# OpenZeppelin Relayer
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This relayer service enables interaction with blockchain networks through transaction submissions. It offers multi-chain support and an extensible architecture for adding new chains.
[User Docs](https://docs.openzeppelin.com/relayer/) | [Quickstart](https://docs.openzeppelin.com/relayer/quickstart)
## Features
- **Multi-Chain Support**: Interact with multiple blockchain networks, including Solana and EVM-based chains.
- **Transaction Relaying**: Submit transactions to supported blockchain networks efficiently.
- **Transaction Signing**: Securely sign transactions using configurable key management.
- **Transaction Fee Estimation**: Estimate transaction fees for better cost management.
- **Solana Gasless Transactions**: Support for gasless transactions on Solana, enabling users to interact without transaction fees.
- **Transaction Nonce Management**: Handle nonce management to ensure transaction order.
- **Transaction Status Monitoring**: Track the status of submitted transactions.
- **SDK Integration**: Easily interact with the relayer through our companion JavaScript/TypeScript SDK.
- **Extensible Architecture**: Easily add support for new blockchain networks.
- **Configurable Network Policies**: Define and enforce network-specific policies for transaction processing.
- **Metrics and Observability**: Monitor application performance using Prometheus and Grafana.
- **Docker Support**: Deploy the relayer using Docker for both development and production environments.
- **Relayer Plugins**: Extend the relayer functionality through TypeScript functions.
## Supported networks
- Solana
- EVM
- Stellar
> For details about current development status and upcoming features, check our [Project Roadmap](https://docs.openzeppelin.com/relayer/roadmap).
## For users
### Installation
View the [Installation](https://docs.openzeppelin.com/relayer#getting_started) documentation for detailed information. For a quicker introduction, check out the [Quickstart](https://docs.openzeppelin.com/relayer/quickstart) guide.
### Usage
View the [Usage](https://docs.openzeppelin.com/relayer#running_the_relayer) documentation for more information.
### Examples
The repository includes several ready-to-use examples to help you get started with different configurations:
| Example | Description |
| ------------------------------------------------------------------------------------ | -------------------------------------------------------- |
| [`basic-example`](./examples/basic-example/) | Simple setup with Redis |
| [`redis-storage`](./examples/redis-storage/) | Simple setup with Redis for storage |
| [`redis-tls`](./examples/redis-tls/) | Redis with TLS encrypted connections |
| [`basic-example-logging`](./examples/basic-example-logging/) | Configuration with file-based logging |
| [`basic-example-metrics`](./examples/basic-example-metrics/) | Setup with Prometheus and Grafana metrics |
| [`vault-secret-signer`](./examples/vault-secret-signer/) | Using HashiCorp Vault for key management |
| [`vault-transit-signer`](./examples/vault-transit-signer/) | Using Vault Transit for secure signing |
| [`evm-azure-key-vault-signer`](./examples/evm-azure-key-vault-signer/) | Using Azure Key Vault for EVM secure signing |
| [`evm-turnkey-signer`](./examples/evm-turnkey-signer/) | Using Turnkey Signer for EVM secure signing |
| [`solana-turnkey-signer`](./examples/solana-turnkey-signer/) | Using Turnkey Signer for Solana secure signing |
| [`solana-google-cloud-kms-signer`](./examples/solana-google-cloud-kms-signer/) | Using Google Cloud KMS Signer for Solana secure signing |
| [`stellar-gcp-kms-signer`](./examples/stellar-gcp-kms-signer/) | Using Google Cloud KMS Signer for Stellar secure signing |
| [`evm-cdp-signer`](./examples/evm-cdp-signer/) | Using CDP Signer for EVM secure signing |
| [`network-configuration-config-file`](./examples/network-configuration-config-file/) | Using Custom network configuration via config file |
| [`network-configuration-json-file`](./examples/network-configuration-json-file/) | Using Custom network configuration via json file |
| [`aws-sqs-queue-storage`](./examples/aws-sqs-queue-storage/) | Local SQS queue backend setup using LocalStack |
| [`gcp-pubsub-queue-storage`](./examples/gcp-pubsub-queue-storage/) | GCP Pub/Sub queue backend setup (emulator or real GCP) |
| [`rabbitmq-queue-storage`](./examples/rabbitmq-queue-storage/) | RabbitMQ queue backend setup (real broker, one command) |
| [`x402-facilitator-plugin`](./examples/x402-facilitator-plugin/) | x402 Facilitator plugin |
Each example includes:
- A README with step-by-step instructions
- Docker Compose configuration
- Required configuration files
## For Developers
### Technical Overview
The OpenZeppelin Relayer is built using Actix-web and provides HTTP endpoints for transaction submission, in-memory repository implementations, and configurable network policies.
The following diagram illustrates the architecture of the relayer service, highlighting key components and their interactions.
```mermaid
%%{init: {
'theme': 'base',
'themeVariables': {
'background': '#ffffff',
'mainBkg': '#ffffff',
'primaryBorderColor': '#cccccc'
}
}}%%
flowchart TB
subgraph "Clients"
client[API/SDK]
end
subgraph "OpenZeppelin Relayer"
subgraph "API Layer"
api[API Routes & Controllers]
middleware[Middleware]
plugins[Relayer Plugins]
end
subgraph "Domain Layer"
domain[Domain Logic]
relayer[Relayer Services]
policies[Policy Enforcement]
end
subgraph "Infrastructure"
repositories[Repositories]
jobs[Job Queue System]
signer[Signer Services]
provider[Network Providers]
end
subgraph "Services Layer"
transaction[Transaction Services]
vault[Vault Services]
webhook[Webhook Notifications]
monitoring[Monitoring & Metrics]
end
subgraph "Configuration"
config_files[Config Files]
env_vars[Environment Variables]
end
end
subgraph "External Systems"
blockchain[Blockchain Networks]
redis[Redis]
vault_ext[HashiCorp Vault]
metrics[Prometheus/Grafana]
notification[Notification Services]
end
%% Client connections
client -- "HTTP Requests" --> api
%% API Layer connections
api -- "Processes requests" --> middleware
middleware -- "Validates & routes" --> domain
middleware -- "Invokes" --> plugins
%% Domain Layer connections
domain -- "Uses" --> relayer
domain -- "Enforces" --> policies
relayer -- "Processes" --> transaction
plugins -- "Uses" --> relayer
%% Services Layer connections
transaction -- "Signs with" --> signer
transaction -- "Connects via" --> provider
transaction -- "Queues jobs" --> jobs
webhook -- "Notifies" --> notification
monitoring -- "Collects" --> metrics
signer -- "May use" --> vault
%% Infrastructure connections
repositories -- "Stores data" --> redis
jobs -- "Processes async" --> redis
vault -- "Secrets management" --> vault_ext
provider -- "Interacts with" --> blockchain
%% Configuration connections
config_files -- "Configures" --> domain
env_vars -- "Configures" --> domain
%% Styling
classDef apiClass fill:#f9f,stroke:#333,stroke-width:2px
classDef domainClass fill:#bbf,stroke:#333,stroke-width:2px
classDef infraClass fill:#bfb,stroke:#333,stroke-width:2px
classDef serviceClass fill:#fbf,stroke:#333,stroke-width:2px
classDef configClass fill:#fbb,stroke:#333,stroke-width:2px
classDef externalClass fill:#ddd,stroke:#333,stroke-width:1px
class api,middleware,plugins apiClass
class domain,relayer,policies domainClass
class repositories,jobs,signer,provider infraClass
class transaction,vault,webhook,monitoring serviceClass
class config_files,env_vars configClass
class blockchain,redis,vault_ext,metrics,notification externalClass
```
### Project Structure
The project follows a standard Rust project layout:
```sh
openzeppelin-relayer/
├── src/
│ ├── api/ # Route and controllers logic
│ ├── bootstrap/ # Service initialization logic
│ ├── config/ # Configuration logic
│ ├── constants/ # Constant values used in the system
│ ├── domain/ # Domain logic
│ ├── jobs/ # Asynchronous processing logic (queueing)
│ ├── logging/ # Logs File rotation logic
│ ├── metrics/ # Metrics logic
│ ├── models/ # Data structures and types
│ ├── repositories/ # Configuration storage
│ ├── services/ # Services logic
│ ├── plugins/ # Relayer plugins
│ └── utils/ # Helper functions
│
├── config/ # Configuration files
├── tests/ # Integration tests
├── docs/ # Documentation
├── scripts/ # Utility scripts
├── examples/ # Configuration examples
├── helpers/ # Rust helper scripts
└── ... other root files (Cargo.toml, README.md, etc.)
```
### Prerequisites
- Docker
- Rust
- Redis
- [Sodium](https://doc.libsodium.org/)
- [Node.js + Typescript + ts-node](https://nodejs.org/) (v20+) for plugins.
### Setup
To get started, clone the repository:
```sh
git clone https://github.com/openzeppelin/openzeppelin-relayer
cd openzeppelin-relayer
```
Run the following commands to install pre-commit hooks:
- Install pre-commit hooks:
```bash
pip install pre-commit
pre-commit install --install-hooks -t commit-msg -t pre-commit -t pre-push
```
> :warning: If you encounter issues with pip, consider using [pipx](https://pipx.pypa.io/stable/installation/) for a global installation.
- Install the toolchain:
```sh
rustup component add rustfmt
```
### Install Sodium
- Install stable libsodium version from [here](https://download.libsodium.org/libsodium/releases/).
- Follow steps to install libsodium from the [libsodium installation guide](https://doc.libsodium.org/installation).
> Note (Debian/Ubuntu): If you're compiling libsodium from source, install build-essential first.
```bash
sudo apt-get update && sudo apt-get install -y build-essential
```
### Install Node.js
- Install Node.js from [here](https://nodejs.org/).
- Install Typescript and ts-node:
```bash
npm install -g typescript ts-node
```
### Run Tests
To run tests, use the following commands:
```bash
cargo test
cargo test properties
cargo test integration
```
> :warning: Debian/Ubuntu: If you encounter OpenSSL build errors, install the required packages:
```bash
sudo apt-get update && sudo apt-get install -y pkg-config libssl-dev
```
#### Run tests against Redis
1. You can start a Redis instance using the following command:
```bash
docker run -d \
--name redis \
-p 6379:6379 \
redis:latest
```
2. Then remove the `#[ignore = "Requires active Redis instance"]` attribute from the tests you want to run.
3. Run the tests using single thread to avoid race conditions within suites:
````bash
cargo test your_test_regex -- --test-threads=1
### Config files
Create `config/config.json` file. You can use `config/config.example.json` as a starting point:
```sh
cp config/config.example.json config/config.json
````
Refer to the [Configuration References](https://docs.openzeppelin.com/relayer#configuration_references) section for a complete list of configuration options.
Create `.env` with correct values according to your needs from `.env.example` file as a starting point:
```sh
cp .env.example .env
```
### Queue backend configuration (Redis, SQS, Pub/Sub, or RabbitMQ)
The relayer supports four queue backends:
- `redis` (default): uses Apalis + Redis queues
- `sqs`: uses AWS SQS workers/cron and minimizes Apalis queue usage
- `pubsub` (alias `gcp-pubsub`): uses GCP Pub/Sub workers/cron; deferred jobs and
retry backoff are held in Redis and published when due
- `rabbitmq`: uses RabbitMQ workers/cron; one durable classic queue per queue
type, publisher-confirmed durable publishes, automatic reconnect; deferred
jobs and retry backoff are held in Redis and published when due (no broker
plugins required)
Set in `.env`:
```bash
QUEUE_BACKEND=redis
# or
# QUEUE_BACKEND=sqs
# or
# QUEUE_BACKEND=pubsub
# or
# QUEUE_BACKEND=rabbitmq
```
When using SQS:
```bash
QUEUE_BACKEND=sqs
AWS_REGION=us-east-1
AWS_ACCOUNT_ID=123456789012
# Optional: "auto" (default), "standard", or "fifo"
# SQS_QUEUE_TYPE=auto
# Optional alternative to AWS_ACCOUNT_ID:
# SQS_QUEUE_URL_PREFIX=https://sqs.us-east-1.amazonaws.com/123456789012/relayer-
```
By default (`SQS_QUEUE_TYPE=auto`), the relayer auto-detects whether queues are standard or FIFO at startup.
When using Pub/Sub:
```bash
QUEUE_BACKEND=pubsub
PUBSUB_PROJECT_ID=my-gcp-project
# Optional: prefix applied to all topic/subscription names (default: relayer)
# PUBSUB_TOPIC_PREFIX=relayer
# Optional: target the emulator and skip auth (local dev/test)
# PUBSUB_EMULATOR_HOST=localhost:8085
```
Pre-create the 8 topics/subscriptions (`{prefix}{queue}` / `{prefix}{queue}-sub`)
via your infrastructure. Authentication uses Application Default Credentials; the
on-demand backlog-depth read additionally needs `roles/monitoring.viewer`. No
dead-letter topic is required. See the
[`gcp-pubsub-queue-storage`](./examples/gcp-pubsub-queue-storage/) example for a
local emulator setup.
When using RabbitMQ:
```bash
QUEUE_BACKEND=rabbitmq
# Full AMQP URI (use amqps:// for TLS). Embeds credentials, so it is redacted in
# all logs/errors. Standard URI query params (e.g. ?heartbeat=20) pass through.
RABBITMQ_URL=amqp://user:pass@host:5672/%2f
# Optional: queue-name prefix (default: relayer); queues are {prefix}-{queue}
# RABBITMQ_QUEUE_PREFIX=relayer
# Optional: verify-only mode — never create queues, just check they exist
# (for locked-down brokers or pre-provisioned quorum queues). Default: false
# RABBITMQ_PASSIVE_QUEUES=false
```
By default the relayer declares its 8 durable queues at startup (needs
`configure` + `write` + `read` on `^{prefix}-.*`). With
`RABBITMQ_PASSIVE_QUEUES=true` it only verifies them (needs `write` + `read`) and
fails fast naming anything missing. Deferred jobs and retry backoff are held in
Redis and published when due. No broker plugins are required — works on
self-hosted RabbitMQ 3.13+/4.x, Amazon MQ for RabbitMQ, and CloudAMQP. See the
[`rabbitmq-queue-storage`](./examples/rabbitmq-queue-storage/) example for a
one-command local broker setup.
Use distributed mode for multi-instance deployments so scheduled workers use Redis-based distributed locks and avoid duplicate execution:
```bash
DISTRIBUTED_MODE=true
```
Redis queue workers include a unique process identifier in their consumer IDs.
This allows Redis to distinguish overlapping replicas during rolling deployments
and prevents a replacement replica from keeping a stopped replica's consumer
heartbeat alive. Jobs left in flight by a stopped replica are returned to the
queue once its heartbeat is older than Apalis's orphan threshold
(`reenqueue_orphaned_after`, 300 seconds by default), so periodic recovery takes
about five minutes from the last heartbeat.
Apalis also re-enqueues existing in-flight jobs whenever any replica starts,
including jobs that healthy replicas may still be processing.
Handlers must therefore tolerate concurrent duplicate execution. Deployments
should still allow the relayer time to handle its shutdown signal and drain
in-flight work.
For single-instance local development, keep:
```bash
DISTRIBUTED_MODE=false
```
> **Note**: After the service is running, all configuration components (relayers, signers, notifications) can also be managed via REST API endpoints for runtime changes. See the [Configuration Guide](https://docs.openzeppelin.com/relayer/configuration) for details on API-based configuration management.
### Creating a Signer
To create a new signer keystore, use the provided key generation tool:
```sh
cargo run --example create_key -- \
--password DEFINE_YOUR_PASSWORD \
--output-dir config/keys \
--filename local-signer.json
```
Then update the `KEYSTORE_PASSPHRASE` field in your `.env` file with the password you used in the key creation example.
The tool supports the following options:
- `--password`: Required. Must contain at least:
- 12 characters
- One uppercase letter
- One lowercase letter
- One number
- One special character
- `--output-dir`: Directory for the keystore file (creates if not exists)
- `--filename`: Optional. Uses timestamp-based name if not provided
- `--force`: Optional. Allows overwriting existing files
Example with all options:
```sh
cargo run --example create_key -- \
--password "YourSecurePassword123!" \
--output-dir config/keys \
--filename local-signer.json \
--force
```
### Configure Webhook URL
`/config/config.json` file is partially pre-configured. You need to specify the webhook URL that will receive updates from the relayer service.
For simplicity, visit [Webhook.site](https://webhook.site), copy your unique URL, and then update the notifications[0].url field in `config/config.json` with this value.
### Configure Webhook Signing Key
To sign webhook notification payloads, populate the `WEBHOOK_SIGNING_KEY` entry in the `.env` file.
For development purposes, you can generate the signing key using:
```bash
cargo run --example generate_uuid
```
> Note: Alternatively, you can use any online UUID generator.
Copy the generated UUID and update the `WEBHOOK_SIGNING_KEY` entry in the `.env` file.
### Configure API Key
Generate an API key signing key for development purposes using:
```bash
cargo run --example generate_uuid
# or run this command to generate a UUID
# uuidgen
```
> Note: Alternatively, you can use any online UUID generator.
Copy the generated UUID and update the `API_KEY` entry in the `.env` file.
### Starting Redis manually (without docker compose)
You can start Redis in one of two ways:
A. _Expose to Host Only_
Use this if only your host machine needs direct access to Redis (e.g., for local testing with redis-cli).
```bash
docker run -d \
--name redis \
-p 6379:6379 \
redis:latest
```
`-p 6379:6379` binds the container port to your localhost on the same port.
B. _Connect with Other Containers via Custom Network_
Use this if relayer container need to talk to Redis.
```sh
docker run -d \
--name redis \
--network relayer-net \
redis:latest
```
`--network relayer-net` attaches Redis to the network you created in step 1.
> Note: Make sure to create a dedicated network for the relayer and Redis containers to communicate. You can create a network using the following command `docker network create relayer-net`.
## Configure a plugin
In order to create and run plugins please follow the [Plugins README](./plugins/README.md) file instructions.
## Running the relayer locally
Install dependencies:
```sh
cargo build
```
Run relayer:
```sh
cargo run
```
## Test the Relayer
The service is available at `http://localhost:8080/api/v1`
```bash
curl -X GET http://localhost:8080/api/v1/relayers \
-H "Content-Type: application/json" \
-H "AUTHORIZATION: Bearer YOUR_API_KEY"
```
### Running services with docker compose
If you use `docker-compose` over `docker compose` please read [Compose V1 vs Compose V2](#compose-v1-vs-compose-v2) section.
Based on your `.env` file, docker compose may or may not start the metrics server ( within relayer app container), prometheus and grafana.
> Note: If you want to start the metrics server, prometheus and grafana, make sure to set `METRICS_ENABLED=true` in your `.env` file.
If you want to start the services using [make](./Makefile.toml) target, you can use the following command to start the services:
```sh
cargo make docker-compose-up
```
> Note: By default docker compose command uses Dockerfile.development to build the image. If you want to use Dockerfile.production, you can set: `DOCKERFILE=Dockerfile.production` before running `cargo make docker-compose-up`.
We have a [make](./Makefile.toml) target to start the services with docker compose with metrics profile based on your `.env` file. For metrics server you will need to make sure `METRICS_ENABLED=true` is set in your `.env` file. If you want to start the services directly using docker compose, you can use the following command:
```sh
# without metrics profile ( METRICS_ENABLED=false by default )
# will only start the relayer app container and redis container
docker compose up -d
# or with metrics profile ( METRICS_ENABLED=true in .env file )
# docker compose --profile metrics up -d
```
Make sure the containers are running without any restarts/issues:
```sh
docker ps -a
```
To stop the services, run the following command:
```sh
cargo make docker-compose-down
# or
# using docker compose without make target
# without metrics profile
# docker compose down
# or with metrics profile
# docker compose --profile metrics down
```
To check the logs of the services/containers, run the following command:
```sh
docker compose logs -f
```
## Compose V1 vs Compose V2
- If you use `docker-compose` command, it will use Compose V1 by default which is deprecated. We recommend using `docker compose` command.
- You can read more about the differences between Compose V1 and Compose V2 [here](https://docs.docker.com/compose/intro/history/).
- You can also check out the issue [here](https://github.com/OpenZeppelin/openzeppelin-relayer/issues/64).
## Documentation
- All the documentation is under `docs/` directory.
- You can directly make changes to the specific files and raise a PR on this repo as well as on [docs](https://github.com/OpenZeppelin/docs) repo for the content that is modified.
- To generate technical rust documentation locally, run the following command
```sh
cargo make rust-docs
```
- Rust docs will be generated in `docs/build/site/openzeppelin_relayer/` directory.
## Observability
- Currently we support logs and metrics ( uses prometheus and grafana) for the relayer server.
### Logs
- For logs, our app defaults to writing logs to stdout/console. You can also configure it to write logs to a file path by setting `LOG_MODE` to `file`. See [docker compose file](./docker-compose.yaml) for more details.
### Metrics
- Metrics server is started on port `8081` by default, which collects the metrics from the relayer server.
- Exposes list of metrics on the `/metrics` endpoint.
> Note: By default, we don't map this port to the host machine. If you want to access the metrics server from the host machine, you can update the `docker-compose.yaml` file.
- Exposes `/debug/metrics/scrape` endpoint for prometheus to scrape metrics.
- To view prometheus metrics in a UI, you can use `http://localhost:9090` on your browser.
- To view grafana dashboard, you can use `http://localhost:3000` on your browser.
## Contributing
We welcome contributions from the community! Here's how you can get involved:
1. Fork the repository
2. Create your feature branch
3. Commit your changes
4. Push to the branch
5. Create a Pull Request
If you are looking for a good place to start, find a good first issue [here](https://github.com/openzeppelin/openzeppelin-relayer/issues?q=is%3Aissue%20is%3Aopen%20label%3Agood-first-issue).
You can open an issue for a [bug report](https://github.com/openzeppelin/openzeppelin-relayer/issues/new?assignees=&labels=T-bug%2CS-needs-triage&projects=&template=bug.yml), [feature request](https://github.com/openzeppelin/openzeppelin-relayer/issues/new?assignees=&labels=T-feature%2CS-needs-triage&projects=&template=feature.yml), or [documentation request](https://github.com/openzeppelin/openzeppelin-relayer/issues/new?assignees=&labels=T-documentation%2CS-needs-triage&projects=&template=docs.yml).
You can find more details in our [Contributing](CONTRIBUTING.md) guide.
Please read our [Code of Conduct](CODE_OF_CONDUCT.md) and check the [Security Policy](SECURITY.md) for reporting vulnerabilities.
## License
This project is licensed under the GNU Affero General Public License v3.0 - see the [LICENSE](LICENSE) file for details.
## Security
For security concerns, please refer to our [Security Policy](SECURITY.md).
### Custom RPC URL Security
The relayer includes built-in protection against Server-Side Request Forgery (SSRF) attacks when using custom RPC URLs. You can configure the following security features via environment variables:
- **`RPC_ALLOWED_HOSTS`**: Comma-separated list of allowed RPC hostnames/IPs. If non-empty, only URLs with these hosts are permitted.
- Example: `RPC_ALLOWED_HOSTS=eth-mainnet.g.alchemy.com,mainnet.infura.io`
- **`RPC_BLOCK_PRIVATE_IPS`**: Block private IP addresses (RFC 1918, loopback, link-local). Set to `true` to prevent RPC URLs from targeting private networks.
- Example: `RPC_BLOCK_PRIVATE_IPS=true`
- Default: `false` (for backwards compatibility)
**Note:** Cloud metadata endpoints (`169.254.169.254`, `fd00:ec2::254`) are **always blocked** to prevent credential theft, regardless of configuration.
**Recommended Production Configuration:**
```bash
RPC_BLOCK_PRIVATE_IPS=true
RPC_ALLOWED_HOSTS=eth-mainnet.g.alchemy.com,mainnet.infura.io,eth.llamarpc.com
```
See [`.env.example`](.env.example) for more configuration examples.
## Get Help
If you have any questions, first see if the answer to your question can be found in the [User Documentation](https://docs.openzeppelin.com/relayer/).
### Community Support
- **GitHub Issues**: Open a [bug report](https://github.com/openzeppelin/openzeppelin-relayer/issues/new?assignees=&labels=T-bug%2CS-needs-triage&projects=&template=bug.yml) or [feature request](https://github.com/openzeppelin/openzeppelin-relayer/issues/new?assignees=&labels=T-feature%2CS-needs-triage&projects=&template=feature.yml)
- **Good First Issues**: [Find beginner-friendly issues](https://github.com/openzeppelin/openzeppelin-relayer/issues?q=is%3Aissue+is%3Aopen+label%3Agood-first-issue)
- **GitHub Discussions**: For questions and community interaction
We encourage you to reach out with any questions or feedback.
## Maintainers
See [CODEOWNERS](CODEOWNERS) file for the list of project maintainers.