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

# Robinhood Chain feed

## Introduction

The service delivers Robinhood Chain sequencer transactions in real time as complete DIRECT records for latency-sensitive applications and node integrations.

## Records

The feed sends two DIRECT record types:

| Type                    | Value | Purpose                                               |
| ----------------------- | ----: | ----------------------------------------------------- |
| `DIRECT_ITEM`           |   `1` | One complete raw L2 item                              |
| `DIRECT_SEQUENCE_FINAL` |   `3` | Sequence completion and canonical reconstruction data |

Items are identified by sequence number and ordinal. Ordinals begin at zero.

## Incremental and canonical processing

`DIRECT_ITEM` may be used immediately for latency-sensitive incremental processing. A sequence is canonically complete only after its FINAL record and every ordinal from `0` through `item_count - 1` have arrived.

The FINAL record contains the metadata required to reconstruct the original canonical feed message.

## Reconnect behavior

After reconnecting, the relay starts at a fresh sequence boundary. It does not replay stale backlog. Consumers must recover any missing canonical sequences using their normal node or L1 recovery path.

## Message kinds

Do not confuse these fields:

* DIRECT record type is stored in byte `1` of the DIRECT prefix.
* Reconstruction or outer kind is stored in byte `2` of a FINAL record.
* The first byte of a raw L2 item is interpreted as an L2 kind only for an ordinary L2 message whose header kind is `3`.

Non-L2 ArbOS messages must be carried opaquely rather than rejected as unsupported L2 kinds.


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