Listed in the official MCP registry

The signing layer for AI agents

Your agent drafts the contract, sends it to real signers, and tracks every view and signature through to completion. An MCP server, a REST API and a CLI. Legally binding, fully audit-logged.

Start free with 20 contractsConnect your agent
$ npx add-mcp https://apisign.io/mcp

$0.25 per contract after that · No monthly fee · No credit card to start

In the template editor, you ask Gilberto, the writing assistant, for a venue rental agreement. He drafts it in Markdown with variables, then reviews it and scores it 94 out of 100.

apisign.io/dashboard/templates/new

Works with Claude Code, Claude Desktop, Cursor and any MCP client that can send a header.

For developers

One URL. Twelve tools. Any agent.

Point an agent at the MCP server, sign in once, and it can find a template, fill it in and send it for signature in one conversation. Everything the tools do is also plain JSON over HTTPS, so your own code can do it too.

Templates

  • template_list
  • template_get
  • template_create
  • template_update
  • template_upload
  • template_archive

Contracts

  • contract_list
  • contract_get
  • contract_create
  • contract_update
  • contract_send
  • contract_cancel
MCP server docsAPI reference
# Claude: Settings > Connectors > Add custom connectorhttps://apisign.io/mcp # Claude Codeclaude mcp add --transport http apisign https://apisign.io/mcp # Cursor, VS Code, and other MCP clientsnpx add-mcp https://apisign.io/mcp # Sign in to APISign, pick an organization, approve.# No API key to create or paste. # Then just ask:# "Send the NDA template to jane@acme.com for signature"

The whole flow

Everything between the draft and the signature

The parts you would otherwise build yourself, already done and already logged.

Markdown templates

Write templates in Markdown with {{variables}} an agent fills in, or upload a .docx and get one back. Headings, lists, tables and images come along.

Templates

Write with Gilberto

Draft, edit and review templates by chatting. He scores a template out of 100 and points out what to fix. A second pair of eyes, not legal advice.

Writing assistant

Test mode

Flag a contract as a test and run the whole flow for free. The signing request comes to you, not your signer.

Signed webhooks

HMAC-signed notifications when a contract is sent, viewed, signed, completed or cancelled, with every delivery logged.

Webhooks

Audit log and seal

Every view and signature is recorded with IP address, device and timestamp, and the signed PDF carries a SHA-256 seal.

Your brand

Your logo, letterhead, colors and fonts on the signing page, the emails and the signed PDF.

Pricing

Priced for software that sends a lot of documents

An agent that sends contracts sends more of them than a person does, so per-seat pricing and monthly minimums stop making sense.

$0.25

per contract sent

A resend counts as a send. Test sends are free.

$0

monthly fee

No seats, no plans, no metered API tiers.

20

free contracts to start

No credit card. Add funds when you need them.

How that compares

Effective cost per contract on each provider's API plans

Full comparisons and sources
  • DocuSign$1.25 - $4.80Monthly: $50 - $480/mo
  • PandaDocNot publishedMonthly: $19 - $49/user/mo
  • Dropbox Sign$1.50 - $2.50Monthly: $75 - $250/mo
  • SignNow$1.20 - $2.00Monthly: $0
  • eSignatures$0.49Monthly: $0
  • Signaturely$0.32 - $0.98Monthly: $40 - $199/mo
  • APISignYou are here$0.25Monthly: $0

Competitor pricing checked October 2026. For plan-based providers the per-contract figure is the plan price divided by the envelopes it includes. Keep a card on file and APISign can reload your balance automatically when it runs low.

From the blog

Notes on documents and signatures

View all posts

Put your first contract in front of a real person today

20 free contracts to try it with your own agent. No credit card, no monthly fee.

Create a free accountRead the docs
  • Test mode is free
  • Set up in minutes
  • Cancel any time