EffectiveGasPrice

import * as EffectiveGasPrice from 'voltaire-effect/EffectiveGasPrice'
import { Effect } from 'effect'

// Create from wei
const price = Effect.runSync(EffectiveGasPrice.from(30000000000n))

// Create from gwei
const priceGwei = Effect.runSync(EffectiveGasPrice.fromGwei(30n))

// Calculate: min(baseFee + priorityFee, maxFeePerGas)
const effective = Effect.runSync(EffectiveGasPrice.calculate(
  20n * 10n**9n,  // baseFee: 20 gwei
  2n * 10n**9n,   // priorityFee: 2 gwei
  30n * 10n**9n   // maxFeePerGas: 30 gwei
)) // → 22 gwei

const txCost = (baseFee: bigint, tip: bigint, maxFee: bigint, gas: bigint) =>
  Effect.gen(function* () {
    const price = yield* EffectiveGasPrice.calculate(baseFee, tip, maxFee)
    return price * gas
  })