Coinbase opened Base mainnet to the public

Coinbase-incubated Base opened its mainnet to the public on August 9, 2023, moving the Ethereum layer-two network from staged developer access into general availability. Base said more than 100 decentralized applications and service providers were available for the launch, alongside integrations with Coinbase products.

The opening mattered beyond the arrival of another Ethereum scaling network. Coinbase was best known as a centralized exchange, custodian and brokerage. Base placed the publicly traded company closer to the infrastructure on which applications and transactions operated, creating a possible new source of network fees and giving Coinbase a direct role in distributing blockchain applications to its existing customers.

Contemporaneous reporting from CoinDesk and Blockworks confirmed the August 9 public opening. Both described Base as an Ethereum layer-two network built with Optimism’s OP Stack. CoinDesk reported that public access began at 12 p.m. Eastern Time, distinguishing the general-availability event from the network’s earlier technical deployment.

A staged path to general availability

Base did not materialize for the first time on August 9. Its testnet had launched on February 23, 2023, and developers received mainnet access on July 13, 2023. During the developer phase, Base asked builders to deploy contracts and prepare applications while holding their public interfaces until general availability.

That chronology is important. The August 9 event was a public launch, not the genesis of the underlying chain. Some users had already transferred ether to Base before general availability, and applications had already been deployed. The verified development was that Base officially opened the network and its application ecosystem to everyone.

Base used ETH for transaction fees and said it had no plans to issue a separate network token. That decision reduced the launch’s dependence on a new speculative asset and aligned Base’s economics more closely with Ethereum and Coinbase’s infrastructure strategy.

As a layer-two system, Base was designed to process activity away from Ethereum’s primary execution layer while settling transaction data on Ethereum. Building with the open-source OP Stack also connected Base to Optimism’s broader effort to create compatible layer-two networks. Claims about low costs, speed and security on August 9 were largely project descriptions, however; general availability by itself did not prove sustained performance under long-term production demand.

Distribution was Coinbase’s differentiator

The principal strategic advantage was distribution. Independent scaling networks could attract developers, but Coinbase could expose Base applications through Coinbase Wallet and other company products. Base’s launch announcement framed that integration as a path for bringing existing customers into onchain applications spanning finance, art, music, games and social products.

Coinbase paired the opening with “Onchain Summer,” a multi-week promotional program involving 50 builders, brands, creators and artists. Base also advertised more than 100 ETH in grants and a commemorative “Base, Day One” NFT. Those figures were launch-day statements from Base, not independently audited measures of adoption or economic activity.

What the launch did not establish

Base described itself as an open ecosystem and said it intended to decentralize progressively. On August 9, 2023, those ambitions remained plans rather than completed outcomes. Public access did not establish how quickly control would be distributed, how durable application demand would become, or whether Coinbase’s consumer reach would translate into recurring activity.

No token-price, trading-volume or total-value-locked claim is used here because the surviving sources do not provide an immutable, consistently timed market dataset for the full August 9 measurement window. The defensible conclusion is narrower: Coinbase successfully moved Base into public general availability, giving a major centralized crypto company a new position in Ethereum’s layer-two ecosystem while leaving adoption, economics and decentralization to be tested after launch.