Indexed ArcBlockchain Data

Arc is Circle’s Layer 1 for stablecoin finance, described by Circle as an open blockchain network built for the world’s financial markets, real-time money movement and agentic economic activity. Public mainnet opened on 16 September 2026. It is EVM-compatible and runs Reth, a Rust implementation of the Ethereum execution client, so contracts written for Ethereum deploy unchanged and addresses, receipts and event logs take the shapes an EVM pipeline already reads. Underneath, the chain is unlike Ethereum. Consensus is Malachite, a high-performance implementation of the Tendermint BFT protocol, run by a proof-of-authority validator set composed of regulated institutions; the founding cohort announced alongside Circle includes BlackRock, DTCC, Galaxy, Global Payments, ICE, Mastercard, MoneyGram, SBI Group, Standard Chartered, Sumitomo Corporation and Visa. Finality is deterministic and instant: a transaction is final on inclusion, in under a second, with no reorganization risk. USDC is the native gas token, and a fee manager stabilizes gas fees using USDC as the unit of account, so the cost of a transaction is a dollar figure rather than a function of a volatile coin.

SonarX indexes Arc 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. The same normalized model is used on every chain SonarX covers, so an Arc query and an Ethereum query take the same shape and join without a translation layer.

Historical coverage as a data-share or a file delivery, real-time delivery to chain tip, Kafka streaming, balance tables and the balance APIs are all enabled for Arc on request: tell us which surfaces you need and the share is scoped against that.

Two properties of Arc shape how its data is read. The first is the gas token. USDC on Arc is one balance behind two interfaces: a native interface with 18 decimals, used for gas and native value transfers, and an ERC-20 interface with 6 decimals. A dollar moved natively and a dollar moved as a token therefore carry different raw values, and a successful native transfer also emits a standard ERC-20 Transfer log from a system address, so the two views can be reconciled from the logs alone. The second is fees. The base fee is paid to the block beneficiary rather than burned, so fee flows appear as value received by validators instead of as supply leaving circulation. Arc targets the Osaka hard fork as its EVM baseline, with blob transactions unsupported and PREVRANDAO fixed at zero, which simplifies the block model relative to mainnet Ethereum.

Payments reconciliation comes first on a chain whose unit of account is the dollar: matching on-chain USDC movements, native and token, against ledgers held elsewhere, with sub-second finality meaning a settled transfer is settled. Tokenized-asset analytics is second. Circle’s launch partners include BlackRock deploying its BUIDL fund with native USDC, and DeFi venues such as Aave, Morpho and Uniswap, so holder registries, issuance and redemption flows and collateral usage are readable from decoded logs and traces together, the same way RWA tokenization work runs on other chains. Stablecoin FX and treasury flows are third, since Arc positions onchain FX between stablecoins as a core use. Comparisons against Tempo and other payment-first chains come up as teams decide where dollar settlement will live.

Tell us the delivery target, how far back you need and how fresh it has to be, and the share is scoped against that. Arc history runs from the 2026 mainnet launch, so a first delivery is a matter of enabling the surfaces you need. 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.