---
title: "tool si.read.speed_to_lead"
description: "Reads the delay from delivery to the first touch for one brand, over a window: The answer gives the measure's readings, with the population each was read over."
section: reference
address: /reference/tools/si-read-speed_to_lead
contract: 0476e35e6e275db5
---

# tool si.read.speed_to_lead

Reads the delay from delivery to the first touch for one brand, over a window: The answer gives the measure's readings, with the population each was read over.

[figure: Over MCP, si.read.speed_to_lead takes SpeedToLeadInput and returns a card whose body is SpeedToLead.]

The answer gives the measure's readings, with the population each was read over. The call needs the read grant at the brand rung.



| | |
|---|---|
| input | [SpeedToLeadInput](/concepts/speedtoleadinput) |
| result | a card whose body is [SpeedToLead](/concepts/speedtolead) |
| read-only | yes |
| destructive | no |
| card address | `ui://scale-intelligence/cards/SpeedToLead` |
| HTTP route | [`/v1/read/speed_to_lead`](/reference/read/speed_to_lead) |





| field | type | required | note |
|---|---|---|---|
| `brand` | `id` | yes |  |
| `window` | [Window](/concepts/window) | yes |  |