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fix(rpc/v05/simulate_transactions): fix error code for reverted transactions

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December 8, 2023 15:38
November 20, 2023 09:28

Welcome to Pathfinder

A Starknet full node giving you a safe view into Starknet.

Pathfinder is currently in alpha so expect some rough edges but it is already usable today!


  • access the full Starknet state history
    • includes contract code and storage, and transactions
  • verifies state using Ethereum
    • calculates the Starknet state's Patricia-Merkle Trie root on a block-by-block basis and confirms it against L1
    • this means the contract code and storage are now locally verified
  • implements the Starknet JSON-RPC API
    • Starknet APIs like starknet.js or full support using our JSON-RPC API for interacting with Starknet
  • run Starknet functions without requiring a Starknet transaction
    • executed against the local state
  • do fee estimation for transactions


We appreciate any feedback, especially during this alpha period. This includes any documentation issues, feature requests and bugs that you may encounter.

For help or to submit bug reports or feature requests, please open an issue or alternatively visit the Starknet discord channel.

Database compatibility

pathfinder 0.9.0 contains a change in our Merkle tree storage implementation that makes it impossible to use database files produced by earlier versions.

This means that upgrading to 0.9.0 will require either a full re-sync or downloading a database snapshot.

Running with Docker

The pathfinder node can be run in the provided Docker image. Using the Docker image is the easiest way to start pathfinder. If for any reason you're interested in how to set up all the dependencies yourself please check the Installation from source guide.

The following assumes you have Docker installed and ready to go. (In case of Ubuntu installing docker is as easy as running sudo snap install docker.)

The example below uses $HOME/pathfinder as the data directory where persistent files used by pathfinder will be stored. It is easiest to create the volume directory as the user who is running the docker command. If the directory gets created by docker upon startup, it might be unusable for creating files.

The following commands start the node in the background, also making sure that it starts automatically after reboot:

# Ensure the directory has been created before invoking docker
mkdir -p $HOME/pathfinder
# Start the pathfinder container instance running in the background
sudo docker run \
  --name pathfinder \
  --restart unless-stopped \
  --detach \
  -p 9545:9545 \
  --user "$(id -u):$(id -g)" \
  -e RUST_LOG=info \
  -e PATHFINDER_ETHEREUM_API_URL="<project-id>" \
  -v $HOME/pathfinder:/usr/share/pathfinder/data \

To check logs you can use:

sudo docker logs -f pathfinder

The node can be stopped using

sudo docker stop pathfinder

Updating the Docker image

When pathfinder detects there has been a new release, it will log a message similar to:

WARN New pathfinder release available! Please consider updating your node! release=0.4.5

You can try pulling the latest docker image to update it:

sudo docker pull eqlabs/pathfinder

After pulling the updated image you should stop and remove the pathfinder container then re-create it with the exact same command that was used above to start the node:

# This stops the running instance
sudo docker stop pathfinder
# This removes the current instance (using the old version of pathfinder)
sudo docker rm pathfinder
# This command re-creates the container instance with the latest version
sudo docker run \
  --name pathfinder \
  --restart unless-stopped \
  --detach \
  -p 9545:9545 \
  --user "$(id -u):$(id -g)" \
  -e RUST_LOG=info \
  -e PATHFINDER_ETHEREUM_API_URL="<project-id>" \
  -v $HOME/pathfinder:/usr/share/pathfinder/data \

Available images

Our images are updated on every pathfinder release. This means that the :latest docker image does not track our main branch here, but instead matches the latest pathfinder release.

Docker compose

You can also use docker-compose if you prefer that to just using Docker.

Create the folder pathfinder where your docker-compose.yaml is

mkdir -p pathfinder

# replace the value by of PATHFINDER_ETHEREUM_API_URL by the HTTP(s) URL pointing to your Ethereum node's endpoint
cp example.pathfinder-var.env pathfinder-var.env

docker-compose up -d

To check if it's running well use docker-compose logs -f.

Database Snapshots

Re-syncing the whole history for either the mainnet or testnet networks might take a long time. To speed up the process you can use database snapshot files that contain the full state and history of the network up to a specific block.

The database files are hosted on Cloudflare R2. There are two ways to download the files:

  • Using the Rclone tool
  • Via the HTTPS URL: we've found this to be less reliable in general

Rclone setup

We recommend using RClone. Add the following to your RClone configuration file ($HOME/.config/rclone/rclone.conf):

type = s3
provider = Cloudflare
env_auth = false
access_key_id = 7635ce5752c94f802d97a28186e0c96d
secret_access_key = 529f8db483aae4df4e2a781b9db0c8a3a7c75c82ff70787ba2620310791c7821
endpoint =
acl = private

You can then download a compressed database using the command:

rclone copy -P pathfinder-snapshots:pathfinder-snapshots/testnet_0.9.0_880310.sqlite.zst .

Uncompressing database snapshots

To avoid issues please check that the SHA2-256 checksum of the compressed file you've downloaded matches the value we've published.

We're storing database snapshots as SQLite database files compressed with zstd. You can uncompress the files you've downloaded using the following command:

zstd -T0 -d testnet_0.9.0_880310.sqlite.zst -o goerli.sqlite

This produces uncompressed database file goerli.sqlite that can then be used by pathfinder.

Available database snapshots

Network Block Pathfinder version required Filename Download URL Compressed size SHA2-256 checksum of compressed file
testnet 880310 >= 0.9.0 testnet_0.9.0_880310.sqlite.zst Download 102.36 GB 55f7e30e4cc3ba3fb0cd610487e5eb4a69428af1aacc340ba60cf1018b58b51c
mainnet 309113 >= 0.9.0 mainnet_0.9.0_309113.sqlite.zst Download 279.85 GB 0430900a18cd6ae26465280bbe922ed5d37cfcc305babfc164e21d927b4644ce
integration 315152 >= 0.9.1 integration_0.9.1_315152.sqlite.zst Download 8.45 GB 2ad5ab46163624bd6d9aaa0dff3cdd5c7406e69ace78f1585f9d8f011b8b9526


The pathfinder node options can be configured via the command line as well as environment variables.

The command line options are passed in after the docker run options, as follows:

sudo docker run --name pathfinder [...] eqlabs/pathfinder:latest <pathfinder options>

Using --help will display the pathfinder options, including their environment variable names:

sudo docker run --rm eqlabs/pathfinder:latest --help

Pending Support

Block times on mainnet can be prohibitively long for certain applications. As a workaround, Starknet added the concept of a pending block which is the block currently under construction. This is supported by pathfinder, and usage is documented in the JSON-RPC API with various methods accepting "block_id"="pending".


Logging can be configured using the RUST_LOG environment variable. We recommend setting it when you start the container:

sudo docker run --name pathfinder [...] -e RUST_LOG=<log level> eqlabs/pathfinder:latest

The following log levels are supported, from most to least verbose:

info  # default

Network Selection

The Starknet network can be selected with the --network configuration option.

If --network is not specified, network selection will default to match your Ethereum endpoint:

  • Starknet mainnet for Ethereum mainnet,
  • Starknet testnet for Ethereum Goerli

Custom networks & gateway proxies

You can specify a custom network with --network custom and specifying the --gateway-url, feeder-gateway-url and chain-id options. Note that chain-id should be specified as text e.g. SN_GOERLI.

This can be used to interact with a custom Starknet gateway, or to use a gateway proxy.


You can interact with Starknet using the JSON-RPC API. Pathfinder supports the official Starknet RPC API and in addition supplements this with its own pathfinder specific extensions such as pathfinder_getProof.

Currently pathfinder supports v0.3, v0.4, and v0.5 versions of the Starknet JSON-RPC specification. The path of the URL used to access the JSON-RPC server determines which version of the API is served:

  • the v0.3.0 API is exposed on the /rpc/v0.3 and /rpc/v0_3 path
  • the v0.4.0 API is exposed on the /, /rpc/v0.4 and /rpc/v0_4 path
  • the v0.5.1 API is exposed on the /rpc/v0.5 and /rpc/v0_5 path
  • the pathfinder extension API is exposed on /rpc/pathfinder/v0.1

Note that the pathfinder extension is versioned separately from the Starknet specification itself.

pathfinder extension API

Here are links to our API extensions and websocket API.

Monitoring API

Pathfinder has a monitoring API which can be enabled with the --monitor-address configuration option.


/health provides a method to check the health status of your pathfinder node, and is commonly useful in Kubernetes docker setups. It returns a 200 OK status if the node is healthy.


pathfinder does several things before it is ready to respond to RPC queries. In most cases this startup time is less than a second, however there are certain scenarios where this can be considerably longer. For example, applying an expensive database migration after an upgrade could take several minutes (or even longer) on testnet. Or perhaps our startup network checks fail many times due to connection issues.

/ready provides a way of checking whether the node's JSON-RPC API is ready to be queried. It returns a 503 Service Unavailable status until all startup tasks complete, and then 200 OK from then on.


/metrics provides a Prometheus metrics scrape endpoint. Currently the following metrics are available:

RPC related counters

  • rpc_method_calls_total,
  • rpc_method_calls_failed_total,

You must use the label key method to retrieve a counter for a particular RPC method, for example:


You may also use the label key version to specify a particular version of the RPC API, for example:

rpc_method_calls_total{method="starknet_getEvents", version="v0.3"}

Feeder Gateway and Gateway related counters

  • gateway_requests_total
  • gateway_requests_failed_total


  • method, to retrieve a counter for a particular sequencer request type
  • tag
    • works with: get_block, get_state_update
    • valid values:
      • pending
      • latest
  • reason
    • works with: gateway_requests_failed_total
    • valid values:
      • decode
      • starknet
      • rate_limiting

Valid examples:

gateway_requests_total{method="get_block", tag="latest"}
gateway_requests_failed_total{method="get_state_update", tag="pending"}
gateway_requests_failed_total{method="get_state_update", tag="pending", reason="starknet"}
gateway_requests_failed_total{method="get_state_update", reason="rate_limiting"}

These will not work:

  • gateway_requests_total{method="get_transaction", tag="latest"}, tag is not supported for that method
  • gateway_requests_total{method="get_transaction", reason="decode"}, reason is only supported for failures.

Sync related metrics

  • current_block currently sync'd block height of the node
  • highest_block height of the block chain
  • block_time timestamp difference between the current block and its parent
  • block_latency delay between current block being published and sync'd locally
  • block_download time taken to download current block's data excluding classes
  • block_processing time taken to process and store the current block

Build info metrics

  • pathfinder_build_info reports current version as a version property

Build from source

See the guide.


Licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.