PayGrid

PayGrid is a self-hosted, open source embeddable Web3 payments infrastructure built on Solana, designed with privacy at its core. It enables businesses to accept SOL and SPL token payments directly within their applications through encrypted payment flows and a privacy-focused architecture that keeps sensitive transaction data under the business’s control. With no third-party processors involved, PayGrid delivers secure payments, full data ownership, and built-in analytics in a single infrastructure layer.

with privacy powered by ShadowWire

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🚀 Features

• Self-Hosted: Full control over your data and treasury keys.
• Dual Payment Flows:
  • Wallet-Signing: Direct transaction signing with Solana wallets (Phantom, Solflare, etc.).
  • Manual Transfer: Unique temporary wallet generation for manual transfers.
• Embedded Dashboard: Built-in React components for managing payments and API keys.
• SQLite Powered: No heavy database setup required; data is stored locally in an embedded SQLite file.
• Status Monitoring: Background watcher automatically settles payments by monitoring the blockchain.

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🛠 Installation

npm install @qhristen/paygrid

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🏗 Setup

1. Environment Variables

Create a .env file in your Next.js project:

NEXT_PUBLIC_SOLANA_RPC_URL=https://api.mainnet-beta.solana.com
NEXT_PUBLIC_MERCHANT_WALLET_ADDRESS=
NEXT_PUBLIC_PAYGRID_API_SECRET=
DB_PATH=../test.db
NEXT_PUBLIC_NETWORK=mainnet-beta
NEXT_PUBLIC_ADMIN_EMAIL=admin-test@paygrid.com
NEXT_PUBLIC_ADMIN_PASSWORD=securepassword12345

2. Initialize PayGrid (API Route)

Create a file at app/api/paygrid/[...path]/route.ts:

import { initPayGrid } from "@qhristen/paygrid";
import { createApiHandler } from "@qhristen/paygrid/server";

// Initialize core
const paygrid = await initPayGrid();

// Create handler
const handler = createApiHandler(paygrid);

export { handler as GET, handler as POST };

3. Embed the Dashboard

Create a dashboard page at app/dashboard/payments/page.tsx:

"use client";

import { PayGridDashboard } from "@qhristen/paygrid";

export default function DashboardPage() {
  return (
    <div className="pg-dashboard-wrapper">
      <PayGridDashboard apiUrl="/api/paygrid" />
    </div>
  );
}

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💳 Usage

Create a Payment Intent

const response = await fetch("/api/paygrid/payment-intents", {
  method: "POST",
  headers: {
    "x-api-key": "your_api_key",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    amount: 1.5,
    tokenMint: "SOL",
    method: "wallet-signing", // or 'manual-transfer'
    metadata: { orderId: "12345" },
  }),
});

const intent = await response.json();
console.log("Payment Intent Created:", intent.id);

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🔐 Security

• Treasury Keys: Your treasury private key is only used to sign transactions for settlements (if applicable) and is never exposed via the API.
• API Keys: Keys are hashed using bcrypt before being stored in the database.
• Validation: Every transaction is validated against the blockchain state before being marked as settled.

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🧱 Architecture

• core/: Payment lifecycle and state machine logic.
• blockchain/: Solana Web3.js integration and watchers.
• db/: Embedded SQLite storage.
• api/: Next.js request handlers.
• dashboard/ & checkout/: React UI components.
• auth/: API key generation and validation.

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⚖️ License

MIT