Notes:

Oracle external ICP/USD ETH/USD BTC/USD, market caps, and volume are pushed from outside. These values stay in their tracks and are not used unless XRC fetching the same stops working for more than 4 hours. They are refreshed every 5 seconds and someone can use them if they want faster updates. XRC prices are updated once per minute.

Sonic volume not included - no on-chain API for it. Sonic also doesn’t seem to record its pool prices and provide API for it, on or off-chain. There is only the current price available.

ICDex reports volume in tokens and not USD, which changes price. Then it becomes hard to tell what is the actual volume. When keeping track of volume by adding the transaction value not in tokens but in a stable currency like USD - it is more accurate. Example: Trades happen all day at a price of 2.3 (for a total of 30k USD) and at the end of the day the price goes to 4.6 (10k USD). If you convert volume 24 with the current token price, you will get a total volume (70k USD) - almost double what it really is. It will also be halved if the price goes down. Our API can record the total volume and use that to fix the issue, but it’s still good to have volume in USD.

ICPSwap We are currently ****using TVL to determine liquidity (depth -50%). The other way of doing it is complicated and may not even be possible without implementing a good portion of their dex algorithm. Some tokens aren’t tagged to count towards TVL, probably to discourage users from trying to cheat the reward system by filling it with custom coins without value. However, XTC and Ghost don’t count towards it too at the time of writing. Making the stat we are providing not very accurate. We have contacted them and asked for a multi_quote function, which could be used to amend that.

Conclusion: We will need to create a standard for fetching information from DEXes that will work for both order book and AMM DEXes and also for both single and multiple tokens inside one canister. This will ensure the stability of systems relying on such information. The functions we currently use are most likely made to serve the developer’s web apps. We will also need another standard for getting locked & unlocking(optional) tokens from non-SNS contracts.

Run inside dev container using VSCode for safer verification OR install these before you run the command.

npm i -g [email protected]
npm i -g [email protected]

./verify.sh