APISign

Send documents out for legally binding e-signature, and manage the templates they come from, directly from an agent.

CommunityOnlineAPI key requiredGlobalFreeCan modify data

What it can do

  • Template List: List all templates in the organization. Returns template IDs, names, and timestamps.
  • Template Get: Get a specific template by ID, including its content and field definitions.
  • Template Create: Create a new blank template with a name and optional markdown content.

What data it sees

Do you need an account

An API key from the service settings is required

Send documents out for legally binding e-signature, and manage the templates they come from, directly from an agent.

Build a contract from a reusable Markdown template with Handlebars variables, fill them in, send it to signers, and track viewing and signing through to completion. Twelve tools across templates and contracts.

Get an API key at apisign.io under Account > API Keys. A Read Only key exposes only the lookup tools and cannot create or send anything; a Read & Write key exposes all twelve. Contracts are billed per document sent.

How to connect

How to connect APISign to Claude

The server address to paste into Claude settings:

https://apisign--apisign.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect APISign to ChatGPT

The server address to paste into ChatGPT settings:

https://apisign--apisign.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect APISign to Cursor

The server address to paste into Cursor settings:

https://apisign--apisign.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (12)

Raw names from tools/list. Only developers need these.

template_listList all templates in the organization. Returns template IDs, names, and timestamps.
template_getGet a specific template by ID, including its content and field definitions.
template_createCreate a new blank template with a name and optional markdown content.
template_updateUpdate an existing template's name, content, or field definitions.
template_uploadUpload and convert a DOCX/DOC file to a template. File must be base64 encoded.
template_archiveSoft delete a template by marking it as archived.
contract_listList all contracts in the organization with their status.
contract_getGet a specific contract by ID, including signers and their status.
contract_createCreate a new contract from a template or with custom content. Requires at least one signer. The content must contain at least one signature placeholder (for example {{signature}}); with more than one signer, give each signer their own signature placeholder and assign it via signer_fields (for example {{signature_buyer}} and {{signature_seller}}).
contract_updateUpdate a draft contract's details or signers. Only draft contracts can be updated.
contract_sendSend a contract to signers for signing. Charges the organization's balance and sends email notifications.
contract_cancelCancel a draft or sent contract. Only draft and sent contracts can be cancelled.