Files and e-signing

Connect Yousign (Youtrust) to Hypamoon

Possible, with help from Yousign (Youtrust). The API is documented, but you cannot just create a key: access goes through Yousign (Youtrust) first.

Possible

The check

Three questions about the API of Yousign (Youtrust), answered from its own docs.

Public API docs: Yes. Public API v3 docs with a reference and guides. Read the docs
A key you create yourself: No. Owners and admins create keys themselves, but the free trial is sandbox only; for production you contact the sales team for a paid subscription. developers.youtrust.com
Versions or a changelog: Yes. Versioned base path (/v3) and a published changelog. developers.youtrust.com
How it signs in: An API key from the API keys page, sent as a bearer token.
Webhooks: Yes. It can tell your app when something changes. developers.youtrust.com
Hosting: Cloud
Condition: A paid API subscription for production; the trial gives sandbox access only.

Your own signing flow on Yousign, from your own forms and screens.

Signature requests, signers and signed documents through the API.
AI that prepares the document details and reminds you of signatures that stall.
A screen for your team and an email when a contract is signed.

Ask your chat

Answers straight from your Yousign (Youtrust) data, in Claude or another chat with the full Hypamoon connection.

Which contracts sent this week are still waiting for a signature?
Who has not signed the new terms yet?

When something happens

Yousign (Youtrust) sends a webhook to your app, and the app asks AI what happens next.

When
A signature request is completed.

AI decides
AI reads the signed document and pulls out the key dates and amounts.

Then
The owner gets an email with a short summary and the signed file.

A screen for your team or customers

An app on your own address, with sign-in, on top of the same Yousign (Youtrust) data.

For your team
A screen with open signature requests and who still needs to sign.

Yousign (Youtrust) stays the core: your chat builds the rest on its API, as an adapter plus an app and agents in your Hypamoon project. Reading starts after you click Allow in the portal. Every change an agent or a chat makes in Yousign (Youtrust) waits for your approval, one call at a time. How adapters work

Good to know

Your adapter uses a fixed key: you paste it once in the Hypamoon portal, never in the chat, and it only goes to the API host you allow.
Yousign now presents itself as Youtrust; the API hosts are api.yousign.app and api-sandbox.yousign.app.

Try it in your chat

First get access from Yousign (Youtrust). Then fill in what to read and write, and send it.

Say this in your chat

Build the Hypamoon recipe build-an-adapter for Yousign (Youtrust). API docs: https://developers.youtrust.com/. Read: [what]. Write: [what, or nothing].

Open in Claude

In Claude, or another chat with the full Hypamoon connection; adapters are not in ChatGPT yet. You paste the key in the portal, never in the chat. The full recipe

Sources

Checked on 7 November 2026.

Yousign (Youtrust) is a name of its owner, used here only to describe the software. This page is not an official integration and Hypamoon has no partnership with Yousign (Youtrust). Found something that changed? Tell us at support.

Tool not listed? Ask the chat to check its API.

The same three checks work for any software. Your chat reads the vendor's own docs and tells you what it found.

Say this in your chat

Check if [software] has an open API that a Hypamoon adapter can use: public API docs, a key or token I can create myself without asking the vendor, and versions or a changelog. Link the pages you used.

Open in Claude Open in ChatGPT

Fill in the name of your software. Checking needs no connection to Hypamoon.

Ready to connect Yousign (Youtrust)?

Connect your chat once, then ask it to build the adapter.

Start free

Works in Claude, ChatGPT and Copilot. Add to Claude Add to ChatGPT Add to Copilot

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