Chains

Chain configurations for Seismic networks

The seismic-alloy SDK supports multiple Seismic networks. Each chain has a specific chain ID, RPC endpoint, and recommended network type. This section documents the available chains and how to connect to them.

Overview

Unlike the Python SDK, seismic-alloy does not use pre-configured chain objects. Instead, you pass the RPC URL directly to the provider constructor and select the appropriate network type (SeismicReth or SeismicFoundry). The chain ID is fetched automatically from the node.

use seismic_prelude::foundry::*;
use alloy_signer_local::PrivateKeySigner;

let signer: PrivateKeySigner = "0xYOUR_PRIVATE_KEY".parse()?;
let wallet = SeismicWallet::from(signer);

// Testnet
let url = "https://gcp-1.seismictest.net/rpc".parse()?;
let provider = sreth_signed_provider(wallet, url).await?;

// Local (Sanvil)
let url = "http://127.0.0.1:8545".parse()?;
let provider = sfoundry_signed_provider(wallet, url).await?;

Supported Chains

Chain	Chain ID	RPC URL	Network Type	Description
Seismic Testnet	5124	https://gcp-1.seismictest.net/rpc	SeismicReth	Public testnet for development and testing
Sanvil (local)	31337	http://127.0.0.1:8545	SeismicFoundry	Local development node

Choosing a Chain

Are you developing and want to test against a live network?
  -> Use Seismic Testnet with SeismicReth

Are you running tests locally or doing rapid iteration?
  -> Use Sanvil with SeismicFoundry

Chain ID Handling

The Alloy provider automatically fetches the chain ID from the connected node via the ChainIdFiller. You do not need to specify it manually in most cases. The chain ID is used for:

• EIP-155 replay protection in transaction signing

• EIP-712 typed data signing

• Transaction validation

use seismic_prelude::foundry::*;

let url = "https://gcp-1.seismictest.net/rpc".parse()?;
let provider = sreth_unsigned_provider(url);

// Chain ID is fetched from the node
let chain_id = provider.get_chain_id().await?;
println!("Chain ID: {chain_id}");  // 5124 for testnet

Pages

Page	Description
Seismic Testnet	Public testnet configuration and usage
Sanvil	Local development with Sanvil

See Also

• Network Overview - Network types for each chain

• SeismicReth - Production network type

• SeismicFoundry - Development network type

• Installation - Cargo setup and prerequisites