Base (Ethereum L2)

Base is an Ethereum Layer 2 (L2) network incubated by Coinbase and built on the OP Stack, the open-source rollup framework behind Optimism. As an L2, it processes transactions off Ethereum mainnet, batches them, and posts the results back to Ethereum — inheriting mainnet's security while charging a small fraction of its fees.

For users the experience is ordinary Ethereum: the same addresses, the same tokens (including USDC), the same tooling. The differences are economic — fees of a fraction of a cent and confirmation in a few seconds.

Ethereum mainnet is secure but expensive for small transfers; at busy times a simple token transfer can cost more than the amount being sent. Layer 2 networks exist to fix exactly that: by executing transactions off-chain and settling compressed batches on-chain, they spread mainnet's security cost across thousands of transactions.

The practical consequence is that payments too small to make sense on mainnet — a cent, two cents — become routine. That property, more than any other, is why Base matters to agent payments.

x402 is a per-call payment protocol: an AI agent pays for a single API or MCP tool call, with a minimum price of $0.01. That model only works if the cost of moving the money is far below the payment itself and if settlement is fast enough to sit inside a request/response cycle. Base delivers both — sub-cent fees and settlement in roughly two seconds, fast enough that the payment clears before the tool handler runs.

Deep native USDC liquidity helps too: Circle issues USDC natively on Base, so agents transact in a dollar-pegged unit without bridging or price risk in the middle of a workflow.

When an agent calls a paid listing on the Loomal Index, the server responds with HTTP 402 and a price. The agent's wallet signs the payment, the call retries, and USDC moves on Base before the handler executes. The response carries a Base transaction hash alongside an Ed25519 signed receipt — so every payment is independently verifiable on a public block explorer.

Because on-chain settlement is final, there is no chargeback window. For sellers of machine-priced calls this is a feature: revenue recognized in two seconds stays recognized.

Less than the word "blockchain" suggests. An agent operator funds a wallet with USDC on Base and sets spending limits; the x402 client libraries handle signing and retries. A server owner pricing a listing on Loomal receives USDC to an address they control. Gas fees exist but are economically negligible at Base's price levels, and the unit of account throughout is the dollar-pegged USDC, not a volatile asset.

The chain is, in effect, plumbing. Most people interacting with Base through x402 never look at a block explorer unless they want to verify a specific receipt — at which point the public ledger becomes a feature rather than a complication.