Superposition contracts

Longtail

Longtail is Arbitrum's cheapest and most rewarding AMM.

Deployments

Superposition Testnet

AMM contract deployments

Deployment name	Deployment address
Longtail AMM	0xd706b85c571330af8495174664d04D6d8551F9D5
Longtail NFT manager	0x7AD12Ef3578D5eb845883d156D8dFB2eA39448B5
Permit2 router	0x2246431582087b930F2CE561c34deb8E7e5c44bE
Swaps implementation	0x7717e32db762818b86b47a213c1461c56ab2d4b6
Swaps permit2 A implementation	0x5992090411265add042b29dc361dee05e5606db6
Quotes implementation	0xf6120b79c5541806b1b4c619fbb8dcfdf32cfa20
Positions implementation	0x0721157b712f90085a006eb56f44e5b22b374501
Update position implementation	0x149c6ead35c4e60a090dad3dcb458f2b2e5f18a8
Admin implementation	0x09251054f9f91a26c51459d0af373fcd5d01d993
Adjust position implementation	0x6de9c5025c107057b63ffe15dcfe28604f27e4f1
Swaps permit2 B implementation	0x03af6a949f68e1ede06b63c8b43e6082689171cf

Leo contract deployments

Deployment name	Deployment address
Implementation	0xe8c1d28a4c16225c7188d0d812690a451e9c818a

Useful testing token deployments

Deployment name	Deployment address
fUSDC	0xA8EA92c819463EFbEdDFB670FEfC881A480f0115
WETH	0xde104342B32BCa03ec995f999181f7Cf1fFc04d7
USDC	0x6437fdc89cED41941b97A9f1f8992D88718C81c5
WSPN	0x22b9fa698b68bBA071B513959794E9a47d19214c
CATBUX	0x36c116a8851869cf8a99b3Bda0Fad42453D32B99

Errors

Currently, to save on space, errors generated by the contract are terse. Decode the hex to the appropriate error in this table:

No	Hex	Explanation
0	0x00	Denominator is 0
1	0x01	Result is U256::MAX
2	0x02	Sqrt price is 0
3	0x03	Sqrt price is less than or equal to quotient
4	0x04	Can not get most significant bit or least significant bit on zero value
5	0x05	Liquidity is 0
6	0x06	require((product = amount * sqrtPX96) / amount == sqrtPX96 && numerator1 > product);
7	0x07	Denominator is less than or equal to prod_1
8	0x08	Liquidity Sub
9	0x09	Liquidity Add
10	0x0a	The given tick must be less than, or equal to, the maximum tick
11	0x0b	Second inequality must be < because the price can never reach the price at the max tick
12	0x0c	Overflow when casting to U160
13	0x0d	Liquidity higher than max
14	0x0e	Fee growth sub overflow
15	0x0f	ERC20 call reverted
16	0x10	ERC20 call reverted with no data
17	0x11	Pool is already initialised
18	0x12	Contract is already initialised
19	0x13	Price limit too high
20	0x14	Price limit too low
21	0x15	Checked abs called on an unexpected positive number
22	0x16	Checked abs called on an unexpected negative number
23	0x17	Checked abs called on uint.min
24	0x18	Fee result too high
25	0x19	Swap result too high
26	0x1a	Internal swap amounts not matched
27	0x1b	Internal swap result was positive
28	0x1c	Minimum out not reached
29	0x1d	Only the position owner can use this
30	0x1e	Only the NFT manager can use this
31	0x1f	Only the Seawater admin can use this
32	0x20	Operation unavailable when the pool is disabled
33	0x21	Invalid tick spacing
34	0x22	Swap result too low
35	0x23	Liquidity too low or high to be a int128
36	0x24	Invalid tick
37	0x25	Pool enabled when it should be disabled for this action
38	0x26	Position is empty when it shouldn't be
39	0x27	Liquidity that was almost taken was too low when it didn't need to be
40	0x28	Fee growth that tried to be calculated was bad internally for a tick

If more bytes are in the error, then the issue was produced by the ERC20 token. Convert any error types to their selector form to see.

Access graph

A publicly available graph for Longtail is available. It includes documentation. https://testnet-graph.long.so.

Longtail ("Seawater") is a diamond-like contract, with the frontend to access the Stylus diamond facets implemented in Solidity. So, Stylus is needed with Rust for the implementation contracts, and Foundry is needed to compile the contract.

To save on contract size, and to reduce gas overhead, this contract stores the addresses of the swap router, and the admin address, at compile-time.

So these variables must set at compile-time, like so:

Build variables

Name	Description
`FLU_SEAWATER_PERMIT2_ADDR`	Uniswap Permit2 router
`FLU_SEAWATER_FUSDC_ADDR`	USDC Super Asset to route every trade through

Build dependencies

Name	Source
Rust (nightly version)	Installer
Cargo Stylus subcommand	Repo
Foundry	Installer
Make	`build-essentials` if you're on Linux

Build process

make build

Testing

Testing is done with via a hosted test using cargo features with the testing flag. tests.sh is provided to run both test suites.

End to end testing is currently unavailable due to issues with the deployment toolchain.

Testing process

./tests.sh

Cargo test tracing

Some of the cargo tests have optional logging, which might help with debugging. To see these logs, enable the testing-dbg-<test> feature and run the tests without capturing stdout, ie cargo test --features=testing,testing-dbg-erc20 -- --nocapture.

Testing tools are available with the with_storage macro, which lets you set slots and maximum balances for ERC20 transfers. Reproducing on-chain transactions is possible by using a tracer on the chain the transaciton took place, then examining the storage slots that were accessed (perhaps by looking at SLOADs), and setting it explicitly with the macro.

Deployment

You can deploy the contracts using the deploy.sh script.

Test deployments

Deployments on a local node can be done with ./test-deploy.sh for simplicity.

Deployment variables

Name	Description
`SEAWATER_PROXY_ADMIN`	Address that's permitted to administrate the code, including deploying updates, and creating pools.
`STYLUS_ENDPOINT`	URL to access the Stylus node.
`STYLUS_PRIVATE_KEY`	Private key to use for deployment.
`FLU_SEAWATER_FUSDC_ADDR`	Super USDC address to use as the base asset for each pool.

Leo

Leo (also known as the Seawater Rewards Manager) is a contract that allows users to vest their LP tokens in the form of a transferFrom using the NFTManager contract. Leo remembers who owns the LP NFTs it has, and does things like collect fees on the behalf of the owner, and knows to do so when determining "real yield" mixed with fees earned for LPing.

Longtail AMM contracts docs