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ClosingSignIQ API

E-Signatures for Your App.
Not DocuSign’s.

Add legally binding e-signatures to any application in 15 minutes. ESIGN Act + UETA + eIDAS compliant. White-label from day one. 80% less than DocuSign. Built on open source.

Start Free — 5 Envelopes/MonthView API Docs

No credit card required. Upgrade anytime.

The Problem

The e-signature tax on every SaaS company.

Per-user pricing kills margins

DocuSign charges $40-60/user/month. At 50 users, that's $3,000/month just for signatures. Your costs grow faster than your revenue.

Their brand in YOUR product

"Powered by DocuSign" undermines your brand. Your customers should see YOUR name on every certificate of completion, not a vendor's.

Per-envelope fees scale against you

BoldSign charges $0.75/envelope. At 1,000 envelopes, that's $750/month on top of their base fee. Every new customer costs you more.

The Solution

A better way to sign.

0

$0 Per-Envelope Cost

Built on open-source libraries (pdf-lib, node-forge). No per-envelope infrastructure fees. Your margins stay fat as you scale.

W

True White-Label

Your domain. Your logo. Your emails. Your certificates. Your customers never see our name. Growth plan and above.

15

15-Minute Integration

REST API + OAuth 2.0 + embedded iframe. Install our SDK and ship e-signatures before lunch.

See It In Action

E-signatures across every industry.

Real estate agent with hard hat standing by a modern house for sale.
Photo by Pavel Danilyuk on Pexels
A gavel striking a sound block, symbolizing justice and legal authority in a courtroom setting.
Photo by KATRIN BOLOVTSOVA on Pexels
A close-up image showing a doctor holding a stethoscope, symbolizing healthcare and medical practice.
Photo by Felipe Queiroz on Pexels

Video by Kampus Production on Pexels

Ship Fast

E-signatures in 10 lines of code.

app/api/send-contract/route.ts
// Create and send an envelope via ClosingSignIQ API
const response = await fetch('https://closingiq.app/api/v1/signing/envelopes', {
  method: 'POST',
  headers: {
    'X-API-KEY': process.env.CLOSINGSIGNIQ_KEY,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    title: 'Service Agreement',
    signers: [
      { name: 'John Smith', email: '[email protected]' },
      { name: 'Jane Doe', email: '[email protected]' },
    ],
    signing_order: 'SEQUENTIAL',
  }),
});

const { id, signers } = await response.json();
// Signers receive an email with a unique signing link.
// Or use the embedded signing URL in an iframe.
Pricing

Start free. Scale infinitely.

Free

$0/forever

5 envelopes/month

  • API + OAuth access
  • Basic audit trail
  • Email notifications
  • Community support
Start Free

Starter

$29/month

50 included, then $0.50/env

  • Embedded signing (iframe)
  • SHA-256 audit trail
  • Certificate of completion
  • Webhooks + HMAC signatures
  • Email support (48hr SLA)
Get Started

Most Popular

Growth

$79/month

250 included, then $0.35/env

  • Everything in Starter
  • White-label signing
  • X.509 digital certificate
  • Sequential + parallel workflows
  • SMS notifications
  • Priority support (24hr SLA)
Start Growing

Scale

$199/month

1,000 included, then $0.25/env

  • Everything in Growth
  • Full white-label (your domain)
  • Template library API
  • Advanced fields (formulas)
  • Phone support (4hr SLA)
  • 99.9% uptime SLA
Scale Up

Need more? Contact us for Enterprise pricing with unlimited envelopes and custom SLAs.

Comparison

How we stack up.

FeatureClosingSignIQDocuSignBoldSignHelloSign
Embedded signing (iframe)YesYesYesYes
White-label by defaultYesNoYesNo
X.509 digital certificateYesNoNoNo
SHA-256 hash-chained audit trailYesYesYesYes
AI document scanningYesNoNoNo
Per-envelope cost$0 included$3-15$0.75$2-5
Free tier5/monthNoNoNo
Starting price$0/month$480/year$30/month$180/year
ESIGN + UETA + eIDASYesYesYesYes
HMAC webhook signaturesYesYesNoYes
Compliance

Legally binding. Globally recognized.

ESIGN Act

15 USC §7001 — US federal law. Electronic signatures have the same legal standing as wet-ink signatures.

UETA

Uniform Electronic Transactions Act. Adopted by 49 states + DC. Covers all electronic records and signatures.

eIDAS

EU Regulation 910/2014. Qualified electronic signatures recognized across all 27 EU member states.

SHA-256 Audit Trail

Every action is timestamped, IP-logged, and cryptographically chained. Tamper-evident by design.

X.509 Digital Certificate

Azure Certificate Authority. Each signed document gets a unique certificate traceable to our root CA.

Certificate of Completion

Downloadable PDF appended to every signed document. Full event history, IPs, timestamps, document hash.

Use Cases

Built for builders.

SaaS Platforms

Add e-signatures to your CRM, HRMS, or property management tool. Embedded signing keeps users in your app. White-label means your brand.

Marketplaces

Let sellers and buyers sign agreements without leaving your platform. Sequential or parallel workflows for multi-party deals.

Legal & Compliance

X.509 certificates and hash-chained audit trails meet the strictest requirements. HIPAA, SOC 2, and GDPR ready.

Stop paying rent on signatures.

Start free. No credit card required. Ship e-signatures in your app today.
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