8021 Attribution Checker

Verify if a Base transaction is 8021 attributed

Transaction Type

Transaction Hash

Encode / Decode Attribution

Create or decode ERC-8021 attribution suffixes for your transactions.

Mode

Builder Codes (comma-separated)

Enter one or more builder codes separated by commas

Use Custom Registry (Schema 1)

A transaction is considered "8021 attributed" when the last 16 bytes (32 hex characters) of its input data match the pattern 8021 repeated 8 times.

80218021802180218021802180218021

This checker validates Base blockchain transactions against this pattern. Learn more about ERC-8021