Event-driven channels

Arbitrum

Arbitrum is the Ethereum Layer 2 rollup ecosystem from Offchain Labs. It includes Arbitrum One (general-purpose rollup secured by Ethereum), Arbitrum Nova (AnyTrust chain for high-throughput, low-cost apps), Arbitrum Sepolia (testnet), and Arbitrum Orbit (settlement framework for custom L2 / L3 chai

7 channels across 1 AsyncAPI spec · Provider profile

Channels

/feed/arb1

Nitro Sequencer broadcast feed for Arbitrum One. The connection is a raw WebSocket; each text frame is a JSON `BroadcastMessage`.

Arbitrum Public WebSocket APIs
/feed/nova

Nitro Sequencer broadcast feed for Arbitrum Nova.

Arbitrum Public WebSocket APIs
/feed/sepolia

Nitro Sequencer broadcast feed for Arbitrum Sepolia testnet.

Arbitrum Public WebSocket APIs
eth_subscribe/logs

`eth_subscribe("logs", {address, topics})` on a Nitro JSON-RPC WebSocket. Emits a notification for each log matching the supplied address/topics filter.

Arbitrum Public WebSocket APIs
eth_subscribe/newHeads

`eth_subscribe("newHeads")` on a Nitro JSON-RPC WebSocket. Emits a notification for every new L2 head produced by the Sequencer. Blocks include Arbitrum-specific fields (`l1BlockNumber`, `sendRoot`, `

Arbitrum Public WebSocket APIs
eth_subscribe/newPendingTransactions

`eth_subscribe("newPendingTransactions")`. Accepted by Nitro for go-ethereum compatibility, but Arbitrum's centralized Sequencer orders transactions on receipt — there is no public mempool, so the str

Arbitrum Public WebSocket APIs
eth_subscribe/syncing

`eth_subscribe("syncing")`. Accepted by Nitro for go-ethereum compatibility. Notifications reflect the local node's sync status.

Arbitrum Public WebSocket APIs