asset-conversion

A swap pallet

This pallet allows assets to be converted from one type to another by means of a constant product formula. The pallet based is based on Uniswap V2 logic.

Overview

This pallet allows you to:

• create a liquidity pool for 2 assets
• provide the liquidity and receive back an LP token
• exchange the LP token back to assets
• swap 2 assets if there is a pool created
• query for an exchange price via a new runtime call endpoint
• query the size of a liquidity pool.

Please see the rust module documentation for full details:

cargo doc -p pallet-asset-conversion --open

License

License: Apache-2.0

lib.rs:

Substrate Asset Conversion pallet

Substrate Asset Conversion pallet based on the Uniswap V2 logic.

Overview

This pallet allows you to:

• create a liquidity pool for 2 assets
• provide the liquidity and receive back an LP token
• exchange the LP token back to assets
• swap a specific amount of assets for another if there is a pool created, or
• swap some assets for a specific amount of another.
• query for an exchange price via a runtime call endpoint
• query the size of a liquidity pool via a runtime api endpoint.

The quote_price_exact_tokens_for_tokens and quote_price_tokens_for_exact_tokens functions both take a path parameter of the route to take. If you want to swap from native asset to non-native asset 1, you would pass in a path of [DOT, 1] or [1, DOT]. If you want to swap from non-native asset 1 to non-native asset 2, you would pass in a path of [1, DOT, 2].

(For an example of configuring this pallet to use Location as an asset id, see the cumulus repo).

Here is an example state_call that asks for a quote of a pool of native versus asset 1:

curl -sS -H "Content-Type: application/json" -d \
'{"id":1, "jsonrpc":"2.0", "method": "state_call", "params": ["AssetConversionApi_quote_price_tokens_for_exact_tokens", "0x0101000000000000000000000011000000000000000000"]}' \
http://localhost:9933/

(This can be run against the kitchen sync node in the node folder of this repo.)