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

# Robinhood Chain network parameters

Network parameters, supported standards and Chainlink services on Robinhood Chain (chain ID 4663), as Farlight relies on them.

{% hint style="info" %}
RPC endpoints, explorer URLs and Robinhood's own contract addresses are published by Robinhood at [docs.robinhood.com/chain](https://docs.robinhood.com/chain/). Farlight's contract addresses are recorded in `contracts/deployments/4663.json` and described on the [Building and deploying the contracts](/architecture/deployment.md) page. Verify every address against those two sources before you move funds.
{% endhint %}

## Network

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

## Chain parameters

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

## Time and calldata conventions

| Item                      | How Farlight treats it                                                                         |
| ------------------------- | ---------------------------------------------------------------------------------------------- |
| `block.timestamp`         | The clock for every time-based rule: interest accrual, expiries, grace windows, auction curves |
| `block.number`            | Never used as a clock; on Arbitrum it tracks the L1 block                                      |
| `ArbSys.arbBlockNumber()` | Only where an L2 block height is actually required, for example in event metadata              |
| Calldata compression      | Offer structs are packed and signatures compacted, because L1 data cost dominates the fee      |

## Standards in use

| Standard | Purpose in Farlight                                        |
| -------- | ---------------------------------------------------------- |
| ERC-20   | Stock Tokens (18 decimals) and USDG (6 decimals)           |
| ERC-8056 | Corporate actions on Stock Tokens through `uiMultiplier()` |
| ERC-721  | Lender slice tokens (SliceToken, symbol FSLC)              |
| EIP-712  | Signing `LendOffer` and `BorrowRequest` messages           |
| EIP-1271 | Signature verification 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 services on 4663

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


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