gno.land/r/moul/x/across/v0

One address, read across fifteen realms that were already on chain.

Open /r/moul/x/across/v0:<address> and the page answers with everything fifteen other realms will say about that address: token balances, an LP position, stake and unclaimed rewards, a check-in streak, dice rolled, a rate-limit bucket, a lottery entry, a reaction. Rows that came back empty are counted and hidden.

What it is demonstrating

Not one of the fifteen source realms was changed. None of them knows this realm exists, none of them registered anywhere, and there is no shared interface, no base package, no version handshake. The only thing every source had to do was not declare private = true in its gnomod.toml, which is what lets another realm import it at all.

That is the composability claim in its weakest, most testable form: a realm's exported reads are a permanent public API, because the path it lives at can never be replaced. What you compile against today is what is on chain forever.

What it cost

Eight of the sources hold a per-address balance. They agree on nothing:

realm	signature
r/moul/x/daily/erc20/v0, …/vestoken/v0, …/wrapped/v0	BalanceOf(address) uint64
r/moul/x/pairs/aaa/v0, …/bbb/v0	BalanceOf(address) int64
r/moul/x/grc20faucet/v0	BalanceOf(symbol string, owner address) int64
r/moul/demo/wikicoin/v0	BalanceOf(address) uint
r/moul/x/daily/dice/v0	RollsOf(addr string) []int

Three integer widths, two signednesses, one that wants a symbol before the address, one that wants the address as a string. Composition still works, it just costs one hand-written adapter line per source. Report is those lines and nothing else, which is also why this realm ships no p/ library: extract one and both halves are empty.

The two sources that could not be read

• r/moul/x/amm/v0 exports SharesOf(keyA, keyB string, owner address), which routes through a helper that panics on an unknown pool. A getter that panics is not composable: one panicking source takes down a page assembled from fifteen, and recover() does not catch a cross-realm abort. Only its PoolCount() is called from here.
• r/moul/demo/vault/v0 exports MyBalance() with no address parameter, so it answers for its caller, which from here is this realm.

Neither is a bug. Both are what a getter looks like before anyone has tried to call it from another realm.

Private by default, and why this one is too

private = true, the repo default, because nothing needs to import this realm. The flag is a one-way door decided before the first publish, and it is the single thing that determines whether a realm can ever appear in a page like this one.

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Part of moul/gno-contracts — moul's versioned gno.land contracts. See the repository for the full catalog, build/test tooling, and usage.

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🧪 Highly experimental — potentially vibe-coded. Not audited; may break, change, or be removed at any time. Do not use with anything of value. Full disclaimer: DISCLAIMER.