eth_estimateL1Fee | Mantle RPC Docs

Estimate L1 data posting fee on Mantle Network. Essential for understanding transaction costs on the modular L2 rollup.

Estimate L1 data posting fee on the Mantle network. This method helps calculate the additional cost of posting transaction data to Ethereum L1 via EigenDA as part of Mantle's modular L2 architecture.

Overview

Mantle's modular L2 is an optimistic rollup that periodically submits batched transaction data to Ethereum L1 through EigenDA for data availability. While most transaction execution happens on L2 with low gas costs paid in MNT, there's an additional fee component for the L1 data availability costs.

Request Parameters

Request

transactionObject

Transaction object to estimate L1 fee for

Response Body

Response

resultQUANTITY

Estimated L1 fee in wei

curl -X POST https://api-mantle-mainnet.n.dwellir.com/YOUR_API_KEY \\      -H "Content-Type: application/json" \\      -d '{        "jsonrpc": "2.0",        "method": "eth_estimateL1Fee",        "params": [          {            "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb5",            "to": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",            "gas": "0x5208",            "gasPrice": "0x3b9aca00",            "value": "0x1bc16d674ec80000",            "data": "0x"          }        ],        "id": 1      }'

{  "jsonrpc": "2.0",  "id": 1,  "result": "0x1c6bf526340"}

Implementation Example

Bash

curl -X POST https://api-mantle-mainnet.n.dwellir.com/YOUR_API_KEY \\
  -H "Content-Type: application/json" \\
  -d '{
    "jsonrpc": "2.0",
    "method": "eth_estimateL1Fee",
    "params": [
      {
        "from": "0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb5",
        "to": "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913",
        "gas": "0x5208",
        "gasPrice": "0x3b9aca00",
        "value": "0x1bc16d674ec80000",
        "data": "0x"
      }
    ],
    "id": 1
  }'

Understanding L1 Fees on Mantle

Fee Components

L2 Execution Fee: Standard gas cost for transaction execution on Mantle (paid in MNT)
L1 Data Fee: Cost of posting transaction data to Ethereum L1 via EigenDA for data availability

Data Size Impact

L1 fees scale with transaction data size:

Simple transfers: Minimal L1 fee
Contract interactions: Moderate L1 fee based on calldata
Large data payloads: Significant L1 fee component

Cost Optimization Strategies

Minimize Data: Reduce unnecessary data in transactions
Batch Operations: Combine multiple operations into single transaction
Use Events: Emit events instead of storing large data on-chain
Optimize Encoding: Use efficient data encoding methods
Leverage EigenDA: Benefit from efficient data availability

Common Use Cases

1. Transaction Cost Planning

JavaScript

// Plan transaction costs before execution
async function planTransactionCosts(transactions) {
  const feeEstimator = new MantleFeeEstimator(rpcUrl);
  const plans = [];
  
  for (const tx of transactions) {
    const breakdown = await feeEstimator.getFullFeeBreakdown(tx);
    plans.push({
      transaction: tx,
      estimatedCost: breakdown.totalEstimatedCost,
      l1FeeRatio: breakdown.breakdown.l1FeePercentage,
      recommendation: breakdown.breakdown.l1FeePercentage > 70 ? 
        'Consider batching or data optimization' : 'Cost efficient'
    });
  }
  
  return plans.sort((a, b) => a.estimatedCost - b.estimatedCost);
}

2. Data Optimization Analysis

Python

def optimize_contract_call_data(base_transaction, data_variations):
    """Find most cost-effective data encoding"""
    
    fee_estimator = MantleFeeEstimator(rpc_url)
    results = []
    
    for name, data in data_variations.items():
        tx = {**base_transaction, 'data': data}
        breakdown = fee_estimator.get_full_fee_breakdown(tx)
        
        results.append({
            'encoding': name,
            'data_size': len(data) // 2 - 1,  # Hex bytes
            'total_cost': breakdown['total_estimated_cost'],
            'l1_fee': breakdown['l1_fee'],
            'efficiency': breakdown['l1_fee'] / (len(data) // 2 - 1)
        })
    
    # Sort by total cost
    return sorted(results, key=lambda x: x['total_cost'])

eth_estimateGas - Estimate L2 execution gas
eth_gasPrice - Get current L2 gas price
eth_feeHistory - Historical fee data

Need help? Contact our support team or check the Mantle documentation.

eth_estimateL1Fee - Estimate L1 data posting fee