Transaction.getGasPrice

Get effective gas price for transaction

Try it Live

Run Transaction examples in the interactive playground

getGasPrice

Get effective gas price for transaction.

Gas Price Calculation

Legacy & EIP-2930 Transactions

Fixed gas price model:

getGasPrice(tx) = tx.gasPrice

Simple and predictable - users specify exact gas price willing to pay.

EIP-1559, EIP-4844, EIP-7702 Transactions

Dynamic fee market:

effectiveGasPrice = min(
  maxFeePerGas,
  baseFee + maxPriorityFeePerGas
)

Components:

• baseFee - Current network base fee (burned)
• maxPriorityFeePerGas - Maximum tip to miner
• maxFeePerGas - Maximum total willing to pay

Examples:

// Scenario 1: Normal conditions
baseFee = 15 gwei
maxPriorityFeePerGas = 2 gwei
maxFeePerGas = 30 gwei

effectiveGasPrice = min(30, 15 + 2) = 17 gwei

// Scenario 2: High congestion
baseFee = 100 gwei
maxPriorityFeePerGas = 2 gwei
maxFeePerGas = 30 gwei

effectiveGasPrice = min(30, 100 + 2) = 30 gwei  // Capped at maxFee

// Scenario 3: Priority fee adjustment
baseFee = 20 gwei
maxPriorityFeePerGas = 15 gwei
maxFeePerGas = 50 gwei

effectiveGasPrice = min(50, 20 + 15) = 35 gwei

Usage Patterns

Transaction Cost Estimation

import { getGasPrice } from 'tevm/Transaction'

async function estimateTransactionCost(
  tx: Transaction.Any,
  baseFee?: bigint
): Promise<bigint> {
  const gasPrice = getGasPrice(tx, baseFee)
  const gasLimit = tx.gasLimit

  return gasPrice * gasLimit + tx.value
}

// Usage
const cost = await estimateTransactionCost(tx, currentBaseFee)
console.log(`Estimated cost: ${cost} wei`)

Gas Price Comparison

import { getGasPrice } from 'tevm/Transaction'

function compareGasPrices(
  tx1: Transaction.Any,
  tx2: Transaction.Any,
  baseFee: bigint
): number {
  const price1 = getGasPrice(tx1, baseFee)
  const price2 = getGasPrice(tx2, baseFee)

  if (price1 < price2) return -1
  if (price1 > price2) return 1
  return 0
}

// Sort transactions by gas price
const sorted = transactions.sort((a, b) =>
  compareGasPrices(a, b, currentBaseFee)
)

Balance Validation

import { getGasPrice } from 'tevm/Transaction'

async function validateBalance(
  tx: Transaction.Any,
  senderAddress: AddressType,
  baseFee: bigint
): Promise<boolean> {
  const balance = await getBalance(senderAddress)
  const gasPrice = getGasPrice(tx, baseFee)
  const totalCost = gasPrice * tx.gasLimit + tx.value

  return balance >= totalCost
}

Transaction Pool Sorting

import { getGasPrice } from 'tevm/Transaction'

class TransactionPool {
  sortByGasPrice(baseFee: bigint): Transaction.Any[] {
    return this.transactions.sort((a, b) => {
      const priceA = getGasPrice(a, baseFee)
      const priceB = getGasPrice(b, baseFee)
      return Number(priceB - priceA)  // Descending order
    })
  }
}

EIP-1559 Gas Price Components

import { getGasPrice } from 'tevm/Transaction'

function getGasPriceBreakdown(
  tx: Transaction.EIP1559,
  baseFee: bigint
) {
  const effectiveGasPrice = getGasPrice(tx, baseFee)
  const effectivePriorityFee = effectiveGasPrice - baseFee

  return {
    baseFee,
    priorityFee: effectivePriorityFee,
    totalGasPrice: effectiveGasPrice,
    maxFeePerGas: tx.maxFeePerGas,
    maxPriorityFeePerGas: tx.maxPriorityFeePerGas,
    refund: tx.maxFeePerGas - effectiveGasPrice  // Amount refunded
  }
}

// Usage
const breakdown = getGasPriceBreakdown(tx, baseFee)
console.log(`Paying: ${breakdown.totalGasPrice} wei/gas`)
console.log(`Refund: ${breakdown.refund} wei/gas`)

See Also

• getChainId - Extract chain ID from transaction
• format - Format transaction for display
• FeeMarket - Base fee and priority fee calculations
• GasConstants - Gas cost constants

References

• EIP-1559: Fee market change for ETH 1.0 chain
• EIP-2930: Optional access lists
• Yellow Paper: Transaction Gas