@kadena/client-utils

Utility functions build as a wrapper around @kadena/client

Kadena client utils

Introducing @kadena/client-utils, a library that aims to provide a higher-level API for interacting with smart contracts. The library includes helpers for the coin module, which can be imported using @kadena/client-utils/coin. The library also exports utilities under /core for smart contract developers to develop APIs, including some functions that can be used for any kind of smart contracts.

Find a minimal interactive example at CodeSandbox

• asyncPipe
• submitClient
• preflightClient
• dirtyReadClient
• crossChainClient

examples

import { getBalance, transferCrossChain } from "@kadena/client-utils/coin"
import { signWithChainweaver } from "@kadena/client"

const balance = await getBalance(
  accountOne.account,
  'development',
  '0',
  'http://localhost:8080',
 );

 const result = await createAccount(
  {
    account: 'javad',
    keyset: {
      pred: 'keys-all',
      keys: ['key-a', 'key-b'],
    },
    gasPayer: { account: 'gasPayer', publicKeys: [''] },
    chainId: '0',
  },
  {
    host: 'https://api.testnet.chainweb.com',
    defaults: {
      networkId: 'testnet04',
    },
    sign: signWithChainweaver,
  },
)
   // signed Tx
  .on('sign', (data) => console.log(data))
  // preflight result
  .on('preflight', (data) => console.log(data))
  // submit result
  .on('submit', (data) => console.log(data))
  // listen result
  .on('listen', (data) => console.log(data))
  .execute();

Gas Price Estimation

This module also provides tools for estimating optimal gas prices and analyzing gas usage from recent blocks on the Kadena blockchain.

import {
  estimateGasPrice,
  getBlocksGasInformation,
} from '@kadena/client-utils';

estimateGasPrice

Estimates a suitable gas price by analyzing recent block data. The estimated value is the median of the minimum gas prices from a set of 20 recent blocks, after filtering out any empty blocks.

Signature

estimateGasPrice(parameters: IGasPriceEstimateProperties): Promise<number>

Parameters

• host? (string): Optional base URL of the Chainweb API (defaults to Kadena's mainnet/testnet based on networkId).
• chainId (string): Chain ID (e.g., "0" through "19").
• networkId? (string): Network ID (e.g., "mainnet01", "testnet04" - default "mainnet01" ).
• height? (number): Optional block max height ( default the chian height).
• items? (number): Number of blocks to fetch (default: 20).

Returns

• Promise<number>: Estimated gas price (defaults to 1e-7 if no transactions are found).

Example

const price = await estimateGasPrice({
  chainId: '0',
  networkId: 'mainnet01',
});
console.log(`Suggested gas price: ${price}`);

---

getBlocksGasInformation

Fetches recent block data and returns gas usage statistics for each block. This information can be used to estimate gas prices based on custom criteria.

Signature

getBlocksGasInformation(parameters: IGasPriceEstimateProperties): Promise<IBlockGasInformation[]>

Parameters

• host? (string): Optional base URL of the Chainweb API (defaults to Kadena's mainnet/testnet based on networkId).
• chainId (string): Chain ID (e.g., "0" through "19").
• networkId? (string): Network ID (e.g., "mainnet01", "testnet04" - default "mainnet01" ).
• height? (number): Optional block max height ( default the chian height).
• items? (number): Number of blocks to fetch (default: 20).

Returns

• Promise<IBlockGasInformation[]>: Array of gas information objects per block.

Example

const blocks = await getBlocksGasInformation({
  chainId: '0',
  networkId: 'mainnet01',
});
console.log(blocks);

IBlockGasInformation Structure

Each block's gas info includes:

• blockHeight: Block number
• totalGasConsumed: Sum of actual gas used by all txs
• totalGasLimit: Sum of declared gas limits
• totalGasPaid: Total gasPrice * gasLimit of all txs
• txCount: Number of transactions
• blockGasUsedPercent: Gas usage vs block capacity
• gasPriceStats:
  • min: Minimum gas price
  • max: Maximum gas price
  • avg: Average gas price
  • median: Median gas price

Notes

• Uses https://api.chainweb.com for mainnet and https://api.testnet.chainweb.com for testnet by default.
• Block gas capacity is assumed as 150000.
• Skips blocks with zero transactions when estimating gas price.