gleeth/gas

Gas estimation helpers for legacy and EIP-1559 transactions.

These functions combine multiple RPC calls to produce a complete gas estimate that can be passed directly to a transaction builder.

Types

Eip1559GasEstimate

</>

Gas estimate for an EIP-1559 (Type 2) transaction.

pub type Eip1559GasEstimate {
  Eip1559GasEstimate(
    max_fee_per_gas: String,
    max_priority_fee_per_gas: String,
    gas_limit: String,
  )
}

Constructors

Eip1559GasEstimate(
  max_fee_per_gas: String,
  max_priority_fee_per_gas: String,
  gas_limit: String,
)

LegacyGasEstimate

</>

Gas estimate for a legacy (pre-EIP-1559) transaction.

pub type LegacyGasEstimate {
  LegacyGasEstimate(gas_price: String, gas_limit: String)
}

Constructors

LegacyGasEstimate(gas_price: String, gas_limit: String)

Values

estimate_eip1559

</>

pub fn estimate_eip1559(
  provider: provider.Provider,
  from: String,
  to: String,
  value: String,
  data: String,
) -> Result(Eip1559GasEstimate, types.GleethError)

Estimate gas for an EIP-1559 transaction by fetching priority fee, base fee from fee history, and gas limit. Computes max_fee = 2 * base_fee + priority_fee.

Examples

let sender = wallet.get_address(w)
let to = "0x70997970C51812dc3A010C7d01b50e0d17dc79C8"

let assert Ok(est) = gas.estimate_eip1559(provider, sender, to, "0xde0b6b3a7640000", "0x")

// Use the estimate in a Type 2 transaction
let assert Ok(tx) = transaction.create_eip1559_transaction(
  to, "0xde0b6b3a7640000",
  est.gas_limit, est.max_fee_per_gas, est.max_priority_fee_per_gas,
  nonce, "0x", 1,
)

estimate_legacy

</>

pub fn estimate_legacy(
  provider: provider.Provider,
  from: String,
  to: String,
  value: String,
  data: String,
) -> Result(LegacyGasEstimate, types.GleethError)

Estimate gas for a legacy transaction by fetching gas price and gas limit.

Combines eth_gasPrice and eth_estimateGas into a single call. The returned LegacyGasEstimate has gas_price and gas_limit as hex strings, ready to pass to transaction.create_legacy_transaction.

Examples

let sender = wallet.get_address(w)
let to = "0x70997970C51812dc3A010C7d01b50e0d17dc79C8"

let assert Ok(est) = gas.estimate_legacy(provider, sender, to, "0xde0b6b3a7640000", "0x")

// Use the estimate in a transaction
let assert Ok(tx) = transaction.create_legacy_transaction(
  to, "0xde0b6b3a7640000", est.gas_limit, est.gas_price, nonce, "0x", 1,
)