An open source typescript SDK, compatible with node and browser, with an easy interface to automate responses from webhooks, subscribed on-chain events and intervals through triggered callback functions and the use of Lit Protocol PKPs.
The LitListenerSDK is designed around the principle of conditionally pre-approved chain reactions with account abstraction.
Check out the documentation for in depth implementation details.
To install the SDK run:
npm i lit-listener-sdk
import { ethers, BigNumber } from "ethers";
import { Circuit } from "lit-listener-sdk";
const chronicleProvider = new ethers.providers.JsonRpcProvider("https://chain-rpc.litprotocol.com/http", 175177);
const chronicleSigner = new ethers.Wallet(YOUR_PRIVATE_KEY, chronicleProvider);
const quickStartCircuit = new Circuit(chronicleSigner);
quickStartCircuit.setConditions([
new ContractCondition(
"0x6968105460f67c3bf751be7c15f92f5286fd0ce5", // contract address
[
{
"anonymous": false,
"inputs": [
{
"indexed": true,
"internalType": "address",
"name": "to",
"type": "address"
},
{
"indexed": false,
"internalType": "uint256",
"name": "value",
"type": "uint256"
}
],
"name": "Transfer",
"type": "event"
},
], // abi
"Transfer", // event name
CHAIN_NAME.polygon, // chainId
"https://your_provider_url_for_this_network", // provider URL
["to", "value"], // event name args
["0x6968105460f67c3bf751be7c15f92f5286fd0ce5",
BigNumber.from("500000")], // expected value
"===", // match operator
async () => { console.log("Matched!"); }, // onMatched function
async () => { console.log("Unmatched!"); }, // onUnMatched function
(error: Error) => { console.log("Error:", error); } // onError function,
), ]);
const {unsignedTransactionDataObject, litActionCode} = await quickStartCircuit.setActions([{
type: "contract",
priority: 2,
contractAddress: "0x6968105460f67c3bf751be7c15f92f5286fd0ce5",
abi: [
{
constant: true,
inputs: [{ name: "numberValue", type: "uint256" }],
name: "your_function_name",
outputs: [{ name: "", type: "uint256" }],
payable: false,
stateMutability: "external",
type: "function",
},
],
functionName: "your_function_name",
chainId: "polygon",
nonce: 1,
gasLimit: 100000,
value: 0,
maxPriorityFeePerGas: 1000,
maxFeePerGas: 10000,
args: [20],
};
]);
// Assuming you have already uploaded the Lit Action Code to IPFS and just need to retrive the hash
const ipfsCID = await quickStartCircuit.getIPFSHash(litActionCode);
const { publicKey, tokenId, address } = await quickStartCircuit.mintGrantBurnPKP(ipfsCID);
await quickStartCircuit.start({publicKey, ipfsCID});
Check out a no code implementation of the SDK live here.