Reconcile With Memos - Base Documentation

Tie onchain activity back to your books. A memo attaches a bytes32 reference to an operation and emits a Memo event alongside it, so reconciliation is a log query instead of a deposit address per customer. Every core call has a memo variant: mintWithMemo, burnWithMemo, transferWithMemo, and transferFromWithMemo.

Demo

Tag an operation

Terminal

# Attach a reference, emitted as a Memo event right after the Transfer.
MEMO=$(base-cast format-bytes32-string "invoice-8842")
base-cast send $TOKEN_ADDRESS "transferWithMemo(address,uint256,bytes32)" \
  $MERCHANT 25000000 $MEMO --rpc-url $RPC_URL --private-key $PAYER_KEY

Indexers join each Memo to its operation by (transactionHash, logIndex − 1).

See also

Accept B20 payments for the full app-side flow
Query B20 events with the CDP SQL API to reconcile at scale