CURL

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

curl http://lon.block0.wtf/ \
  -X POST \
  -H "Content-Type: application/json" \
  -d '{
    "base64_tx": "<BASE64_ENCODED_TRANSACTION>"
  }'

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