Running the RPC adapter

Instructions on how to locally run the RPC adapter

Running the RPC adapter allows for interaction with the Acala EVM+, be it with the local development network, public test network or either of the main networks.

In previous local development setup section, we run the whole stack (node + subquery + rpc adapter) with docker compose, which already includes the RPC adapter. This sections is for those who want to run the RPC adapter separately, or learn more about the RPC adapter.

Running a local mandala node

RPC adapter needs to connect to a node, so we first run a local mandala node at port 9944

docker run -it --rm -p 9944:9944 -p 9933:9933 --dev --ws-external --rpc-port=9933 --rpc-external --rpc-cors=all --rpc-methods=unsafe -levm=debug --pruning=archive --instant-sealing

Running the RPC adapter

with docker

docker run -it --rm -p 8545:8545 acala/eth-rpc-adapter:2.8.1 --endpoint ws://host.docker.internal:9944 --local-mode

or via npm

npx @acala-network/eth-rpc-adapter \
  --endpoint ws://localhost:9944 \

Flags can be appended to the command in order to adapt the default configuration to your needs. Flags are documented at the bottom of this page.


Options can be passed to the RPC adapter in three ways:

  1. As CLI options (recommended)

  2. As environment variables

Passing the options as CLI options

Passing the options as CLI options is done by appending the values to the command when running the RPC adapter:

npx @acala-network/eth-rpc-adapter -l -e ws://localhost:9944

Passing the options as environment variables

If you wish to pass the options as environment variables in the terminal, you can add them with the export statements, or by prepending the command used to spin up RPC adapter:

export ENDPOINT_URL=ws://localhost:9944
LOCAL_MODE=1 npx @acala-network/eth-rpc-adapter

Both the environment variable that is defined by itself as well as the one defined inline with the yarn start will be used in this case.

List of options

Please don't mix using ENVs and CLI options. CLI options are preferred, and will overwrite ENVs.

More details can also be found by npx @acala-network/eth-rpc-adapter --help.

ENVcli options equivalentdefaultexplanation


-e, --endpoint


Node websocket endpoint(s): can provide one or more endpoints, seperated by comma url




Subquery url: optional if testing contracts locally that doesn't query logs or historical Tx, otherwise required


-p, --port


port to listen for http and ws requests




max number of blocks that lives in the cache more info




max batch size for RPC request




max storage cache size


-s, --safe-mode


if enabled, TX and logs can only be found after they are finalized


-l, --local-mode


enable this mode when testing with locally running instant-sealing mandala




only allow http requests, disable ws connections


-v, --verbose


print some extra info

Using the -e flag and passing the URL of a Mandala, Acala and Karura node allows for running the local RPC adapter while communicating with a public network.


local mode

For local testing, we usually turn this mode on, together with a local --instant-sealing mandala node. It has some optimization to run faster with local node, and some minor bug prevention.

safe mode (deprecated)

In this mode, Txs and logs can only be found after they are finalized. Now deprecated in favor for the finalized and safe block tags.

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