Robinhood Chain went live in July 2026 as an Arbitrum Orbit Layer 2 for 24/7 tokenized stock trading — chain ID 4663, a new block roughly every tenth of a second. Here are the APIs developers are using to build on it.1. BitqueryBitquery indexes and decodes Robinhood Chain activity: tokenized stock transfers, holders and USD valuations (NVDA, AAPL, GOOG and more), DEX swaps with OHLCV candles and per-wallet trade history, wallet balances, decoded contract events/traces, and cross-chain bridge flows. It’s available as GraphQL (~1s), WebSocket (sub-second), Kafka (