> For the complete documentation index, see [llms.txt](https://docs.gravityblocks.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.gravityblocks.xyz/marketplace/gbx-gravity-block-exchange.md).

# GBX: Gravity Block Exchange

Gravity is the aggregation layer that connects validators to a competitive builder market and coordinates competition amongst block builders.

## Participants <a href="#participants" id="participants"></a>

**Validators supply blockspace.** During a leader slot, the validator executes the sequencing selected through Gravity and receives the fees, tips, and other rewards generated by the resulting block.

**Users, applications, traders, and searchers create demand** with different requirements around inclusion, latency, ordering, atomicity, and execution state.

**Builders compete to allocate blockspace.** Each builder independently evaluates available transactions and bundles, resolves conflicts and dependencies, and proposes an executable sequence.

**Gravity operates the marketplace.** It distributes transaction flow, runs the auction across competing block builders, and sends the selected sequencing to the validator.

## Features

**Configurable scheduling:** Builders determine transaction sequencing, while validators can set key parameters and constraints that shape how their blockspace is allocated, including support for SFDP-compliant scheduling.

**Custom screening:** Validators can define which flow is eligible for their slots, including screening policies that support institutional or OFAC-related compliance requirements.

**Scheduling extensions:** Features such as ACE can be integrated into the marketplace and supported directly by builders. This allows new ordering, atomicity, and execution guarantees to be introduced without waiting for validator client releases.

**Observability and reporting:** Gravity collects detailed marketplace and execution telemetry. Validators receive dashboards for monitoring performance and operational health, alongside reporting that can support ETF requirements and detailed breakdowns for DATs.


---

# 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.gravityblocks.xyz/marketplace/gbx-gravity-block-exchange.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.