Optimism: selling the chain-building kit has worked better than its own chain

In one sentence

“Optimism” now refers to three things, which are easy to mix up:

OP Mainnet: the Layer 2 Optimism runs itself. It works like Base and Arbitrum, as an Optimistic Rollup (the basics are at the start of the Base guide).
OP Stack: the open-source toolkit for building this kind of Layer 2. Base and many other chains are built with it.
Superchain: the set of chains built on the OP Stack that also join Optimism’s governance and revenue sharing, aiming to make them interoperate as if they were one chain.

So with Optimism, what matters is not how big OP Mainnet is, but how widely its technology is used.

Where it came from

2019: a team that had been researching Plasma scaling switched to rollups and founded Optimism.
December 2021: OP Mainnet opened to everyone.
May 2022: the OP token was issued and airdropped, and bicameral governance was set up.
June 2023: the Bedrock upgrade made the whole codebase modular, which became the OP Stack. The same year Base announced it would build on the OP Stack.
June 2024: fraud proofs went live on mainnet so anyone can challenge a wrong result, and L2BEAT raised its rating to Stage 1.

Bicameral governance and OP

Optimism’s governance has two “houses”:

Token House: OP holders (or delegates they choose) vote on protocol upgrades and treasury spending.
Citizens’ House: a group of verified “citizens” mainly responsible for “retroactive public goods funding”, rewarding projects and developers after the fact for what they have already contributed.

Like ARB, OP is not used to pay fees. Chains in the Superchain (such as Base) pass part of their sequencer revenue to the Optimism Collective, which is Optimism’s main source of income. OP’s market cap is $315.5M.

l2beat riskData as of 16 Oct 2026, 01:45 UK time · source L2BEAT

Security stage: Stage 1 (Optimistic Rollup)

Stage 0
Still on "training wheels": proofs may not be live, or the operator can change the rules alone
Stage 1
Proofs are live, but a security council can still override or upgrade in an emergency
Stage 2
Fully governed by code and proofs; nobody can change outcomes unilaterally

If the sequencer failsIf the official sequencer goes down or censors you, can you still force your transaction in?

Self sequence

Good

State validationWho guarantees that the state the Layer 2 posts to Ethereum is correct

Fraud proofs (INT)

Good

Data availabilityIs all transaction data published on Ethereum, so the chain can be rebuilt if something goes wrong

Onchain

Good

Exit windowDo users have time to withdraw before the contracts are upgraded

None (can be upgraded instantly)

Poor

If the proposer failsIf the role that posts state to Ethereum stops, can users still withdraw

Self propose

Good

What is on-chain today

live dataData as of 16 Oct 2026, 01:45 UK time

Security stage (L2BEAT)Stage 1Optimistic Rollup (fraud proofs)

Value secured (TVS)$2.01BAll assets on the chain, per L2BEAT

Token market cap$315.5MMarket cap rank #142

TVL$445.8MAssets in DeFi protocols

Stablecoins$605.2MUSDT, USDC and others combined

24h DEX volume$43.3M30 days $1.56B

24h fees$2,83230 days $85K

Block time (measured)2.00 saverage of the last 10K blocks

Stablecoin mix total $605.2M

USDT 58% $353.4M
USDC 28% $169.8M
Other 14% $81.9M

Top 6 protocols by TVL TVL on this chain

EtherFi Borrowing MarketLending$300.6M
EtherFi Cash LiquidCrypto Card Issuer$241M
Nonce CapitalRisk Curators$218.5M
VedaOnchain Capital Allocator$212.3M
Aave V3Lending$51M
Uniswap V3Dexs$18.7M

Sources: CoinGecko (market cap, supply), DefiLlama (TVL, stablecoins, DEX volume, fees, protocols), measurements from public nodes (block time, validators).

OP Mainnet itself has $445.8M locked and $43.3M of 24-hour DEX volume, an order of magnitude smaller than Base, which runs on the same OP Stack. Putting the two OP Stack chains side by side makes it clearer:

compare

The same OP Stack, two very different chains

Data as of 16 Oct 2026, 01:45 UK time

TVL

Optimism$445.8M

Base$6.17B

Stablecoins

Optimism$605.2M

Base$5.19B

24h DEX volume

Optimism$43.3M

Base$1.5B

24h fees

Optimism$2,832

Base$95K

Block timeshorter is faster (log scale)

30ms100ms300ms1s3s10s30s

Optimism · 2.00 s

Base · 2.00 s

L2BEAT security stagethe higher the stage, the less you rely on the operator

OptimismStage 1

BaseStage 1

Dollar figures from DefiLlama; block times are measured averages over the last 10,000 blocks on public nodes (the last hour of slots for Solana); security stages from L2BEAT.

Strengths and trade-offs

Strengths

The OP Stack is open source and widely adopted, and chains in the ecosystem share the same technology, lowering the barrier to future interoperability.
Fraud proofs are open to everyone; L2BEAT rates it Stage 1.
Governance is fairly complete, with a dedicated mechanism for funding public goods.

Trade-offs

OP Mainnet's own funds and volume are far smaller than Base and other OP Stack chains; most of the ecosystem's activity is not on it.
A single sequencer, and the Security Council can upgrade contracts immediately in an emergency.
OP's value depends on Superchain revenue sharing and governance rights, and has little to do with how much OP Mainnet itself is used.

Investigating a project on Optimism? Check these first

01
First work out which chain the project is on: OP Mainnet, Base or another OP Stack chain. The address format is the same, but the chains differ and assets do not move between them automatically.
02
Verify any "Superchain airdrop" or "official OP campaign" against the Optimism website and its official X account.
03
Check upgradeability, owner permissions and where the top ten holders' tokens came from, as on Ethereum.

Data and sources

Live figures: CoinGecko (OP market cap), DefiLlama, L2BEAT and a public OP Mainnet node (measured block time).
Mechanisms are based on the official Optimism documentation and L2BEAT’s project page.
This guide is educational and is not investment advice.