Chains

Most Seashail tools accept a chain argument. The chain value must match Seashail's configured identifiers.

Default Chain Identifiers

Solana:

• solana

EVM mainnets:

• ethereum (chain id 1)
• base (8453)
• arbitrum (42161)
• optimism (10)
• polygon (137)
• bnb (56)
• avalanche (43114)
• monad (143)

EVM testnets:

• sepolia (11155111)
• base-sepolia (84532)
• arbitrum-sepolia (421614)
• optimism-sepolia (11155420)
• polygon-amoy (80002)
• bnb-testnet (97)
• avalanche-fuji (43113)
• monad-testnet (10143)

If you are unsure what your local Seashail instance is configured with, call:

• get_capabilities

Network Mode Defaults

Network mode is a convenience setting that affects which chains Seashail uses when a tool omits chain / chains.

• mainnet defaults to: solana plus all configured EVM mainnets
• testnet defaults to: solana plus all configured EVM testnets

Network mode does not block explicit selection. If a tool passes chain="ethereum", Seashail will use Ethereum regardless of mode.

RPC Configuration

You can override RPC endpoints with:

• configure_rpc

Notes:

• configure_rpc supports chain="solana" and any EVM chain that already exists in your config.toml.
• configure_rpc does not add new EVM chains. To add a new EVM chain, you must edit config.toml to include both:
  • [rpc.evm_rpc_urls]
  • [rpc.evm_chain_ids]

Adding New EVM Chains (Config File)

In config.toml, add entries like:

[rpc.evm_rpc_urls]
mychain = "https://..."

[rpc.evm_chain_ids]
mychain = 12345

After updating config, Seashail will treat chain="mychain" as an EVM chain for tools that support EVM.