Recover Monero deposits beyond a terminal's subaddress gap
An offline merchant device may allocate hundreds of subaddresses before any of them receive payment. A restored wallet needs to search far enough beyond previously used indexes.
Size the lookahead from allocation records
On a recovery copy, inspect the highest issued major and minor indexes and the gaps after the last known payment. This example sets a two-account lookahead and a 500-address lookahead. Supply a password through your normal protected client if required. POST this example to /json_rpc on monero-wallet-rpc.
{
"jsonrpc": "2.0",
"id": "guide",
"method": "set_subaddress_lookahead",
"params": {
"major_idx": 2,
"minor_idx": 500
}
}
Retest a known late address
Run the necessary historical scan from before the earliest candidate payment and compare its results with a known late-index receipt. The setting changes derivation coverage. An empty RPC result does not mean old blocks have already been re-examined. Larger lookaheads increase work during recovery.