ethereum
  </Card>

  <Card title="Deploy a Contract" icon="code" href="/developers/deploy-contract">
    Use your L2 ETH to deploy smart contracts
  </Card>

  <Card title="Bridge FAQ" icon="circle-question" href="/bridge/faq">
    Common questions about bridging
  </Card>
</CardGroup>

***

**Deposit successful?** Start making [low-fee transactions on TeQoin L2](/quickstart/first-transaction)! 🚀