> For the complete documentation index, see [llms.txt](https://docs.useicaria.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.useicaria.xyz/robinhood-chain/network-details.md).

# Network details

Robinhood Chain, as reference material.

{% hint style="info" %}
RPC endpoints, explorer URLs and Robinhood's own contract addresses are published at [docs.robinhood.com/chain](https://docs.robinhood.com/chain/). Addresses for Icaria sit in `contracts/deployments/4663.json` and are covered on the [Deployment](/architecture/deployment.md) page. Check any address against those sources before you send anything anywhere.
{% endhint %}

## Network

| Network         | Chain ID | Status                    | Icaria                |
| --------------- | -------- | ------------------------- | --------------------- |
| Robinhood Chain | 4663     | Mainnet since 1 July 2026 | Production deployment |

## Chain parameters

| Parameter               | Value                                                                                |
| ----------------------- | ------------------------------------------------------------------------------------ |
| Execution               | Arbitrum Nitro, EVM-equivalent, on ArbOS 40 with EIP-7702 support                    |
| Settlement layer        | Ethereum                                                                             |
| Data availability       | Ethereum blobs, in rollup mode                                                       |
| Block time              | Roughly 250 ms                                                                       |
| Preconfirmation latency | Roughly 100 ms                                                                       |
| Gas token               | ETH                                                                                  |
| Median transaction cost | Roughly $0.001                                                                       |
| Canonical withdrawal    | 7 days                                                                               |
| Sequencer               | A single sequencer operated by Robinhood, applying sanctions screening at that point |
| Forced inclusion        | Through the L1 delayed inbox, after 24 hours                                         |
| Explorer                | Blockscout                                                                           |

## Precompiles and conventions Icaria relies on

| Item                      | Usage                                                                                        |
| ------------------------- | -------------------------------------------------------------------------------------------- |
| `block.timestamp`         | Anything involving time: quote expiries, staleness bounds, grace periods and the timelock    |
| `block.number`            | Never used as a clock, since Arbitrum derives it from the L1 block                           |
| `ArbSys.arbBlockNumber()` | Reserved for the rare case where an actual L2 block height is wanted, such as event metadata |
| Compressed calldata       | With L1 data cost dominating fees, RFQ quote structs get packed and signatures compacted     |

## Standards in use

| Standard | Where                                                                        |
| -------- | ---------------------------------------------------------------------------- |
| ERC-20   | Stock Tokens at 18 decimals, USDG at 6                                       |
| ERC-8056 | Corporate actions on Stock Tokens, through `uiMultiplier()`                  |
| ERC-4626 | Vault share accounting, extended to cover dual assets and in-kind withdrawal |
| EIP-712  | The signing of RFQ quotes                                                    |
| EIP-1271 | Checking maker signatures that come from smart accounts                      |
| ERC-4337 | Account abstraction entry points, versions 0.6 through 0.8                   |
| EIP-7702 | Delegating an EOA to smart-account code                                      |
| Permit2  | Allowance-based pulls at settlement, for makers and takers alike             |
| EAS      | Where eligibility attestations live                                          |

## What Chainlink runs on chain 4663

| Service                    | Purpose in Icaria                              |
| -------------------------- | ---------------------------------------------- |
| Data Feeds (24/5 equities) | The mid behind vault quoting and band checks   |
| Data Streams (v11 RWA)     | Session classification and fill cross-checks   |
| Sequencer Uptime Feed      | The grace period after an outage               |
| CCIP                       | Bridging treasuries and gold, once they are on |
| ACE / CCID                 | A second option for the eligibility adapter    |


---

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