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

# Robinhood Chain reference

{% hint style="info" %}
Robinhood publishes its RPC endpoints, explorer URLs and its own contract addresses at [docs.robinhood.com/chain](https://docs.robinhood.com/chain/). The Ethosis contract addresses live in `contracts/deployments/4663.json` and are explained on the [Deployment](/architecture/deployment.md) page. Check any address against those sources before moving funds.
{% endhint %}

## The network

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

## Core parameters

| Parameter                   | Value                                                                          |
| --------------------------- | ------------------------------------------------------------------------------ |
| Execution environment       | Arbitrum Nitro, EVM-equivalent, ArbOS 40 (supports EIP-7702)                   |
| Settles to                  | Ethereum                                                                       |
| Data availability           | Ethereum blobs, rollup mode                                                    |
| Block interval              | Roughly 250 ms                                                                 |
| Preconfirmation latency     | Roughly 100 ms                                                                 |
| Gas currency                | ETH                                                                            |
| Median transaction fee      | Roughly $0.001                                                                 |
| Canonical withdrawal period | 7 days                                                                         |
| Sequencer                   | A single sequencer run by Robinhood, with sanctions screening at the sequencer |
| Forced inclusion            | Through the L1 delayed inbox after a 24-hour delay                             |
| Block explorer              | Blockscout                                                                     |

## How Ethosis reads time and packs data

| Item                      | How Ethosis uses it                                                                                 |
| ------------------------- | --------------------------------------------------------------------------------------------------- |
| `block.timestamp`         | Every time-dependent rule: interest accrual, expiries, grace windows, auction curves                |
| `block.number`            | Never treated as a clock; on Arbitrum it mirrors the L1 block                                       |
| `ArbSys.arbBlockNumber()` | Only when an L2 block height is genuinely needed, such as in event metadata                         |
| Calldata compression      | Offer structs are packed and signatures compacted, since L1 data cost is the dominant fee component |

## Standards

| Standard | Used for                                               |
| -------- | ------------------------------------------------------ |
| ERC-20   | Stock Tokens (18 decimals) and USDG (6 decimals)       |
| ERC-8056 | Corporate actions on Stock Tokens via `uiMultiplier()` |
| ERC-721  | Lender slice tokens (SliceToken, symbol ESLC)          |
| EIP-712  | Signing `LendOffer` and `BorrowRequest` messages       |
| EIP-1271 | Signature checks for smart accounts                    |
| ERC-4337 | Account abstraction, EntryPoints v0.6 to v0.8          |
| EIP-7702 | Delegating an EOA to smart-account code                |
| Permit2  | Allowance-based transfers at origination               |
| EAS      | Eligibility attestations                               |

## Chainlink on chain 4663

| Service                    | Role in Ethosis                            |
| -------------------------- | ------------------------------------------ |
| Data Feeds (24/5 equities) | Pricing for health factors and origination |
| Data Streams (v11 RWA)     | Auction pricing, including market status   |
| Sequencer Uptime Feed      | Liquidation grace after an outage          |
| CCIP                       | Bridged collateral (roadmap)               |
| ACE / CCID                 | Alternative adapter for eligibility        |


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.ethosis.org/robinhood-chain/network-details.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.