open-sourced another building block on the path to cross-chain swaps:

a reference implementation of a minimalistic server-based allocator for The Compact

it's called Smallocator 🤏

https://github.com/Uniswap/smallocator

if you're wondering "what the hell is an allocator" then read on

↓

so the way that The Compact works is that you deposit into resource locks

when you do, you choose an allocator for that lock

then when you create a compact (e.g. a request to take some action) they make sure you're not double-spending & "attest" that the compact's good to go

another approach is to run it in a server like Smallocator

granted, fillers and solvers are counting on the server not to let users double-spend

but it's fast & basically free

it also delays revealing info about the cross-chain swap or other action to help avoid getting 🥪'd

this codebase is meant to serve as a reference if you want to learn more about allocators

you can click around on the frontend (link on the readme) as well as with the API (the "main course")

it's also a good starting point if you're looking into running an allocator yourself!

Smallocator features:

🔐 Secure session-based authentication using EIP-4361
✍️ EIP-712 Compact message validation & signing on demand from session-gated accounts
🤫 No witness data or signature provided, sponsor intents stay secret (only typestring & witness hash is supplied)

📊 GraphQL integration with The Compact Indexer for multi-chain indexing
💾 Persistent storage using PGLite to track attested compacts and used nonces
🔎 Comprehensive validation pipeline to ensure resource locks never end up in an overallocated state

one final caveat here: this is really not meant for production use at all

if you're working on chain abstraction & curious about how The Compact works i highly encourage you to give Smallocator a whirl

much more to come; this is just another small step

🤏

arguably the most straightforward allocator would be a purely onchain contract

to fill a cross-chain swap, you'd call this contract, it'd check your balance and your pending compacts, and reserve the tokens for you for a little while

but this is slow, pricey, and not private