Package reaper is a noticeboard whose garbage is a standing bounty.
Anyone can post a note with an expiry. Posting locks a storage deposit, paid by the poster. Once a note expires, anyone at all can delete it, and the chain refunds that deposit to whoever signed the deleting transaction. So the poster pays to occupy space and a stranger is paid to reclaim it.
Nothing here is a token, a reward pool or an emission schedule. The incentive is the chain's own storage accounting, which already works this way for every realm on gno.land; this realm only makes it legible. Reap and Compact are permissionless because the expiry predicate is checked on chain, so the worst a malicious reaper can do is waste their own gas.
Two collaborators own the parts this realm does not:
The realm deliberately cannot see its own byte count. No stdlib call exposes a realm's locked storage, so every figure Render shows is an estimate from payload length. The authoritative numbers are the chain's, in the StorageDepositEvent and StorageUnlockEvent each transaction emits.
Bounty prices what is currently on the table for a reaper, at the default storage price and the floor gas price.
The byte figure is an estimate from payload length, never the chain's own accounting. Treat it as an advertisement, not a settlement.
gnokey query vm/qeval -remote "https://rpc.gno.land" -data "gno.land/r/moul/x/reaper/v1.Bounty()"Compact frees the tree nodes that reaping left behind and returns how many.
Also permissionless, and also paid the same way. It is a separate call because it is a separate economic decision, and a surprisingly large one: on chain, compacting a drained board returned about three times what deleting the notes themselves did, because a list node costs more than the note it carries. But it returns nothing at all while any live note sits below the dead ones, so the two calls are worth batching in that order: reap, then compact. Compactable says how much is actually there, for free.
# WARNING: This command is running in an INSECURE mode.
# It is strongly recommended to use a hardware device for signing
# and avoid trusting any computer connected to the internet,
# as your private keys could be exposed.
gnokey maketx call -pkgpath "gno.land/r/moul/x/reaper/v1" -func "Compact" -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -chainid "gnoland-1" -remote "https://rpc.gno.land" ADDRESSgnokey query -remote "https://rpc.gno.land" auth/accounts/ADDRESS
gnokey maketx call -pkgpath "gno.land/r/moul/x/reaper/v1" -func "Compact" -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -broadcast=false ADDRESS > call.tx
gnokey sign -tx-path call.tx -chainid "gnoland-1" -account-number ACCOUNTNUMBER -account-sequence SEQUENCENUMBER ADDRESS
gnokey broadcast -remote "https://rpc.gno.land" call.tx
Compactable reports how many dead tree nodes a Compact would free.
gnokey query vm/qeval -remote "https://rpc.gno.land" -data "gno.land/r/moul/x/reaper/v1.Compactable()"Live counts the notes still holding storage.
gnokey query vm/qeval -remote "https://rpc.gno.land" -data "gno.land/r/moul/x/reaper/v1.Live()"Post adds a note that becomes reapable ttl blocks from now, and locks the storage deposit for it against the caller.
A ttl of zero is allowed and makes the note reapable immediately, which is the cheapest way to demonstrate the mechanism.
# WARNING: This command is running in an INSECURE mode.
# It is strongly recommended to use a hardware device for signing
# and avoid trusting any computer connected to the internet,
# as your private keys could be exposed.
gnokey maketx call -pkgpath "gno.land/r/moul/x/reaper/v1" -func "Post" -args $'' -args $'' -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -chainid "gnoland-1" -remote "https://rpc.gno.land" ADDRESSgnokey query -remote "https://rpc.gno.land" auth/accounts/ADDRESS
gnokey maketx call -pkgpath "gno.land/r/moul/x/reaper/v1" -func "Post" -args $'' -args $'' -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -broadcast=false ADDRESS > call.tx
gnokey sign -tx-path call.tx -chainid "gnoland-1" -account-number ACCOUNTNUMBER -account-sequence SEQUENCENUMBER ADDRESS
gnokey broadcast -remote "https://rpc.gno.land" call.tx
Reap deletes up to limit expired notes and returns how many it deleted.
Permissionless by design. The storage deposit freed goes to whoever signed this transaction, so a stranger keeping the board tidy is paid for it out of the deposits the posters locked. A note that has not expired is skipped, not refused, so a reaper never has to guess which indices are ripe.
It walks from the highest index down, which is not cosmetic. In the backing list the oldest indices are the ancestors of the newest, so a node can only be freed once everything below it is dead. Reaping oldest-first with a binding limit therefore never creates a dead tail and leaves Compactable at zero, stranding the tree structure, which measures at roughly two thirds of what an entry costs. Reaping newest-first makes each batch immediately compactable. Every candidate is expired either way, so the order changes only who gets paid how much, and it is measured: see the ulist package doc.
# WARNING: This command is running in an INSECURE mode.
# It is strongly recommended to use a hardware device for signing
# and avoid trusting any computer connected to the internet,
# as your private keys could be exposed.
gnokey maketx call -pkgpath "gno.land/r/moul/x/reaper/v1" -func "Reap" -args $'' -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -chainid "gnoland-1" -remote "https://rpc.gno.land" ADDRESSgnokey query -remote "https://rpc.gno.land" auth/accounts/ADDRESS
gnokey maketx call -pkgpath "gno.land/r/moul/x/reaper/v1" -func "Reap" -args $'' -gas-fee 1000000ugnot -gas-wanted 1_000_000_000 -send "" -broadcast=false ADDRESS > call.tx
gnokey sign -tx-path call.tx -chainid "gnoland-1" -account-number ACCOUNTNUMBER -account-sequence SEQUENCENUMBER ADDRESS
gnokey broadcast -remote "https://rpc.gno.land" call.tx
Reapable counts the notes that have expired and not yet been reaped.
gnokey query vm/qeval -remote "https://rpc.gno.land" -data "gno.land/r/moul/x/reaper/v1.Reapable()"gnokey query vm/qeval -remote "https://rpc.gno.land" -data "gno.land/r/moul/x/reaper/v1.Render()"