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

# Overview

API Co-Signer helps users automate approval and signing processes, making it ideal for workspaces with high transaction volumes or frequent activities. If you’re looking to automate transactions, it’s the perfect solution.

* Before signing a transaction, Co-Signer will callback to your business system. It can initiate the signature only after authorization is obtained; otherwise, the transaction cannot proceed.

* After the app-side signature authorization for the consolidation transaction, it will not callback to the Client system.

* [View Co-Signer Deployment Documentation](https://docs-en.keysecure.io/api-references/mpc-apis/co-signer/deploy.md)

## Creating an Address

![](https://mintcdn.com/keysecure-en/U8Qkwr5UOHzcbJEo/images/apis/1_en.png?fit=max\&auto=format\&n=U8Qkwr5UOHzcbJEo\&q=85\&s=bda3d93d5f166db55b6c35954bdb7c44)

## Automatic Signature (Callback Method)

![](https://mintcdn.com/keysecure-en/U8Qkwr5UOHzcbJEo/images/apis/2_en.png?fit=max\&auto=format\&n=U8Qkwr5UOHzcbJEo\&q=85\&s=dfa1e0ae6b512766468c5af1b9c91445)

## Automatic Signature (Signature Sign Verification Method)

![](https://mintcdn.com/keysecure-en/U8Qkwr5UOHzcbJEo/images/apis/3_en.png?fit=max\&auto=format\&n=U8Qkwr5UOHzcbJEo\&q=85\&s=d9a03134a4f2e615e1e4d10c5a1e68eb)

> [!TIP]
>
> Both callback and signature sign verification methods can coexist, but **at least one verification method is required**. Developers can choose the verification method according to their needs.


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