When interacting with the blockchain, you will have to select a network.

Selecting a Network

Commonly, you will use the --network option to configure your network during Ape commands. The following is a list of common Ape commands that can use the --network option:

ape test --network ethereum:local:foundry
ape console --network arbitrum:testnet:alchemy

You can also use the --network option on scripts that use the main() method approach or scripts that implement that NetworkBoundCommand command type. See the scripting guide to learn more about scripts and how to add the network option.

NOTE: You can omit values to use defaults. For example, the default ecosystem is ethereum and the default network is local, so you can do:

ape run --network ::foundry

as a short-cut for ethereum:local:foundry.

Configuring Networks

Change network defaults using your project’s ape-config.yaml file. The following configuration changes the default ecosystem, network, and provider such that if you omitted the --network option on network-bound commands, it would use the value <ecosystem-name>:<network-name>:<provider-name>.

default_ecosystem: <ecosystem-name>

  default_network: <network-name>
    default_provider: <provider-name>

You may also configure a specific gas limit for a given network:

  default_network: <network-name>
    gas_limit: "max"

You may use one of:

  • "auto" - gas limit is estimated for each transaction

  • "max" - the maximum block gas limit is used

  • A number or numeric string, base 10 or 16 (e.g. 1234, "1234", 0x1234, "0x1234")

For the local network configuration, the default is "max". Otherwise it is "auto".

Local Network

The default network in Ape is the local network (keyword "local"). It is meant for running tests and debugging contracts. Out-of-the-box, Ape ships with two development providers you can use for the local network:

ape test --network ::test
ape test --network ::geth  # Launch a local development geth process

To learn more about testing in ape, follow this guide.

Live Networks

Use the core plugin ape-geth to connect to local or remote nodes via URI. The geth plugin is abstract in that it represents any node, not just geth nodes. However, it will work best when connected to a geth node. To configure network URIs in geth, you can use the ape-config.yaml file:


Ad-hoc Network Connection

If you would like to connect to a URI using the geth provider, you can specify a URI for the provider name in the --network option:

ape run script --network ethereum:mainnet:

Additionally, if you want to connect to an unknown ecosystem or network, you can use the URI by itself. However, this is not recommended.

ape run script --network

WARNING: The recommended approach is to find or build a plugin to have more native support. Some reasons for this include:

  1. You may need to integrate with other plugins, such as explorer plugins for getting contract types.

  2. Some chains may not implement EIP-1559 or may have forked from a specific configuration.

  3. Response differences in uncommon blocks, such as the "pending" block or the genesis block.

  4. Revert messages and exception-handling differences.

  5. You are limited to using and EVM-based chains.

Running a Network Process

To run a network with a process, use the ape networks run command:

ape networks run

By default, ape networks run runs a development Geth process. To use a different network, such as hardhat or Anvil nodes, use the --network flag:

ape networks run --network ethereum:local:foundry

Provider Interaction

Once you are connected to a network, you now have access to a .provider. The provider class is what higher level Manager classes in Ape use to interface with the blockchain. You can call methods directly from the provider, like this:

from ape import chain

block = chain.provider.get_block("latest")