curl -X POST https://zap.dzap.io/v1/broadcast \
  -H "Content-Type: application/json" \
  -d '{
    "txId": "0xabc...",
    "chainId": 8453,
    "txData": "0x02f8b0..."
  }'

const result = await dzap.broadcastZapTx({
  txId: '0xabc...',
  chainId: 8453,
  txData: '0x02f8b0...', // signed raw transaction
});

if (result.status === 'success') {
  console.log('Broadcast tx hash:', result.txnHash);
} else {
  console.error('Broadcast failed:', result.message);
}

{
  "status": "success",
  "data": {
    "txnHash": "0xdef456...",
    "txnId": "0xabc..."
  }
}

{
  "status": "error",
  "data": {
    "message": "transaction underpriced"
  }
}