Blockchain

Somnia is an EVM-compatible chain: the Somnia Global L1, plus Regional Subchains placed in trading hubs. This section covers the networks, how they work, the explorer's pages for the chain and the protocols that span its networks.

Somnia is made up of the Somnia Global L1 and Regional Subchains. The Global L1 is run by validators around the world, and holds the assets, accounts and settlement that every subchain shares. Regional Subchains are lower-latency chains with validators in specific trading hubs.

Network	Status	What it is
Somnia Global L1	Live	The main chain, chain ID 5031
Tokyo Subchain	Live	A Regional Subchain with validators in Tokyo, chain ID 50321
Somnia networks	Live	Every network, with chain ID, currency, RPC and explorer

For chain IDs, RPC URLs and explorers, see Somnia networks and Network info; to add a network to your wallet, see Connect a wallet.

The products of the chain itself, as the Somnia Explorer's Blockchain section lists them:

Product	Status	What it is
Somnia Explorer	Live	The chain and every product on it, live, with APIs for agents
Faucet	Live	Test STT for the testnets
Validators	Live	This epoch's committee, every validator's stake and delegation
RPCs	Live	The public HTTP and WebSocket endpoints; dedicated nodes coming soon
Somnia Bridge	Live	Moves tokens between Global and Tokyo
Somnia Accounts	Live	Accounts at the same address on every Somnia network
Somnia Reactivity	Live	Contracts that react to events in the same block, no keepers
Somnia Gas Sponsorship	Coming soon	Native gas sponsorship, so users trade without holding SOMI

How the chain works

MultiStream consensus. Every validator publishes its own data chain. A separate consensus chain, running modified PBFT, advances the heads of all data chains at once.
Global ordering. A deterministic pseudorandom ordering of the data chains produces a single ordered stream of transactions.
Compiled execution. EVM bytecode is compiled to native code.
IceDB. A purpose-built database with built-in snapshotting.
Compression. Streaming compression and BLS signature aggregation reduce bandwidth.
Cuthbert. Validators also run every transaction through Cuthbert, a separate, unoptimised implementation, and halt if the two disagree.

Chain features

EVM compatible. Solidity contracts, standard wallets and existing tooling work unchanged.
Finality. Transactions are final in under 500 ms on mainnet.
Gas price. The base price is 6 gwei outside of congestion. At that price, a plain SOMI transfer (21,000 gas) costs 0.000126 SOMI. Transfers to contracts, and other calls, cost more, in proportion to the gas they use.
Sustained-use discounts. High-volume senders get automatic 70% or 90% base-fee discounts.
Proof of stake. Validators stake SOMI and can be slashed for malicious behaviour.
ERC-4337 EntryPoint v0.7. Deployed on mainnet, so gas can be sponsored through ERC-4337 paymasters.
EIP-7702. Externally owned accounts can delegate to smart-account code.

Example

chain.ts

import { defineChain } from "viem";

export const somnia = defineChain({
  id: 5031,
  name: "Somnia Mainnet",
  nativeCurrency: { name: "Somnia", symbol: "SOMI", decimals: 18 },
  rpcUrls: {
    default: {
      http: ["https://api.infra.mainnet.somnia.network"],
      webSocket: ["wss://api.infra.mainnet.somnia.network/ws"],
    },
  },
  blockExplorers: {
    default: { name: "Somnia Explorer", url: "https://explorer.somnia.network" },
  },
});

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