Transaction Format

A Kairos transaction, or fastBid, is a single hexadecimal encoded transaction (see Relay JSON-RPC API for more information)

Example:

Javascript

// Check next doc page of `submitFastBid`
// for ethers implementation instead

const Web3 = require('web3');

var web3 = new Web3(
  'https://matic-mainnet.infura.io/v3/some_random_hash_provider'
);

const PRIVATE_KEY = '0xsomePrivateKey';

const functionCall = {
  inputs: [
    {
      internalType: 'uint256',
      name: 'fastGasPrice',
      type: 'uint256'
    },
    {
      internalType: 'address',
      name: 'searcherToAddress',
      type: 'address'
    },
    {
      internalType: 'bytes',
      name: 'searcherCallData',
      type: 'bytes'
    }
  ],
  name: 'submitFastBid',
  outputs: [],
  stateMutability: 'payable',
  type: 'function'
};

const fastGasPrice = 10 * 1e9; // 10 gwei
const searcherContract = '0xeA26974363EC1dBc132C99cF9A29273B17254aE3';

// Assuming we intend to use _searcherCallDataBytes
// when received on our searcher contract `fastLaneCall(` callback
// to then trigger searcherContract.myMethod(uint256,string);

// See: Searcher Call Data section of the docs for more informations
const searcherCallDataBytes = web3.eth.abi.encodeFunctionCall(
  {
    name: 'myMethod',
    type: 'function',
    inputs: [
      {
        type: 'uint256',
        name: 'myNumber'
      },
      {
        type: 'string',
        name: 'myString'
      }
    ]
  },
  ['2345675643', 'Hello!%']
);

const dataField = web3.eth.abi.encodeFunctionCall(functionCall, [
  fastGasPrice,
  searcherContract,
  searcherCallDataBytes
]);

// Gas must match
const transaction = {
  to: '0xf5df545113dee4df10f8149090aa737ddc05070a', // Auction Handler Beta
  nonce: 12,
  data: dataField
};

async function main() {
  const signedTx = await web3.eth.accounts.signTransaction(
    transaction,
    PRIVATE_KEY
  );
  console.log(signedTx.rawTransaction); // 0xf901b20c8502e155e78c8275309431b98d14007bdee637298086988a0bbd...1baddd8f2f8f940fc5d387832a1
  return signedTx.rawTransaction;
}

main();

More details in

submitFastBid

Full Example

Python

from web3 import Web3

signed_encoded_tx = signed_tx.rawTransaction.hex()