#layer-2

Live on-chain data for Mantle (chain-id 5000), a modular EVM Layer 2 with the MNT native gas token. Read the chain status — chain id, latest block number, current gas price, node client version and sync state — fetch any block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and limit, base fee and proposer, read the current gas price and max priority fee in both wei and gwei, and look up any account address for its MNT balance (in wei and whole MNT) and transaction nonce. Addresses use the standard 0x EVM hex form. A short protective cache keeps responses fast while staying within a few seconds of the chain. Distinct from other Layer-1, Layer-2 and Cosmos-chain APIs on the marketplace: this surfaces the Mantle network specifically.

api.oanor.com/mantle-api

Live on-chain data for Fraxtal (chain-id 252), an Optimistic-rollup EVM Layer 2 from Frax Finance that uses frxETH (Frax Ether) as its gas token. Read the chain status — chain id, latest block number, current gas price, node client version and sync state — fetch any block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and limit, base fee and proposer, read the current gas price and max priority fee in both wei and gwei, and look up any account address for its frxETH balance (in wei and whole frxETH) and transaction nonce. Addresses use the standard 0x EVM hex form. A short protective cache keeps responses fast while staying within a few seconds of the chain. Distinct from the Frax Finance protocol pools/yields feed and from other Layer-1, Layer-2 and Cosmos-chain APIs on the marketplace: this surfaces the Fraxtal chain itself.

api.oanor.com/fraxtal-api

Live on-chain data for Abstract (chain-id 2741), a consumer-focused ZK Stack Layer 2 (zkSync-based) that settles to Ethereum and uses ETH for gas. Read the chain status — chain id, latest block number, current gas price, node client version and sync state — fetch any block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and limit, base fee and proposer, read the current gas price and max priority fee in both wei and gwei, and look up any account address for its ETH balance (in wei and whole ETH) and transaction nonce. Addresses use the standard 0x EVM hex form. A short protective cache keeps responses fast while staying within a few seconds of the chain. Distinct from other Layer-1, Layer-2 and Cosmos-chain APIs on the marketplace: this surfaces the Abstract ZK network specifically.

api.oanor.com/abstract-api

Live on-chain data for Linea (chain-id 59144), a Consensys zkEVM Layer 2 that settles to Ethereum and uses ETH for gas. Read the chain status — chain id, latest block number, current gas price, node client version and sync state — fetch any block by number (or the latest) with its hash, parent hash, timestamp, transaction count, gas used and limit, base fee and proposer, read the current gas price and max priority fee in both wei and gwei, and look up any account address for its ETH balance (in wei and whole ETH) and transaction nonce. Addresses use the standard 0x EVM hex form. A short protective cache keeps responses fast while staying within a few seconds of the chain. Distinct from other Layer-1, Layer-2 and Cosmos-chain APIs on the marketplace: this surfaces the Linea zkEVM network specifically.

api.oanor.com/linea-api

Live on-chain data for Movement Network (chain-id 126), a Move-based Layer 2 with an Aptos-compatible REST interface and the MOVE token. Read the ledger status — chain id, current epoch, ledger version, block height, ledger timestamp and node role — fetch any block by height (or the latest) with its hash, timestamp and first and last transaction versions, stream the most recent transactions with their version, hash, type, success flag, sender, gas used and VM status, and look up any account with its sequence number, authentication key and on-chain resource count. Addresses use the standard 0x hex form (for example 0x1, the Move framework account). A short protective cache keeps responses fast while staying within a few seconds of the chain. Distinct from other Layer-1 and Cosmos-chain APIs on the marketplace: this surfaces the Movement Network Move L2 specifically.

api.oanor.com/movement-api

The Tezos Layer-2 smart-rollup layer, live from the public TzKT indexer — no key, nothing cached. Smart rollups are Tezos's enshrined Layer-2: optimistic rollups — including Etherlink, the EVM-compatible L2 — that post state commitments back to Tezos and are secured by on-chain refutation games. The existing Tezos readers cover the base chain, the bakers and governance, but not the rollup layer; this opens it. List the smart rollups ranked by inbox level, each with its address, name, PVM kind (wasm), staker counts and commitment tallies. Look up a single rollup by address in full, with its cemented, pending and refuted commitments and refutation-game activity. And read the recent rollup commitments — the periodic state attestations — with their committed state hash, inbox level, tick count and how many stakers backed each. The Layer-2 layer for Tezos wallets, rollup operators, Etherlink users and analytics. Live from api.tzkt.io.

api.oanor.com/tezosrollups-api

Where dollar stablecoin liquidity actually lives, read live and keyless from each blockchain. USDC and USDT are issued natively on many chains, and the split between them is one of the most-watched signals in the layer-2 wars: Ethereum mainnet still holds the bulk, but Base, Arbitrum and the other rollups have been pulling stablecoin supply across as activity migrates. This API reads the native USDC and USDT supply directly from the token contract on each chain — Ethereum, Base, Arbitrum, Optimism, Polygon and Avalanche — not a single chain and not an aggregator, so you see the real on-chain distribution. The stablecoin endpoint takes a symbol (USDC or USDT) and returns its supply on every tracked chain, ranked, each with its share of that stablecoin and the Ethereum-versus-rollup split. The chains endpoint ranks the chains by their total native stablecoin liquidity (USDC and USDT together) — which chain hosts the most dollars. The summary endpoint is the top-down view: total USDC, total USDT, the combined total, the USDT-to-USDC ratio, and Ethereum's dominance versus the share that has moved to the rollups. Because USDC and USDT are dollar-pegged and read at the token's own on-chain decimals (read live from each contract, never assumed), the supply equals the dollars of stablecoin on that chain; only natively-issued supply is counted (bridged and peg tokens are excluded). This is the stablecoin chain-distribution cut — distinct from the single-chain token feeds, the generic stablecoin-supply aggregators and the price feeds: it is specifically the cross-chain liquidity map. Amounts are in US dollars. No key, nothing stored beyond a short cache.

api.oanor.com/stablecoinchains-api

What it actually costs a user to transact on each Ethereum layer-2 rollup, live and keyless, powered by the public growthepie dataset. Ethereum's base layer is expensive, so most activity has moved to rollups — Arbitrum, Base, OP Mainnet, zkSync Era, Linea, Scroll, Starknet, Mantle, Mode, Metis, Celo, Taiko, Unichain — but the cost of a transaction varies a lot between them, and that is the number a user choosing a chain, or a developer deciding where to deploy, actually wants. This answers "which L2 is cheapest to use right now", in plain dollars. The chains endpoint is the league table: every tracked rollup ranked from cheapest, each with its median transaction cost (USD and ETH), native-transfer cost, token-swap cost, average cost and throughput (transactions per second and Mgas/s); Ethereum L1 is included as the baseline so you can see the L2 saving. The chain endpoint returns one rollup's full current cost-and-performance detail plus a short recent history of its median cost. The cheapest endpoint cuts to the chase — the single cheapest rollup right now for a simple transfer and for a token swap, and how much cheaper that is than Ethereum L1. Because the upstream rounds USD to four decimals (so ultra-cheap rollups would read $0.00), the dollar figures are recovered precisely from each chain's exact ETH cost and the ETH price implied by the same payload — no second data source. This is the L2 user-transaction-cost cut — distinct from the L2 economic-activity feed (active addresses, transaction count, rollup revenue and profit: what the chains earn, not what they cost you), from the multi-chain gas-oracle (gas tiers in gwei) and from the blob data-availability fee market (the L1 cost rollups pay to post data). Costs in USD and ETH, throughput in TPS and Mgas/s, no key, nothing stored.

api.oanor.com/l2fees-api

The Ethereum blob data-availability fee market that every layer-2 rollup lives and dies by, live from the public Blobscan dataset, no key. Since the Dencun upgrade (EIP-4844, proto-danksharding) rollups no longer post their compressed transaction data as expensive calldata — they post it as blobs, large temporary data packets priced in their own independent fee market (the blob-gas market, with its own base fee that rises when blocks are full of blobs and falls when they are not). Blob space is now the single biggest cost line for almost every rollup, so the blob base fee and how much blob space each rollup consumes is the core economics of the entire layer-2 ecosystem — when blob demand spikes, every rollup's costs (and ultimately its user fees) rise together. The network endpoint returns the live state of the blob fee market: the current blob base fee, the average over recent blocks, the average blobs per block against the protocol target and maximum, the resulting utilisation, the excess blob gas that drives the fee, and the data-availability fee burned per block. The rollups endpoint is the key view — it ranks the layer-2 rollups by how much blob space they are consuming right now (Base, Arbitrum, Optimism, World, Taiko and the rest), each with its blob count, blob gas used, share of all blob space and the data-availability fee it is paying in ETH. The blocks endpoint lists the most recent blocks with their blob count, blob base fee and DA fee. This is the blob / data-availability fee-market cut — distinct from the multi-chain execution-gas oracle (the EIP-1559 execution-gas market, not the separate blob-gas market), the ETH supply/burn feed (which reports a single blob-base-fee number but not blob-space utilisation or which rollups consume it), and the on-chain and TVL feeds. Fees are in gwei and ETH; figures are live, per block.

api.oanor.com/blobspace-api

Live economic-activity metrics for Ethereum Layer-2 rollups — Arbitrum, Base, Optimism, zkSync, Linea, Scroll, Polygon and more — powered by the public growthepie.xyz feed, no key, nothing stored. This is the L2 fundamentals cut: not a single chain's block or gas data, but how much each rollup is actually used and what it earns. The chains endpoint lists the tracked rollups. The chain endpoint returns one rollup's latest metrics: daily active addresses, transaction count, fees paid, on-chain profit (the fees it keeps after paying Ethereum to post its data), median transaction cost, stablecoin supply, total value locked, market cap and fully-diluted valuation. The metric endpoint ranks every rollup by a single metric, so you can see at a glance which L2 leads on users, fees or profit and how the scaling race is shifting. Track the real adoption and economics of the rollup ecosystem as live JSON. This is the L2 activity / economics cut — distinct from the per-chain on-chain (block and gas) APIs and the TVL-only APIs in the catalogue.

api.oanor.com/growthepie-api

Live zkSync Era on-chain data as an API, built on the open Blockscout explorer. zkSync Era (chain id 324) is a leading Ethereum zk-rollup Layer-2 by Matter Labs; its native currency is ETH and fees are a fraction of mainnet. Pull network stats (total blocks and transactions, ETH price, live gas), a gas oracle with slow, average and fast prices in gwei, the most recent blocks and full block detail by height or hash. Look up any address for its balance and contract status, any transaction by hash for its value, fee, status, sender and receiver, and any ERC-20 token by contract for its name, symbol, decimals, holders and USD rate. A universal search resolves addresses, tokens, blocks and transactions in one call. Real on-chain data, no key needed upstream. Ideal for zkSync wallets, block explorers, gas trackers, DeFi dashboards and on-chain analytics.

api.oanor.com/zksync-api

Live Arbitrum One on-chain data as an API, built on the open Blockscout explorer. Arbitrum is the largest Ethereum Layer-2 by total value locked (chain id 42161); gas and balances are denominated in ETH and fees are a fraction of mainnet. Pull network stats (total blocks and transactions, ETH price, live gas), a gas oracle with slow, average and fast prices in gwei, the most recent blocks and full block detail by height or hash. Look up any address for its ETH balance and contract status, any transaction by hash for its value, fee, status, sender and receiver, and any ERC-20 token by contract for its name, symbol, decimals, holders and USD rate. A universal search resolves addresses, tokens, blocks and transactions in one call. Real on-chain data, no key needed upstream. Ideal for Arbitrum wallets, block explorers, gas trackers, DeFi dashboards and on-chain analytics.

api.oanor.com/arbitrum-api

Live Base mainnet on-chain data as an API, built on the open Blockscout explorer. Base is Coinbase's Ethereum Layer-2 (chain id 8453), where gas and balances are denominated in ETH and fees are a fraction of mainnet. Pull network stats (total blocks and transactions, ETH price, live gas), a gas oracle with slow, average and fast prices in gwei, the most recent blocks and full block detail by height or hash. Look up any address for its ETH balance and contract status, any transaction by hash for its value, fee, status, sender and receiver, and any ERC-20 token by contract for its name, symbol, decimals, holders and USD rate. Real on-chain data, no key needed upstream. Ideal for Base wallets, block explorers, gas trackers, DeFi and on-chain analytics.

api.oanor.com/base-api