prioritisetransaction - Zcash 4.0.0 RPC

prioritisetransaction <txid> <priority delta> <fee delta>
Accepts the transaction into mined blocks at a higher (or lower) priority

1. "txid"       (string, required) The transaction id.
2. priority delta (numeric, required) The priority to add or subtract.
                  The transaction selection algorithm considers the tx as it would have a higher priority.
                  (priority of a transaction is calculated: coinage * value_in_satoshis / txsize) 
3. fee delta      (numeric, required) The fee value (in satoshis) to add (or subtract, if negative).
                  The fee is not actually paid, only the algorithm for selecting transactions into a block
                  considers the transaction as it would have paid a higher (or lower) fee.

true              (boolean) Returns true

> zcash-cli prioritisetransaction "txid" 0.0 10000
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id":"curltest", "method": "prioritisetransaction", "params": ["txid", 0.0, 10000] }' -H 'content-type: text/plain;'

Made by @karel_3d; license of the docs is MIT (see zcash repo), license of the scripts and webpage is also MIT ((C) 2018 Karel Bilek) (github repo)

Note it uses a mainnet node