月下の契約
AGENT-FIRST · MCP-NATIVE · LEGALLY BINDING

Agents run the paperwork.
You keep control.

Beautiful contracts, generated on the fly to match each customer exactly. Agents run them end to end. Your customers sign. You stay in control.

INSTALL FROM CLAUDE — ONE CLICKSEE HOW
THE SHIFT

Manual contracts are slow. Deals aren't.

Contracts used to be edited by hand: slow, rigid, one at a time. LetSign generates beautiful contracts on the fly, matched to each customer's exact needs, at any scale.

BEFORE
Manual edits. Slow, inflexible, one contract at a time.
WITH LETSIGN
Beautiful contracts generated on the fly, matched to the customer, at scale.
THE BRIDGE BETWEEN HUMANS AND AGENTS
橋渡し
HOW IT WORKS

End to end, no one in the loop, and you above it.

Agents never sign. They orchestrate. Your customer signs; you supervise from the app.

01
Generate
The agent drafts the right contract, matched to the deal, the style, the template.
02
Update
Terms, pricing and clauses change in real time as the deal evolves.
03
Track
Every open, view and signature is tracked. The agent follows up on its own.
04
Collect
Subscriptions set up, payments collected, inside the same flow.
05
Sign
Your customer signs. Legally. Agents never do. They orchestrate.
USE CASES

Three ways agents already contract with LetSign.

01 · PROPOSAL-MATCHED CONTRACTS

The contract looks exactly like the proposal. Because it came from it.

Claude writes the proposal, then attaches a contract in the same style, same content. Your customer never looks twice.

PROPOSAL
CONTRACT · SAME STYLE
Amara K.
E-SIGNED
CHOOSE YOUR TERMS
UPDATED 12s AGO BY AGENT
MONTHLY
cancel anytime
ANNUAL
selected by customer
PILOT
8 weeks, fixed
02 · LIVE NEGOTIATION

Terms move as the conversation moves.

The agent adjusts terms and options in real time as the negotiation evolves. Conditional pricing tables let the customer pick their own deal.

03 · AUTOMATION AT SCALE

Thousands of contracts. Zero humans in the loop.

A quote becomes a signed job with payment collected automatically, at any volume. You see the ledger.

04:12 AM
Quote → signed job · Fencing, Dulwich Hill
$3,140.00
PAID
04:12 AM
Retainer renewal · Studio Ando
$2,400.00/mo
SIGNED
04:13 AM
Quote → signed job · Rewire, Marrickville
$1,860.00
PAID
04:15 AM
SOW amendment · Kite & Co
·
COUNTERSIGNED
TODAY1,284 SIGNED · $412,806 COLLECTED
THE LETSIGN THESIS
“A contract should fit the deal it closes. Not the template it came from.”
筆は人の手に
TRUST & LEGALITY

Binding where it matters. Auditable everywhere.

Enforceable across Western jurisdictions. Agents orchestrate. The signature is always human.

Email verification
Every signer is verified before the pen touches paper.
E-signature
Signatures compliant with ESIGN, eIDAS and equivalents.
Full audit trail
Every generation, edit and view, timestamped and immutable.
Western jurisdictions
Enforceable across the US, EU, UK, Canada and Australia.
FLEXIBILITY

Bends to the deal. Never the other way.

Built to disappear into whatever your agent is doing: a proposal, a negotiation, ten thousand quotes.

Manageable templates
Curate the templates your agents draw from. Change once, apply everywhere.
Conditional pricing
Offer pricing tables the recipient picks from, inside the contract itself.
Style-matching
Contracts inherit the exact look of whatever the agent just produced.
MCP-native
A first-class MCP server. One-click install from Claude or Codex.
夜明け

Let the agents work the night.

One click from Claude or Codex, and LetSign slots into your agentic flows. Contracts by morning.

INSTALL FROM CLAUDEINSTALL FROM CODEX