Gasfree integration

import { PaymasterRpc } from 'starknet';

// Initialize paymaster with your API key
const paymaster = new PaymasterRpc({
  nodeUrl: 'https://starknet.paymaster.avnu.fi', // or sepolia.paymaster.avnu.fi for testing
  headers: { 'x-paymaster-api-key': process.env.AVNU_API_KEY },
});

// Execute any transaction - gas is paid from your credits
const result = await account.execute(calls, {
  paymaster: {
    provider: paymaster,
    params: {
      version: '0x1',
      feeMode: { mode: 'sponsored' } // You sponsor, user pays nothing
    }
  }
});

// app/api/paymaster/route.ts
export async function POST(request: Request) {
  const body = await request.json();

  const response = await fetch('https://starknet.paymaster.avnu.fi', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'x-paymaster-api-key': process.env.AVNU_API_KEY!,
    },
    body: JSON.stringify(body),
  });

  return Response.json(await response.json());
}

const response = await fetch(
  'https://starknet.api.avnu.fi/paymaster/v1/sponsor-activity?startDate=2025-01-01&endDate=2025-01-31',
  { headers: { 'api-key': process.env.AVNU_API_KEY } }
);

const stats = await response.json();
// { txCount, succeededTxCount, strkGasFees, remainingStrkCredits, ... }