What Is a ‘Whitelisting’ Policy for Zero-Fee Transactions?

A 'whitelisting' policy for zero-fee transactions is a custom rule set by a miner or mining pool to allow certain zero-fee transactions to be included in their blocks. This policy is typically reserved for their own internal transactions, such as payroll or fund consolidation, to ensure they are confirmed without a fee.

It is a deviation from the standard profit-maximizing algorithm, which would otherwise reject all zero-fee transactions. This policy ensures operational efficiency for the mining entity.

In Which Scenarios Is a Custom Binary Protocol Superior to Standard Protocols for RFQ?
What Is “Colocation” and How Does It Give HFT Firms an Advantage in Minimizing Their Own Slippage?
How Does Block Size Limit Affect the Confirmation Chances of a Zero-Fee Transaction?
Can a Zero-Fee Transaction Be a Part of a ‘Batch’ Transaction?
How Do CEXs Handle Price Feeds for Their Own Internal Derivatives Trading?
How Does the Mark-to-Market Rule Interact with the Wash Sale Rule?
Why Might a Miner Process Their Own Zero-Fee Transaction?
Why Do Miners Accept a New Block Even If They Haven’t Finished Their Own Work?

Glossar