Documentation
DOCS.
Everything you need to understand, configure, and build on Lengdon.
01
Getting started
What is Lengdon?
The six-gate close infrastructure platform explained.
Creating your account
Founder vs investor accounts, and what changes.
Your first transaction room
Step-by-step: room setup, party invitation, and gate 1.
Understanding the six-gate sequence
What each gate requires and why the order matters.
02
Transaction rooms
Room types and use cases
Equity rounds, SAFEs, SPVs, M&A, secondary transfers.
Inviting parties and observers
Principal vs observer access. How per-person NDAs work.
Document management by gate
Which documents attach to which gates and why.
Condition management
Defining and confirming condition precedents within a room.
03
Gate sequence
Gate 1: Counsel
Legal review confirmation by both parties.
Gate 2: Agreement
Term acceptance and document execution.
Gate 3: Conditions
Condition precedent satisfaction and verification.
Gate 4: Signing
Formal execution of transaction documents.
Gate 5: Payment
Capital transfer confirmation and verification.
Gate 6: Close
Final confirmation, seal, and dual export.
04
Audit & records
How the audit log works
Append-only, tamper-evident. What that means.
The sealed close export
What's in it, how to read it, how to store it.
Registry verification
Verifying your export against the registry reference.
Legal defensibility
How Lengdon records are used in disputes and audits.
05
Security
Encryption at rest and in transit
What is encrypted, how, and with what keys.
Per-person NDA enforcement
How individual NDAs bind access in practice.
Access control and permissions
Gate-scoped access. Who can see what and when.
Data residency and retention
Where your data lives and how long it is retained.
06
API & integrations
API overview
REST API for room creation, gate management, and record retrieval.
Webhooks
Real-time events for gate confirmations and close events.
Authentication
API keys, OAuth, and token scoping.
Rate limits and quotas
Request limits by plan tier.
Quick start
New to Lengdon?
Create an account and open your first transaction room in under 10 minutes.
Create account →For developers
API integration
REST API, webhooks, and SDKs for embedding Lengdon's close infrastructure in your product.
Request API access →