Portant for AI agents

Get documents signed from your AI assistant

Connect Portant to ChatGPT, Claude, Claude Code or Cursor. Ask your assistant to send a document for signature. Portant emails the signer a private link, and you get the signed PDF back.

Connect your assistant Get an API key

Free for 30 documents a month. No credit card.

How it works

You ask. A person signs. The signed copy comes back.

Ask your assistant

Say who must sign and what. The assistant can send a PDF, a Google Doc link, or a document it writes for you, such as an NDA or a short agreement.

The signer signs in a browser

Portant emails the signer a private link. They read the document and sign it on any device, with no account and nothing to install.

You get the signed PDF

Portant emails you the signed PDF with a signing certificate page. Your assistant can also check the status and give you a link to the file.

Your assistant never signs for anyone. Every signature comes from a person, in a browser. If you sign too, you sign first, and then Portant sends the document to the other person.

Before and after you send

Change anything before it sends, then get every signature

Change it before it sends

Nothing goes to the signer until you click Send. Ask your assistant to rename the document, add or remove a signer, change the order, edit the text or move a signature box, and the preview in your chat shows the change.

Several signers, in order

Add up to five signers. Portant emails each person when the one before has signed, and the card in your chat shows who has signed, who is signing now and who is waiting. Everyone gets the signed PDF at the end.

Several signers are on the Plus and Scale plans.

Set up

Connect Portant in a minute

Portant is a remote MCP server. Add this URL to any assistant that supports MCP, then sign in with your email address. Portant sends you a one-time code; there is no password.

https://mcp.portant.co/mcp

Claude

In Claude on the web or the desktop app, open Settings, then Connectors.
Click Add custom connector. Enter the name Portant and the URL above.
Click Connect, sign in with your email, and allow access.

On a Team or Enterprise plan, an owner adds the connector for the organization first.

ChatGPT

Portant is not in the ChatGPT app directory yet. When it is listed, you can connect it from Apps in ChatGPT settings, and sign in with your email.

Until then, you can add the URL above as a custom app in ChatGPT developer mode, if your plan includes it.

Claude Code

Add the server, then run /mcp in Claude Code and choose Authenticate to sign in:

claude mcp add --transport http portant https://mcp.portant.co/mcp

Or use an API key from mcp.portant.co/keys:

claude mcp add --transport http portant https://mcp.portant.co/mcp --header "Authorization: Bearer YOUR_API_KEY"

Cursor and other MCP clients

Add Portant to your MCP configuration file (for Cursor, ~/.cursor/mcp.json). Clients that support OAuth can leave out the header and sign in instead.

{
  "mcpServers": {
    "portant": {
      "url": "https://mcp.portant.co/mcp",
      "headers": { "Authorization": "Bearer YOUR_API_KEY" }
    }
  }
}

Try it with no account

Use this URL to send a document with no sign-in. Before anything goes to the signer, Portant emails you to review the document and confirm. After you confirm, Portant makes your free account.

https://mcp.portant.co/open/mcp

What you can ask

Things to try

“Send this NDA to ana@example.com to sign.”

“Write a one-page freelance agreement for my project with Sam Lee, and get us both to sign it.”

“Get this Google Doc signed by our new contractor, in Spanish.”

“Has Ana signed yet? Download the signed copy.”

The tools your assistant gets

Send a document for signature. From markdown text, a PDF, or a Google Doc shared with anyone who has the link. You can ask to see the finished document before it goes out. On the Plus and Scale plans, up to five people can sign in a set order.
Check signature status. Waiting for you, waiting for the signer, signed, cancelled or expired.
Find a signature request. By the signer’s email or the document title, for example in a new chat.
Remind the signer. Portant emails the same signing link again, up to 3 times, on the Plus and Scale plans.
Send a saved template. Save a document you send often, then send it again to a new signer from any chat, and rename or change it later, on the Plus and Scale plans.
Get the signed PDF. A private link to open and download it, with the signing certificate page.
Get a PDF upload URL. For large files, from tools that can run commands.
Cancel a signature request. The signing link stops working.

Privacy and security

What Portant does with your document

Portant reads the document once, in memory, to make the PDF. It then encrypts the PDF, and stores only the encrypted file.
The key that opens the document is in the private signing link, not on our servers. Your assistant keeps a copy of it to download the signed PDF.
If you save a document as a template, Portant keeps it encrypted with its own key, so that it can be sent again from any chat. You can delete it at any time. For a Google Doc, Portant keeps only its link, and each send uses the Doc as it is then.
Signing links stop working after 14 days, and Portant deletes the stored files automatically. On Plus and Scale, Portant stores each signed PDF until you delete it, so you can download it from your account page. That copy is encrypted with Portant’s own key, so Portant can open it.
Portant does not use your documents to train AI models.
Your assistant cannot sign for anyone, and it cannot see other people’s documents.

Read the privacy notice for this service.

Free plan

30 documents a month, free

Up to 30 documents a month and 10 a day.
One signer, and you can sign too.
PDFs up to 5 MB and 50 pages.
Emails and signing pages in English, Spanish, German, French, Japanese, Italian, Dutch and Brazilian Portuguese.
A signing certificate page on every signed PDF, with each person’s name, email, IP address and the time they signed.

For developers

The same tools as a REST API

Send Authorization: Bearer YOUR_API_KEY with each request. With no key, a request needs sender.email, and Portant emails the sender to confirm first. The full reference is in the OpenAPI file.

POST https://mcp.portant.co/v1/requests
{
  "title": "Mutual NDA",
  "document": { "markdown": "# Mutual NDA\n\n...\n\n{{signature:signer}}" },
  "signer": { "name": "Ana Ruiz", "email": "ana@example.com" },
  "language": "en"
}

GET  https://mcp.portant.co/v1/requests/{request_id}
GET  https://mcp.portant.co/v1/requests/{request_id}/signed-pdf
POST https://mcp.portant.co/v1/requests/{request_id}/cancel
POST https://mcp.portant.co/v1/requests/{request_id}/remind
POST https://mcp.portant.co/v1/uploads
GET  https://mcp.portant.co/v1/templates
PATCH https://mcp.portant.co/v1/templates/{template_id}
PUT  https://mcp.portant.co/v1/webhook

A document is one of markdown, pdf_url, pdf_base64, google_doc_url, upload_id or template_id. Keep the request_token from the answer, and send it as the X-Request-Token header to check, download, remind or cancel. It is the only way to download the signed PDF. For a large PDF, get an upload URL first and PUT the file to it. On Plus and Scale, PUT /v1/webhook sets a URL that gets a signed event when a document is signed. On Plus and Scale, save_as_template: true also saves the document as a template, GET /v1/templates lists the saved ones, and PATCH /v1/templates/{template_id} changes one. For up to five people who sign in order (Plus and Scale), send signers, a list, instead of signer.

Frequently asked questions

Is a signature made this way legally valid?

Under the ESIGN Act and UETA in the US and eIDAS in the EU, a signature cannot be refused legal effect only because it is electronic. Portant signatures are simple electronic signatures (SES), which cover most business agreements. Some documents, such as wills or certain court and family law documents, still need a handwritten or qualified signature.

Can my assistant sign for me?

No. No tool can sign. When you must sign too, Portant emails you a link first, you sign in your browser, and then Portant sends the document to the other person.

Does the signer need a Portant account?

No. The signer opens the private link from the email, types their name and email address, and signs in the browser. The email comes from Portant, and replies go to you.

Where do the signature fields go?

When your assistant writes the document, it puts the signature and date fields where they belong. For a PDF or a Google Doc, it can give the field positions. If it gives none, Portant looks for the signature lines in the document and puts the fields there. When it cannot tell whose line is whose, it adds a signature page at the end.

Is this the same as the Portant app?

No. This is a separate service for one-off documents from your assistant, with its own sign-in and its own free plan. To make documents from HubSpot, Google Sheets or Google Forms and send them for signature automatically, use the Portant app.