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Arbitrum One · Nitro · JSON-RPC · WebSocket

Arbitrum RPC endpoint with trace and debug where the chain allows

We expose Nitro’s debug and txpool namespaces today — unlike many hosts that drop trace entirely. A pruned node means reliable trace on recent windows; deep history waits on our Erigon Nitro archive rollout.

Get API key Documentation Pricing
HTTPS host arb.etox.io
Authentication API key as first path segment · /ws/ for WebSocket
Stack Nitro (pruned) · Erigon Nitro archive roadmap

Debug & txpool today

Nitro namespaces exposed where supported — validate depth in staging; hot-data trace before full archive lands.

Erigon Nitro archive path

Planned migration to archive layout so debug_traceTransaction behaves across history like our Ethereum Reth stack.

Gateway & CU clarity

Per-key limits and Arbitrum methods like arb_getL1BlockNumber in /docs.

Roadmap: Erigon Nitro archive on mainnet

When Erigon Nitro for Arbitrum One reaches production stability (expected in the 2026 window per ecosystem releases), etox plans to migrate from pruned Nitro to an archive layout so debug_traceTransaction and friends behave across full history — matching what we already deliver on Ethereum via Reth. Until then, treat Arbitrum trace as “hot data” friendly and validate block depth in staging.

Endpoint: arb.etox.io

Authenticated requests use the same API-key-first path pattern as Ethereum. WebSocket RPC is available under the /ws/ prefix for subscriptions that Nitro supports. Rate limits and CU weights are enforced per key at the gateway, with Arbitrum-specific methods such as arb_getL1BlockNumber listed in our documentation.

Why Arbitrum teams evaluate etox

  • Transparent bare-metal footprint instead of anonymous shared pools
  • Aligned Pro pricing ($49/mo) with published CU tables
  • Honest comparison vs providers that omit Arbitrum trace — see vs Competitor 1

Related chains

Pair Arbitrum with our Ethereum archive RPC for L1 anchor reads, add Base for OP Stack traffic on the same gateway pattern, and watch Polygon as we bring that endpoint online behind the same control plane.