Transaction Types

KalyChain supports multiple transaction formats, each with different features and use cases.

Overview

Transaction types are specified by the transactionType parameter and affect:

Available parameters
Fee calculation
Gas optimization capabilities

FRONTIER Transactions (Legacy)

Type identifier: 0x0 or omitted

Legacy transactions use the original Ethereum transaction format from before EIP-2718 typed transactions.

Parameters

Parameter	Type	Description
`nonce`	Integer	Transaction sequence number
`gasPrice`	Integer	Wei per gas unit
`gasLimit`	Integer	Maximum gas units
`to`	Address	Recipient (null for deployment)
`value`	Integer	Wei to transfer
`data`	Bytes	Input data
`v`, `r`, `s`	Signature	Transaction signature
`chainId`	Integer	Network identifier

Example

{
  "nonce": "0x1",
  "gasPrice": "0x3b9aca00",
  "gasLimit": "0x5208",
  "to": "0x742d35Cc6634C0532925a3b844Bc9e7595f2bD2b",
  "value": "0xde0b6b3a7640000",
  "data": "0x",
  "chainId": "0xf30"
}

Use Cases

Simple transfers
Compatibility with older tooling
When gas price stability is acceptable

ACCESS_LIST Transactions (EIP-2930)

Type identifier: 0x1

Introduced in EIP-2930, these transactions include an access list specifying storage slots the transaction will access.

Parameters

All legacy parameters, plus:

Parameter	Type	Description
`accessList`	Array	Addresses and storage keys to access

Access List Structure

{
  "accessList": [
    {
      "address": "0xContractAddress",
      "storageKeys": [
        "0x0000000000000000000000000000000000000000000000000000000000000001",
        "0x0000000000000000000000000000000000000000000000000000000000000002"
      ]
    }
  ]
}

Benefits

Gas Savings — Pre-declaring accessed storage reduces warm access costs.
Predictable Execution — Transaction specifies exactly what it will access.

When to Use

Complex DeFi interactions touching multiple contracts.
Batch operations accessing known storage slots.
Gas optimization for high-value transactions.

EIP-1559 Transactions

Type identifier: 0x2

Introduced in EIP-1559, these transactions use a dynamic fee market with a base fee that adjusts based on network demand.

Parameters

Access list parameters, plus new fee parameters (replacing gasPrice):

Parameter	Type	Description
`maxPriorityFeePerGas`	Integer	Maximum tip to validator
`maxFeePerGas`	Integer	Maximum total fee (base + priority)

Fee Calculation

The transaction pays:

fee = gasUsed × effectiveGasPrice

where effectiveGasPrice = min(baseFee + maxPriorityFeePerGas, maxFeePerGas)

Component	Destination
Base Fee	Burned (removed from supply)
Priority Fee	Paid to block validator

Example

{
  "type": "0x2",
  "nonce": "0x1",
  "maxPriorityFeePerGas": "0x3b9aca00",
  "maxFeePerGas": "0x77359400",
  "gasLimit": "0x5208",
  "to": "0x742d35Cc6634C0532925a3b844Bc9e7595f2bD2b",
  "value": "0xde0b6b3a7640000",
  "data": "0x",
  "accessList": [],
  "chainId": "0xf30"
}

Benefits

More Predictable Fees — Base fee adjusts smoothly.
Reduced Overpayment — Pay only what's needed.
Better UX — Wallets can estimate fees more accurately.

When to Use

General use — recommended for most transactions.
When fee predictability is important.
Modern wallets default to EIP-1559.

API Object Formats

Different API responses use transaction type-specific formats:

Transaction Object

Returned by eth_getTransactionByHash, etc.

Transaction Receipt Object

Returned by eth_getTransactionReceipt.

Transaction Call Object

Used in eth_call and eth_estimateGas.