Indexed BaseBlockchain Data

Base is an optimistic rollup that settles on Ethereum, built by Coinbase on the OP Stack and opened to the public on 9 August 2023. It has no token of its own, and gas is paid in ETH. Blocks are produced every two seconds by a single sequencer, and the canonical chain is derived from the batches that sequencer posts to Ethereum, so finality here is Ethereum’s finality arriving late rather than a property of Base’s own consensus. Execution is EVM-equivalent: the same bytecode, the same ABIs and the same twenty-byte addresses, plus two record types that only exist on a rollup. Deposit transactions are created by messages from Ethereum and carry no ordinary signature, and a system transaction at the head of every block writes the L1 attributes the chain needs. Fees are charged in two parts, one for execution and one for the Ethereum data a batch consumes. Since the Dencun upgrade of March 2024 that data has traveled as blobs rather than calldata.

SonarX indexes Base end to end: blocks and headers, transactions and receipts, event logs decoded against contract ABIs, execution traces including internal value transfers, and token transfers and balances. Rollup-specific records are kept rather than flattened away, so deposits, withdrawal initiations and the two halves of a transaction’s cost are all present. The normalized model is the one SonarX uses across every network it covers, so Base joins to its settlement layer in a single query instead of across two pipelines.

Full historical coverage is available today as a data-share or a file delivery. Real-time delivery keeps the same dataset current to chain tip. Point-in-time balance tables, the real-time balances API and the batch wallets, tokens and balances API are all available for Base. Kafka streaming carries the same records as a live topic today.

A rollup’s history is not self-contained, which is the whole difficulty. Base’s canonical chain is derived from data posted to Ethereum, so an L1 reorg can invalidate an unconfirmed head that already looked settled, and the indexer has to follow the derivation rather than trust the sequencer’s output. Deposits and withdrawals are half-recorded on each chain: a withdrawal proved and finalized on Ethereum weeks after it was initiated on Base is one economic event with two timestamps. Fee accounting needs both components or it reports the wrong number, and after Dencun the L1 half is priced against a blob market that moves independently of Base’s own activity.

Base carries a large share of consumer-scale onchain activity, and the work reflects it. Wallet and retention analysis is the common one: cohorts of addresses followed across apps, which needs decoded logs and traces together rather than transfer counts. Payment and stablecoin flow analysis is second, tracing ERC-20 movement between exchanges, apps and bridges where a rollup’s low fees change user behavior rather than the accounting. Third is rollup economics, comparing what a chain charges users against what it pays Ethereum for data, a calculation only possible with both fee components in one place. All three need the deposit and withdrawal records intact, because a user’s first appearance on Base is usually a bridge transaction rather than a wallet creation, and a cohort that starts at the first swap misses where the money came from. DeFi analytics work spans Base and Optimism together, since the two share a codebase and a record structure.

Tell us the delivery target, how far back you need and how fresh it has to be, and the share is scoped against that. Base history and the balance APIs are available now, so a first delivery is provisioning rather than engineering. The published coverage matrix for every network SonarX indexes lives in the data documentation, and the rest of the catalogue is at all indexed chains.