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.
No credit card required. Upgrade anytime.
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.
A better way to sign.
$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.
True White-Label
Your domain. Your logo. Your emails. Your certificates. Your customers never see our name. Growth plan and above.
15-Minute Integration
REST API + OAuth 2.0 + embedded iframe. Install our SDK and ship e-signatures before lunch.
E-signatures across every industry.



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E-signatures in 10 lines of code.
// 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.Start free. Scale infinitely.
Free
5 envelopes/month
- API + OAuth access
- Basic audit trail
- Email notifications
- Community support
Starter
50 included, then $0.50/env
- Embedded signing (iframe)
- SHA-256 audit trail
- Certificate of completion
- Webhooks + HMAC signatures
- Email support (48hr SLA)
Most Popular
Growth
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)
Scale
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
Need more? Contact us for Enterprise pricing with unlimited envelopes and custom SLAs.
How we stack up.
| Feature | ClosingSignIQ | DocuSign | BoldSign | HelloSign |
|---|---|---|---|---|
| Embedded signing (iframe) | Yes | Yes | Yes | Yes |
| White-label by default | Yes | No | Yes | No |
| X.509 digital certificate | Yes | No | No | No |
| SHA-256 hash-chained audit trail | Yes | Yes | Yes | Yes |
| AI document scanning | Yes | No | No | No |
| Per-envelope cost | $0 included | $3-15 | $0.75 | $2-5 |
| Free tier | 5/month | No | No | No |
| Starting price | $0/month | $480/year | $30/month | $180/year |
| ESIGN + UETA + eIDAS | Yes | Yes | Yes | Yes |
| HMAC webhook signatures | Yes | Yes | No | Yes |
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.
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.