Locally testing a solver with the CoW Protocol orderflow

In order to test a solver against CoW Protocol’s orderflow, one needs to locally run the following components

autopilot, which will be configured to point, for example, to the production orderbook and to send the auctions to a local driver.
driver, which will receive auctions from the autopilot and forward them to the solver engine
the solver engine that is meant to be tested, run as a local http server able to receive /solve requests from the driver and respond to them.

It is assumed you have rust setup correctly with rustup.

The repository where all the backend services can be found is this one: https://github.com/cowprotocol/services. Here are the main instructions to run the autopilot and the driver. For the autopilot, we run

    cargo run --bin autopilot -- --native-price-estimators "Driver|baseline|http://driver/baseline" --skip-event-sync true --node-url $NODE_URL --shadow https://barn.api.cow.fi/mainnet --drivers "mysolver1|http://localhost:11088|0x0000000000000000000000000000000000000000|0"

where one needs to set the NODE_URL appropriately (e.g., a free Infura endpoint).

CoW Protocol services infrastructure can be very heavy on RPC resource consumption. Be careful if using with post-paid plans, it’s recommended to keep a close eye on RPC resource consumption.

For the driver, we run

    cargo run -p driver -- --config driver.config.toml --ethrpc $NODE_URL

where one needs to configure driver.config.toml to point to their solver engine. A sample such file can be found here. Once the above are set up and running, one can then start testing their solver engine against one of the following orderbooks:

Orderbook URL	Network	Environment
https://barn.api.cow.fi/mainnet/api	Mainnet	Staging
https://api.cow.fi/mainnet/api	Mainnet	Production
https://barn.api.cow.fi/xdai/api	Gnosis Chain	Staging
https://api.cow.fi/xdai/api	Gnosis Chain	Production
https://barn.api.cow.fi/arbitrum_one/api	Arbitrum One	Staging
https://api.cow.fi/arbitrum_one/api	Arbitrum One	Production
https://barn.api.cow.fi/base/api	Base	Staging
https://api.cow.fi/base/api	Base	Production
https://barn.api.cow.fi/avalanche/api	Avalanche	Staging
https://api.cow.fi/avalanche/api	Avalanche	Production
https://barn.api.cow.fi/polygon/api	Polygon	Staging
https://api.cow.fi/polygon/api	Polygon	Production
https://barn.api.cow.fi/bnb/api	BNB	Staging
https://api.cow.fi/bnb/api	BNB	Production
https://barn.api.cow.fi/linea/api	Linea	Staging
https://api.cow.fi/linea/api	Linea	Production
https://barn.api.cow.fi/plasma/api	Plasma	Staging
https://api.cow.fi/plasma/api	Plasma	Production
https://barn.api.cow.fi/ink/api	Ink	Staging
https://api.cow.fi/ink/api	Ink	Production
https://barn.api.cow.fi/sepolia/api	Sepolia	Staging
https://api.cow.fi/sepolia/api	Sepolia	Production