ZKpay Javascript SDK

The official ZKpay Javascript SDK by Space and time labs.

library designed to interact with ZKpay contracts on testnet. It provides methods to buy credit with native tokens and ERC-20 tokens, manage token approvals, and handle authentication.

Installation and Running

To install ZKpay, use npm or yarn:

npm install zkpay

or

yarn add zkpay

As a package for typescript project

Initiate ZKpay instance:

import { ZKpay, ethers } from "zkpay";

const main = async () => {
    const provider = new ethers.JsonRpcProvider('https://sepolia.infura.io/v3/');
    const signer = new ethers.Wallet(privateKey, provider);

    // Define the chain ID (e.g., 11155111 for sepolia)
    const zkpay = new ZKpay(signer, 11155111); // sepolia

    try {
        const tx = await zkpay.buyWithNative(20n, '0x3077Bf667dBD81d3c718684Da4DE4Dc8448220E1', 0); // 20 wei

        const txReceipt = await tx.wait();

    } catch (e) {
        console.log("error:", e);
    }
};

main();

Example in React Project

Here's an example of how to use the ZKpay sdk with ethers v5 lib:

using Ethers v6:

    import { ZKpay } from "zkpay";
    import { ethers } from 'ethers';

    const provider = new ethers.BrowserProvider(window.ethereum, { name: 'sepolia', chainId: 11155111 });

    const zkpay = new ZKpay(provider, 11155111);

    await zkpay.buyWithNative(33, '0x3077Bf667dBD81d3c718684Da4DE4Dc8448220E1', 0)

ZKpay sdk also export ethers v6 instance:

import { ZKpay, SupportedChain ,ethers} from "zkpay";

const provider = new ethers.JsonRpcProvider("YOUR_RPC_URL");
const signer = provider.getSigner();

// Define the chain ID
const chainId: SupportedChain = 11155111;

// Instantiate the ZKpay class
const zkpay = new ZKpay(signer, chainId);

// Use the ZKpay instance to interact with ZKpay contracts
async function main() {
    const tokenContract = await zkpay.getTokenContract("usdc");
    console.log("Token contract address:", tokenContract.address);

    const buyTx = await zkpay.buyWithNative(BigInt("1000000000000000000"), "0xRecipientAddress");
    console.log("buyWithNative transaction:", buyTx);
}

main().catch(console.error);

As a package file for the nodejs

1. Install all dependencies

yarn

2. Generate a node js package

yarn run build

Node js version of the files will be generated to lib

Methods

• getZKpayContract

async getZKpayContract(): Promise<ethers.Contract>

Returns an instance of the ZKpay contract.

• getTokenAddress

getTokenAddress(token: TokenName): string

Returns the address of a specified token.

token: The name of the token. Valid names are "usdc"

• getTokenListsWithMetadata

getTokenListsWithMetadata(): TokenMetadataType[]

Returns a list of tokens with their metadata.

• getTokenContract

async getTokenContract(token: TokenName): Promise<ethers.Contract>

Returns an instance of the specified token's contract.

token: The name of the token.

• buyWithNative

async buyWithNative(
    amountInWei: bigint,
    onBehalfOf: string
): Promise<any>

buy compute credit with native tokens (ETH) into the ZKpay contract.

amountInWei: The amount to deposit, in wei. onBehalfOf: The address on whose behalf the buy is made.

• approve

async approve(token: TokenName, amount: bigint): Promise<any>
Approves the ZKpay contract to spend a specified amount of a token.

token: The name of the token. amount: The amount to approve.

• revokeApprove

async revokeApprove(token: TokenName): Promise<any>
Revokes the approval for the ZKpay contract to spend a specified token.

token: The name of the token.

• allowance

async allowance(token: TokenName): Promise<any>
get the allowed amount for the ZKpay contract to spend on specified token.

token: The name of the token.

• buy

async buy(
    token: TokenName,
    amount: bigint,
    onBehalfOf: string
): Promise<any>

buy credit with ERC-20 tokens.

token: The name of the token. amount: The ERC20 amount. onBehalfOf: The address on whose behalf the buy is made.

Development

To contribute to the development of ZKpay, clone the repository and install the dependencies:

git clone https://github.com/spaceandtimelabs/zkt-sdk-js.git
cd zkpay
npm install

Contributing

We welcome contributions to zkt-sdk. Please open an issue or submit a pull request on GitHub.

License

ZKpay is released under the MIT License. See the LICENSE file for more details.