> ## Documentation Index
> Fetch the complete documentation index at: https://docs.intention.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Tick and Lot

> Tick size, lot size, and rounding rules for orders submitted through the Intention API.

Every market on Intention has a tick size (smallest allowed price increment) and a lot size (smallest allowed quantity increment). Orders that violate these constraints are rejected by the protocol. This page will document the API-level rules for tick and lot — how they are exposed in market metadata, how clients should round, and how rejection codes are structured.

<Note>
  Status: not yet published. The tick and lot rules described in [Precision](/trading/precision) and [Markets](/trading/markets) define the behavior; this API page will be filled in once the read endpoints exposing them are stable.
</Note>

## What this page will contain

* **Discovery.** How clients fetch tick and lot for each market via the read API.
* **Rounding rules.** Which fields round against the user, which round to nearest, and how rounding interacts with [reduce-only](/trading/reduce-only) sizing.
* **Validation.** The error codes returned when an order violates tick or lot constraints, cross-referenced with [errors](/api-reference/conventions/errors).
* **Worked examples.** Sample order sizes and prices for representative markets, showing the exact rounded values that the matching engine accepts.

See [Precision](/trading/precision) for the policy view and [Notation](/api-reference/conventions/notation) for the underlying field types. For early integration questions, email `contact@intention.xyz`.