Privy Integration (AVAX)

1import { PrivyProvider } from '@privy-io/react-auth';
2import { avalancheFuji } from 'viem/chains';
3import { SmoothSendAvaxProvider } from '@smoothsend/sdk/avax';
4 
5export function RootProviders({ children }: { children: React.ReactNode }) {
6  return (
7    <PrivyProvider
8      appId={process.env.NEXT_PUBLIC_PRIVY_APP_ID!}
9      config={{
10        embeddedWallets: { ethereum: { createOnLogin: 'users-without-wallets' } },
11        defaultChain: avalancheFuji,
12        supportedChains: [avalancheFuji],
13      }}
14    >
15      <SmoothSendAvaxProvider
16        apiKey={process.env.NEXT_PUBLIC_SMOOTHSEND_API_KEY!} // pk_nogas_*
17        // network is optional; defaults to "testnet"
18        // network="mainnet" // uncomment for mainnet
19      >
20        {children}
21      </SmoothSendAvaxProvider>
22    </PrivyProvider>
23  );
24}

1import { usePublicClient } from 'wagmi';
2import { usePrivy, useSignMessage } from '@privy-io/react-auth';
3import { useSmoothSendPrivyWrite } from '@smoothsend/sdk/avax';
4 
5function PrivyGaslessButton() {
6  const publicClient = usePublicClient();
7  const { user } = usePrivy();
8  const { signMessage } = useSignMessage();
9 
10  const ownerAddress = user?.wallet?.address as `0x${string}` | undefined;
11 
12  // Every writeContract call below goes through SmoothSend sponsorship infra.
13  // mode is set per writeContract call (not in hook params).
14  const { writeContract, isPending } = useSmoothSendPrivyWrite({
15    publicClient,
16    ownerAddress: ownerAddress ?? '0x0000000000000000000000000000000000000000',
17    // optional override if provider-level network is not set:
18    // network: 'mainnet',
19    signMessage: async ({ message }) => (await signMessage({ message })).signature,
20  });
21 
22  return (
23    <button
24      disabled={isPending}
25      onClick={() =>
26        writeContract({
27          address: '0xYourContract',
28          abi: YOUR_ABI,
29          functionName: 'mint',
30          args: [1],
31          mode: 'developer-sponsored',
32        })
33      }
34    >
35      {isPending ? 'Sponsoring...' : 'Submit Gasless'}
36    </button>
37  );
38}

1await writeContract({
2  address: '0xYourContract',
3  abi: YOUR_ABI,
4  functionName: 'mint',
5  args: [1],
6  mode: 'user-pays-erc20', // put mode here (per transaction)
7  paymaster: {
8    token: '0xYourErc20Token',
9    receiver: '0xYourTreasuryAddress',
10  },
11});