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The Startale App SDK supports two networks today.
NetworkChain IDUse for
Soneium Mainnet1868Production
Soneium Minato1946Testing

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Public RPC endpoints

NetworkRPC URL
Soneium Mainnethttps://rpc.soneium.org/
Soneium Minatohttps://rpc.minato.soneium.org/
These public endpoints are rate-limited and intended for development. For production traffic, run your own node or use an infrastructure partner. See the Soneium builder docs for the current options.

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Block explorers

NetworkExplorer
Soneium Mainnetsoneium.blockscout.com
Soneium Minatosoneium-minato.blockscout.com

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Chain definitions

Both chains are exported by viem/chains and wagmi/chains: 
import { soneium, soneiumMinato } from 'wagmi/chains'

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Declaring supported chains

For the wagmi connector, the chain list comes from wagmi’s createConfig({ chains }) array. startaleConnector() derives appChainIds from it automatically: 
createConfig({
  chains: [soneium, soneiumMinato],
  transports: {
    [soneium.id]: http(),
    [soneiumMinato.id]: http(),
  },
  connectors: [startaleConnector({ /* ... */ })],
})

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Switching networks

Use wagmi’s useSwitchChain() or the raw provider’s wallet_switchEthereumChain method. The popup confirms the switch with the user before the chain changes. 
import { useSwitchChain } from 'wagmi'

const { switchChain } = useSwitchChain()
switchChain({ chainId: 1946 })
Inside a Mini App, wallet_switchEthereumChain is forwarded by the SDK but the host may reject the request. The Startale App host controls the active chain; treat a rejection as a host-enforced constraint. See Mini App wallet integration for the full constraint surface.

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Stablecoin

USDSC is the canonical stablecoin on Soneium.
NetworkUSDSC contract
Soneium Mainnet0x3f99231dD03a9F0E7e3421c92B7b90fbe012985a
Soneium Minato0xF2c10dC1beB13ee96036DE3F922eA871Ff2e0A7e
See Pay with USDSC for full transfer examples.

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Testnet ETH

For Soneium Minato testing, see the Soneium faucets list maintained by the Soneium team. It lists the current providers and their daily limits. If a faucet runs out, claim Sepolia ETH from any Ethereum testnet faucet and bridge it to Minato through the Soneium Bridge.

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Testnet USDSC

There is no public USDSC faucet on Soneium Minato today. If you need to test token interaction, you can deploy your own token.