Networks

A network preset carries everything connect() needs to reach one deployment: the chain id, the pool and relayer contract addresses, the service URLs, and the tree depth the circuit was built for. Pass a built-in name or your own preset object; an unknown name throws at connect() time.

Preset	chainId	Status
anvil	31337	local
localnet	31337	local (anvil alias)
mainnet	1	deployed
base	8453	deployed
arbitrum	42161	deployed
sepolia	11155111	placeholder → NetworkNotDeployedError

The three deployed chains share one relayer and one FMD server; only the chainId differs.

A preset is a placeholder when its maspAddress or relayerAddress is null, and that is what connect() refuses on. sepolia carries service URLs and a deploymentStatusUrl but no contracts yet.

Custom network

Pass a NetworkPreset object in place of the name.

import { connect, type NetworkPreset } from "@lelantos-org/sdk";

const myChain: NetworkPreset = {
    chainId: 8453n,
    maspAddress: "0x0000000000000000000000000000000000000001",
    relayerAddress: "0x0000000000000000000000000000000000000002",
    relayerUrl: "https://relayer.my-deployment.example",
    fmdUrl: "https://fmd.my-deployment.example",
    treeDepth: 10,
    permit2Address: "0x000000000022D473030F116dDEE9F6B43aC78BA3", // optional
};

const wallet = await connect({ privateKey: pk, network: myChain, rpcUrl });

Set maspAddress or relayerAddress to null to mark a preset as a placeholder; connect() then throws NetworkNotDeployedError.

treeDepth must match the deployed contract and the circuit build. A mismatch is not caught locally — the proof simply fails to verify on chain.

Next

• Chain adapters — building the adapter yourself
• Errors
• Browser usage