curl -X POST https://api.relayer.fi/v1/transactions/broadcast/raw \
  -H "Authorization: ApiKey $RELAYER_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "rawSignedTransaction": "0x...",
    "network": "base"
  }'

{
  "success": true,
  "message": "<string>",
  "statusCode": 123,
  "timestamp": "<string>",
  "data": {
    "txHash": "0x789...",
    "status": "broadcasted",
    "broadcastedAt": "2024-01-01T12:10:00Z"
  },
  "path": "<string>",
  "traceId": "<string>"
}