Sample Test Instances

In this section, we provide sample instances following the json format described in the previous sections, along with the optimal solution, again in the appropriate json format. These can be used for testing purposes while developing a solver. We clarify that the solutions provided are optimal up to a very small factor (caused by rounding very small amounts). - Single order Instances - Multiple-orders on single token pairs Instances - Multiple orders on multiple token pairs Instances - Example Instance with solution containing calldata In general, the instance json's of all recent auctions can be found in the following links: - [prod] https://solver-instances.s3.eu-central-1.amazonaws.com/prod-mainnet/$AUCTION_ID.json - [barn] https://solver-instances.s3.eu-central-1.amazonaws.com/staging-mainnet/$AUCTION_ID.json In the above urls, one needs to replace the $AUCTION_ID with an actual auction_id. As a clarifcation, each auction taking place has a unique identifier that determines it. The easiest way to recover the id of an auction that resulted in a settlement taking place onchain is to start from the tx hash of the settlement, and use the competition endpoint to recover this id. Here is one such example. Here is a tx hash of a settlement that was executed onchain. 0x17271e39305217d36635afbcc882e9431f9195d561d814aba96986cdd12dd240 Starting from this hash, we can use the competition endpoint: https://api.cow.fi/mainnet/api/v1/solver_competition/by_tx_hash/0x17271e39305217d36635afbcc882e9431f9195d561d814aba96986cdd12dd240 and then we can see that the auction id was 6462225. Note also that the competition endpoint reveals the calldata of all submitted solutions that successfully simulated and got ranked. Using this id, we can now recover the instance.json of that auction: https://solver-instances.s3.eu-central-1.amazonaws.com/prod-mainnet/6462225.json