Typescript

For successful transaction processing, please include a system transfer tip to one of our designated tip addresses

interface RequestPayload {
  base64_tx: string;
}

interface TransactionResult {
  response?: string;
  error?: string;
  status: 'success' | 'error';
}

function submitSolanaTransaction(base64Transaction: string): Promise<TransactionResult> {
  const url = "http://lon.block0.wtf/";
  const payload: RequestPayload = {
    base64_tx: base64Transaction
  };

  return fetch(url, {
    method: "POST",
    headers: {
      "Content-Type": "application/json"
    },
    body: JSON.stringify(payload)
  })
  .then(async response => {
    const data = await response.text();
    return {
      response: data,
      status: 'success' as const
    };
  })
  .catch(error => {
    return {
      error: error instanceof Error ? error.message : String(error),
      status: 'error' as const
    };
  });
}

If you're sending with blockhash in your TX, please ensure to use commitment level finalized.